| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#21
09-15-2020, 12:34 PM
|
|||
|
|||
The cam in Joe's SD is very close to the Crane 284281.
I did a restoration SD engine featured in HPP and it made 430 HP with the same cam. Steve25: I don't think it was 90HP, but I'll check some old HO newsletters for info. definite seat 'o pants improvement.
__________________
GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
|
#22
09-15-2020, 12:39 PM
|
||||
|
||||
|
Thanks Ken!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#23
09-15-2020, 09:30 PM
|
|||
|
|||
|
The numbers that were in the 1978 HO Racing cat page 22 HO crossfire high performance muffler system. “The best factory dual exhaust for the 1970-77 Firebird is the 455 SD system. However, this system is still quite restrictive at high rpm. Drag strip tests indicate that a stock 455 SD will lose 80-90 hp through the exhaust system compared to one with open headers.”
“HO tests indicate a 30 hp gain compared to the 455 SD system with virtually no increase in noise. “ That is with the HR-93 1973-74 SD exhaust. |
|
#24
09-15-2020, 09:47 PM
|
|||
|
|||
|
Thanks for the help F K
__________________
GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
|
#25
09-16-2020, 05:40 AM
|
||||
|
||||
|
Thanks for digging that info up!
A 30 hp gain is more then a Cam change will add the OPs car assuming he keeps the motors stock 8.4 comp.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
