Heads/Cam CTS-V Runs like crap 1 day after install
12-17-2010, 07:43 PM
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Heads/Cam CTS-V Runs like crap 1 day after install So I just had Stage 2 L92 heads and a Pat G cam installed with long tubes a few weeks ago. I was stoked on the #'s it put down (439/375) but the next day it took a dump on me. So i dropped it off to the mech. that did it as a side job. He has had it over 2 weeks and ive gotten impatient on getting it back. Maybe someone can help me point him in the right direction?
It came down w several codes
Map code
bank 1 & 2 running lean
and #7 and #8 misfiring.
It came down w several codes
Map code
bank 1 & 2 running lean
and #7 and #8 misfiring.
12-18-2010, 11:31 AM
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I wish i knew what the issue was. It happened when i was shifting from 2nd-3rd, i may have also hit the 7k rev limiter. After that it had a dead miss and was barely drivable
12-19-2010, 06:22 AM
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Does your cam pull all the way to 7k rpm? If not, then revving it to 7k isn't going to net you anything. Might have been valve float at that rpm. What kind of valve springs are you running? I may be wrong
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12-20-2010, 04:52 PM
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Yeah, some people are lucky when they over rev but he unfortunetly was not, plus the stock pushrods dont help, Stg 2 heads could have been mill'd plus the size of that cam u better make sure all your ducks are in a row
Last edited by Ravenous T\A; 12-27-2010 at 11:09 AM.
12-27-2010, 08:18 AM
#16
I was about to ask if you had stock pushrods in it.. I've done the bent pushrod thing before. Stock pushrods cannot handle the additional stress of aftermarket springs. I bent 4 of them at a 15 degree angle during a 7000rpm stint.. Luckily I didn't smack any valves.
01-05-2011, 04:40 PM
#20
Assuming it was an LS2, since you are using the L92 heads, was the PTV checked after the cam installation? Any valve reliefs cut into the pistons?
That big intake valve can run awfully close with flat tops with some grinds. This, compounded by the wet noodle stock pushrods, can produce a catastrophic combination.
That big intake valve can run awfully close with flat tops with some grinds. This, compounded by the wet noodle stock pushrods, can produce a catastrophic combination.
