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Thread: Need some specs
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05-06-2006, 08:02 PM #1
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- Dec 2005
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- San Diego...Michigan originally
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Pewter- 1999 Trans Am 5.7L
Need some specs
assuming that i change the pushrods which like to bend at 6250 RPM, how many rpm can i turn on a stock lower engine. i will be redoing my valvetrain and would like to redline at 7000 RPM without anything breaking. just want to know if the crank, bearings, pistons, ect can handle that rpm. Or if you know where to get the specs that would be great too. thanks guys
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05-06-2006, 08:30 PM #2
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- Aug 2005
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- Thornton, CO
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Red Tint Jewelcoat- 2008 Trailblazer SS
Won't be worth spinning it over 6200 on the stock cam.
2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
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05-07-2006, 11:39 AM #3
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- Dec 2005
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Pewter- 1999 Trans Am 5.7L
i didnt plan on using the stock cam. im probably going to go with comp cams with a custom grind that has an operating range that reaches 7000 RPM. sorry, i wasnt very specific. i ment i was doing a complete upper half engine rebuild. just wanting to know if the lower end could handle it. thanks again
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05-07-2006, 06:16 PM #4
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Red Tint Jewelcoat- 2008 Trailblazer SS
6700-6800 on the stock bottom end shouldn't be a problem.
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05-07-2006, 06:40 PM #5
I was kind of curious myself what the bottom end could rev to but on the other hand it would be hard to have a top end good enough to make HP @ 7,000rpm.
99 Trans Am M6
SLP lid/FRA/TBB/Comp 224/224 581/581 112LSA
Comp 918s/Comp PRs/Hedman TorkStep LTs
Custom Y/Exhaust/Pro 5.0
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05-07-2006, 08:31 PM #6
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- Dec 2005
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- San Diego...Michigan originally
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Pewter- 1999 Trans Am 5.7L
that is true, but when they list the specs ont the cam, they list an "operating range". in not sure, but doesnt this mean that the engine will still be producing power in that range? the cam im looking into has an operating range of 2000-7000 RPM, thats why im asking. thanks again
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05-07-2006, 08:33 PM #7
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- Thornton, CO
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Red Tint Jewelcoat- 2008 Trailblazer SS
My cam is rated from 2200 to 6600.
Still makes plenty of HP at 6600.
But I probably won't be using that section of the powerband all that much. I will know more Wed. at the track...but thinking shifting around 6100-6200 is gonna be my sweet spot.
Revving isn't always needed to make power.
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