08-01-2016, 08:54 AM
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CC Member
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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
Posts: 549
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Not Ranked
I'm hoping it was a bad batch, that it was during their transition from one manufacturer to another. I'm going to install these and monitor it very closely. To use a different spring, I'd have to have the heads machined to fit a different size.
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