Quote:
Originally Posted by Chuck_Burg
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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Well, I was afraid of that, but I’ve still heard conflicting info on this. It certainly makes sense tho, as my original engine drank Sunoco 260 like water 50 years ago, but there was NOTHING like the feel & power of that engine! So, what do owners do who readily drop hundreds of thousands of dollars on original high performance muscle cars like Hemi Cudas, 427/435 Vettes and such at auctions? They seem to run fine across the auction block. Do all owners fill up at the airport to be able to enjoy their expensive rides! That includes owners of survivor hi-perf rides. I don’t consider this to be a dumb question! If I need to significantly detune my build it may not be worth it to me. If racing or airplane fuel is what I need to run I have no problem with that.
I’d appreciate more input on this. Thanks, John