I have some info on the heads I have: >>>>>>>>>>>>>>>>>>>>>>>>>>>> 350 Free Heads From Jeff Snow: "624" – 462624, used mid 70's and up on 350 engines, they came with 1.94/1.50" or 2.02/1.60" valves, had 76CC combustion chambers, DO have accessory holes, intake port volume is 161CC's, exhaust port volume is 62CC's. These heads are made of thinner castings and are prone to cracking. >>>>>>>>>>>>>>>>>>> Heads on Monte Carlo now: 33417369 are mid 90's made in Mexico Crate Motor heads. 1.94" Intake valve , 1.50" Exhaust Valve 76cc Combustion Chamber 7 Bolt style Exhaust Flange heavier castings, but Mexico metal. These are leaking anti freeze and oil at the moment, but it doesn't appear to me mixing with each other in the engine. Crankcase and radiator are both clean. Could be outside bolts leaking or the gasket itself, or a crack. >>>>>>>>>>>>>>>>>>> Tom is going to be checking the casting numbers on a set at the school that has been sitting around. Any thoughts? I am going out to the frig in the garage to get the turkey and pop it in the oven. Cindy is working almost all day today. Everyone is out of town, and she is taking care of their animals! Great day for her..... holiday rates too. JC --- John Christensen 1984 El Camino "Elkenstein" 350 TBI NECOA #042 http://www.myelcamino.net Saint Charles, IL --- John Christensen 1984 El Camino "Elkenstein" 350 TBI NECOA #042 http://www.myelcamino.net Saint Charles, IL