Re: M&H Flat head

Posted by Rusty O\'Toole On 2012/1/28 2:52:10

You won't need super gas, 1954 Packard had the highest compression ratio ever for a flathead, 8.7:1 which is within the range of today's 87 octane regular.

Mid range or 89 octane might be worth a try but probably won't work any better than regular.