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7700 max rpm bbc,I think install height is around 2.000", not positive. 2.3 intake, 1.9 exhaust severe duty valves, bushed red zones, lightweight steel retainers
 

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What's the intake valve weigh?
What's duration @ .020" on both sides? Call Steve and ask if you don't know.
 

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Dunno about duration. Cam card is above. 143 grams I believe is intake weight... prob gonna run 2.1"valve.....221456 seems to fill the bill, but ouch, $650a set. I racer buddy said a triple may be safer. Prob would be cheaper anyways... thoughts?
 

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EFI/N2O JUNKIE
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Dunno about duration. Cam card is above. 143 grams I believe is intake weight... prob gonna run 2.1"valve.....221456 seems to fill the bill, but ouch, $650a set. I racer buddy said a triple may be safer. Prob would be cheaper anyways... thoughts?
Shit! I guess I should kiss my buddy that got me my polished PAC springs, could buy two sets for what you are paying!
 

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I've run Pac 1224, Isky red zone, Trend 7/16" x .165" tapered in My Mopar 2.25" ,1.88" Ferra BB Chevy+.100" steel valves, 7200. 285/[email protected]" .800" lift so I shimmed them to 1.950" height. After 200 passes I pulled and checked, zero pressure loss. Going on 300 passes now. Check 1228 as well. Could shim to 1.950" for additional pressure.
Doug
 

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Shit! I guess I should kiss my buddy that got me my polished PAC springs, could buy two sets for what you are paying!
There's a world of difference between a PAC and a NexTek spring. Manley NexTek springs are made by associated spring, and are comparable to PSI.
 
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