4P 6.5mm Exhaust Valve Guides Select Engine:Honda K Series and 1/4" NPT vacuum holes

and 1/4" NPT vacuum holes

While porting changes the size and shape of the ports

and tool steel wrist pin

We do typically keep these in stock

It increases the seat pressure more than 20 psi on the seat to help control valve bounce and will allow safe operation up to and beyond 9000 rpm

4P 6.5mm Exhaust Valve Guides Select Engine:Honda K Series and 1/4" NPT vacuum holesSet of 8 Exhaust Valve Guides for 6. 5mm Valve Stem. Precision machined in house at 4 Piston on our Mazak Syncrex Swiss Lathe to tolerances you will not find from guides made by others. These are made from premium AMPCO 45 material. Honda K Series Honda B Series VTEC