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Old 09-29-2010, 08:53 PM   #1
azvren
 
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PTV Cam Clearance?

Ive been looking at this cam but idk if it will require flycutting.

here are the specs:
Comp LSR Cam (231/239 .617/.624) 113 LSA

any thoughts on the clearence, and is it too big for stock gears and daily driving?
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Old 09-30-2010, 08:01 AM   #2
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You will need to clearance the pistons IMHO...what trans do you have?
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Old 09-30-2010, 09:09 AM   #3
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It really depends a lot on how tight p/v your confortable with & how much advance is in the camshaft. It's definitely worth checking at that large of a duration.
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Old 09-30-2010, 09:09 AM   #4
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SHOULD clear

but you should check
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Old 09-30-2010, 03:28 PM   #5
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I have the cam 1 step bigger in my LS3. I bought it from LMR in Houston. They told me it had plenty of clearance, installed it myself and I do rev it to 7200 (on occasion). So you should be just fine. BTW the lobes are almost as big as the journals

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Old 09-30-2010, 06:30 PM   #6
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Quote:
Originally Posted by SC2150 View Post
You will need to clearance the pistons IMHO...what trans do you have?
I have a manual transmission.

sorry for being a newb but how would you check for clearence? Does it require putting the cam in first to check?

Thanks for the help everyone I greatly appreciate!!
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Old 09-30-2010, 06:33 PM   #7
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Originally Posted by jrrod6410 View Post
I have the cam 1 step bigger in my LS3. I bought it from LMR in Houston. They told me it had plenty of clearance, installed it myself and I do rev it to 7200 (on occasion). So you should be just fine. BTW the lobes are almost as big as the journals

Good luck with your build
If yours cleared with a 1 step bigger cam then I'm definitely getting this cam now, thanks for the info!!
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Old 09-30-2010, 06:35 PM   #8
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Quote:
Originally Posted by jrrod6410 View Post
I have the cam 1 step bigger in my LS3. I bought it from LMR in Houston. They told me it had plenty of clearance, installed it myself and I do rev it to 7200 (on occasion). So you should be just fine. BTW the lobes are almost as big as the journals

Good luck with your build
what exactly is "one step bigger"?
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Old 09-30-2010, 08:20 PM   #9
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you can go with a wider LSA to help with ptv clearance.
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Old 10-01-2010, 12:35 AM   #10
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Originally Posted by sspaul View Post
you can go with a wider LSA to help with ptv clearance.
wider meaning a lower number like 110-112?
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Old 10-01-2010, 06:47 AM   #11
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Take a look at the cam specs for all those tested in this link as food for thought since they all cleared. Notice that none of them had as much duration AND as much lift as the cam you specified.

http://www.gmhightechperformance.com...son/index.html

The TSP 231/236 has become quite popular and matches the specs you mentioned closely.

http://www.texas-speed.com/shop/item...=1057&catid=44

Following the lead in from SSPaul, a wider LSA will also help your idle characteristics as well.
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Old 10-01-2010, 07:27 AM   #12
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The lobe lift on the cam you have specified is within tolerance and you there will not be any problems in that regard, I have the the same lift specs on my cam /.617/.624. The Duration is a little on the high side .... That's the only thing i would be the least bit concerned with and I'm not even talking in terms of PTV clearance, that's not the issue. The real issue is with the duration. You are going to lose vacuum there fore causing lack of Intake Idle Air, the car is going to want to stall when coming off the throttle before you tune it (don't worry it's fixable). You are DEF going to have to get it tuned BTW, it's going to run like POO when you first put it in, it's sounds like a monster with the lope though! I also have a 113LSA as well... with a duration of 231/235. I notice the power band has moved up with the cam. It's now between 2800rpm and 7000rpm. It starts leveling off at around 6800. You shouldn't have any problems after it's tuned, just find someone who has the patience, because this one is a BIOTCH.. =O)
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Old 10-01-2010, 09:25 AM   #13
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I never thought choosing a cam would be so difficult!
So would this cam be a safer bet then? :

Comp LSR Cam (227/235 .614/.621) 113 LSA
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Old 10-01-2010, 09:36 AM   #14
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Quote:
Originally Posted by danhr View Post
what exactly is "one step bigger"?
235/251 621/624 113LSA. Grind # 285LRR HR13.
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