1421Re: The '49-'62 V8... anything out there?
- Dec 11, 2004jvandecreek25,
The 425 heads will not gain near that much in compression. It has
been said that they are 96cc, but I believe they are more like 107cc
or so. That figure comes from experts that I trust.
CR on a stock engine can vary. Assuming a stock late 500 is 8-1, and
the heads are 120cc, the 13cc reduction in combustion space would
raise the CR to 8.7-1. Assuming the stock engine was 8.5-1, the
change would give 9.25-1.
It would take a change in combustion space of apx 27.5cc to raise
compression of an 8.5-1 engine to 10.5-1.
much about the seemingly low hp. ratings, in actual
> performance in a light vehicle there is not of much noticableperformance
> difference, you could mill the heads but a better choice is to swap
> on a set of 425 heads, compression will be about 10:5 and will give
> you and easy 40 hp more, not the best breathing for all out racing,
> but fine up to around 4500 rpm, making for strong street
> cheap, next best change is a good cam, then an Edelbrock intake.
> Your 472 Trans will bolt right up.
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