Wondering if anyone has tried the new '65/'66 Tri-Y Headers from Paul's Automotive Engineering that are billed as a larger header that looks original--and are advertised as adding up to 35 HP? If you haven't tried them, what do you think of the following:
They're practically dead-ringers as far as looks go--once installed, they say you'd practically have to take a micrometer to be able tell the difference from the top. See if you agree from the stats below:
The original Shelby header had 1 1/2-inch primaries with two 1 3/4-inch secondaries with 2 1/2-inch collectors.
Whereas, the new Paul's Automotive Engineering header has 1 5/8-inch primaries feeding 2-inch secondaries and 3-inch collectors.
A test done on the owner's '65 GT-350 (although it is now a 347 engine) yielded the following: Without the headers the car produced 341.7 rear-wheel horse-power and 343.8 rear-wheel torque on the dyno. With the new headers, those numbers spiked to 377 rwhp (at about 6000 rpms) and 365.5 rwtq (at about 5000 rpms) for an increase of 35 horses and 21.7 lb-ft at the tire.
After studying the comparison table, I culled these figures for more "normalized" driving: At 3500 rpms without the headers, the car produced 206.6 rwhp and 310.1 rwtq. With the headers, at 3500 rpms the car produced 218.6 rwhp and 328.1 rwtq.
Now here's the bad news: these headers sell for $900--so I was wondering if by these stats if you all feel there would be a noticable difference--or do you feel the $900 be better spent elsewhere on the engine?
I'm competing in Concours Driven, so I'm after the stock look--also wondering if you think they'd slide by as far as the the primaries are concerned up top?
Incidentally, all of this can be found in the Feb/03 edition of Mustang Monthly page 36.
Looking forward to your comments. Thank you to all in advance,
Neil
They're practically dead-ringers as far as looks go--once installed, they say you'd practically have to take a micrometer to be able tell the difference from the top. See if you agree from the stats below:
The original Shelby header had 1 1/2-inch primaries with two 1 3/4-inch secondaries with 2 1/2-inch collectors.
Whereas, the new Paul's Automotive Engineering header has 1 5/8-inch primaries feeding 2-inch secondaries and 3-inch collectors.
A test done on the owner's '65 GT-350 (although it is now a 347 engine) yielded the following: Without the headers the car produced 341.7 rear-wheel horse-power and 343.8 rear-wheel torque on the dyno. With the new headers, those numbers spiked to 377 rwhp (at about 6000 rpms) and 365.5 rwtq (at about 5000 rpms) for an increase of 35 horses and 21.7 lb-ft at the tire.
After studying the comparison table, I culled these figures for more "normalized" driving: At 3500 rpms without the headers, the car produced 206.6 rwhp and 310.1 rwtq. With the headers, at 3500 rpms the car produced 218.6 rwhp and 328.1 rwtq.
Now here's the bad news: these headers sell for $900--so I was wondering if by these stats if you all feel there would be a noticable difference--or do you feel the $900 be better spent elsewhere on the engine?
I'm competing in Concours Driven, so I'm after the stock look--also wondering if you think they'd slide by as far as the the primaries are concerned up top?
Incidentally, all of this can be found in the Feb/03 edition of Mustang Monthly page 36.
Looking forward to your comments. Thank you to all in advance,
Neil
