different heads on block

[cyrus_the_great]

i have two different heads on my 350 chevy

14079261 (unknown chamber) 1.94 1.5 valves and another one 376445 76cc chamber small valve


can it be cause of bad mileage ?

 

[cyrus_the_great]

 

[DoubleV]

Yes.

 

[RITTER]

It honestly shouldn't matter too much, in your case ... the 376445 is a 1980-84 350 truck head with 1.72/1.5 valves and a 76cc chamber and the 14079261 head is a 1982-88 350 truck head with the same size valves and combustion chamber size. The heads may flow slightly different, but not enough to have a great affect on your mile per gallon.

 

[cyrus_the_great]

It honestly shouldn't matter too much, in your case ... the 376445 is a 1980-84 350 truck head with 1.72/1.5 valves and a 76cc chamber and the 14079261 head is a 1982-88 350 truck head with the same size valves and combustion chamber size. The heads may flow slightly different, but not enough to have a great affect on your mile per gallon.

my research about 14079261 says different size for valves >> 1.9 1.5

 

[RITTER]

My information is from my Chevy SMALL BLOCK RELEASE 3 (factory part & casting number guide) last update 1999 ... it could be time to get a revised edition 😳