L.A 360..Magnum ?

MoparLeo said
Also pre 73 heads do not have hardened exhaust valve seats for unleaded fuels. More cost on the old heads. Tons of new replacement Magnum heads available cheap. Most have thicker decks to help eliminate cracking.
Magnumswap.com - Your source for Dodge Magnum and Mopar engine swap tech.

71scamp78 said
Thanks for the input I agree. I don't get to biased on either engine. I've never ran a magnum engine except in my old ram. Great engine no issues. Makes sense to use what I got unless I open it up to find major issues which I doubt because it's a good running engine just has what sounds like after tick. Thanks again L.A. it is just wonder if I should use the J heads on it and put bigger valves or just go with some new aftermarket heads. Around 400 hp is where I wanna be ..more importantly into 7 sec 1/8 mile which should be easy lol

I pulled the original J heads from my 1972 360 truck engine and the exhaust valve seats were gone; one was sunk about 1/8" so it does happen. I'd only run them if they're in good shape and require minimal machine work since the costs of that add up really fast. On that engine I just found a set of late-70s 360 heads already rebuilt with fresh valves, seats, springs, hardware from a FABO member since it's in a truck and I'm not going for HP (the ports and casting quality were visibly worse than the older '915' heads though). Otherwise if you can swing the cash aluminum heads are by far the way to go. I'm just hearing now about this Promax deal, sounds like a good option. Trick Flows are also a great option for an assembled bolt-on head but I don't know how the price/value compares. Things are changing rapidly in the SBM world it's only been in the past 5-10 years there are more viable affordable options for aluminum heads besides the typical Edelbrocks and such.