That's exactly what I think it is Carl, sounds like a wrist pin or piston slap to me.
I don't recall hearing it when in the driveway, only when out on the road. Jim --- Carl Ziegler <[EMAIL PROTECTED]> wrote: > Does it only happen when under a load or can you sit > there and rev it to hear it? I would try to retard > the timing a bit to rule that out as well, just to > see... I had lifters act like that as well on a > 283, no clatter until a certain RPM, sounded like a > rist pin or piston slap. My $.02 > > ----- Original Message ---- > From: J. Brady <[EMAIL PROTECTED]> > To: Chevelle Group <chevelle-list@chevelles.net> > Sent: Friday, November 10, 2006 5:35:46 PM > 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 > > > > > > > > > > ____________________________________________________________________________________ > Want to start your own business? > Learn how on Yahoo! Small Business. > http://smallbusiness.yahoo.com/r-index ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com
