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Old 03-18-2014, 08:40 PM   #1
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Default ST single valves springs vs ST dual

I am having a little problem deciding which one I need for my application
the single one are rated to 54lbs and the dual ones are rated to 74lbs
My setup will be
GT35 .70/.63
15-25psi
FMIC
built block
ported and polished head and intake
75mm throttle
3" full exhaust system
cam gears
stock cams
MS2 ECU
Also would it be worth the ST valves in 1mm oversize?
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Old 03-18-2014, 09:07 PM   #2
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Call me at the shop (or email) and I can help you decide which spring is correct for your application.
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Old 03-18-2014, 11:26 PM   #3
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I have singles currently in the engine with inner springs from the duals that Sav just sold me sitting on the bench waiting to go in when I have time. So far the singles havent had any complaint at 14psi @ 8500 rpm with stock vvt cams, stock soild lifters, and stock valves. And it has bounced off that limiter at speed with the singles.

What 75mm throttle body are you planning on running on a stock intake manifold?
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Old 03-18-2014, 11:38 PM   #4
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Quote:
Originally Posted by Leafy View Post
I have singles currently in the engine with inner springs from the duals that Sav just sold me sitting on the bench waiting to go in when I have time. So far the singles havent had any complaint at 14psi @ 8500 rpm with stock vvt cams, stock soild lifters, and stock valves. And it has bounced off that limiter at speed with the singles.

What 75mm throttle body are you planning on running on a stock intake manifold?
That's nice to hear! V6 mustang
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