319-6291C heads on 304?
Slinwin8773
Jeeper
Hello all,
1st post here. I recently bought a 1979 CJ5 with a 304v8. A couple of months ago I found another engine out of a '79 jeep that was dissassembled, the block bored .060" over, mains align bored, and the crank polished. It came with new aluminum pistons already mounted to rods, an edelbrock performer intake, holley 600cfm carb, and the heads had been reworked and packaged in plastic to prevent rust. All for $400 (widowed barn find). I bought it and started buying up neccessary parts to reassemble it; hydraulic cam and lifters, hardened pushrods, arp head bolts, gasket set, valve covers, headers, etc. Well I finally started assembly this past weekend. I got the bottom end put together on Saturday and put the heads on Sunday morning. At that time I noticed that the rocker arms mounted on studs instead of the bridged rockers that I had on my engine. When I looked up the casting numbers (319-6291C) I found that these were early '70 heads from a 360ci with 51cc combustion chambers and larger valves (2.02 and 1.68 I think). The gentleman I bought this motor from told me that all the components were assembled and running at one time but everything I read says the block needs to be notched to keep the valves from hitting the cylinders. I guess my question is could the block being bored .060" over give enough clearance to run these heads? Can I put the rocker arms on and turn the motor by hand to see if the valves hit? Should I try to sell these heads and get some different heads that fit? Any advice is appreciated.
1st post here. I recently bought a 1979 CJ5 with a 304v8. A couple of months ago I found another engine out of a '79 jeep that was dissassembled, the block bored .060" over, mains align bored, and the crank polished. It came with new aluminum pistons already mounted to rods, an edelbrock performer intake, holley 600cfm carb, and the heads had been reworked and packaged in plastic to prevent rust. All for $400 (widowed barn find). I bought it and started buying up neccessary parts to reassemble it; hydraulic cam and lifters, hardened pushrods, arp head bolts, gasket set, valve covers, headers, etc. Well I finally started assembly this past weekend. I got the bottom end put together on Saturday and put the heads on Sunday morning. At that time I noticed that the rocker arms mounted on studs instead of the bridged rockers that I had on my engine. When I looked up the casting numbers (319-6291C) I found that these were early '70 heads from a 360ci with 51cc combustion chambers and larger valves (2.02 and 1.68 I think). The gentleman I bought this motor from told me that all the components were assembled and running at one time but everything I read says the block needs to be notched to keep the valves from hitting the cylinders. I guess my question is could the block being bored .060" over give enough clearance to run these heads? Can I put the rocker arms on and turn the motor by hand to see if the valves hit? Should I try to sell these heads and get some different heads that fit? Any advice is appreciated.
