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Author Topic:   are these good exhaust manifolds
Dirt Full Roller

Total posts: 43
posted July 20, 2003 07:49 PM  
the cast # is 14093654 RH 8 are these a good set to run in a stock class they cam off an old 350 that was in a van. thanx in advance.

Dirt Forum Racer

Total posts: 80
posted July 20, 2003 08:12 PM  
I had them on my motor also,they have the bigger outlet on them so I figured they were better. I had read some place that they were a good set to use.just figured on stock exhaust bigger is better. good luck..Jim

Dirt Maniac

Total posts: 123
posted July 20, 2003 09:15 PM  
I've got a slight problem with my exhaust manifolds. The motor I was using was a 305 and the passenger side manifold does not work with my new 350. Can anyone point me in a direction for a new set? What's everyone use for exhaust from the manifold back?

Dirt Forum Champ
Total posts: 5390
posted July 20, 2003 10:51 PM  
I think your talking about the 305 manifolds they have a differant bolt pattern on that side,if you've switched to a 350 you'll want the bigger outlets anyway. youcan get them off a chevy truck. good luck...Jim

Dirt Forum Racer

Total posts: 78
posted July 21, 2003 11:47 PM  
an easier way is to use a crayola cran(sp), the wax type. Just run a stripe dowm the exhaust pipe and where ever the crayon stops melting is where the pipes should be cut at. Thats how I have done mine for years and it seems to work great.

Dirt Forum Racer

Total posts: 80
posted July 23, 2003 08:58 PM  
BGA,on the length of the pipe were is a good starting length, our car is x braced and are limited on length and to go under the x gets to close to the ground. thanks....Jim

Dirt Freak

Total posts: 461
posted August 11, 2003 10:04 PM  
well on how far you need to run them according to brezinski you need to run nuthin smaller then 2 1/4 inch pipe and no shorter then 56 inches we run them to the side of the car under the x brace and it works fine and we have found on the dyno it does add about 7 horse power and the curve stayes more flat hope that helps you out

you never know how fast you are going when your in the lead, until you blow the announcers hat off!!!

Dirt Maniac

Total posts: 123
posted August 12, 2003 08:16 PM  
On the passenger side exhaust manifold the rear bolt hole is spaced different on a 305, kind of odd, but JB weld works great.

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