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Old 07-29-2016, 09:04 AM   #1
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Best Cam for PI Swap on NPI Short Block

The title pretty much sums up the question lol. I'm looking now to do a PI swap on my 1997 GT, and I want to know what's the best cam I can run without getting any piston-to-valve clearance issues. I'm aware with that setup, the PTV isn't very high, but I've been seeing different answers, from "don't run anything but stock," to only stage 1, to even someone saying Hitech Stage 2 cams. Which is the real best? Also, I'm going to be adding a nitrous shot so I have to consider that as well


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Old 07-29-2016, 09:09 AM   #2
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Well if the block is out of the car you may be able to have the pistons cut for larger valve reliefs.

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Old 07-29-2016, 10:41 AM   #3
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Best Cam for PI Swap on NPI Short Block

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Originally Posted by sigmanx View Post
Well if the block is out of the car you may be able to have the pistons cut for larger valve reliefs.

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Yup, the block will be out of my car. Would cutting the Pistons for the clearance lower the compression ratio?


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Old 07-29-2016, 11:59 AM   #4
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Very Slightly but not enough to really make any difference.

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Old 07-29-2016, 02:55 PM   #5
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Very Slightly but not enough to really make any difference.

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Well that sounds promising then. For the sake of argument and curiosity, if I don't notch the Pistons, what's the option then for cams?


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Old 07-29-2016, 03:06 PM   #6
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Given that the pistons won't have as much of a dish and the valve is still located in the same location you would still have the normal ptv issues and possibly more with a npi block. I honestly don't know I would go more than stage 1 with a proper degree job.

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Old 07-29-2016, 04:47 PM   #7
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Comp Cam xe268ah, or CMS "stage 2" are your best bet. The dish doesn't matter at all since the clearance issue is at the edges. You would have the same clearance with stock pistons and flat tops.
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Old 07-29-2016, 04:48 PM   #8
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Yes that is possible with the piston notch.

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Old 07-29-2016, 04:49 PM   #9
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Properly set up 268s or CMS stage 2s won't need valve reliefs. It is extremely tight, but its been done.
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Old 07-29-2016, 04:51 PM   #10
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Ya I'm sure it's doable with someone who really knows their stuff but I'm a what if type of person!

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Old 07-29-2016, 07:23 PM   #11
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Notch the Pistons while its out. Then throw some CMS stage 2 cams in there and call it good. Or you can get a set of clearanced stock valves and do it that way. The later might be cheaper.


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Old 07-29-2016, 10:48 PM   #12
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Swapping for clearance valves also allows for a valve job on the head as well since its out.

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Old 07-30-2016, 01:20 AM   #13
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I have the hitech stage 2's in my 01 gt, been in there for 40,000 miles now and I love them. They work well with boost too, my car is procharged.
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Old 07-30-2016, 04:53 PM   #14
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I have the hitech stage 2's in my 01 gt, been in there for 40,000 miles now and I love them. They work well with boost too, my car is procharged.

Well these all sound like good ideas. I'm not sure I want to mess with the Pistons. If I were, I think i would just go to extra mile to get better Pistons, and at that point I would just get forged internals. If Hitech stage II work without any piston modding I'm set on that


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Old 07-30-2016, 04:56 PM   #15
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If your not interested in pistons or notching them since you have it out anyway I would at least do the modded valves so you don't have to worry about any ptv issues especially since your doing cams anyway and it's not much more work on top of what your having done.

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Old 07-30-2016, 05:00 PM   #16
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Quote:
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If your not interested in pistons or notching them since you have it out anyway I would at least do the modded valves so you don't have to worry about any ptv issues especially since your doing cams anyway and it's not much more work on top of what your having done.

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The valve job I can do. Something about notching the Pistons seems off to me, only because I feel as if something would just get screwed up in the end and destroy stuff, knowing my luck


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Old 07-30-2016, 05:01 PM   #17
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Sounds like a plan to me! I want cams too but it will be a while before that happens!

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Old 07-31-2016, 02:17 PM   #18
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Well these all sound like good ideas. I'm not sure I want to mess with the Pistons. If I were, I think i would just go to extra mile to get better Pistons, and at that point I would just get forged internals. If Hitech stage II work without any piston modding I'm set on that


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My motor has never been opened up other than installing the cams. I didn't even change valve springs with the hi tech stage 2's. Threw a blower on at 100k and it now has 122k on it and shows no signs of engine wear, been making 430 to the wheels for 5 years.
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