Mark,
How all this factors into the small block Ford, I don't know:
Not relate to the Tiger, I did reply to this list as a general regard to
headers vs stock manifolds - on a Mopar 360, 300 HP Crate motor. In that
test the stock manifolds from even a lowly 318 were compared to the best TTI
headers (about $800) and there was only about 10 HP difference at slightly
above 5,000 RPM. Mopar's also have a special 340 performance manifold that
aren't cheap either (about $400). These only added about 3-5 HP and were
actually down in the lower RPM's. All stock manifolds has a 24" extension
attached at the time of the test.
http://www.moparmusclemagazine.com/techarticles/155_0307_mopar_crate_engine_exhaust/pictures.html
Click on the Dyno Sheet at the end of the article.
A-Body Mopar's have steering box, torsion bar clearance issues and many
elect to go with the stock manifolds. I have a warmed over 318 in a '73
Valiant. I used the stock manifolds, but I did all I could to improve their
flow.
Anyway, your question seemed similar to something I had previously posted
and if it was what triggered your memory I wanted you to have this info as a
reference.
Tom
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