| [GMCnet] RPM [message #319088] |
Thu, 15 June 2017 20:52  |
ron preston
Messages: 46
Registered: November 2016
Karma: 1
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I've got 3.70 final drive and like to cruise at about 65 this puts me at
about 2800 rpm. I've got prob 30,000 mile since my rebuild 10 yrs ago. (
she sat a lot with only drives around the block.)I have a mild cam,
headers , flowmaster. I'm just curious what should the red line be?
Every once in a while I find it necessary get in the fast lane and in the
bay area that means you better be doing a about 70-75!.
Thanks
Ron preston
San Jose
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| Re: [GMCnet] RPM [message #319091 is a reply to message #319088] |
Thu, 15 June 2017 21:22  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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You can go 4500 RPM
People that have never raced a stock 455 will say I'm crazy
Sent from my iPhone
> On Jun 15, 2017, at 6:52 PM, ron preston wrote:
>
> I've got 3.70 final drive and like to cruise at about 65 this puts me at
> about 2800 rpm. I've got prob 30,000 mile since my rebuild 10 yrs ago. (
> she sat a lot with only drives around the block.)I have a mild cam,
> headers , flowmaster. I'm just curious what should the red line be?
> Every once in a while I find it necessary get in the fast lane and in the
> bay area that means you better be doing a about 70-75!.
> Thanks
> Ron preston
> San Jose
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] RPM [message #319094 is a reply to message #319088] |
Thu, 15 June 2017 23:13 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Jim Hupy got it. With a 3:70 you'll never get there. 403 or 455. The 403 has a 1/4" large bore then the 455. ( 403 at 4.351", and the 455 at 4.126". Thus the 403 bore is to the point that there is no water passages between the cylinders. The 403 has a stroke of 3.385". And that is very close to a 350 Olds at 3.348". The 455 is at 4.25". The cam, distributor, and carb in any engine are the hart of were an engine puts out it's peak torque. And we drive torque. Not HP. Both engines put out of their peak torque under 3000 RPM at full throttle. But the peak torque rating IS NOT a red line. Red line is above 5000 for the 455. And the 403 is even higher due to it's shorter stroke. As a note. Most owners that have the 403. Have noted that the 403 pulls best in the 3000 to 3300 RPM range. Bob Dunahugh
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