CLASS RACER FORUM - Aftermarket/Replacement Cylinder Head Rule Change

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- - Aftermarket/Replacement Cylinder Head Rule Change (https://classracer.com/classforum/showthread.php?t=68473)

Re: Aftermarket/Replacement Cylinder Head Rule Change

L-98 Corvette was an angle plug head too I believe---FED 387

Re: Aftermarket/Replacement Cylinder Head Rule Change

Quote:

Originally Posted by Jon Sarrett (Post 560066)

Actually, LT-1 heads are angle plug.

But the replacement heads listed are for 62-70 year models.NO angle plug heads during those years.

Re: Aftermarket/Replacement Cylinder Head Rule Change

Quote:

Originally Posted by Dwight Southerland (Post 560076)

But the replacement heads listed are for 62-70 year models.NO angle plug heads during those years.

Dwight there never alum heads for 428,390 Ford's either,but they Got them now. Cant see how the heads for the chevys would make much diff.

Re: Aftermarket/Replacement Cylinder Head Rule Change

I'm still perceiving Stock Eliminator through 1980's glasses, because that's what I was most comfortable with. Headers, converter, ring & pinion, and a 9" tire...on a car with a VIN number. Not saying it's better or worse, just saying I'm somewhat stuck in that perceptual paradigm.

But whether I'm comfortable with it or not, Stock has moved on. Just like stock moved on from the '60s, to the '70s, to the '80s, all the way through today.

I still find Stock Eliminator fascinating, but it is more and more becoming a class that is difficult to explain to lay people, which I think hampers it's value as a financially viable spectator commodity.

Ultimately, I think that Stock is going to die, and when it does, I will very much miss it. It is (and was) a beautiful class.

Re: Aftermarket/Replacement Cylinder Head Rule Change

Quote:

Originally Posted by Jim Hanig (Post 560078)

Dwight there never alum heads for 428,390 Ford's either,but they Got them now. Cant see how the heads for the chevys would make much diff.

Then NHRA's rules for Super Stock heads "Grinding and polishing in combustion chamber permitted. Welding and/or applying epoxy in combustion chamber prohibited. Spark-plug hole must maintain the stock location, size, and angle as machined by the OEM; spark-plug adapters prohibited." can just be ignored. Have you seen the combustion chambers on the Jones heads or the Edelbrock heads? I guess everybody is satisfied to be a frog in a pot with the fire on high.

Re: Aftermarket/Replacement Cylinder Head Rule Change

Here we go again!

Quote:

Originally Posted by Dan Fahey (Post 560058)

This is where I will miss the IHRA Pure Stock.
Basically the Old Stock Eliminator Rules.

Crate Motors were always a natural fit.
Replacement engines were always common.
Did not morphed the Stock Eliminator concept.

"Key word is WERE! IHRA decided to drop the Stock classes. Maybe if IHRA HAD morphed into NHRA Stock classes and rules,perhaps there would have been enough contestents that IHRA would have considered Stock to be viable still."

Current rules restrict inviting the new generation of Racer to play in our sand box.

"How exactly does expecting "the new generation of racers" to follow the same rules and procedures as all the other Stock class racers have to, restrict these new generation racers from playing in NHRAs sandbox?"
You do not do not see many 20 - 30 year olds.
Do see 50’s, 60’s, 70’s and 80’s and passing away.

"From what I have seen, the vast majority of 20-30 year olds simply do not care about cars, or racing at all. When I was 15, I was counting down the days until I could turn 16 and get my learners permit, and hopefully, my own car. This just does not seem to be the case anymore, at least in more populated areas. cars are simply not a high priority for many younger people, modifying and racing even less so. I don`t think that radically changing the status quo, for the thousands of faithful racers that have participated in Stock or S/S for many years is the answer."

IHRA had the right idea with their Class Eliminator set up.
Had NHRA adopted the IHRA structure.
There would have been shift from traditional Stock.

"Had NHRA followed IHRAs "right idea" structure, maybe there would no longer be Stock classes in NHRA either. From the number of NHRA racers on this site, looking to hopefully find a spot in a National Event with a full quota, and the 1000`s of Stock Class racers that attend NHRA Nat`l & divisional races, the NHRA Stock & S/S classes still seem to be pretty viable."

D

Re: Aftermarket/Replacement Cylinder Head Rule Change

Quote:

Originally Posted by Todd Hoven (Post 560054)

One of the candidates for a replacement head for Pontiac round port was a head made by Kaufman Racing. Everything was a go but Bruce rejected it because of angled spark plugs. Guess that is not a problem anymore as long as you race a Chevrolet.

When we tryed to get the aftermarket heads leagal for the Mopar BB , we first got the Mopar performance 452-A heads leagal for SS onley. At that time their was no way that the Edlebrock could be legal for Stock/ SS, because off onley one thing, their was angel spark plugs. Bruce told us now way ! Then after a year or so Edelbrock came with a straight plug style, and it was ok.
But that was a Mopar, not a Chevy !.

Re: Aftermarket/Replacement Cylinder Head Rule Change

How much are angle plugs worth on a SBC SS'er ? Not looking for conjecture.
Real world only, please.

Re: Aftermarket/Replacement Cylinder Head Rule Change

Bill Jenkins always said 10-12 HP. Chevrolet engineers said it helps more with higher compression ratio and dome in the combustion chamber, but that it was about 10 hp on flat top pistons (350 cu in, 10.5 compression). I have only seen an un-scientific test once on a 377 dirt track engine when a pair of ported 461 heads were replaced with unported 292 heads and the difference was 22 hp.
If high compression benefits more, then consider that all blueprinted 62-70 327 and 350 flattop pistons engines run between 11.5 to 12.0 compression.

Re: Aftermarket/Replacement Cylinder Head Rule Change

Quote:

Originally Posted by 6130 (Post 560084)

Ultimately, I think that Stock is going to die, and when it does, I will very much miss it. It is (and was) a beautiful class.

Stock Elim. DIED in 1985 !