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Hotrod70C10 · 03-03-2003, 01:46 AM

are you sure that the last number is an 8?
the only head casting number that I can find is
3973493 which was 71-72 400 with 76cc chambers i can't find the valve sizes for these.

03-03-2003, 01:46 AM	#2
Hotrod70C10 Low & Slow Join Date: Dec 2002 Location: Oklahoma Posts: 1,047	are you sure that the last number is an 8? the only head casting number that I can find is 3973493 which was 71-72 400 with 76cc chambers i can't find the valve sizes for these. __________________ 70' C-10 LWB Fleetside 4.5/6 drop