Taijutsu

I was going to order up some 2.5" RHs to replace my 2" smoggers.
I noticed these while browsing.

http://www.speedwaymotors.com/Tru-Ra...olds,3823.html

These are obviously a little different.

Can anyone take a guess on how they will fit on my 74?

If they are not an improvement, I will go w/2.5 stk
and do a little grinding before I put them on.

TIA

R

7T1vette

I would go with the 2.5" factory manifolds, so that it will still 'look' stock. But, if the 'stock look' isn't that important to you, that looks like nice set.

speedreed8

there's also these from McJacks
http://www.vetteheaders.com/servlet/...rvette+Headers

Taijutsu

Does anyone know the size of 2.5" RHs?
How do they compare w/specs of the 1.375" True Rams?
I want to at least open up the RHs to match my TFS heads.
Then I'm off to the dyno. LOL

jb78L-82

McJacks:

DucatiDon

+1 for McJacks.....

71scgc

+2 for McJacks

oldalaskaman

it would be good to find out if they had any clearance issues, ac compressor/alt./heater/acbox, they may cook those, but they look good

2Quickrides

If you're set on the stock look of manifolds, look into some of the circle track stock car engine builders. Quite a few make good power through either manual or acid ported ones. Still not as much flow as headers, but the best you'll get with manifolds for sure.

gcusmano74

By 1974, the stock ram's horn manifolds had 2" outlets. The early 327's had a 2 1/2" outlet. But I think Chevrolet changed to a 2" by 1967 or so.

tfi racing

For those who like to waste a pile of money for very little gain...

http://www.castheads.com/corvette_systems.php

2Quickrides

Not saying I would ever do it. Lol. Headers are one of the first mods I do to EVERYTHING.

Taijutsu

I think that going from the 2" RHs to the stk 2.5" RHs will be my best bang for the buck.
Since they will be a straight swap w/old RH, no fabrication will be needed.
I have heard stories about how hard the RH gets after years of heat/cooling cycles. I would like to open these up a bit, perhaps with
a sharp stone ofsome kind. No carbide cutters available.

Now the only question is: How much HP/TQ will I gain?

Any thoughts?

R

redman76

What size is the rest of your exhaust system?

Taijutsu

My 74 has stk 2.25" duals, w/ H-pipe added.
Stk cheap mufflers too!