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I am thinking of putting Thorley Headers on my 1968 302. The engine has a Edelbrock Manifold, Holley Carb and Mallory Electronic Ignition. I don't want to sacrifice low end torque for upper end horsepower. Has anyone dynoed a mild 302 wth long tube headers? What is the torque increase/ decrease at say 3,000 rpm's? 4,000? Thanks for the input.

Stewart A. Smith
1968 Cougar XR-7
 

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I have heard nothing but good things about Doug Thorley headers. I believe that they are made from heavier steel. I don't know what type to get, but their tri-y's sure look good.



Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat

http://albums.photopoint.com/j/View?u=1571478&a=11942550&p=43703435.jpg
 

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If your car has the stock cam in it you should stay with a small size tube header.
The larger the tube the farther up the rpm scale your torque will be. Long tube
headers work great if you stay under 1 3/4" primery tube size. 2" is for the big
motors. Most 289-302 headers come with 1 5/8" tubes. Thorley is a very good
header. If you have single exhaust now you will notice a big jump it performance.
Good Luck!
 
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