I have the 706 heads on my 2004 5.3. The motor now has over 90000 miles and a 212/218 cam and my heads are fine. Not all 706 heads are bad. Just make sure you check the motor when you get it .
I have the 706 heads on my 2004 5.3. The motor now has over 90000 miles and a 212/218 cam and my heads are fine. Not all 706 heads are bad. Just make sure you check the motor when you get it .
I have found a LM4 all aluminum 5.3 from a 2003 trailblazer (vin code P), could it also have the castech heads on it or is it safe?
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