Hey guys,

Just a few questions about going one pulley smaller on my maggie. I have a 2001 sierra C3 with LQ4, 112 Maggie w/ stock tensioners (new design), LT's and Corsa exhaust, LS2 TB w/ 90mm J tube and Outlaw intake, built 4l60 and 2600 stall. I am seeing about 7 #'s of boost now.

I was going to stick with the 2.9 until I put a cam in ( thinking 224/230 .612/.612 116 LSA, LEP's magna blower cam or the classic GT2-3) anyways but I keep running 13.04's and 12's would be nice!

My crank is not pinned, and I was going to hold off until I did the cam on doing this because I hear its a pain to get it all lined up again? Am going to see problems with the crank pulley spinning with the 2.8 in the mean time? If it does spin what are the consequences?

I also have a gatorback belt on there now, and do see a little belt residue by the snout so the belt must already be slipping. Should I be looking into HD tensioners? I know there have been ones that have worked and others that havent made a difference...what are you guys experiences and recomendations?

Finally...are there any comparisons on the 224/230 .612/.612 116 cam or the classic GT2-3 207/220 .571/.578 118.5 im looking into that I havent found?

PS: anyone have any 2.8 pulley's around they arent using and wanna sell?

Thanks for the help!

 

-Not sure whos telling you there are problems lining things up, but its real easy with a right angle drill...nothing to line up.. Get the right kit and it comes with a jig/bolt/bit/dowels...
-I would def use the hd tensioner just for piece of mind..def anything under 3.0
-Seems like the larger cams bleed of more boost...something to think about..The GT2-3 is a proven Radix cam...

 

Thanks for the reply,

I'm not talking about the original install of the pinning kit, but lining it all back up after the cam install...don't know why it would be a problem, but have just read things, maybe it's not true?

It is hard to go away from the proven GT2-3, and maybe i will go with that, i've just been reading on the bigger cams making more power, but I would like proof and tests if there are some, also don't know about the daily driveability?

 

I think he means putting the crank pulley back on after pulling it off and lining up the holes. It can be done just takes patience. Check out the vinci trucker cam 216/224 .551/.551 on a 115lsa. I think you would like it with the radix. It is a blower cam.

 

Vinci Trucker is a good cam as is the GT2-3. As for the crank pin, I would wait till you swap the cam because its going to be a PITA to line it all back up. Trust me, I did it.

 

Id be suprised if you arent already spinning the crank pulley. Ive got a gt2-3 in my lq4 right now and a cam very close to the trucker cam specs on the shelf to do a comparison once I get the blower on. it will be 4-5 months before I do the comparison though.

 

You NEED to pin your crank. Don't wait, you're playing with fire. If the pulley starts spinning on the crank, it usually ruins the crank.

Now, my opinion on the cam. If you're still running the stock cam, you are really holding yourself back. The trucker cam works great in a 5.3, and works good in a 6.0, but I really think the 6.0 could take a bigger cam. The LEP maggie cam you mentioned might be worth considering. But with the bigger cam & cubes, I dunno if the MP112 will get the job done.

 

IMO the valve events of the LEP cam lend better to a higher flowing compressor and lighter vehicle or looser converter. If I can find one used for a decent price Ill try it too though just for comparison sake.

 

For comparison, the setup in my signature makes 8psi on a 6.0L with MP122 and 2.6" pulley. Adding a much bigger cam to a 6.0L with a 112 on top is a total waste. One of the smaller trucker cams might be of a little benefit, but I wouldn't go any bigger.

Oh, and pin that crank today before you mess something up. As mentioned above, with a rt. angle drill, it's relatively painless

 

If staying with the MP112, I think the LEP cam is too big. If staying with the MP112, the Trucker cam would really wake up that 6.0