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Old 11-08-2017, 04:54 PM   #1
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mattfranklin's Avatar
Join Date: Dec 2011
Location: Moraga, CA
Posts: 502
Want to use stock 1970 Z-28 springs, but spring seat pockets machined to ~1.47"

I bought a pair of ~1970 Chevy small block heads (camel hump, 2.020/1.600 valves, casting # ‘186) for my truck.
The spring seat pockets have been machined to ~1.47” diameter for dual springs.
Can I still run stock 1.241” diameter springs with these heads (as long as I use shims that fit the pocket)?

Or do I have to buy some locators or spring cups to stabilize the bottoms of the springs.

I want to use the 3911068 stock Z-28 springs or equivalent. The plan is to use stock 1970 Z-28/LT-1 parts or equivalents as much as possible.
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

Last edited by mattfranklin; 11-08-2017 at 05:02 PM.
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machined spring seats, stock valve springs

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