I didn’t do anything as large as a flywheel, but in my JC shop cl*** we got graded on making bolt circles on the mill using a rotary table. Like @ekimneirbo showed. Hardest part is locating the rotary table. Tap, tap, measure, tap, tap, measure, etc. once done, watch the marks on the table to set the first hole, then watch the marks on the rotary table and spin and bore holes. Dang I wish I had that shop and tooling at home! edit: meant to mention we used to have one machine shop in Modesto that still was all manual machines, owner would look at the part, what you wanted done say it would take “x” amount of time and give you a cost. No CNC set up fees, etc. I haven’t been by the place since the pandemic. Not sure if they’re still in business still.
Considering the cost of machine time for redrilling, plus resurfacing (probably necessary when changing clutch disc sizes), possible shipping or driving expenses, the new flywheel ($306) that Lloyd suggested should be considered. However, read the reviews as some of them seemed to be made wrong:
IF you have the 8ba and a half bell. If you increase the pressure plate and clutch friction diameter from 9.5'' or 241mm the pressure plate will hit the half bell - if you go to 10.25'' or 260mm then the pressure plate will touch also a point worth noting the later flywheel with the 6 points at 60 degrees for the 241mm clutch uses a smaller bolt thatn the bigger clutch. or you will need to get 6 bigger shouldered bolts for the early pressure plate did this yesterday 8ba stamped half bell later 6 holes on 60 degrees flywheel the 260mm pressure plate bolts up as does the 260mm friction disc the half bell touches the rivets on the multi fingered pressure plate luckily, a 23 spline 241mm clutch exists and i am pretty positive it fits the flywheel drillings as i know a v6 camaro does and they are 9.5'' or 241mm also /\ that gives you the 26 spline clutch at 1 1/8 for a camaro v8 t5
My dad (Toolmaker for GM for 39 yrs) did my 8CM flywheel on his drill press in his ba*****t. I was pretty impressed. Man, I miss that guy.
https://kyclutch.com/ They did a couple Cadillacs for us, perfect work, fast turn around, very knowledgeable people there. Rebuilt, resurfaced and balanced our pressure plate, new disc, got it on a fri aft, shipped it back the following Tues. Work was perfect. $125 about 2 yrs ago. Shipping from MI was 60 bucks each way. Fort Wayne wanted $550 for the same job, 2 to 3 week turn around estimate. Any questions?
As others have said, any machine shop should be able to handle this. When I was adapting a T% 5spd with GM bellhousing and clutch to my Packard straight 8 I just took the new pressure plate and my Packard flywheel to a machine shop and asked them to redrill it. I picked it up a couple of days later. I can't remember what it cost but it wasn't much. Good luck with it
Since u seem to b an ***hole either learn how to use a phonebook or learn how to use a drillpress. Either ones pretty fukn easy.
I would prefer to do it with a rotary able. less math and generally more accurate. I knew a guy once that had drill fixures for various and used a hand drill. I doubt that it was as accurate as he claimed but that was how he did it.
Couple things to consider........ If the flywheel you have needs resurfacing, then its best to get it done by a clutch rebuilder who has a machine specifically designed for reconditioning the large flat face of the flywheel and have them redrill it for you at the same time. If the flywheel does not need resurfacing but only needs a new bolt pattern, then virtually any local machine shop can do it and you save the shipping. A regular machine shop will have a milling machine and can drill the pattern. They most likely won't have a "Blanchard" grinder which can be used for flywheels. Some automotive machine shops "may" have a Blanchard or a flywheel grinder for resurfacing. If there is any doubt about the condition of the flywheels face, get it reground or your clutch may start slipping before too long. I have recommended Ky Clutch in the past and I'm glad to see that others who have tried them have been happy with their service. They also make dual friction performance clutches. 502 955 9173 (No I'm not related to them, just became friends with them over time.)
Bleil Machine on Jackson St in Mentor can do that job easily. If you like call me,Bert Kollar, at 440 974 8887 and I will meet you at Chan's shop and explain it to him. He is not a car guy, he builds trains and machines a lot of BIG fasteners. He also has a forge shop, foundry and a half dozen milling machines he can do this on.He will do it for beer money.
The Jalopy Journal
