Thread: High throttle miss
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Old 07-26-2016, 02:24 PM
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Texasdoc Texasdoc is offline
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Join Date: Feb 2012
Location: Keller, TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
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Ok, just got a call from the shop. At least one broken valve spring. He said these springs are only good for 6000 rpm and up to 600 lift. I need springs for 7000 (I run up to 6000) and 650 lift (I have 610).

Any spring recommendations? I will probably need new retainers, etc. Anyone have a good site where I can get info about spring size, height, shims, pressure, etc. Also info about how to correctly setup everything?

It's weird, AFR says the stock springs that come on these AFR 195 renegade heads can handle 7000 and 650... Maybe they changed them at some point.
Last edited by Texasdoc; 07-26-2016 at 03:37 PM..
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