Quote:
Originally Posted by Blue Streak 21
Kel;
Finally was able to get to the headers and make the measurements you requested. Sorry for the delay. THe header tubes are 24" long from the flange to the collector. They are equal length. The tube diameter does change. THe first 3" is pressed into a more retangular cross section, and is 1.5" OD, and the remaining length is 1.75 OD.
Yes it would be interesting to run the motor with a carb, and I bet your right that it would be 375 square. But I'm sticking with EFI for now. I'm gonna try a new intake manifold by Edlebrock. IT's a Pro Flow XT. Looks a lot like an LT1 intake. Should flow better at high rpms.
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Jerry, the primary length of the GTS header is interesting at 24" for the 5.0. 24" is to short to make optimal power & torque at reasonable rpm (see Performance Tuning in Theory & Practice by A. Graeme Bell page 115).
This length primary for a 5.0 with the sort of cam duration we run (approx 220 - 235 deg at .050") is designed to make peak power up around 7500 - 8000rpm. The primary lengths on my headers are around 36" for this reason, to get the peak torque and hp down around 4500 - 6000rpm.
It will be really interesting to see where peak torque and hp end up when you change your manifold over. I expect that they will be at higher rpm than at present.
I must say that I am loving the torque of the 347. Corners that we used to take in 2nd gear we can now take in 3rd and the car will still step out (slide) if to much throttle is used. Makes for a far nicer package to drive. I am finding myself short shifting a lot now as there is no need to rev the engine due to the amount of torque on tap.
Kel.