231/237 pistons and valve contact
08-07-2007, 02:54 PM
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Staging Lane
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231/237 pistons and valve contact Well I was just wondering if anyone has had any problems with any valve contact with the pistons with the 231/237 TSP cam. I didnt know what really had happened to my car but I just took the heads off and can see some contact on the pistons. I have patriot 243 heads with the dual springs setup. I spun the motor over by hand and had no problems and the car drove great for a few hundered miles. Then it just happened. It was fine with the stock heads but happened after I installed the new 243 heads. Any ideas on what in my setup might have caused this or is it just too big of a cam? Any help thanks I am going to rebuild the motor anyways I have forged rods and pistons so it can handle a little bigger shot anyways.
08-07-2007, 08:55 PM
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Staging Lane
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any help guys I had the stock length push rods and stock rocker arms from a 99 ls1 camaro I dont know if that made a difference but I was wondering what happened
08-08-2007, 07:28 AM
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how many miles on the springs ? i would have thought that setup would clear but since you are rebuilding anyways i'm sure your aftermarket pistons have valve reliefs that will have room to spare.
08-10-2007, 10:06 AM
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i have the speed inc SI5 231/237 cam installed with stock heads.
I did not have to worry about PTV clearance when I did the install, everything is fine!
I did not have to worry about PTV clearance when I did the install, everything is fine!
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08-10-2007, 11:35 AM
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I have well over 30K miles on my 231/237 cam with no problems. If there was going to be clearance problems, it wouldn't have taken a while for it to happen, it would have happened the moment you turned the engine over. Like already mentioned, it must be a bad spring(s) or you did jump timing.
10-17-2007, 12:46 AM
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well I took the motor apart and spun some main bearings so that was the problem lol. But its back together with a few more parts installed but thanks for the help
