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I'm looking at a set of SBC# 3927185 heads that have been overhauled and modified as follows: The heads have been checked for cracks and slightly machine for straightness; Valves were enlarged to stainless steel 2.02--1.60 (68-70 cc) with hardened seats, seals, valve guides, 550 lift springs, retainers, locks, threaded rocker arm studs and guide plates.

***With the valve upgrade from 1.72--1.5 to 2.02--1.60 will that change the CC rating?

How does this modified head compare to the SBC #3927186 head? I know the 186 has a 64 cc rating.

Will the 3927185 modified head give me close to the same performance as the 3927186?

I will be putting the heads on a refurbished early 350SBC short block; .040 over flat top clevite pistons; using a LT-1 GM#3972178 camshaft

All replies/information will be appreciated

John Lighthart
Charleston, SC
10/25/09
 

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John

Were the heads ported when they installed the bigger valves? I'm just taking a guess here, but I think the ports are smaller than the -186's and other double humps which would make the bigger valves a waste of time and effort unless they were ported also.

They may not have needed to open up the chamber to fit the larger valves since they are 70cc to begin with.

It would probably run good at lower RPM's but your engine combo would benefit from a bigger head and more compression that a 64cc head would give you.

Mark
 
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