1970 lt1

[James S.]

My 70 LT1 had headers on it when purchased by previous owner,what heat riser do i need to look for to make it right? and who sells the best welded exhaust sytem for a 70 LT1? Thanks for any info....

[Mike F.]

Re: 1970 lt1

IIRC the heat riser valve is just the standard 2" valve used on all small block Corvette's from 68-74.

I believe most people go with either Gardner or Allen exhausts, but you will need to get the mufflers welded to the exhaust pipes on your own.

http://www.gardnerexhaust.com/ or http://www.allencorvetteexhaustsystems.com/

[James S.]

Re: 1970 lt1

Thank you.

[Joe L.]

Re: 1970 lt1

My 70 LT1 had headers on it when purchased by previous owner,what heat riser do i need to look for to make it right? and who sells the best welded exhaust sytem for a 70 LT1? Thanks for any info....

James------


The original heat riser was a GM #3887024. That was discontinued many years ago and replaced by GM #362652 which is now also discontinued without supercession.

The 3887024 would be the most correct but it might be difficult or expensive to find. Also, be aware that many of the valves on the market which claim to be "NOS" are actually aftermarket valves which REPLACE the 3887024.

Most of the valves on the market are reasonably similar to the original valve, though.

[Bill L.]

Re: 1970 lt1

IMHO the Gardner system is still not correct and very very expensive. There are previous threads discussing exhaust systems. The Corvette Central system fits great and costs a LOT less. They also offer free shipping on occasion.

Gardner's material and bends may be more accurate but the system is not welded. Corvette Central's system is aluminized and while bends and and material are not correct the system is welded.

If Garner's system was welded correctly I might have spent the extra but at this point neither one is TFP.

Bill

[Leo M.]

Re: 1970 lt1

You can order a carbon steel system from Corvette Central. Takes a couple weeks longer. I have purchased several complete systems from Corvette Central and they fit great.

[Michael F.]

Re: 1970 lt1

why not go to a local muffler shop and have them copy the original?

[Patrick H.]

Re: 1970 lt1

You can order a carbon steel system from Corvette Central. Takes a couple weeks longer. I have purchased several complete systems from Corvette Central and they fit great.

Not much point in this (no pun intended), as the difference in point deductions between a CC carbon steel system and an aluminized system is only 1-2 points, and the carbon steel will rust. I've installed the CC systems on several cars with good results.

[Joe L.]

Re: 1970 lt1

why not go to a local muffler shop and have them copy the original?

Michael-----


I doubt that any muffler shop on earth could copy from scratch any Corvette exhaust system.

[James S.]

Re: 1970 lt1

i wound not trust any muffler shop in my area...lol

[James S.]

Re: 1970 lt1

thanks ive looked at paragons and corvette central and the corvette central system looks better and im going with the aluminum coating