442w30. Welcome to the site. I'll start this reply and others will help I'm sure . . .
I'm not sure of your familiarity with y-block Fords so let me mention the five engine codes referred to in 1957.
B code was 272 CID; C code was 292 CID; D code was 312 CID w/ single 4 barrel; E code was 312 w/ 2 4s, and the F code was the 312 w/ supercharger.....the F-code engine with supercharger: what state of tune was it in? For example, was it like the 245-horse engine but with a supercharger?
- same flat top cast alum. pistons as D code engine
- same camshaft as used on B, C, D, and standard E code engine; different camshaft used on H.O. F code engine
- different valve springs with inner damper and one piece valve spring retainers than what was used on B, C, and D code engines
- different carburetor; used a Holley 4000 akin to what was used on '56 Lincolns [carb was not a bolt on swap from a Lincoln however]
- different intake manifold for F code carburetor
- different cylinder head castings; same valve head diameters; larger combustion chambers to lower static compression ratio
- same rocker arm ratios as B, C, D, and E code engines
- different ignition distributor internals; different distributor plate w/ dual points, different condenser, different distributor cam, different centrifugal advance springs, different vacuum advance chamber utilized, different centrifugal advance curve
- 2 different crankshaft dampers; one for standard trans, different damper for automatic transmission
- different fuel pumpWhat about the 2x4 engine? Was that the same as the 245-horse engine aside of carburetion?
- same cylinder head castings as those used on B, C, and D code engines; all 4 series engines same valve sizes, combustion chamber volumes
- my understanding is that different valve springs with inner damper and one piece valve spring retainers were utilized commencing in January / February of '57. These were different than the single coil springs used on B, C, and D code engines
- same camshaft used on B, C, D, and standard F code engine; different camshaft used on H.O. E code engine
- same rocker arm ratios as B, C, D, and F code engines
- ignition distributor internally tweeked; different secondary centrifugal advance spring than D code; vacuum advance chamber shim pack different; advance curve different than D code engine What was different about the E-Bird upgrade to 285 horses? Was it just compression or was there more?
- lack of documentation on this issue causes disagreement and debate! My understanding with unknown component specifics:
- H.O. E code engine utilized a dual point distributor
- H.O. E code engine used a different camshaft than the D code engine
Hope this helps!
a.k.a. Charlie Brown
near Syracuse, New York