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Re: stock valve springs/retainers - 420a
How high do you plan on reving the motor? I am running a stock head and have taken it up t0 25psi with no problems. But only to about 6.5k, if you plan on reving it much higher or running over 30psi of boost I would upgrade them.
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98 Eclipse GS Turbo
Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio
1981 Chevy Scottsdale
1987 Nissan 300zx - Chump Car
2001 BMW 325i - DD
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