Any of you guys have access to mechanical drawings showing the location of cyl head bolt/stud holes and alignment dowel holes ? Other machined dimensions (valve centers would help also) of the head would be nice but this will get me started.
I have cadillac head blueprint. 18.670 from intake manifold dowel centerline to locating dowel hole at other end of head. Also 18.880 from ex port valve guide centerline at intake dowel end of head to same locating dowel hole. Distance between dowel locating holes is 20.359 to 20.361 I personally would measure a factory head for dimensions if I didn't have the blueprint.Very challenging indeed. I already have addressed the intake port face issue with the heads, now I have to correct the dowel pin hole locations. They were not even close and way oversize. Looked like they were drilled using a broken drill bit in a drill press with bad spindle bearings. I will ream them, plug them , then drill and ream to correct size and location to fit standard block dowels. At least one head stud hole on each head needs to be spot faced. On a Cadillac head the angle of the intake port face is supposed to be 90* to the deck. Mine were off to were there was a .062" gap at the bottom . If some one where to bolt on an intake manifold they would have a massive vacuum leak and probably be sucking oil into port from lifter valley. I have seen this many times on manifold swaps. I have no desire to call and attempt to get warranty issues handled. The shipping and time involved even if they agreed to send me a set of correctly machined heads puts me off. Any how I am going to finish the corrections make notes and post on here for others that might use the info. When I was racing full time I won many races and several championships I never held back info or help to others . Many were customers of mine some were not. I made money from the shop not so very much from the racing prize money. When they won I won. I will shut up and go back to my corner now.
Hey 48 Austin. I have a recently built (lastyear) 4.400 bore x 4.420 stroke Hbeam 6.750 chrysler rod bearing rods 7/16 arp bolts. CadCompany forged pistons 10-1 compression 76cc heads 2.25in 1.8ex stainless vlvs. HowardsCams Springs for Mech roller cam 272in 276 ex .720 lift intake .680 lift ex.compcams endurex lifers Manton pushrods Setup for T&D rocker assembly. Grooved cam bearings. No T&D with engine. 8quart pan .875id pickup tube bushed lifter bores aluminum vlv covers with breathers. custom Twisted wedge A460 intake fabricated to fit Cad500. Dominator flange. HEI distributor/ wires. $5000.00 firm! You can use that SBC in the Austin to start it with!But for the same price fully worked over iron heads. I don't have the means to do or know how to do the work myself.
Hello Gordon. When the Potter rocker arm assembly arrived for my Boogieman cylinder heads I found out the the hold down studs didn't fasten the girdle section of the assembly to the cylinder head separately from the rocker shafts. On T&D rocker assembly for iron head cadillac cylinder heads there are 7/16 studs with 7/16-20 thread for a nut that holds down the girdle section to cylinder head at factory rocker locations. On the Potter assembly the 7/16 stud had one shoulder with a 3/8-24 threaded area to hold the rocker assembly as on unit. I determined that 3/8 material wasn't going to retain the rocker assembly to the cylinder head during use. I copied the T&D hold down method by buying the studs from T&D for the iron head. I also bought counterbore cutters from Travers Tool Company to facilitate maching the Potter girdles to install the 7/16-20 studs. You can get Travers catalog sent to you from their internet site. I'd have mentioned this sooner but only recently remembered it.I think they are sold with the idea of being nearly ready to bolt on ( I always do a disassemble and clean of anything I get) mine were not due to the issues I mentioned earlier. They are the only game in town . Maybe if these issues are mentioned to them at purchase time they can take care of them before shipment.