Re: 502/502 GM crate -- Lemons Header Message Board

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Subject: Re: 502/502 GM crate

Author:
dan lemons

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Date Posted: 05:43:34 05/15/02 Wed
In reply to: janes c. 's message, "Re: 502/502 GM crate" on 04:33:22 05/15/02 Wed

>>>We have a 502/502 GM crate, with a performer
>RPM+950HP
>>>Holley, bumped up 10.0-1 compression,229/236
>>>duration-569/587 lift Hyd roller, in a 3600 lb
>>>chevelle 30 inch tire, 3.89 rear,and the converter
>>>flashes at 4250 rpm. It runs 10.7/123 mph now. the
>>>heads are stock GM 502 alum. This is a street legal
>>>car,but it is mostly raced.Trying different shift
>>>points, it runs best shifting at 5300. What do you
>>>think would be the best header combo, with and
>without
>>>3.5 inch mufflers. Please, No ground dragging on the
>>>street.Also, any other help on getting this closer to
>>>the NINES. WE've thought about a NOS system, any
>help
>>>would be nice.

Hi Janes, thanks for the e-mail. A 2 1/8" stepped to 2 1/4" with a 4" collector should work well with your current set up and up to 300 Hp nitrous added. Our collectors with the transition cone inside will also help performance through whole power range. Is your tire a 10 1/2" width? We have 2 headers for this chassis. One is all inside the frame, but will not fit power brake booster and has 1 low tube, if your car is real low. The other has 2 tubes on each side that go around the frame, it will fit power brake booster, is easier to install and has excellent ground clearance, but you will have to alter your fender wells. Thanks again, Dan Lemons.

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