Re: Aluminum heads
If you do swap out to the alloy heads, MAKE sure you check the piston to head clearance , do this over the whole top of the piston, I just been through this on my 99a engine, I removed the cast iron heads, they worked well but one was cracked, replaced them wit a new set of Edelbrock ones, I checked the clearance about an inch out from both edges, they had plenty, ran it down the valley/(160 miles), and when it got hot and reved up there was a knocking noise.Pulled the heads and the head was not the same radius as the piston, and they were just touching right in the centre. an easy fix on the mill, but a rookie mistake on. my part.
Lawrie
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