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85 head with 86 piston results
Posted: Wed Aug 27, 2008 3:47 pm
by starsnbars
I was running a stock 85 spree, after rebuild I am now using an 86 crank and piston but kept my 85 head on. Before rebuild, I was lucky to hit 28, now I'm hitting 33 easy on straightaways and about 36mph on downhills. This was in the perf tech docs, and after trying it, I would definitely recommend doing this for some top-end gain.
Posted: Wed Aug 27, 2008 3:55 pm
by Diesel Spree
i dont no but i think it might just be rebuilding it is what gave u the speed but thats cool it worked for u
Posted: Wed Aug 27, 2008 6:33 pm
by chevyguyjay
if what u say is true that u have a 85 motor, an 86 crank will not fit in a 85 block. the crank is bigger. u can put a 85 crank in a 86 block. 
Posted: Wed Aug 27, 2008 9:03 pm
by starsnbars
86 crankcase