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#21
06-14-2024, 11:30 AM
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All depends on the combination for sure. My 470/409 made the same with 1.7s as with 1.8s. Also no more with 750 cfm dual quads vs 600s.
My pump gas 455 in my 78 made more with every increase in ratio-Ultradyne 239.247 on a 112. About a 5 -8 hp bump 1.5-1.65 HS(actually with "real springs" measured 1.72) and then Crower 1.8s on the intake(the SS were too expensive for a full set. We did not make a real pull with the 1.33 break in rockers.
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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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#22
06-17-2024, 04:03 AM
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If your heads flow well at .600 lift or higher run a lobe in the 390 to 400 range with 1.65 rockers. My cam has a .391/.400 lobe lift with 1.65 HS rockers..zero issues.
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 466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
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#23
06-17-2024, 09:38 AM
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One advantage of a higher ratio rocker seat time is the same but at the valve it acts like it has more @ 0.050 and since the lobe can be less aggressive easier on lifter.
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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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#24
06-17-2024, 08:03 PM
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Quote:
Quote:
Quote:
My engine is coming out and getting disassembled this weekend. Still need to start making some purchases.
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-Jason 1969 Pontiac Firebird |
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