Valve spring choices, PAC1218, or GM Performance?
Thread Starter
Staging Lane
Joined: Apr 2015
Posts: 74
Likes: 1
Valve spring choices, PAC1218, or GM Performance? Starting to dump money into my build. 6.0L, stock cam, and a home turbo system. Turbo choice not made yet, but shooting for 650-700 at the tire. My price fifference between the GM Perf springs is about half of the PAC springs. I'm trying to save in some areas to have more money for the turbo install. Anyone happy with the GM Perf springs in similar builds?
Lotta discussions out there regarding adequate spring pressure with turbo motors. I ran the LS6's as did Hellbent and then went to the 1218's and now dual BTR's. Never really noticed a difference other than what I think is increased lifter noise with more and more pressure.
TECH Fanatic
Joined: Jul 2010
Posts: 1,678
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We went 9.25@148 with the $60 blue ls3 springs with a 216/220 trick flow cam on 18lbs with stock pushrods in a L33. It wouldn't go any faster with more boost so we figured we were maxed out spring/pushrod wise.
