[cwb90]

Can someone tell me if the fit / quality of the reproduction 621 bellhousings are any good? I see Classic Ind. has a heavy duty version and regular one so I'm somewhat confused on which one to get and whre to get it from. I see ebay has a bunch listed but I'm not sure of the quality. Thanks for any help,

Clint

[zman1969]

Keisler makes a H/D alum/Titanium alloy thats CNC made and supposed to be spot on - I was planning on one of them the regular repop stuff always seems to be poor quality(fenders, quarters door panels and the like - why would a repro bellhousing be any better?)

[Steiner]

I've got the Keisler one but haven't really heard anything bad about the reproduction ones. FYI run out of the bellhousing on my Dart block was 0.0035" against a 0.005" maximum recommended but then again...new block and new bellhousing you would assume that core shift would be minimal. It needs to be checked regardless.

Don't quote me but I think the heavy duty 621 that Classic sells is actually the Keisler bellhousing. It does not show "discount exempt" in the catalog so if you can use the 20% off coupon on it that's the way to go.

[zdld17]

Got my 621 repro from Classic years back, it was beefy. Dialed in perfect within .003 compared to my old Lakewood .045. I feel just as safe using a billet flywheel without the scatter shield.

[68 Ragtop]

I have the heavy duty reproduction 621 bellhousing and it fit/functions well.

The bellhousing is a structural member of the drivetrain and I have seen quite a few original ones that are cracked, so it just makes sense to go with the heavy duty repro one.

BELLHOUSING - Keisler designed & manufactured reproduction of the 11 inch '621' bellhousing. Made in USA of high strength cast aluminum-titanium construction, 50% thicker wall construction than factory, CNC machined; available for all Chevy V8s and GM LS engines.

[rszmjt]

Originally Posted by zdld17

Got my 621 repro from Classic years back, it was beefy. Dialed in perfect within .003 compared to my old Lakewood .045. I feel just as safe using a billet flywheel without the scatter shield.

Do You? FWIW - It is not allways the flywheel that explodes, watch the vidieo link below to see what happens when a Pressure Plate Explodes.

YouTube - Death of a Trans Am

YouTube - Death of a Trans Am

[DT]

That was sick!

[re-living 68]

I bought the replacement 621 from Ground Up and it fit fine.

[Vintage 68]

Originally Posted by rszmjt

... watch the vidieo link below to see what happens when a Pressure Plate Explodes.
...

that was the Clutch Disc that exploded and took the PP with it ...
Disc explosion or failure is a much more common failure than Flywheel or PP.
Specially if a disc is abbused with bad driving habits

[Steiner]

What?! You can't do a 6000 RPM clutch drop on an old LS1 factory clutch hooked to a Z06 engine?! Must be those crappy parts GM has made in Mexico.

I remember seeing that video a while back. If a piece of it had hit the guy in the head it might've been an improvement.

[bcm66]

I saw that video a while back too. That guy was an idiot.

Scatterproof bellhousing with a block saver plate is the only way to go if you are going to race.

[zdld17]

Originally Posted by rszmjt

Do You? FWIW - It is not allways the flywheel that explodes, watch the vidieo link below to see what happens when a Pressure Plate Explodes.

YouTube - Death of a Trans Am

I don't use cheap clutches and its a new assembly at ever tear down, need it or not but I understand your comment.