Look up advertised power ratings, and dimensions and torque specs for Ford M-block (351M/400) engine components.

Aug 2, 2004 · High Performance Options for the 351M/400 Engine. From 1977 to 1982, M-block (351M/400) engines were a mainstay of Ford light truck powerplants. During this period, the M-block 400 was the largest V8 available from the factory in a 4×4 truck (Bronco or pickup). The 460 was not a factory option in 4×4 pickups until 1983.

Jan 5, 2013 · Look at the chevy small block crate engines that are in that 350-400 CID range and iron headed, see what they are running for compression, valve size, cam specs, and see how close that gets you.

Dec 3, 2018 · Performance, mileage, and drivability will be much better with a good modern carburetor and intake manifold. I personally would never replace a Motorcraft with another Motorcraft. If I was forced to keep the factory intake manifold, I'd install a 500 CFM Holley 2 …

There are four basic factors with the 351M/400 that need to be addressed to accomplish a true high performance buildup. They are: By far, the best thing you can do to your engine is to raise the compression ratio. All of the 351M/400s came with 8.0 to 8.4 to 1 compression ratios (except for the 1971 400, which had a 9.1:1 CR).

Your 78 or 79 "M" block should be just fine unless you have a very early model 78 Bronco made in 1977 or you are working with an older 351M/400. In this case, you should check your engine casting code to make sure it is okay.

Ford decided to continue to use the 351M as the standard engine in the F-150, 250, and 350 4x4 trucks and to use it as the standard engine in the new Bronco.

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.

Nov 7, 2019 · I did manage to find a vacuum diagram for the 400 dated for June 78, which was about a month before my car was built (as well as a couple 351M diagrams dated well after my car was built).

Apr 23, 2022 · Our Ford 5.8 liter 351 Windsor Long Block Engine is for Sale. Not a rebuilt 351W Crate Engine, this motor is completely remanufactured with upgraded parts. Got my 351m for my 78 Bronco from Gearhead Engines. Spoke with Thomas Conley. Engine was delivered super fast. They also picked up my old one. It’s been 6 years and still runs great.