Jump to content

Performance Cam for 8.1 Engine


Recommended Posts

Posted

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.

Posted

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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Posted

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:

Posted

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...

Posted

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:

Archived

This topic is now archived and is closed to further replies.

  • Latest Articles

  • Posts

    • Notes 7/18/2026   3,400 miles on this batch of Mobil 1 Euro 5W40 since the GDI pump replacement. Alcohol runs very clean when ring seal is tight and the sump isn't getting hosed with fuel. Checked oil level at fill up today as is my practice and grabbed a white Kleenex to look at the color. What color?  I was going to change it but.....  
    • 4 low is really nice on steep boat ramps. 
    • Interesting, I suspect I would have fueled up in Lee Vining as the day prior I would have filled up either in Laughlin or near there and maybe again before I entered Death Valley and once out the other side late that evening as I kept on driving into the night up near Lee Vining. Next morning I most likely fueled up in LV before heading over Tioga Pass into ( as I refer to it as "Yose .... Mite" 😁 ). And again that was 19 years ago but the price then must not have jumped out at me like the 5 bill a gallon theme of nutty cult hippy country Big Sir or head so far up their rear Aspen. I'd be curious to know where the highest prices are in the lower 48, I probably would not be far off to guess somewhere in Cali forn ie. Coldfoot and Prudhoe bay may have those prices beat but that is a whole other world up there and when prices are more normal elsewhere that is about what they can be up there I believe in no mans land. Anyway interesting that the 395 corridor is hosing people and the thing is, its tourist season and its not like there are a lot of competition options when driving up that highway from what I could see. Yup, big ole Boaterhomes and various other RV's ahead and behind me at the Yosemite entrance gate and they have to get their fuel somewhere.  
    • Those can be high, as well as the big California cities. The ones that will pop your eyes out are the 395 corridor on the Eastern side of the Sierra Nevadas. Lee Vining, $7.19 for regular and $8.89 for diesel is what the Google said right now.
    • Correct.  2019-2021 model years are serviced by a different p/n.  19420611.  Recall 2021s use 19420611.   The recall engines 2022-2024 model years are serviced with 12740076.     The difference between 19420611 and 12740076 is GM changed injector size for 2022.  The injectors are smaller on 12740076 with smaller injector bores in the cylinder heads to match the smaller injectors.  So you can't install a 19420611 in a 2022-2024, and you can't install a 12740076 in a 2019-2021.     Both engines are the replacement engine p/ns that are in the L87 recall.  So both of these are the updated engines.     Here's a version of the L87 recall with the p/ns for all the parts needed.    RCRIT-25V274-7075.pdf   Note it shows 19420611 and 12740076 with an asterisk to a footnote "Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which part to order if two or more part numbers are listed for the same part, as it may vary by vehicle options."    
  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...