Magnum Heads

Alex, Most all of the heads that I've checked have been cracked, but keep in mind that they are the 92-00 heads. I guess that they are just getting to the mileage that they need service, some just for valve jobs and some for engine rebuilds. They go for 100.00 - 150.00 $ for cores around here if you can get good ones. The new heads have more material in them to help stop this problem. Some of the problems with them cracking was caused by detonation in the cylinders from the computers running them so lean, other problems was just plain bad gas. I've built a few magnum engines 3.9/5.2/5.9 and they have all had cracked heads or been repaired. Chrysler knew that they had a problem in the heads after being in service for awhile and, made some changes, as this is what the tech engineers had told me a few years ago.
As for the crate engines making this much HP this is true but that isn't to the ground this is from the engine, most chassis are in the 15-20% efficent range so when you take 15-20 % off, even the 480 hp engine your under 400 hp.


BJR Racing