Thread: last ? on compression

Tweet

Sorry Shawnlee, I was typing while you had already posted.

1. 76 cc heads with your flat-tops will make 10.15:1 c.r.
2. 441 heads will not support 360-400 horsepower or anything close to it.

Let me outline a recipe for you that will work:
400 block bored 0.020" or 0.030" (don't bore the block any more than is necessary to clean up the bores. These pistons are available in either size.)and block cut for zero deck (crown of piston exactly even with the block deck at top dead center).
Keith Black hypereutectic pistons, part no. KB126, 30 cc cup, 9.1:1 c.r. Use with 5.7" 350 rods. Pin end of rod may require clearancing to eliminate interference with underside of piston crown. Big end of rods will need to be clearanced to eliminate interference with the cam, (slight grinding near the bolt head). Slight grinding may be required at the pan rail where the oil pan bolts up to provide clearance for the big end of the rod.
Scoggin-Dickey part no. SD8060 Vortec head kit. Includes 2 heads fully assembled, head gaskets, rocker arms, Edelbrock Performer Vortec intake manifold, intake gaskets and 12-point intake bolts. Make a deal with them to trade out the 350 head gaskets for 400 units, 0.039" compressed thickness. Drill the heads for 400 steam holes before you install them. Use your 268 cam and enjoy. Just make sure it has a lift of 0.450" or less. The stock Vortec heads will only accomodate that much lift. If you want a cam with more lift than that, you'll have to change springs in the heads.