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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

valve clearance ?'s

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Old Mar 16, 2011 | 08:42 AM
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Default valve clearance ?'s
ok so previous owner stated that my heads were milled to 11:1 to compression, couldnt present any paperwork but he did give me ever reciept for everything else on the car. ok so my question is, im gonna be running a GM847 cam with 1.6rr's, my lift will be under .600 . will i have any issues with valve clearance?? kinda looking for people that have had the same setup to chime in. the car is under the knife right now so i will find out eventually, just would like some input. Thank - Levi
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Old Mar 16, 2011 | 09:31 AM
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from my understanding duration is more important to PTV clearance than lift. either way I don't see it being a problems with a flat top piston and that camshaft.
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Old Mar 16, 2011 | 11:05 AM
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Originally Posted by myltwon
from my understanding duration is more important to PTV clearance than lift. either way I don't see it being a problems with a flat top piston and that camshaft.
awesome thank you sir!!!!
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Old Mar 16, 2011 | 11:10 AM
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I agree to small a cam to worry about it. But if any head work was done then the proper way is to clay test it. But more likly than not you will be ok
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Old Mar 16, 2011 | 11:11 AM
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ok cool. im a noob when it comes to this kind of stuff.
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Old Mar 16, 2011 | 11:13 AM
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I would check PTV clearance. You don't want to guess with that type of thing.

Not to mention, there are much better cam choices out there.
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Old Mar 16, 2011 | 11:15 AM
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Originally Posted by Matts94Z28
I would check PTV clearance. You don't want to guess with that type of thing.
im not doing the work and install, he will check everything and he should be calling me tonight about pushrod length, just was curoius and thought i would ask.
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Old Mar 16, 2011 | 11:21 AM
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I understand. If the heads were stock I would say go for it, but you have no idea how much they have been cut.

If it were me, I would pull a head and check it. Then again, you could always change your cam selection to be on the safe side. I have seen a few 230/236 or similar cars make just as much and the 306/847 cars. Not to mention the manners of the car will be much better.
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Old Mar 16, 2011 | 11:27 AM
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if the heads were milled to bring the compression just up to 11:1 I wouldn't see an issue. I have 12.3:1 SCR with a 230/242 cam with no PTV problems, but always best to check first.
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Old Mar 16, 2011 | 12:59 PM
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ok guys i appreciate the help, i will let my builder know and go from there!! just cant wait to get her back on the road
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Old Mar 16, 2011 | 02:07 PM
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you can stuff a 255/265 or something stupid big and it still wont be an issue.. lt1's are not known to have ptv problems. even with heads milled alot. spoke to llyod elliot about this many times.
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Old Mar 16, 2011 | 02:37 PM
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Originally Posted by fatlt1
you can stuff a 255/265 or something stupid big and it still wont be an issue.. lt1's are not known to have ptv problems. even with heads milled alot. spoke to llyod elliot about this many times.
awesome thank you good sir!!!
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