Engine outa balance

[70 ls6 convert]

A friend of mine just bought a 1968 camaro with a big block 1990 454 ,4sp.The problem is is has a vibration in the engine ,Im wondering if it has the incorrect flywheel,I got the casting off the flywheel they are # 14096805 thanks for the help...

[VintageMusclecar]

Kris;

The 6805 flywheel is listed for 1991 and newer 454 and 502 applications. I don't know if there's a balance difference between the earlier engines and the 1991 on up engines or not. Did you check to make sure the engine has a counterweighted balancer?

Eric

[70 ls6 convert]

Not yet, il go look,what do i look for on the ballencer.thanks for the help

[MosportGreen66]

It might be the pilot bearing where the tranny fits into the motor. I think its called the pilot bearing. Also check to see if the driveshaft is balanced. Sorry for being a little vague, but I'm recalling a conversation I had with my engine builder.

Good luck.
-Dan

[VintageMusclecar]

Kris;

Look on the back side of the balancer in the recess by the timing cover--you should see a fairly noticeable counterweight cast into the hub of the balancer.

Look at this eBay auction (http://cgi.ebay.com/ebaymotors/454-BBC-CHEVROLET-CHEVY-8-GMC-HARMONIC-BALANCER_W0QQcmdZViewItemQQcategoryZ34202QQihZ001Q QitemZ110095686168QQrdZ1) at the top of the picture and you'll see the counterweight.

Eric