Hi

I set of Ford factory Cleveland 4 bolt main caps set only

they are in excellent condition

prevent main cap walk and strengthen the bottom end of your cleveland
price $300-oo

will freight Australia wide and New Zealand at buyers cost

cheers

 

 

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351 Cleveland Engine








351 Cleveland History (short)

The 351 Cleveland (351C) is not related to the earlier 351 Windsor, except in cubic inches. This designation is important to avoid any form of confusion. The 351C came on the scene with 1970 model introduction topped with either 2V or 4V induction. The most important difference was the heads. Two barrel heads used "open" combustion chambers, whereas 4V heads had smaller "quench" heads to achieve a higher compression ratio. Four barrel heads also had larger valves and ports, and as you might expect, a bit hotter hydraulic cam to handle the extra breathing capability. Both of these engines were also available in 1971 models, basically unchanged. The BOSS 351 with a solid lifter cam was introduced with the 1971 models. At mid-year (May 1971), the 351C Cobra Jet (351CJ) appeared.

'71 4V/CJ Comparison Summary

The CJ hydraulic cam has more duration and overlap than the 4V. CJ blocks also feature 4-bolt main caps. CJ heads use the "open" 2V combustion chamber design, but retain the larger valves and ports of the 4V head. 4V engines used a model 4300-A Autolite carb with a standard Holley/Autolite manifold bolt pattern. CJ engines, however use a model 4300-D Autolite carb. The "D" model carburetor features small primaries and large secondaries ... and most importantly ... a larger "spread bore " manifold bolt pattern.

'72 4V/CJ Comparison Summary

In 1972, 4V and CJ engines are identical. 1971-72 CJ engines are basically the same, except for a 4-degree retard in cam valve timing specs in 1972

1971 BOSS and 1972 "R" code Comparison Summary

The major difference is in piston and cylinder head design. 1971 BOSS engines use a "quench" combustion chamber, whereas 1972 heads are the "open" type with the 1971-size valves and ports. Both are machined for a mechanical cam valve train, (which is the chief difference between the BOSS and CJ heads that are machined for a hydraulic valve train). '72 engines use a forced flat-top piston (8.8: 1 compression ratio) while the '71 engine uses a forged pop-up piston (*11.1: 1 ratio). The '71 cam provides increased duration and overlays over the 1972 grind.

(* Some automotive literature have reported 11.3: 1 or 11.7: 1 CR)




351 CLEVELAND ENGINE COMPARISON

"The Engine of the 1970's" Link to a website i found this info to bump my thread , some interesting reading at least http://www.boss351registry.com/351_Cleveland.htm

http://www.supermotors.net/vehicles/art ... 5-a2-1.php

some more info for the cleveland fans

 

 

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