BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Lets Talk Headers... One More Time

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Cadet57

Cadet57

Posts : 4481
Join date : 2010-03-14
Age : 31
Location : Chicopee, MA

PostSubject: Lets Talk Headers... One More Time   Sun Jul 28, 2013 8:37 pm

And here's my last question. The motor is out of a 91 C1500, but its a Goodwrench replacement crate. When selecting headers, do I need to buy ones specifically for the trucks or can I buy ones for the fullsize cars? Or, in other words, do the trucks and cars use the same header port?
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Ironfistdog

Ironfistdog

Posts : 2140
Join date : 2011-01-11
Age : 37
Location : Warren, MA

PostSubject: Re: Lets Talk Headers... One More Time   Sun Jul 28, 2013 9:03 pm

ALL SMALL BLOCK CHEVY'S HAVE THE SAME EXHAUST PORT SPACING 1955+ including LT1.
You need to pick headers that fit the cars frame. So buy a set for the wagon, doesn't matter what the engine came out of as long as it's a SBC.
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Cadet57

Cadet57

Posts : 4481
Join date : 2010-03-14
Age : 31
Location : Chicopee, MA

PostSubject: Re: Lets Talk Headers... One More Time   Sun Sep 01, 2013 1:00 pm

Ironfistdog wrote:
ALL SMALL BLOCK CHEVY'S HAVE THE SAME EXHAUST PORT SPACING 1955+ including LT1.
You need to pick headers that fit the cars frame. So buy a set for the wagon, doesn't matter what the engine came out of as long as it's a SBC.
So I have the motor here, finally. Took off one of the exhaust manifolds. Has square port heads. Do I need square port headers or can I use these B-body round ports?

http://www.summitracing.com/parts/hed-68600/overview/make/chevrolet/year/1991/model/caprice
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Ironfistdog

Ironfistdog

Posts : 2140
Join date : 2011-01-11
Age : 37
Location : Warren, MA

PostSubject: Re: Lets Talk Headers... One More Time   Sun Sep 01, 2013 1:18 pm

It will be fine. You may have a little overhang over the ports but nothing you would notice on any 350 you plan to build.
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Cadet57

Cadet57

Posts : 4481
Join date : 2010-03-14
Age : 31
Location : Chicopee, MA

PostSubject: Re: Lets Talk Headers... One More Time   Sun Sep 01, 2013 1:20 pm

Ironfistdog wrote:
It will be fine. You may have a little overhang over the ports but nothing you would notice on any 350 you plan to build.
The gaskets should seal that up though, correct? Planned to get the Percys Seal-4-Good
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Ironfistdog

Ironfistdog

Posts : 2140
Join date : 2011-01-11
Age : 37
Location : Warren, MA

PostSubject: Re: Lets Talk Headers... One More Time   Sun Sep 01, 2013 7:51 pm

Overhang meaning the header flange will hang over the ports a little, for racing purposes or higher performance demand it would cause turbulence, but for a street driven car with a mild build you wouldn't even know the difference.
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