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Old 07-10-2004, 11:29 PM
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Originally posted by coldknock

Third line down under Features.

A lean burn most definately causes higher combustion temp. A liquid converting to a gas will reduce ambient temps in the immediate area, hence the ice on the intake.

That is a new description they added recently. I have a few older Holley books in my bookshelf and none of them recommend 390s for 2x4s.

I have used two 450s, two 600s, and two 750s. The 600s were about right for my 5.0.. The 750s were a bit too much. When I used the 450s, the mixture was lean all around. The idle circuit was insufficient, and the top end (PVCR area) was inadequate.
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