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Old 09-07-2012, 08:34 AM
cdminter59 cdminter59 is offline
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valvespring upgrade questions

Lunati recommended valve springs. #73943K1, OD. 1.266, Spring Rate 462 lbs., ID. 0.883, Inner damper, fits 11/32 valve stem diameter. Talk to a machinist for a similar spring replacement. You may not have 11/32 valve stems. Valve seals #78501-16. Another thing I hope you have had those heads checked by a machinist according to threads on Chevelle.com the valve seats crack easily. GM added an addition exhaust crossover (more heat) causes the cracks. Find a set of 73-early 74 76cc heads. Replacement GM heads 3973487,3998993. If you you want a good set of heads check these out. Can't beat the price! Summit Racing SUM-152123 - Summit Racing® Cast Iron Cylinder Heads for Small Chevy - Overview - SummitRacing.com
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