The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Want to use stock 1970 Z-28 springs, but spring seat pockets machined to ~1.47"

**mattfranklin** · 11-08-2017, 04:54 PM

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.

11-08-2017, 04:54 PM	#1
mattfranklin Senior Member Join Date: Dec 2011 Location: Moraga, CA Posts: 801	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 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 Last edited by mattfranklin; 11-08-2017 at 05:02 PM.