Well I am in limbo again . Started Sat at 10:00am on the Impala worked until 5pm and surprisingly got the full drivetrain installed. Started at 10:00am Sunday and dressed it out sealed it up and started it only to find out the same clacking noise was still there. Ken Reible was nice enough to stop over at the shop and listen to the noise even watched me drive the car around the median, the thing has great power and runs and starts great except for the horrible clacking noise.. We jerked out the trans and pressure plate to confirm nothing but motor was spinning with no change in the clacking sound. we also pulled each plug wire to negate the load on the cyl`s with no change in the clacking noise. I am completely disgusted and back to square one. This motor was sent back to the builder last November after the original install was a bust for Stanon. It was completely dissasembled autoclaved and all tolerance were rechecked. Bearings were replaced and reassembled the builder found asbsolutly nothing wrong with any of the rotating assy. A 3rd set of rocker arms were installed 2nd set of lifters. Tonight we swapped out the distributor dropped the fan belt and pulled the fuel pump. Made no difference. My builder listened to the noise over the phone and has no idea were to go next. He said no reason to take it apart cause there is nothing wrong with the rotating assy. And i thought this pure stock stuff was suppose to be fun?? Any suggestions? Any one have a spare 427 thay can loan out? If you do are you up for a thrashathon I have a shop, an engine gantry, and a full hydralic car lift ??? If your local and curious I will not be yanking the boat anchor out until late tomorrow if you want a listen.. Paul
It's that 4.5" arm touching the block! :laugh: Seriously, a couple of things I've run across: Neighbor had a 350 Chev with a new replacement oil pan, the crank was touching it, small spot but made an awfull sound. I bought a 324 Olds with Jahns small domed pistons that knocked. If you looked really close a couple of the pistons were touching the heads in only one little spot. How is the wrist pin clearance? Had vehicles with wrist pin knocks that otherwise were fine. o No:
Real sorry to hear that, Paul. Your luck with these projects seems to be parallelling mine. My 66 is parked also with internal engine noise. Mine seems to be lifter related as three won't pump up. Wouldn't you know these are a one year only .921 diameter design made from "unobtainium? The 67 engine has solid lifters, so at least that problem would be solved. I have a fresh 67 Olds 442/400 race motor out back that runs 11's in a 3200# car. May have a problem with tech and have to really beef up the rest of your drivetrain to take all that rocket power. :Brow: Sorry, just had to throw that in. Spent all Fathers' Day assembling and filling one of those plastic pools in the back yard in the hot sun. Looks like a deer got in it or on it last night, as it's half drained and leaning hard to one side. Nice. I used to like deer. Want to calculate how long it takes to fill a 2000 gallon pool with a garden hose? Fortunately we don't have city water.
Pull your valve covers off, turn 'em over and take a look...I tried a repro set of covers *once*, and for whatever reason just a couple of rockers rubbed and drove us crazy for a while. I bet I ran those valve/lifters 100 times before I noticed the wear marks on the valve covers...
I've seen the same thing Rob saw before. Sounded real bad but it was only a rocker arm hitting the valve cover. Sounded like a bad main! Try that first before..................I bring the '27 from the winter beater:Brow:
Most of those things have been checked by me and donny and Ken. Except for the wrist pin which was checked by the builder. We figured pulling the plug wire on each cyl would at least change the tone of the banging if it was piston or rod related. We ran it with the covers off so I know it is not that and we adjusted the lifters and each has it`s own "tick" which we adjust out. I am at a total loss .. Paul
I personally have replaced 3 sets of rockers 1 standard set and 2 long slot sets, 2 sets of GM heavy duty 2 piece lifters. We also swapped out the distributor. engine has been dissasemmbled and checked for internal impact to all rotating components and sheet metal like the pan and valve covers,all tolerances have been checked. heads were disasemmbled and autoclaved and reassembled only problem found was the double springs on the number 1 intake valve were touching and that was fixed. Motor has been run with out fuel pump,water pump,trans,clutch,pressure plate. Any other ideas lolol.. Paul
What is the result of a stethoscope or long screwdriver to the ear? Is the noise focused in one area? Upper, lower, front, back?
iT SEEMED TO COME FROM EVERYWHERE WE MOVED LOL. WHEN WE GOT UNDER IT WHILE RUNNING IT SOUNDED LIKE TRANSMISSION THAT WAS 1 REASON WE JERKED IT OUT. WE ARE TEMPTED TO SWAP THE OIL PUMP AND DRIVE SHAFT BUT WHEN WE PRIMED IT THERE WAS NO NOISE... DEFINATLY MIDDLE AND REAR OF THE THE ENGINE i AM SUSPECTING... PAUL
Had that happen on a coupla cars. Most recently on the Ramrod with the ARP bolts protruding through the crank flange and contacting the tin inspection cover.
it sounds like there is an extra lobe on the cam slapping the block :error: just absolutely maddening........ hopefully the forensics on the block will reveal something the engine builder missed.
Run It!!! It's either gonna go, or it's gonna blow! Just kiddingou: Sorry to hear about your little problem, hope you figure it out, or bring it to Martin and let Tim thrash on it there:Smarty:
Thanks for all the input guys and thanks to Donny for helping me at the shop , Casey for offering his shop, Brian and Ken for stopping by and giving advice. Seems like we all concour it is in the upper end rear passenger side,cyl 6 and 8 area. Brian won`t rule out a wrist pin noise he really thought it was in the upper intake area possible a lifter bore. Ken had the same thoughts about the lifter bore. Reguardless it is coming out first thing tomorrow morning and heading directly to the engine shop. Not the guy who built it either. So we will see whats happening soon I hope. If it is a simple fix I may still make it . Cross your fingers and I will report soon as I know something. Paul
I can't believe the engine builder said to put miles on it! ou: Just to let folks know who have not heard it, it is really loud. :shock: Other than sounding like a Demo Derby engine in the final heat it runs great! :laugh: No offense Paul, Good luck with the inspection.
Lifters pumping up OK? I have 3 on my 66 that aren't. That's why I'm back to running the Ramrod. Good luck, hope you make it.
Another thought...which engine block & cam are you using? The early bbc's required a *grooved* rear cam journal (versus a smooth journal) or else the the rear most of the top end won't oil...yes, I found out the hard way!
