O.C.Barry

I'm in the process of installing a ZZ4 engine in a '70 4 speed convertible. Has anyone done this before? It looks like we can use a Z06 flywheel if we remachine the two bolt holes by the pin hole. Pressure plate looks fine. Clutch has to be replaced by a coarse splined 12" clutch.

Any thoughts?

1970 Dave

Check the archives--a member( I forget who now--early Alzhimers) did a wonderful detailed post on the exact thing. :yesnod:

Sigforty

I put a zz4 into my 71 coupe, and I used a flywheel GM sold.
this is the flywheel I used GM# 10105832 http://www.paceparts.com/product.asp?0=287&1=289&3=247

theandies

Ok, I admit it, it was me........link in my sig.

Good luck, great engine :thumbs: :thumbs:

19Shark69

I did the ZZ4 installation in my 69 Coupe. I had to purchase the flywheel from GM. I dont remember the pn. I had the 355hp model. I had to work with the water pump too. It didnt quite fit, so I had to do some grinding. Other than that, it was pretty easy. I really like the ZZ4.

Steve

O.C.Barry

Thanks for the info.

So do I understand correctly that with the GM flywhell 10105832, I can use the old style 11" clutch and pressure plate?

flynhi

Do a search for lightweight flywheels that recently ran. It seems that a light weight FW can give you some additional performance.

garandfan

Here's the new ZZ4 in my 70 vert. Use the GM 168 tooth flywheel set for 12 spline, and you'll mate right up to the muncie. Use your bell housing, but save your self some time and hassle get a new centerforce clutch assy. and install a new, longer clutch fork ball stud (1 3/8 min length) BEFORE you put it all together!! Don't do like I did and have to pull the tranny to rework the ball stud and clutch linkage.

O.C.Barry

Do you know the part number of the long 1-3/8 ball stud?

Forgive my ignorance, but what is a 'center force' clutch assembly? Is that a brand name? I prefer to stick with the stock GM parts, I drive my Vettes very gently. Now my '38 Cigarette Top Gun, that's another story; 1500 HP supercharged and it ROLLS!

Thanks, Barry


[Modified by O.C.Barry, 12:58 PM 5/19/2004]

Sigforty

That GM flywheel will use old style clutches. Just make sure when you order a clutch you have the spline count on the input shaft correct. I had a centerforce clutch on my car before, but changed to a Hayes street/strip clutch when I install the zz4 and it works great.

O.C.Barry

So do I need to change the pivot ball if I use the stock old style clutch and pressure plate?

Thanks, Barry

theandies

No - but get a new ball stud and fork......I'd rather change out the fork now then wait until one of the old tired fingers breaks 2000 miles after you get everthing going.

O.C.Barry

Thanks, I appreciate the info!

Barry