I balancing a 383 Chevy rotating to a 29 roadster with a blower and 4-speed to a buddy here in Sweden. He came with a Eagle crank and a cast flywheel ( 168 T ) and a new pressuare plate. Shop that sold him the pressuare plate said the small ones ( 10.4" ) is better, but the case is his flywheel has a bigger bolt CC than this pressuare plate. Does anyone know where to find a blueprint of the bolt pattern/CC (?) I then can machine it in my CNC lathe. My buddy said he will do this in his garage, but I said he will only create a issue for me try balance it as he will never get it correct. I asked him to get a steel dual bolt patter flywheel but he said no, if I will not drill he will... -I can't let him do that. First time really since 1984 I had this case to a Chevy. Ideas. Centerforce Dual Friction ®, High Performance Clutch Pressure Plate and Disc Set, 529 ft/lbs Capacity, 10.4in Dia., 10-Spline, Fits Buick/Chevrolet/GMC/Oldsmobile/Pontiac Cars and Trucks 6/8 Cyl
Should be No problem @ a Machine shop, Have done a few time's year's ago free Hand , a drill press . Make Templates with hard card board paper , good Quality taps . A more precise tool to use in pic below.
Thank's, now I got correct 'search word' and found this. Flywheel clutch bolt pattern chart The 10.5" Chevy has 11.5/8" CC and short/long pair is 5.813" and it match the pressuare plate. When I has this it's to me way more simple drill/thread in CNC. If customer did this by hand punch he would just case me issues in balance and not a true center.
One never do learn.. Customer gave me the wrong pressuare plate and I said if do it the right way is replace the parts correct. I said after customers idea is was so ’easy’, Ok I will do it ( my misstake ) Well, so much I know is never let them guide you but in this case it was my hotrod buddy. After get the blueprints I got into work, but soon new problem got in. The bigger diameter cast flywheel has a edge for bolts CC in that diameter but now as a smaller diameter the holes get exact mid in that edge so if drill now the drill would ’move’ ’around’ and thread to 3.8” is not easy either in situation only half holes get a thread. Plus on backside it was older balance holes that got in even worce drill into. Anyway, I’ll could bought a longer solid metal mill ( 5 x D ) 8 mm or 0.314” and drill 1.2”. Then move it the mill rest off from behind. -Anyway its done now but it was a never again. Word is easy, get the right parts direct.
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