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RarlyL8 08-14-2011 10:45 AM

Header Primary to Exhaust Port Fitment
Thought I would share some of the observations that we see when working to improve exhaust system function/performance. Most folks are aware that the heads are machined to allow the headers to slide up inside them. This gives a really nice transition and reduces the chance for gasket burnout and mis-alignment at the port. Having the header tube just meet the head when torqued to spec is the goal. Reproducing this measurement on every primary is not easy and why I am looking at it.
Anyway you don't get to see this alignment very often so here is a picture.

CaptainCalf 08-14-2011 07:09 PM


oilonly 08-16-2011 05:57 PM

The little details.

Miguel Antonett 08-18-2011 04:08 PM

Are the spacers welded to the flanges now? I believe there is where my leak is on piston $6.

vas930 08-18-2011 04:33 PM

Nice Brian, nice.

cole930 08-18-2011 06:37 PM


Very nice buddy but I wouldn't expect anything else, you set the bar !!!!

Remind me that if you ever come to see me I need to clean my garage before
you get here.


RarlyL8 08-19-2011 07:02 AM

I posted the pic just because you don't get to see that junction very often.
The reason I am looking at this is to set tighter specs. It was brought to my attention that variance occured on the gasket protectors and there is opportunity for improvement.
Yes the spacers are spot-welded onto the flanges. If using short studs you can pop them off with a screw driver. You should have a set Miguel and if not I will send them to you.

CaptainCalf 08-19-2011 07:28 AM

Brian, is there any advantage to running the spacers? I haven't ordered any studs yet, so I can go with any size there I might need...Thanks, RC

Miguel Antonett 08-21-2011 03:02 PM

You already did, I'm good; better yet, moving back to B'ham... see ya'll.

RarlyL8 08-22-2011 04:30 AM

We made spacers to make it easier for those with long studs. If you think stock long stud exchangers will ever be on the engine again then use long studs.

I hope that is good news Miguel, we'll sure be glad to have you back!

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