L92 flywheel recomendation?

[1981silverz28]

I'm helping a buddy put an L92 in his 68 camaro and need to know what flywheel to get . He is keeping the muncie 4 speed . Stock weight or lightweight ? A guy told him a lightweight revs quicker but is harder to take off with . Any suggestions?

[andrewb70]

I'm helping a buddy put an L92 in his 68 camaro and need to know what flywheel to get . He is keeping the muncie 4 speed . Stock weight or lightweight ? A guy told him a lightweight revs quicker but is harder to take off with . Any suggestions?

The flywheel he uses will also be dictated by the clutch he uses. I have an LS7 clutch in my GTO and I love it. It is heavy, but it drives very smoothly with great modulation. You have to be honest with yourself and really think about how the car will be driven. We all like to think that we have race cars, but the truth of the matter is that most cars are street driven 99% of the time.

If this will be a street car, get an LS7 clutch/flywheel and be happy.

Andrew

[garys 68]

Is it a 26 or 10 spline Muncie?
What's the rear end ratio?
What are you going to do with the car, drag racing, road course?

[andrewb70]

Is it a 26 or 10 spline Muncie?
What's the rear end ratio?
What are you going to do with the car, drag racing, road course?

Oh yeah, good points. If it is a 10 spline Muncie the LS7 clutch is not an option. The rest of what I said still applies. Don't get a "racing" clutch unless you really plan on racing it all the time.

Andrew

[1981silverz28]

10 spline Muncie and already got a centerforce clutch . 3.2? gear and gona be street driven with a couple RTTH events . I have seen the McLeod flywheel thats a little thicker and their pilot bushing . didn't know about the advantages of a lightweight flywheel or stay with a heavier steel one .

[garys 68]

3.2x is a pretty tall gear with the Muncie 2.6x 1st gear. The extra weight of a heavier flywheel will make launching easier.
I'm guessing you mixed/matched an aftermarket disc/pressure plate/flywheel.
I just put a muncie behind an LS motor in my 72 442. I used the 0.4" thicker, heavy sachs 1050 flywheel ($60), an 11" BBC 10 spline clutch/pressure plate ($110), and an LS7 pilot bearing ($15). Very economical, works great, and the early 70s 11" clutch allows for just a 26 spline disc if I swap the trans.
If you go with the thinner LS flywheel, you'll need a longer throwout bearing for correct fork geometry.

[1981silverz28]

garys 68 , he is going to use the 11" clutch that was behind his SBC. The sachs 1050 flywheel is a replacement for a 2006 chevy 5.3 truck ?

[garys 68]

An old school 11" clutch bolts to the sachs flywheel. You just have to remove the pins and enlarge 3 bolt holes on the pressure plate. That flywheel is an OEM part for some trucks with manual trans. I think it was for an 05/06 6.0 3500 1 ton silverado ($60 at Oreileys). That's the application I used for ordering flywheel and clutch bolts.
The thicker flywheel also allows for the standard 1.25" throwout bearing.
I housed it all in a 621 BBC bell housing.

[andrewb70]

...You just have to remove the pins and enlarge 3 bolt holes on the pressure plate.....

Which pins? The ones that actually align the pressure plate on the flywheel?

Andrew

[garys 68]

The holes for the alignment pins on the flywheel are not on the pressure plate. When I enlarged the 3 bolt holes, I only did it barely big enough for the bolts. Not ideal, but I checked runout at 6 places on the pressure plate and it was under 0.005. Maybe I got lucky.... my bellhousing needed 0.021 offset pins to get corrected....go figure.
https://static1.pt-content.com/images/pt/2011/07/DSCN0270-1.jpg


Which pins? The ones that actually align the pressure plate on the flywheel?

Andrew