A point or two is not 91 octane to 92 or 93 octane.

It's 91 octane to 91.2 or 91.3 octane. That's the "point" as in point two or point three octane.

But yes, MMT works better than petroleum distillates, much better, but not as good as TEL.

Airport is 10 mi away,been running it since 1992 !!

mine is 1/2 mile away, and even has "pay at the pump". been using it since 2000.

A point or two is not 91 octane to 92 or 93 octane.

It's 91 octane to 91.2 or 91.3 octane. That's the "point" as in point two or point three octane.

But yes, MMT works better than petroleum distillates, much better, but not as good as TEL.

Not the case, MMT can raise octane by a full point or 2 from 91 up to 92 or 93. Not from 91 to 91.1. MMT may not be the best for your engine or catalytic converter but absolutely can raise octane by a reasonable amount.

Super isn't $1.18 more a gallon so unless super ain't doing it for you it's cheaper to run super.

One of our left coast members either Mick or Frankeduster (iirc) way back had a nightmare going that route

This is with running super pump gas 93 octane from Mobile 1.

My cam is very mild for my application. It is a comp cams 21-223-4 which is advertised with a stock stroke to have a power band of 1600-5800RPM's. I already have .055" head gaskets and Eddy aluminum heads. I don't know what else I can do to get the SCR down besides changing pistons which I ain't going there.

I know many here have gotten 10.4:1 stroker motors with aluminum heads to work fine on premium pump. I would think maybe this mild cam is hurting a bit here as it can't "bleed" off that compression very well...

I was thinking of going to a roller setup eventually to pull a bit more from the motor and make it a bit more resilient with modern oil. I just wanted to get the car running reliably for awhile before I went back into the motor. I have spent the better part of two years since I sprung the car from body shop Hades, chasing vapor lock and other various issues.

I know this can be done without changing the rotating assembly, using race gas, methanol, etc. I think the only thing left here is the cam.



Yes, I remember that saga last year? I seem to remember he was running iron heads though and started off with considerably more cam than I currently have. Yes, I think about poor Frankenduster whenever I think about going to another cam shaft. :laughs:


When I had my car dyno'ed the guy said the engine wanted more cam for sure. He said I'm probably leaving 80-100 crank hp on the table with my mild flat tappet cam vs. a roller. The car otherwise has the drivetrain that would like more cam (2400 stall, 3.55 gear, hi compression motor).

Bottom line is I'd rather shell out for a better camshaft and upgrade the engine than be a slave to race gas. I have done some calling around and the closest place that sells race gas is 25 miles and through congested areas. I'd burn half a tank of gas to get there and back. If I had a source of race gas (or even non-ethanol premium) within 10 miles, I'd suck it up. I have been looking at getting pails shipped and at $60-70 for 5 gallons + ship, I think I'd rather save my $$ for the cam swap...if that will fix this problem for good.

Why not put an adjustable vacuum can on it and dial back the amount of the vacuum advance???

If such a part truly exists, provide a part number and source and I would surely order it. All I know that you can adjust is when the vacuum advance comes in but not how much as that's controlled by the arm itself.