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Performance Cam for 8.1 Engine


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#1 496Cubes

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Posted 29 October 2003 - 10:43 PM

Has anyone tried putting a different cam in their 8.1 engine? I was wondering how big the gains were and if there were any issues with the computer programming. I was thinking of looking into the marine engine cams or what's offered from Comp Cams:

8.1 Comp Cams

If someone knows where to look for others who have tried this or where there's more info on this please let me know. Thanks.

#2 Chris97K1500

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Posted 30 October 2003 - 12:10 AM

Tbyrne has a comp cam in his 8.1L Silverado HD. Might want to get in touch with him. Chris
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#3 richards_gst

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Posted 05 November 2003 - 12:17 AM

Any one else have one of the comp cams in their 8.1l? Any one know the stock specs of the original camshaft in the 8.1l? After many failed email attemps to different places, and a few trips/ calls to gm dealers I am not sure that anyone has it.... Please some one help!!!! I had the original part number but I lost it, will try to find it again and post it. PLEASE SOMEONE WITH A HOOK UP AT GM HELP ME.


I want the specs for my desktop dyno program!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

#4 Wingnut

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Posted 05 November 2003 - 12:27 AM

I'm not sure of the specs on the cam....But I would think that a good set of headers, and P/P the heads.....Then let Westers update your chip again.....would do quite a bit of good.

Just my .02, but I would get rid of its asthma and get it breathing a lot better before you start trying to push the air uphill with a cam.

Like I said....Just my .02. :cheers:
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#5 richards_gst

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Posted 05 November 2003 - 12:36 AM

yea thats the plan I just like to simulate it on the computer... fun while I dream.

#6 richards_gst

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Posted 05 November 2003 - 12:44 AM

GM PART # 12556291
CATEGORY: Engine Camshaft
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $326.95
OUR PRICE: $186.36
DESCRIPTION: CAMSHAFT

Here is the part number and cost from gm.. Someone help...

#7 Wingnut

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Posted 05 November 2003 - 01:27 AM

Some good cams here, if you have the patience to look through them.

Here is Banks in agreement with what I said. :sleep:

Tbyrnes Comp Cam specs.


I'm still looking for the actual specs. I'm sure someone knows them (or where to find them) and will be of more help than me on this one. :cheers:
2006 IBM M6 GTO (CLICK MEEEE)
All that and a bag of chips. 532 RWHP, 503 RWTQ.
2007 Avalanche Z71
Bone stock.
2010 Toyota Camry. No pics because BLAH!