[lakecrazy]

1978 460 D1VE block bored .030
TRW 2443 dome pistons.
D3VE-A2A 91cc Heads with stock valve sizes
Pedestal rocker bosses cut for studs and plates.
Exhaust ported only (removed emission bosses)
Comp Cams 292H and full kit 244/244 duration @.050 560/560 lift hyd cam.
9qt truck oil pan with Melling M84DHV pump with rear pickup tube.
How much compression will this combo produce?
How much horsepower?

Thanks for your your reply.

 

[mustangboy]

If I"m correct your pistons are rated at 12.5.1 with the older 68-71 76cc heads. So with your 91cc heads that will drop you about 2 points,so I'd guess if your decks haven't milled you should be around 10.4(your deck hieght is slightly taller than the68-71 blocks so I knocked off another .1). You don't say what kind of intake or carb or exhaust your running but I have a dyno of a .030 over 460 with 9.5:1 compression, milder cam(.518.513L and216and228duration @.050) shorty headers and just the bump removed in the exhaust and a 750 Holley.The engine made 434.6 hp at 5000 rpm and 518.9ft/lbs of torque at 3500 rpm.This was with an edelbrock performer and the camshaft listed was only good to 5000 rpms (your cam should make power well beyond that ) but this will give you an idea depending on the rest of your combo.Sounds good so far.

 

[Mach1Morgan]

Ford 460 heads, even with the exhaust side ported have a bad intake to exhaust flow balance. I would be benificial if you had a dual patterned cam that had 8 to 12 more degrees of exhaust duration than intake duration. This almost always picks up the midrange and top end power without adversely effecting low end torque. All factory 429, 460, and 4V Cleveland heads need cams like this to perform the best, even when ported.