John,
The 305 V-6 is a great engine in my opinion. Like all GMC V-6's, they like to breathe tho. Does yours have dual exhaust with straight thru mufflers?
Bill
Bill -- You're probably right. I just just haven't figured mine out yet. My exhaust runs from both manifolds into a single pipe and then into a single muffler that probably is not a straight thru flow. In fact, it's the original muffler if that tells us anything. The truck only has 9,500 miles on it, BTW.
