[VWNate1]

That's the later model 4 Liter one with integral cylinder head , those cracked like the devil when new , our Fleet has 10 ~ 15 trucks sitting idle for about one year when GM ran out of the original crappy castings and decided to re engineer it , none of the replacement heads ever cracked .

If you have one that runs well , fine and dandy , surely the head has been changed by now .

However , I'd not drop one thin dime on hot rodding these , just take care of it and run it until it needs rebuilding then scrap it .