[Tigers] Need help with header decision.

[Buck Trippel]

Hi Duke,

I have 3 Tigers, each with a different header/exhaust manifold.

I run the CAT headers on our race Tiger with a 289 that probably produces 
power in the range your stoker will. I have had no complaints.

The CAT headers have a tube diameter of 1-5/8" while the SS headers are 
1-1/2".

CAT headers have merged collectors while the SS don't.

CAT headers fit an unmodified Tiger. I did not have to grind a motor mount 
or anything like that. They simply dropped in. I don't own a set of SS 
headers so I can't comment on them.

The CAT headers should be test fit before coating. You may want to dimple 
the side of the tube near the flange to accommodate whatever fastener you 
choose to use. I use very small fasteners with a 3/8" head so the dimpling 
was quite minimal. A standard Craftsman spark plug socket fits fine on all 
plugs without any modification.

I've heard the torque theory before. However Alex Gabbard actually took the 
time to measure the before and after. He posted the results on this list 
last year. He compared a motor with the cast stock manifolds against the CAT 
headers. In theory the stock manifolds should have produced lots of torque. 
Instead the dyno showed that the CAT headers produced a lot more torque. 
What's the old engineering expression? All the theory in the world goes out 
the window with one good test? I applaud Alex for taking the time to make 
the comparison as well as freely sharing it with the list.

good luck,

Buck




--------------------------------------------------
From: <wsamouce at kc.rr.com>
Sent: Friday, February 11, 2011 8:47 AM
To: "Tiger's List" <tigers at autox.team.net>
Subject: [Tigers] Need help with header decision.

> Closing in on header purchase time.
>
> Would like the boardbs opinions on C.A.T. headers vs S.S. headers.
>
> I believe that the S.S. headers are a smaller diameter?  This would help 
> in
> low end torque but trade off high RPM power.
>
> I do not plan on revving the 347 over 6200 and will have the rev limiter 
> set
> at that point.
>
> Looking for experience on fit and quality.
>
> TIA!
> Duke
> B382002037
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