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Okay I have a pair of 3973487's. the driver side has the "x" suffix, while the passenger side does not. Is this normal? I have read the x castings have 10cc more on the intake runner. If these are mismatched, is it a huge deal? Thanks for the help!
 

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Okay I have a pair of 3973487's. the driver side has the "x" suffix, while the passenger side does not. Is this normal? I have read the x castings have 10cc more on the intake runner. If these are mismatched, is it a huge deal? Thanks for the help!
X is experimental heads. I had a set of them once...wished i'd kept them but someone offered me $400 for the dirty pair...:eek:

They should be very similar. Take them to the machine shop if you want to check on the volume of each to ensure they are the same. :D

202 intakes? Mine were out of my 72 Chevy Cheyenne. :yes:
 

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Discussion Starter #3
X is experimental heads. I had a set of them once...wished i'd kept them but someone offered me $400 for the dirty pair...:eek:

They should be very similar. Take them to the machine shop if you want to check on the volume of each to ensure they are the same. :D

202 intakes? Mine were out of my 72 Chevy Cheyenne. :yes:
Mine came with the car. The more I go thru her the more I realize the PO never visited the forum to check his work!
 

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Discussion Starter #4
Bump...my question is: is it normal that only one head has the x suffix, or are these mismatched heads?
 

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Had a set of those on a stone stock 72 rally nova with a 350 2bbl.Ive read those heads were intended for the higher hp 350s for 71/72. How my car got them was anyones guess,pops bought it new and he never messed with it. But yes 487x did have the larger runners dont know if any were ever fitted with 2.02 1.60 valves though.
 

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Had a set of those on a stone stock 72 rally nova with a 350 2bbl.Ive read those heads were intended for the higher hp 350s for 71/72. How my car got them was anyones guess,pops bought it new and he never messed with it. But yes 487x did have the larger runners dont know if any were ever fitted with 2.02 1.60 valves though.
 
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