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Author Topic: H-pipe and how far back from headers  (Read 1949 times)

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2ndgear

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H-pipe and how far back from headers
« 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.
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machoneman

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Re: H-pipe and how far back from headers
« Reply #1 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!
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Bob Maag

Cyclone Joe

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Re: H-pipe and how far back from headers
« Reply #2 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
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machoneman

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Re: H-pipe and how far back from headers
« Reply #3 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.
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Bob Maag
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