New 5.5:1 Cylinder Head Availability

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Originally Posted by Keith True

You can't mill an A head to gain anything.The high-compression head has a whole different combustion chamber design.Some call it a heart shaped design.I don't have any pictures,but folks on here have posted the stock and high compression designs side by side.

Good to know. I went the mill route with my V8 heads, and it worked great, but the A head is another animal. Thanks for the clarification.