austinseanchris

Not speaking for him but I think he meant the smell of it...at least that's what I was agreeing with...

austinseanchris

I'm showing piston clearance(in piston) is .00025-.00035

63mako

If the DCR is 8.6 to 1 you might be ok on pump fuel but if it is tuned for max HP probably need a couple gallons of the 110 topped off with 93. If the compression is only 10.1 to 1 you will probably be OK on 93. The thing is some builds run fine on pump fuel at 8.6 or 8.7 to 1 and other clatter at 8.2.

forvicjr

Yes, the smell was what i was refering to, but there are a lot of sleepers out there. that the only thing you notice is the smell of race fuel. Then you see them at the track and they roll off a 6.90 in the 1/8.

sub006

Back in college (1967) I tried a tank of 103 octane Chevron Custom Supreme in my '64, instead of the Super Shell I'd been using. The car had more power (burning rubber with a less throttle), and I decided for a few pennies more (still under 40 cents a gallon!)I'd switch to "the good stuff". I've always kept track of gas mileage in a log, and soon found that, driven the same as before, my mileage dropped from 15 to 13 and change. I went back to "lowly" 100 octane and the relative economy returned.

So I agree higher octane fuel is more readily consumed, or "burns quicker" in my experience.

Derrick Reynolds

Sure, yeah, ignore Mike. He has already agreed that he is dumber than I am.

Mike Ward

Well, I obviously regret participating in this thread. I frequently make the mistake of not picking up on the subtleties of someone who is asking a serious technical question and may end up hearing things that contradict their preconceived ideas, vs. someone who just wants others to agree with them no matter how misinformed and off the track they might be.

You appear to be the latter case, so I should have avoided posting. No matter. Yes, I am very blunt with my answers. I don't come here to chat and smile or talk sh*t like many others do.

Please, please block me so that I no longer annoy you. If you like, I'll also delete all my posts. You'll still end up with same net result of NOBODY agreeing with you that it's a good idea to run race gas for other than feel good reasons. But I repeat myself. Good luck.

jackson

that site claims L-48 connecting rod weighs 13.7 ounces.
That's less than 400 grams. BS! There's a passel of pro builders around Concord NC who know a stock base 350 passenger car rod weighs a LOT more than 400g ... don't trust me ... ask them. If they were close to 400g, they'd be worth lotsa $dough$. I've never weighed one without bolts, but even sans rodbolts I expect it's over 400g. And who TF actually sets up & measures a comb chamber to the hundredth of a cc? Across production, they vary at least a couple whole cc's both +/-. Hey, check that duration (~340) & overlap for L-82 cam; JUNK! Nice lookin' spec sheet there but it's tainted (even if they claim its data came from on high).

While assisting GM's suppliers w/ process improvements & validations, I "acquired" several "doc-controlled stamped approved" engineering drawings for GM parts. I retain them to this day but No, I'm not sharing them. I've worked with hundreds of others. It is not uncommon for such drawings to bear mistakes/errors; usually only one / minor but sometimes many & sometimes gross. Even though engineers tom, dick & harry have signed off on them.

Suggest don't trust everything you find on internet, including this thread; nor even this very post I've just written.

2armor

If the 8.6 DCR is too much for a pump gas, he could alway retard his cam 4* to lower the DCR, right?

Easier said then done and I learned the hard way to but: plan the build right for what you want, save the $$$, order parts, pull and build!

I'm going through the build in phases too only because of tight $$ issues and setting priorities. Otherwise, like many of you, it would be game on.

OMF

Guys...... The guy just wants to run race gas in his car...thats it. It won't do any damage to his engine (he could get more performance from 93 octane) but he wants to run race gas....and feel good about it.
Fill it with 110.... turn the key, and enjoy....isn't that what its all about?

fauxrs

as the owner of that site. I make no claims as to the accuracy of the specifications included in the package that gm sent me as a part of their restoration pack. I only claim that is what the spec sheet claims.

I do Agree however that one should never take on faith, what one reads on the Internet, or anywhere else for that matter.

austinseanchris

You got it bro...