Aug 17, 2023 · To put the new design into production, Ford spent big. "Ford Motor Company will release this fall a brand new $100-million engine designed for the 1970s," read an August 15, 1969, press release ... The 351M/400 uses a whole different motor mount system and a big block bell. The deck is also tall - 302 has a 8.2 deck, 351W 9.5", 351C 9.2", 351M/400/429/460 10.3". the taller deck puts headers up and out 3/4 ~ 1" and that may preclude using 351C type headers, depending on how they are made and fit the chassis.Setting up a new Android phone means you’ll be spending more than a few minutes in the Google Play Store, downloading apps. It also means you’ll be dealing with more than a few ann...Some later blocks also allow for the use of roller cams instead of flat tappet. Do you know the difference between a 351w, a 351 Cleveland, a 351 Modified, or a 351 HO? In the battle of 351 Windsor Vs 351 Cleveland, why should you pick the Windsor even though the Cleveland is a more powerful engine? This video goes into all that and even more.Yes, when you go to replace the timing set, buy CLOYES (SUMMIT) for a pre-1973 351C and it will advance the cam timing. Of course the cam in that engine isn't much. The CLOYES is available single or double roller. Single OEM replacement is all you need. -TECH ARTICLE ON DURASPARK II DISTRIBUTOR RECURVE-. 351 Modified Stands On Its Own The final example of the 351 lineup is known as the 351M -- standing for "Modified" or "Michigan," depending on who you ask. Ford never issued an official clarification. 9317 posts · Joined 2005. #2 · Jul 16, 2006. 351M's are a variant of the Clevelands some stuff for the clevlands work but there is not much of an aftermarket for the Modefieds. maby an intake manifold and headders, that will net a little. your engine is probably rated at 200 RWHP, putting it at just over 250 or so at the flywheel. don't cam ...FORD 5.8L/351 Ford Modified Exhaust Manifolds. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 4 of 4 25 Records Per Page Default Sort . Dorman Exhaust Manifolds 674-182. Dorman Exhaust Manifolds 674-182 ...FORD 5.8L/351 Timing Covers. Filter by Availability Filter Results Filter by Vehicle Individual Parts. Part Groups. Results 1 - 21 of 21 25 Records Per Page Default Sort . Ford Performance Parts Timing Chain Covers M-6059-D351. Ford Performance Parts Timing Chain Covers M-6059-D351 ...by John Thompson. October 13, 2023. The 351 cleveland can be identified by its taller deck height and larger intake ports. This engine was produced by ford from 1969 to 1974 and is known for its performance capabilities and durability. Introduced by ford in 1969, the 351 cleveland is a high-performance engine that was produced until 1974. Sanderson Headers Blockhugger Headers FC1-SEC. Headers, Block Hugger, Steel, Silver Ceramic Coated, 3.0 in. Collector, Ford, Pair. Estimated Ship Date: Jul 22, 2024 if ordered today. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Headers and get Free Shipping on Orders Over $109 at Summit Racing! Max. HP: 400-450. Approx. Price: $1,000.00. Comments: Like the Long-Rod 302 mentioned earlier in this book, the 351 Long-Arm kit uses a longer than stock connecting rod, which allows the piston to dwell longer at the top and bottom of the bore. This allows us to make the most of the fuel/air charge.History of the Ford 400 Engine. The Ford 400 was introduced along with the 351 Modified in 1971. The 400 was used in many applications over the years. The 400 replaced the Ford 390, and it was designed for good acceleration for medium to heavy vehicles. The 400 is basically a stroked 351 – it had the longest stroke in pushrod engines at the ...ATK High Performance Ford 351W 300 HP Stage 1 Long Block Crate Engines HP09. Engine Assembly, Stage 1 Crate Engine, Long Block, 1-Piece Main Seal, Ford, Small Block Windsor, 351, Each. Part Number:HPE-HP09. ( 5 ) …🛠️ Download our free guide: The tools you need to work on your Mustang! https://bit.ly/465MGQT Ford has offered a 351 cubic inch engine in several different...Trump administration policymakers built a major loophole into the new role for food companies to jump through. Two bottles of soybean oil sit on a grocery store shelf. Both contain...Upgraded 351 Cleveland Carburetor. Best 351 Cleveland Carburetor Recommendation: Holley HP 650-cfm Carburetor. It is widely concluded that the 351 Cleveland as an engine series lacked any serious performance carburetor options. The low-compression 2V 351 Clevelands came with Autolite/Motorcraft 2100/2150 2-barrel carburetors.Jun 1, 2006 · Ford's 351 Cleveland is legendary for the performance it has given us for 36 years. However, we admit to being confused by Ford's decision to manufacture the 351C . It already had the 351W, a ... The aftermarket is enormous for the windsor as pretty much everything for the 5.0L will work with the exception of brackets, intake, blah, blah blah. The 351M on the other hand, is merely a 400 with stunted growth issues. They made the 400 first, and then destroked it for the 351M to be used in more cars.MSD Iridium Spark Plugs 3744. Spark Plug, 16IR5Y, Iridium Core, Tapered Seat, 18mm Thread, 0.437 in. Reach, Projected Tip, Resistor, Each. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing!Yes, when you go to replace the timing set, buy CLOYES (SUMMIT) for a pre-1973 351C and it will advance the cam timing. Of course the cam in that engine isn't much. The CLOYES is available single or double roller. Single OEM replacement is all you need. -TECH ARTICLE ON DURASPARK II DISTRIBUTOR RECURVE-.from Wisconsin. The 351M/400 were poor performers in stock trim, with restrictive intakes and poor cam timing, but there is no reason that can't be fixed with a rebuild. The stock 2 barrel heads are fine for a mild engine, although the open chambers are prone to detonation. 4 barrel heads can be adapted.2bbl. Cleveland heads bolt up without any changes. 4bbl. heads will require a set of spacers to run the 4bbl manifold,or you can have an aluminum intake for the 351M/400 welded up at the port area so they can be opened to the larger size. The wristpins on a 351M/400 are larger than the 351C and the comp.height is different , so …For example, there are at least three common 351 ci engine variants to know — the 351 Windsor, 351 Cleveland and 351 Modified. And when you think you have all those figured out, they throw the wild card at you, the 351 Clevor, essentially a Windsor block with 351 Cleveland cylinder heads. While building a Clevor engine isn’t exactly an …This MABBCO® Remanufactured Premium Long Block is for a Ford 5.8 351M motor, model years 1972-1982. This engine is commonly known as a "Modified." Each MABBCO® long block is custom assembled as ordered so please call for current build times. MABBCO® long blocks include NEW pistons, piston rings, rod bearings, main bearings, cam bearings ... Quickfuel carb and MSD distributor. Polished aluminum valve covers. Complete and dyno tuned. Minimum cost Level 1 $11700 parts, machined block and assembled heads. Minimum cost Level 2 $12500 parts, machined and assembled short block, assembled heads. Minimum cost Level 3 $16400 Complete dyno tuned engine. Example engine. Intake Combo, Weiand Action Plus, Ford, Modified, 351/400, Bolts, Gaskets, RTV Sealer, Carburetor Studs, Kit. Part Number: CMB-03-0122 4.5 out of 5 starsThe aftermarket is enormous for the windsor as pretty much everything for the 5.0L will work with the exception of brackets, intake, blah, blah blah. The 351M on the other hand, is merely a 400 with stunted growth issues. They made the 400 first, and then destroked it for the 351M to be used in more cars.The new 351, nicknamed the Cleveland after Ford's Engine Plant Number 2, where it was produced, was yet another completely new engine from a completely new …The 400M was first introduced in the 1971 Full-size model cars and station wagons. It was developed as an economical, reduced emissions replacement for the larger, gas-guzzling 429/460 and the ageing 360/390/428 V8 engines. The 351M was developed in 1975 to replace the 351C for use in large passenger cars. The 351M/400 engines were used in ...Buy MAS Ignition Distributor w/Cap & Rotor Compatible with Ford 351C 351M 400 429 460 HEI 65,000 Volt Coil KA-1046013 PE332U JM6506BL 351CBLHEI0: Distributors - Amazon.com FREE DELIVERY possible on eligible purchasesMax. HP: 400-450. Approx. Price: $1,000.00. Comments: Like the Long-Rod 302 mentioned earlier in this book, the 351 Long-Arm kit uses a longer than stock connecting rod, which allows the piston to dwell longer at the top and bottom of the bore. This allows us to make the most of the fuel/air charge.351-C or "Cleveland" made from 1970 -1974. This was the "premier" Mustang/Cougar high performance mill (used in other Ford cars too). It was made in 2bbl, 4bbl, "Boss", and CJ (Cobra Jet) styles each having its on unique head tuning. The C is known for being more Horsepower oriented than torque oriented.The 351M was a simple de-stroked adaptation of the 400, and it allowed Ford to offer both 351 cid and 400 cid engines with fewer different parts and more common packaging than the 351C allowed. Since the 351M and 400 use the same block, the engine mounts and bell housing bolt patterns are common to the two engines.The 1971 and 1972 M-block 400 makes a good example to compare gross (260hp) and net (172hp) power ratings. There was no significant change in the 400’s specification …Fill out a custom engine quote form and we will get a kit priced for you. All kits consist of assembled heads, intake manifold and camshaft. Horsepower 370 Torque 420 351cid. Horsepower 420 Torque 460 400cid. Runs on 93 octane with medium aggressive camshaft. Your provided OEM Iron cores heads mild ported. Custom speced camshaft.The 400M was first introduced in the 1971 Full-size model cars and station wagons. It was developed as an economical, reduced emissions replacement for the larger, gas-guzzling 429/460 and the ageing 360/390/428 V8 engines. The 351M was developed in 1975 to replace the 351C for use in large passenger cars. The 351M/400 engines were used in ...Some later blocks also allow for the use of roller cams instead of flat tappet. Do you know the difference between a 351w, a 351 Cleveland, a 351 Modified, or a 351 HO? In the battle of 351 Windsor Vs 351 Cleveland, why should you pick the Windsor even though the Cleveland is a more powerful engine? This video goes into all that and even more.Jun 8, 2005 · Jun 8, 2005. #5. 351 W has larger bearing journals and smaller ports making it a better truck engine and more emissions friendly than the 351 C. The 351C was an excellent performance engine whereas the 351W was better suited to station wagons and trucks. The 351C was used in Australia (go figure) after it was discontinued in the US in 1973. 🛠️ Download our free guide: The tools you need to work on your Mustang! https://bit.ly/465MGQT Ford has offered a 351 cubic inch engine in several different...Find FORD 5.8L/351 Ford Modified Headers and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App ... Headers, Clippster, Mid-Length, Steel, Natural, Ford Cleveland, Modified, Each. Part Number: PTE-H8435. 4.25 out of 5 stars. Estimated Ship Date: Today. Free Shipping...Loading Estimated Ship Date: Today. Free ...351M/400M. The heads on these engines are identical to the old Cleveland 2 bbl head and are interchangeable. The major downfall of the M block as was with the Cleveland was the indiscriminate oiling system. A simple cure for this is to get a hand ful of 3/8th inch, 2 inch long and 3/16th inch, 1 inch roll pins.The 351 Windsor was available from 1969-97, making it by far the most common engine of the trio. As a final historical footnote, the introduction of the overhead-cam Ford Modular V8 in 1991 meant that the Windsor, Cleveland, and Modified engines represent the final pushrod V8s designed by Ford.The BoxWrench Engine Specs Database is a community resource for mechanics of all skill levels to access a reference library of Firing Orders, Distributor Rotation Directions and Block-Cylinder Numbering as well as Torque Specs, Timing Settings and Cylinder Head Tightening Sequences among other engine specs.The 351 Windsor has a displacement of 351 cubic inches or 5.8 liters. The stock stroke of the engine is 3.5 inches and the stock cylinder bore is 4 inches. It has a distinct firing order from the other Ford Small Blocks, 1-3-7-2-6-5-4-8 vs 1-5-4-2-6-3-7-8. Cast out of iron, the bare block weighs in at between 150 – 200 lbs depending on the year.9.500'' 1977-79 351M-400M. Motor Vehicles . WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm.Cometic Oil Pan Gaskets C5278-075. AFM 351 C/BOSS351/351M. Part Number: CGT-C5278-075. Not Yet Reviewed. Estimated Ship Date: Jun 12, 2024 if ordered today. Special Order.Demonstrating that the stock 4V heads had much more power to offer, the cam and intake upgrade increased the power output by nearly 100 horsepower, pushing the peaks to 452 horsepower and 412 ft.-lbs. of torque. Given the flow rates, even this modified 351C was just scratching the surface of what OG 4V heads will support!Find FORD 5.8L/351 Ford Modified Head Gaskets and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... 0.060 in. Thickness, Rubber Coated Copper, Ford, Boss, Cleveland, Modified, Pair. Part Number: FOG-905564060. 5.0 out of 5 stars. Estimated Ship Date: …Ford 351. Ford 351 may refer to: Ford 351 Windsor (351W), an engine part of the Ford 90 degree V family. Ford 351 Cleveland (351C), an engine part of the Ford 335 family. Ford 351 M (351M), an engine part of the Ford 335 family. Category: Disambiguation pages.Find FORD 5.8L/351 Ford Modified Flywheels V8 Engine Type and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App Vehicle/Engine Search Vehicle/Engine Search Make/Model SearchFind FORD 5.8L/351 Ford Modified Pistons and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App.VALVE COVER GASKET for FORD 351 CLEVELAND, 351 Modified and 400 CID. Part # RG-50068FR. Set of two "Ultimate" silicone gaskets. "Ultimate" silicone gaskets are where a layer of fiberglass is centered between 2 layers of silicone. This is a super strong gasket. It is reusable. Made in the USA.The Ford 351 V8 Came In Cleveland, Windsor, and Michigan (Modified) Flavors. August 31, 2021. Story By. Benjamin Hunting. There are few engine families as …by John Thompson. October 13, 2023. The 351 cleveland can be identified by its taller deck height and larger intake ports. This engine was produced by ford from 1969 to 1974 and is known for its performance capabilities and durability. Introduced by ford in 1969, the 351 cleveland is a high-performance engine that was produced until 1974.Nov 20, 2014 · Build A 505HP Ford 351 Windsor. John McGann Writer Brian Hafliger Photographer Nov 20, 2014. See All 17 Photos. It's safe to say we've built a few 350 Chevys in the pages of Car Craft. Let's spare ... Quickfuel carb and MSD distributor. Polished aluminum valve covers. Complete and dyno tuned. Minimum cost Level 1 $11700 parts, machined block and assembled heads. Minimum cost Level 2 $12500 parts, machined and assembled short block, assembled heads. Minimum cost Level 3 $16400 Complete dyno tuned engine. Example engine. In 1976 a minor modification was made to the main webbings to strenghten them. The 351M was introduced in 1975 after the Cleveland was discontinued and uses the same block and heads as the 400, the only difference is the shorter stroke crankshaft and taller pistons. Last edited by Bill_Beyer; 05-30-2003 at 01:56 PM.ATK High Performance Ford 351W 385 HP Stage 1 Long Block Crate Engines HP11. Engine Assembly, Stage 1 Crate Engine, Long Block, 1-Piece Main Seal, Ford, Small Block Windsor, 351, Each. Part Number: HPE-HP11. ( 2 ) Estimated Ship Date: Aug 15, 2024 if …Sanderson Headers Blockhugger Headers FC1-SEC. Headers, Block Hugger, Steel, Silver Ceramic Coated, 3.0 in. Collector, Ford, Pair. Estimated Ship Date: Jul 22, 2024 if ordered today. Jumpstart Your Next Project! Find FORD 5.8L/351 Ford Modified Headers and get Free Shipping on Orders Over $109 at Summit Racing!If a 351, the VIN will only decode to a 351M .. because the 351W wasn't available in F150/350 & Bronco until 1981. Not available in any year F100. 351M/400 have 8 valve cover bolts per side. There is no timing cover per se, just a flat engine cover plate. The fuel pump bolts to the left (drivers) side of the block, its bolt pattern is at 6 & 12 ...Build A 505HP Ford 351 Windsor. John McGann Writer Brian Hafliger Photographer Nov 20, 2014. See All 17 Photos. It's safe to say we've built a few 350 Chevys in the pages of Car Craft. Let's spare ...Investopedia describes a modified Dutch auction as a sales technique for selling stock shares where the purchase bid starts high and gradually drops until enough bids are placed to...MSD distributor. Fully tested and dynoed. Minimum cost Level 1 $20400 parts, machined block and assembled heads. Minimum cost Level 2 $21200 parts, machined and assembled short block, assembled heads. Minimum cost Level 3 $26600 complete dyno tuned engine. Supercharger engines available. Max. HP: 400-450. Approx. Price: $1,000.00. Comments: Like the Long-Rod 302 mentioned earlier in this book, the 351 Long-Arm kit uses a longer than stock connecting rod, which allows the piston to dwell longer at the top and bottom of the bore. This allows us to make the most of the fuel/air charge. Ford's 351 V8 is a muscle-car masterpiece, but did you know it came in three flavors? Here's the story behind the 351 Cleveland, Windsor, and Modified engines.Apr 10, 2008 ... A Moroso front-sump pan holds the Pure Power synthetic oil that Bob likes to run. The Melling M-Select pump runs that oil through a Pure Power ...Oct 25, 2019 · The 351 Windsor was available from 1969-97, making it by far the most common engine of the trio. As a final historical footnote, the introduction of the overhead-cam Ford Modular V8 in 1991 meant that the Windsor, Cleveland, and Modified engines represent the final pushrod V8s designed by Ford. With the heads and camshaft chosen, we're looking at two options in particular for our 351 Windsor build-the Trick Flow R-series intake manifold, and the Edelbrock Victor 5.8 intake manifold. The ...This has the added advantage of lowering the power curve on the 4V heads. Instead of peaking at say 7,000 RPM, now the engine will peak out at 6,500 RPM. Also with minimal prep on the bottom end with a stock crank and rods are safe to rev to 6,000. Here are a series of articles on the 351/400 series of engines.The 351 Windsor is a very popular engine today in Cobra replicas, and is often punched out to 427 ci and above. At a glance, the 351 Windsor engine can be identified by its six-bolt valve covers and radiator … Object moved to here. NEW MERCH is now available. See link below....In today's video we begin assembly of the 351M V8 Motor. All peripheral parts are painted and ready for reass...Howards Cams Street Force 1 Hydraulic Flat Tappet Camshaft and lifter Kits CL230011-12. Cam and Lifters, Street Force 1, Hydraulic Flat Tappet, Advertised Duration 259/269, Lift .484/.514, Ford, 351C, 351M,400, Kit. Part Number: HRS-CL230011-12.The firing order for a Ford 351 Windsor is 1-3-5-7-2-6-5-4-8, which differs from most other V-8 engines the company manufactures. Ford numbers its cylinders beginning at the front ...1973 - 1979 F-100 & Larger F-Series Trucks - 351m rear main seal. - Well by the drips a guy could think my trucks afraid of being lost and leaving a trail small drips where it goes. Can someone walk me threw changing the rear main seal on my 351M (mated to a np435) as i've never had to do one before. Also pictures...Find FORD 5.8L/351 Ford Modified Engines & Components and get Free Shipping on Orders Over $109 at Summit Racing! ... 62cc Chamber, 1.55" Spring, Ford, Cleveland ...Find FORD 5.8L/351 Ford Modified Starters and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App ... Modified/Big Block, 385 Series, 3/4 Offset, 2 3/8 in. Nose Housing Length, Each. Part Number: SUM-820048. 4.47 out of 5 stars. Estimated Ship Date: Tomorrow. Free Shipping...Loading Estimated Ship Date ...Find FORD 5.8L/351 Ford Modified Starters and get Free Shipping on Orders Over $109 at Summit Racing! ... Starter, Mini, 1.9 HP, Ford, Modified/Big Block, 385 Series ...The 351-4V: M Code. When Ford began to advertise the “new” 351-4V for 1970, this was the engine it was writing about. ... Most agree the “M” was for modified, but some claim it was “Michigan” or “Midland.” Ford never said what it meant officially. Of note, the 400 Ford has no designation, despite the commonly misused 400M ...DESCRIPTION: Edelbrock Performer intake manifolds are designed for street-performance Ford 351-M/400 engines operating in the idle-5500 rpm range. Edelbrock Performer manifolds are designed to replace the stock manifold and to accept stock parts in most cases, as long the OEM or a recommended carburetor is retained, making an Edelbrock …Quickfuel carb and MSD distributor. Polished aluminum valve covers. Complete and dyno tuned. Minimum cost Level 1 $11700 parts, machined block and assembled heads. Minimum cost Level 2 $12500 parts, machined and assembled short block, assembled heads. Minimum cost Level 3 $16400 Complete dyno tuned engine. Example engine.
9317 posts · Joined 2005. #2 · Jul 16, 2006. 351M's are a variant of the Clevelands some stuff for the clevlands work but there is not much of an aftermarket for the Modefieds. maby an intake manifold and headders, that will net a little. your engine is probably rated at 200 RWHP, putting it at just over 250 or so at the flywheel. don't cam .... Shea 14 scottsdale
351 C heads can be made to fit a windsor but ver expensive. Ports are large and great for upper rpm horsepower but not too great for making torque. ... The 351M is a 351 modified 400. cleveland engine that has a 400 crank in it from the factory. A torque monger for the big 3/4 ton vans and pick ups. It has all the power at the lower rpm range.The Ford 400 Modified Long Block includes: Advertised power- 375hp / 450tq. Reman 335 Block. 4 coats of high quality ceramic engine paint. We have our engines professionally sprayed with a 2 part paint just like you would use on a car but a special high temp version. This is not a cheap “rattle can” paint job that will wear off.Learn the differences between the Ford 351 Windsor, Cleveland, and Modified engines, based on displacement, cylinder heads, crankshaft, and bolt pattern. See visual cues and performance characteristics of each engine type. See moreFind FORD 5.8L/351 Ford Modified Intake Manifolds, Carbureted and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... Aluminum, Natural, 4-Barrel, Square Bore, Ford, Modified, 2V, Each. Part Number: EDL-2171. 4.72 out of 5 stars. Estimated Ship Date: …At the end of the 1960s Ford was seeking a way to increase the torque produced by its 302 cubic inch V8 without having to spend a lot of money developing a new engine. The answer was to increase the stroke and bump displacement by nearly 50 cubes, giving the 351 the first part of its name. The second—Windsor, or 'W'—referred to the Ontario ...Despite their identical displacements, the 351s are not the same engine. Yet, each engine served its purpose, helping power Ford to new heights during difficult times. …Dec 4, 2009 · The 351M, as it was known, was the only 351 option until 1980, when the 351 Windsor was introduced. The 1980 351cubic inch engines both offered 136 horsepower until 1983 when the 351M was phased out and the 351 Windsor got an increase to 150 horsepower. A year later, the 351 high output (W HO) was offered and with 210 horsepower it was the most ... Trick Flow® PowerPort® Cleveland 195 Cylinder Heads for Ford 351C, 351M/400 and Clevor TFS-51616204-C00. Cylinder Head, PowerPort® Cleveland 195, CNC Street Ported, Assy, 62cc Chamber, 1.55" Spring, Ford, Cleveland, Modified, Each. Part Number: TFS-51616204-C00. ( 8 ) Estimated Ship Date: Today.Object moved to here.This MABBCO® Master Engine Kit is for a Ford 351M 5.8 Modified motor, model years 1975 through 1982. Each kit is custom assembled using parts based on your engine’s requirements. Accordingly, we need to know the following: (1) model & year, (2) piston & ring size, and (3) rod & main bearing size. Have questions on parts or sizes, just give ...Ford's 351 Cleveland is legendary for the performance it has given us for 36 years. However, we admit to being confused by Ford's decision to manufacture the 351C . It already had the 351W, a ...This has the added advantage of lowering the power curve on the 4V heads. Instead of peaking at say 7,000 RPM, now the engine will peak out at 6,500 RPM. Also with minimal prep on the bottom end with a stock crank and rods are safe to rev to 6,000. Here are a series of articles on the 351/400 series of engines..