the only differences i see is upgraded valve springs.....i belive it says it uses different valve sizes but all the ones i see is 1.90/1.60 which i belive is standered, does anyone know the true differences in this head from the other. Most people here dont use the competition heads do they?
There is no "option" to upgrade the valve sizes in the 165 heads. If you want a bigger valve, you're going to have to cut the seats or move up to a bigger head.
The 1.90/1.60 combination is more than enough in size.
There is no "option" to upgrade the valve sizes in the 165 heads. If you want a bigger valve, you're going to have to cut the seats or move up to a bigger head.
The 1.90/1.60 combination is more than enough in size.
maybe u misunderstood me, the reason i mentioned the valve was because
http://www.airflowresearch.com/pages/165sbf_sh.htm
if u scroll down to "Basic Package Components" it states "Intake Valve, 1.900” stud mount, AFR #7200 Comp PKG #7203" the 2 part #'s led me to belive they were possibly different sizes althought it doesn't look like it, i was just asking whats so different about those heads
maybe u misunderstood me, the reason i mentioned the valve was because
http://www.airflowresearch.com/pages/165sbf_sh.htm
if u scroll down to "Basic Package Components" it states "Intake Valve, 1.900” stud mount, AFR #7200 Comp PKG #7203" the 2 part #'s led me to belive they were possibly different sizes althought it doesn't look like it, i was just asking whats so different about those heads
When you get the spring upgrade on the AFR165's, you also get a valve change, but not bigger in diameter, it is longer or shorter (can't remember which) because the installed spring height changes.