#21  
Old 09-15-2020, 12:34 PM
KEN CROCIE KEN CROCIE is offline
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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.

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  #22  
Old 09-15-2020, 12:39 PM
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steve25 steve25 is offline
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Thanks Ken!

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  #23  
Old 09-15-2020, 09:30 PM
formula kid formula kid is offline
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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  
Old 09-15-2020, 09:47 PM
KEN CROCIE KEN CROCIE is offline
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Thanks for the help F K

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  #25  
Old 09-16-2020, 05:40 AM
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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.

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