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Thanks for clearing that up Daytona and Rapid. Im still learning. Although, if the block wasnt decked, then wouldnt that increase the piston to head distance, creating detonation and bad squish, but also lower CR?



Yes. Having .060 piston to head will give you no useful quench where .045 will give you good quench. However the difference in compression ratios between those two would not be significant. The quench is worth it in terms of detonation resistance, even though it'll increase your compression a tad.

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I've been playing around with a desktop dyno and if its at all accurate then you'll be hard pressed to make 500 hp with the Stealth heads, they just don't flow enough.



Dwayne (fast68plymouth) flowed a set of stealth heads verus a set of e-brock rpm heads, both heads straight out of the box. Here were his numbers he posted.

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4.375 bore, 28" test pressure, radius plate on intake, no tube on exhaust:

average flow for #5 and #7 cylinder

lift----I/E
.100--63.8/49.0
.200-140.5/104.1
.300-207.8/139.7
.400-239.2/164.6
.450-248.1/172.5
.500-256.1/177.8
.550-261.5/182.6
.600-265.3/188.2
.650-267.3/191.5
.700-267.3/195.8

here is an OOTB E head i tested recently, also the average for a left and right cylinder:

lift----I/E
.100--66.1/50.8
.200-138.3/105.4
.300-203.8/140.5
.400-243.1/163.6
.450-258.0/170.4
.500-265.7/178.6
.550-272.3/185.3
.600-276.5/190.3
.650-276.1/194.6
.700-275.7/197.3




You can see the stealths flow within +/- 4% of the RPM's across the board. So if the eddys are making 500+hp, the stealths will as well. If that's not enough for you, spend the extra 1k on sending them out to MCH for the CNC porting.