My E heads Dave CNC'd and put the 99893 springs were a little "soft" at 1.800 to get 140 I had to go 1.740-1.760.
I ran an UD 288/292 SFT on my RAIV heads and had some UD springs on it but can't find the specs.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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