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  #31 (permalink)  
Old 09-19-2013, 08:06 AM
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good example of a front end that is a big problem is 1967 and earlier chevyIIs. The lower control arm flexes and toe changes to the point that the front tires scrub when the nose is high

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Old 09-21-2013, 12:31 PM
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Ok. I got a little side tracked there. Back to the question at hand.

Headers. So I'm Gona go 1 3/4 primaries with a 3" collector. My question is about header flange. My cylinder heads have a D port shaped opening. Should I get a D port shape flange or just go with a round 1 3/4 flange?? Is there any real benefit going with a D shaped flange??

Also F bird mention something about a more modern header flange with better sealing capabilitys??
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  #33 (permalink)  
Old 09-21-2013, 01:00 PM
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1/4 inch thick straight flange. Make sure it is flat and straight so it will seal better.
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Old 09-21-2013, 01:38 PM
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Quote:
Originally Posted by vinniekq2 View Post
1/4 inch thick straight flange. Make sure it is flat and straight so it will seal better.
Ok. D port or round?
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Old 09-21-2013, 03:20 PM
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I would match the ports.The flange should be slightly larger
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Old 09-28-2013, 01:13 PM
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I've been doing some looking around and saw a flat 4 into 1 collector. Is there any performance disadvantage to going this route ? While I could probably make a standard collector work, it would be nice to go with a flat style as I only have 4" between the cylinder head and frame rail and a flat collector would make it a Heck of a lot easier to build/install etc.
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  #37 (permalink)  
Old 09-28-2013, 01:24 PM
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are you going to use oval pipes under the car?
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Old 09-28-2013, 01:31 PM
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are you going to use oval pipes under the car?
You mean after the collector?? The collector I saw looked like the 4 primaries merge flat into a round collector..... But I could be wrong
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  #39 (permalink)  
Old 09-28-2013, 01:40 PM
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look up Nascar exhaust systems
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  #40 (permalink)  
Old 09-28-2013, 04:32 PM
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[QUOTE=F-BIRD'88;1795482]You can use a round header entrance on a D exhaust port just fine.
The mismatch at the exhaust port flange actually helps reduce exhaust reversion.

I don't see how using a 4 into 1 flat collector will aid space clearance close to the cylinder head as the collector
on a long tube header is down near the transmission, not near the cylinder head at all.[/

It would be more for removing and installing the header. While the collector will be down by the trans it still has to pass between the head and rail to be installed .... Unless I build them with the mind set of installing them from underneath ..... Which is not a bad idea lol!!! Thx F bird.
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Old 09-28-2013, 05:34 PM
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Originally Posted by F-BIRD'88 View Post
You install the headers when installing the engine. Most car's require at least lifting the engine up off the motor mounts to R and R the headers. Get used to it.
Lol!! Yeah I guess I'll have to.
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