Question on large diameter valve springs
Thread Starter
TECH Apprentice
Joined: Jun 2002
Posts: 355
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From: Earth
Question on large diameter valve springs I have the X1, MTI cam, and want to go with the larger diameter, dual springs. Lift is .609/.588 and I assume the ramps are agreesive.
Crane has a spring that will give 133# seat and 388# open -P/N 99893- anyone using these...or how about a better reccomendation
Crane has a spring that will give 133# seat and 388# open -P/N 99893- anyone using these...or how about a better reccomendation
TECH Junkie
Joined: Nov 2001
Posts: 3,604
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From: Los Angeles
Re: Question on large diameter valve springs 390 open may be too much for the stock lifters. I beleive most places use the Comp 987's, or 978's, depending on the length of your valves. Maybe shooting for 330-350 open pressure would be better.
Thunder racing carries those springs and I've used 987's on 2 sets of LS1 heads so far. As long as the height is set up right and your valvetrain isn't ultra heavy they work great.
Thunder racing carries those springs and I've used 987's on 2 sets of LS1 heads so far. As long as the height is set up right and your valvetrain isn't ultra heavy they work great.
