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Author Topic:   Exhaust Manifolds
DeanHensler
Dirt Full Roller

Total posts: 46
posted November 27, 2005 03:46 PM  
My track rule says you have to run cast iron exhaust manifolds. What kind are the best for a 350? I've heard the Rams Horn type are the best, but really hard to find. Anything else?

Steve Dupree
Dirt Freak

Total posts: 350
posted November 27, 2005 03:56 PM  
Hey dean just search that subject it has been answered several times before. That way you dont have to wait for a answer.

DeanHensler
Dirt Full Roller

Total posts: 46
posted November 28, 2005 02:13 PM  
I did some searching and it looks like a lot of people run truck headers.

How about a set of TPI Exhaust Manifolds off a 1985 z28 5.0 HO (high output 305)?

If I plugged all the air holes that the TPI uses would these be a good set?

DJR22
Dirt Maniac

Total posts: 128
posted November 28, 2005 05:45 PM  
There is some good info on the Brzezinski site. The 2.5 inch ram horns are the best, but over priced. As far as log manifolds, the early 327 is supposed to be better. You can read it for yourself at www.castheads.com

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-stand on it-

DeanHensler
Dirt Full Roller

Total posts: 46
posted November 28, 2005 06:22 PM  
What about something off an early 90's Camaro Z28 or a Formula Firebird? I would think these would be designed to flow as good as a 60's corvette, wouldn't they?

Normal Sullivan
Dirt Full Roller

Total posts: 58
posted November 28, 2005 10:36 PM  
Dean: Do your track rules say anything about port matching on exhaust? I'd think there was power to be gained there no matter which manifold you use.

uintyracer
Dirt Roller

Total posts: 9
posted November 28, 2005 11:50 PM  
quote:
Originally posted by DJR22:
There is some good info on the Brzezinski site. The 2.5 inch ram horns are the best, but over priced. As far as log manifolds, the early 327 is supposed to be better. You can read it for yourself at www.castheads.com


Go to www.A1auto.com. They have new 2 1/2 inch ramhorns for 75 bucks apiece


DeanHensler
Dirt Full Roller

Total posts: 46
posted November 30, 2005 12:29 PM  
I can port the exhaust however I want. Just has to be cast iron manifolds and I noticed a rule that said "No Center Dump Type Manifolds" So the Rams horns are out. What about this set off the 85 Z28 305?

DJR22
Dirt Maniac

Total posts: 128
posted November 30, 2005 12:51 PM  
I believe the manifolds from a z28 will be the same as off anything else from that era. But if you got em, hog em out and see how they work...it's worth a try.

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-stand on it-

DeanHensler
Dirt Full Roller

Total posts: 46
posted November 30, 2005 12:56 PM  
I can buy them for $40. Yes or no?

James Ott
Dirt Maniac

Total posts: 151
posted November 30, 2005 04:34 PM  
Dean I got mine on ebay $15.00 pair. some guys around here are running them

DeanHensler
Dirt Full Roller

Total posts: 46
posted November 30, 2005 04:40 PM  
quote:
Originally posted by James Ott:
Dean I got mine on ebay $15.00 pair. some guys around here are running them


Are you talking about the Z28 or the Rams Horns?

James Ott
Dirt Maniac

Total posts: 151
posted November 30, 2005 04:47 PM  
the Z-28's The only thing i didn't get was the heat riser. I'm going to try and cast weld the air tube holes

Koolaid
Dirt Maniac

Total posts: 103
posted November 30, 2005 09:44 PM  
You may have better luck with the air tube holes tapping them and plugging them.

James Ott
Dirt Maniac

Total posts: 151
posted December 01, 2005 05:06 PM  
Well thanks but I have fixed alot of marine exhaust manifolds. They split from being frozen. I use UTP #8 rod and have had absolutely incredible success. That rod is like magic once you learn to weld with it.

James Ott
Dirt Maniac

Total posts: 151
posted December 01, 2005 05:07 PM  
By the way does anybody know if the center dumps work on a metric. Is there any clearance issues?

DeanHensler
Dirt Full Roller

Total posts: 46
posted December 01, 2005 06:49 PM  
quote:
Originally posted by James Ott:
By the way does anybody know if the center dumps work on a metric. Is there any clearance issues?

Yes, there is clearance issues, but you can have a muffler shop weld your exhaust pipe on a little higher than where the rams horn pipe ends and bend it backwards. They will fit then.

john56h
Dirt Roller

Total posts: 8
posted December 04, 2005 03:34 PM  
Chevy Pickup and Suburban from around 1987 has a cast iron log manifold that accepts a good sized outlet pipe (can't remember whether it's 2-1/4" or 2-1/2").

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