The Force Awakens...

Holley 4-bbl parts are easy to come by.
Q-jet great but need lots of tuning parts, hard to come by especially in Belgium.
 
The Primary emulsion circuits are perfect matched for cams stock to 280 Advertised cams.

Limit will be had at 290 -300 advertised.
HP series or Race Carb needed.
Q- jet only a Factory RAIV Q-jet or SD455 Q jet will only work right.
 
Race hot cams need a Super Rich AFR at all times.
Danger Zone Rpm. 7 k plus.

For the money new or used a Holley Street Avenger on the Street can not be matched.
Its an idiot proof Holley carb.
 
The front control arm bushing are clearly perished. I am postponing doing an alignment job until that is sorted.

I find the car to be uncomfortable to drive at 60 mph. I am not sure what it is.

You did say the bushings are toast. I'm a bit confused .... is this a handling problem or sound type problem you are feeling?

The timing tab on the OEM cover is about an inch away from the harmonic damper. Could this damper be too small for the application?
Were you able to confirm TDC? There are a few different locations for the timing pointer, do you have the right one?
http://garage.grumpysperformance.com/index.php?threads/timing-tabs-and-indicators.1015/

http://garage.grumpysperformance.co...op-dead-center-1-for-timing-ignition-cam.966/
 
Last edited by a moderator:
Sorry. It’s a vibration of sorts.

The muffs are actually touching the body.

Ugly !

5F080D8E-A7EC-4F4B-942B-008BAEB9635A.jpeg A513A9B0-4B12-458A-9525-8B87B761EC72.jpeg B407CAB4-7C13-4E10-A8D5-EFC4D82FA3E2.jpeg
 
having access too a decent MIG or TIG welder, a floor jack and a lift or 4 12 ton rated jack stands,
too move brackets and exhaust pipes would come in as a useful option, and yes a compressor and die grinder might be useful,
but Id be very very reluctant to start clearancing to gain the room vs making the required changes,
to the component parts being used, or too move the exhaust components so they don,t touch or rub, on the frame or body.

http://garage.grumpysperformance.com/index.php?threads/high-flow-quiet-exhaust.10558/

http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

http://garage.grumpysperformance.com/index.php?threads/building-an-exhaust-system-for-your-car.1166/

http://garage.grumpysperformance.co...abricating-sidepipe-headers.13159/#post-68643

http://garage.grumpysperformance.co...on-side-pipes-picture-heavy.12702/#post-65193


HINT!! HINT!

some bolt on accessory's ,
used on the correct application,
just look really nice, and ENHANCE the visual appeal.

cutega1.jpg


corvsider1.jpg

index.php

C3%20Corvette%20Header%20LS.jpg
 
Hmmmmm. I feel the vibration in the wheel and stick shift.

I think I’m going for start by removing the fan. It seems to me the vibration is worse now that I did the timing cover swap.

The mufflers are definitely going to need to be addressed
 
Is it possible that that contact between the body and the muffler is creating all this vibration?
 
Bottom dropped out in the C3 Corvette world.
Muscle era 1968-1970 worth the most.
If Define by Pontiac Muscle era its 1959- 1974.
1971 C3 Still worth decent coin.
Market sales dictate.

Right now after 1971 typical value is 1500-3500.
No telling when its coming back up.

Just Pro Tour failed.
Market correction going on with 1975-81 Trans Ams too.
Pro Toured converted now worthless also.
 
Well, I pried, pushed and tighten as best I could to clear the body. I also removed the fan as I suspected it could not be centered.

4665CCE8-8A3D-438D-B202-3B6D72F662A2.jpeg

It’s not perfect but it really is a significant improvement.

Now accelerating to 60 and 70 is comfortable. Staying there less so. Maybe because of the loud muffs?

There is still a vibration but it’s not as bad.

I’m thinking new damper, new motor mounts and maybe a look at the clutch...
 
One muff still a bit close and possibly bumping. I’ll tweak that tomorrow
 
Right-O !

I think we may have found the vibration source... the TWIN vibration sources.

I took the Corvette out for another drive this evening and found that the vibration seemed a bit intermittent - seemed to be RPM related but also more pronounced at certain speeds... I also noticed that the source of the vibration seemed to move around... including coming from behind me !

Up on jack stands I found that middle of the exhaust pipes were bumping or in contact with the bottom of the car.

Tomorrow I will mess with it a bit and see if I can get some clearance there. If that changes the problem, hopefully... we are there !!!
 
pictures that point out the issue and any changes you make, as usual would be great
 
Hmmmmm - the trans mount !!! replacing it must have raised the pipes at leas 1/2 inch... the mount was completely worn down !
 
Back
Top