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I have a have a 1970 formula 400 ram air car. My block is yz datye stamp a070. i have both #13 heads and #12 head. The car is auto with a/c. Phs docs say either head. Peate McKarty chart says the same. Wallrace racing chart different. I heard stories that Peate made a mistake when he wrote the book but can nort find it any where. Im tying to be correct numbers matching. What heads should I run? Can anyone send the link to clear this confusion up?
 

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As you have posted, opinions differ. So, I suppose it all depends on who's info you wanna believe. I'd go with the Wallace info & use #12 heads on all '70 RA3 engines & all '70 400 manual trans engines. According to their info, the #13 heads were used only on non-RA auto trans engines. BUT, we've all read about things that came from the factory that were NOT equipped as they were supposed to be.
 
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