do I have a Gen IV big block? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

longbedrick · 12-20-2009, 01:41 PM

Assuming my 1973 GMC 454 is all stock, is there a good chance that I have a Gen IV 454 motor? Seems like there is a whole lot of variation. 2 bolt, 4 bolt. oval port, square port, peanut port. oval large, oval small, oval standard. rectangular head. standard head. open chamber, closed chamber heads. can all this be cleared up by the casting #'s? I'm just trying to buy an intake manifold, and I'm getting all these promts at Jegs and Summit

12-20-2009, 01:41 PM	#1
longbedrick Registered User Join Date: Nov 2009 Location: Gilroy,CA Posts: 193	do I have a Gen IV big block? Assuming my 1973 GMC 454 is all stock, is there a good chance that I have a Gen IV 454 motor? Seems like there is a whole lot of variation. 2 bolt, 4 bolt. oval port, square port, peanut port. oval large, oval small, oval standard. rectangular head. standard head. open chamber, closed chamber heads. can all this be cleared up by the casting #'s? I'm just trying to buy an intake manifold, and I'm getting all these promts at Jegs and Summit



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.