They do not perform well on premium pump gas. Been there done that, knock city. You need to mix in at least 5 gallons of 110 leaded on a full tank if you're using stock closed chamber heads and TRW pistons. If your block is decked and your heads milled you'll be well over 11:1 compression. If you want your motor to drive like it did in 67 and get enough timing out of it, around 36 degrees total with vacuum advance disconnected, you'll need better fuel. People say you can run pump gas on these motors which is probably true if you retard the timing and make it run like a dog.
I run 5 gallons of Sunoco 110 leaded mixed with 91 pump gas and it runs great!
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04-02-2021, 06:58 PM
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