materman, if you want more hp have your block bored and honed with a torque plate,put new pistons(cause you have too) and you will gain about 30 hp and your engine will last a long time if you do this,when you bore and hone your block this way your bores will be round under the torque of the head,and finish the bores with a 625 stone(sunnen) your rings will last, your engine will have more hp! when people bore and hone blocks without a plate they make the bores round, but when your torque your head on they go out of round and thats why people hone blocks with a rougher stone to make rings seat in.i have seen about .003 out of round when you dont do this and thats where the hp goes, you must have ring seal and valve seal to have a nice engine that last and runs like you want it to for a 6 cyl.hope this helps
Just about no one does this. Pricing/sourcing a torque plate for these engines will tell you why. IMO exhaust is the first place to start, then cam, carbs, etc.
