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11-22-2014, 02:22 PM | #31 | |
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Re: How many 9 second 396/375 alum head A/S A/SA
Quote:
The GMPP 401 aluminum head is listed as an NHRA accepted replacement part for the early cast iron big block Chevy closed chamber rectangle port head. There is a HP penalty for using the aluminum replacement head. For example, we used them on a 69 Camaro 427/425, and that raised the HP rating from 425 to 435, so we had to add 80 pounds when running them in A/SA. There are certain parts allowed by NHRA as replacements for old castings that are both difficult to find, and expensive to buy. In the case of cylinder heads, a HP penalty is applied, it usually starts at 10HP. In the case of the 401 head, it is not allowing a different engine combination, it is allowing the 401 head to be used as a replacement for the OE head, with a HP penalty applied. The same applies to some heads for other makes. An aluminum replacement head is allowed for certain combinations, and it carries a HP penalty.
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Alan Roehrich 212A G/S |
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11-22-2014, 02:34 PM | #32 |
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Re: How many 9 second 396/375 alum head A/S A/SA
Thank you for the clarification.
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Thomas NHRA 1959 E/SA |
11-22-2014, 03:32 PM | #33 |
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Re: How many 9 second 396/375 alum head A/S A/SA
Ken you have a very good car, but a 70 Nova should be 402/ 395 iron, or 402/ 405 aluminum.
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11-22-2014, 05:12 PM | #34 |
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Re: How many 9 second 396/375 alum head A/S A/SA
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11-22-2014, 06:23 PM | #35 |
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Re: How many 9 second 396/375 alum head A/S A/SA
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11-22-2014, 07:50 PM | #36 |
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Re: How many 9 second 396/375 alum head A/S A/SA
Definatley some very fast 396's out there!!
I think A/S will be cool this year too! Hopefully with the new cars in there own classes it should bring back some old school cars. .
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5664 AA/SA 1970 NOVA |
11-23-2014, 12:17 AM | #37 |
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Re: How many 9 second 396/375 alum head A/S A/SA
I went 9.95 in Dan Fletchers car with that combo in the semis in Pomona a few years ago. Unfortunately it was heads up and Jimmy DeFrank went 9.74. It was a 375 h.p. rating at the time but I'm sure Jimmy can still go 9's .
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Billy Leber 1150 SS, 1050 SG, 1962 STK, 185 SC |
11-23-2014, 09:39 AM | #38 |
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Re: How many 9 second 396/375 alum head A/S A/SA
I think Jimmy, Joe, and Lance can all go 9's in B/SA.
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11-24-2014, 07:51 PM | #39 |
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Re: How many 9 second 396/375 alum head A/S A/SA
well if the cars are built with NHRA specs, I would be surprised any of them could
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11-24-2014, 09:16 PM | #40 |
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Re: How many 9 second 396/375 alum head A/S A/SA
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