Piston slap -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of J. Brady Sent: Friday, November 10, 2006 6:36 PM To: Chevelle Group Subject: [Chevelle-list] 327 question
Drove the '66 to work today, and decided to throw this question out to "the Council": My car runs great, and the 327 has an aluminum intake, speed pro 10.5:1 pistons, crane powermax cam (272/284), Comp Cams roller rockers, and freshly built camel hump heads with pinned in studs. Valves have been redone within the past 2-3 years with MAYBE 1000 miles on them, and I have new valve springs and retainers (also Crane, to match the cam). All that being said, it runs great with one small pet peave.. When I drive the car it runs flawlessly UNTIL I get to 2000 RPMs on the tach, at which point I hear a slight "chatter". That's the only way I can describe it. I've heard hung up lifters before, and that's not the noise- that's a chronic "tap-tap-tap-tap" (like 1-2-3-4). This, in my best impression, goes "dadadadadadada" in a much faster interval, thus the chatter description. It sounds like it's on the driver side of the engine, and happens ONLY at 2K RPMs.. I drop back, it goes away- I increase throttle PAST 2K RPMs, it goes away. I thought maybe it might be something bumping the dipstick or something stupid like that, so I moved the dipstick and it still happens. I don't think it's worth pulling the engine back out to check, but it's damned frustrating. Anyone have any guesses? I do not have valve guides and I wondered if it might be that I need them. Another note, I had the same noise when I had my 260/272 cam in it, which I just swapped out to the 272/284 as of this year. I thought maybe the disassembly and reassembly might make it go away (with readjustment of the valves), but it's still there so I'm guessing it's lower end noise. But from where and why ONLY at that revolution? Thanks in advance, Jim '66 Malibu ____________________________________________________________________________ ________ Cheap talk? Check out Yahoo! Messenger's low PC-to-Phone call rates. http://voice.yahoo.com
