Quote:
Originally Posted by Jay S
Luke will measure that head I have and see what it measures.
In regard to the ra 3 having higher compression than a ra 4. I had the pistons wrong for the 69-70 ra3, the piston part # I thought was for the ra 3 was the old domed pistons. The L2440F was the RA 3 piston with the bevel on the top, the total volume was 10.5 cc total. It seems like that was the piston style on all the 4 bbl engine from that era except the ra2 and ra4. Not something we run into anymore since they have not been made for years.
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I'm not clear on what you are saying?? But the piston in your picture looks like a forged version of the 1975 and later cast 400 piston. That's when they started to using the piston. The 70 RA III used a cast flat top that looked visually the same as the RAIV version except the RAIV is forged. I believe the RAIV piston is identical to the old TRW Power forged pistons.