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FE Power Forums => FE Technical Forum => Topic started by: 2ndgear on April 09, 2016, 05:29:59 PM

Title: H-pipe and how far back from headers
Post by: 2ndgear on April 09, 2016, 05:29:59 PM

1969 mustang,4 speed,FE stroker engine,hooker headers,3 inch exhaust,GV. I installed a GV and I had to cut the old H-pipe to make room for the overdrive. I am wondering how far back from the headers I should install the new pipe. Thanks in advance.

Title: Re: H-pipe and how far back from headers
Post by: machoneman on April 09, 2016, 05:45:34 PM

The general rule of thumb is to do so as close to the collector as possible. I agree with this principle but in a mufflered car I really don't think it makes a lot of difference where it goes. JMO!

Title: Re: H-pipe and how far back from headers
Post by: Cyclone Joe on April 09, 2016, 07:36:16 PM

Not sure how scientific it is, but I have heard people shoot a bit of spray paint on the pipes, and then install at the location where the paint no longer burns off.
Joe

Title: Re: H-pipe and how far back from headers
Post by: machoneman on April 09, 2016, 08:02:18 PM

Yes, but that trick only works with open header engines equipped with slid-on or bolt-on collector extensions.

Using a wax crayon works even faster after drawing a long and wide horizontal mark on the extensions . After a few runs, the exhaust heat leaves a nice line literally showing one where to cut off the excess tubing. But with a muffled exhaust all bets are off.