Just doing exhaust, Intakes were done last year, I thought I could get away with regular valves on exhaust and lost the battle...

1.88" mine measure 5.36 long and are 3/8 stem

We have only used the Manley Inconel exhaust valves. No proof that they are any better than others, but we have never had a failure in 20+ yrs and I am afraid to switch. :eek: