perplexing situation

[427TJ]

[ QUOTE ]
The toys are worth the extra money

[/ QUOTE ]

That hits the nail right on the head.

[Andy]

A good website that will help you is, http://www.empirenet.com/pkelley2/DynamicCR.html You need to figure out what your dynamic compression ratio is. Download his calculator, and enter in your engine's specs. According to Kelley, long as it is around 7.5-8.5:1, you should be fine on pump gas. If your dynamic compression is over 8.5:1, then you'll need to run a higher octane fuel than 93. The more overlap your cam has, the more compression it will bleed off. I've been researching this stuff for a few years now, since I'm putting together a pretty serious 406 for my 67. The combo I plan to run will have a static compression ratio of 9.8:1 and a dynamic compression ratio of 8:1, which will be perfect for 93 octane pump gas. My engine builder said that anything over 8.25:1 dynamic would create problems with detonation in the summer, and I would have to pull timing out of it. My motor should put out around 520-540 hp and around 550 ft lbs.

[1railman]

If it were a daily driver, maybe so. But if not driven much, I would keep the dome top. Plus you get to smell that wonderful 116.

[musclecarjohn]

110 leaded premium runs me $6.28/gallon here with all taxes.
I blend 1/2 & 1/2 w/91 Premium pump gas which is as good as you can get here...last time I was on the dyno,operator said the A/F mixture was spot on.
My cars love it and I wouldn't have it any other way.Would not change a thing or take timing out...where's the fun in that? If my cars didn't pop & bang and smell like they do,they sure wouldn't be as much fun...and I'd probably end up driving a Honda Civic.

Don't do it I say...

[Keith Tedford]

We've put over 30K miles on our L78 Chevelle since we bought it in 1997. No ill effects so far on 91-93. Being stock factory, the compression ratio might be closer to 10-1. Seems that many have been found to be down a point and more.

[indyjps]

calculate your true comp ratio before its assembled

[BBIGG BLOCK 396]

I hate butting in on you guys but here locally a lot of guys are beginning to have a lot of problems with the HIGH PERFORMANCE FUEL! Seems they are reformulating them and adding ETHNOL or some other OXYGEN BASED ADDITIVES which is causing major problems when left sitting for a couple of weeks.A lot of guys have had to have ther carbs redone because of this problem.I would surly be checking on the racing fuels you are using for additives to your Hot Rods to make sure it is not one of the reformulated brands.I will try to find out the names of some of the fuels they are having problems with and post them.

Bobby