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Post your stock head casting number, but it is most likley either 101cc (like my 290's) or possibly 109cc.
I have not confirmend, but rumor has that the 99cc Vortec 7.4L heads combined with proper Gen VI head gaskets will work on the Mark IV motor, and they claim performance on a big block compareable to the Vortec small block heads. Give Scoggin Dickey a call.
When I get around to doing heads, If I can confirm this, I'll buy the Vortecs instead of R&Ring my 290 castings. Combined with a flat top on a 402, should be about 9:1 compression, and with a flat top 427, about 9.5:1
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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