1972 LT-1 Exhaust System for judging ?

[Mike E.]

Re: 1972 LT-1 Exhaust System for judging ?

You mean like this?:



and

I don't recall a Playboy ***** being in the JM. Perhaps that's a 1970 only feature. Seriously ...Beautiful car!


Edit: wow....The forum filtered the word *****.


Mike

[Dave S.]

Re: 1972 LT-1 Exhaust System for judging ?

Terry,
How about July 2004 in Windsor.???

[Terry M.]

Re: 1972 LT-1 Exhaust System for judging ?

Terry,

Nice paint job. Krylon Laqueer I presume?????

JR

Absolutely JR. Nothing but the best for my baby. BTW: I didn't intend it to come out that way, but you can see the Jet Stream Blue across the street. Nice comparison to the Mulsanne Blue. Too bad the Deep Water Blue of the Chevelle is hiding in the trees to the right. That's another Krylon Clear job also.

[Terry M.]

Re: 1972 LT-1 Exhaust System for judging ?

Terry,
How about July 2004 in Windsor.???

If that was 2009, then it has been only 9 years in the garage. That was the last NCRS meet it was at.

[Patrick H.]

Re: 1972 LT-1 Exhaust System for judging ?

Absolutely JR. Nothing but the best for my baby. BTW: I didn't intend it to come out that way, but you can see the Jet Stream Blue across the street. Nice comparison to the Mulsanne Blue. Too bad the Deep Water Blue of the Chevelle is hiding in the trees to the right. That's another Krylon Clear job also.

If that's the Chevelle then I know the photo is a lot more recent than Oct 2007.

[Terry M.]

Re: 1972 LT-1 Exhaust System for judging ?

If that's the Chevelle then I know the photo is a lot more recent than Oct 2007.

That photo is October 2013 when the 1970 left the garage for the first time in 9 years. Patrick, if I am in the photo you can tell when it was taken by the amount of gray in my beard.

[David P.]

Re: 1972 LT-1 Exhaust System for judging ?

Great analysis, Paul. Do you have any equally insightful analysis of the CC system?

[Patrick H.]

Re: 1972 LT-1 Exhaust System for judging ?

Great analysis, Paul. Do you have any equally insightful analysis of the CC system?

David,

Aluminized systems such as Corvette Central's get the standard 25% deduction as per the Judging Reference Manual. So, in real life, they might judge "better" than Gardners. That is why I've often told people to save money, and spend half as much on the CC system as the Gardner, and also avoid rust.

With a carbon steel Gardner exhaust, especially on a base motor (2 inch) car, you would likely do relatively well. The mufflers will still be an issue unless you find good used or NOS ones.

Patrick

[David P.]

Re: 1972 LT-1 Exhaust System for judging ?

Thank you Patrick. That's just what I was after.

[Mark E.]

Re: 1972 LT-1 Exhaust System for judging ?

Ross----- All 1966 -80 Corvette small blocks used exhaust manifolds with 2" outlets. So, all of those with 2-1/2" exhaust (L-46, LT-1, L-82) used the 2" to 2-1/2" transition. On earlier cars the pipes were swaged. On later (from about 1973 and SERVICE after about 1973), a 2" short section was welded to the 2-1/2" section.

All big block were 2-1/2" for their entire length except 1969. All 1969 big blocks used a 2" exhaust. So, there was a short 2-1/2" section from the manifold which transitioned to a 2" pipe for the rest of the system.

Why did Chevy go through the expense of specifying 2 1/2" pipes behind 2" manifolds? Did the engineers conclude larger pipes provided more power even with a 2" restriction upstream? That certainly isn't intuitive. And if manufacturing cost is the issue (duh), wouldn't using L84 style 2 1/2" manifolds be cost effective since it eliminates the cost of adding a 2" to 2 1/2" swag in each pipe?

And Chevy did just the opposite with '69 big blocks! (2" pipes behind 2 1/2" manifolds.) That isn't intuitive or consistent.