West32
Active Member
- May 24, 2017
- 215
- Boat Info
- 1999 Sea Ray 370 EC Hardtop
Raymarine Axiom Pro system,AutoPilot,Radar,VHF,XM,Mercury Engine Gateway
- Engines
- Twin Mercruiser 8.1 Horizons with ZF Hurth Transmissions
New valve seats to bring everything back to stock specs. Stock valves, same pushrods and just because the engine is using more gas, it isn't showing that in your combustion chamber shot, looks lean as hell.
So after I got the heads back, I installed them. While looking up Torque information in the Manual I stumbled across this little Tidbit of information in the service manual - "
Rocker Arm Stud Kit
These engines use a net lash or non-adjustable rocker arm system. Torquing the rocker arm
bolt to 40 lb-ft (54 Nm) sets the valve lash. When rebuilding these engines with a net lash,
machining of the cylinder deck surface or cylinder head surface or grinding the valve seats
or valves may cause an incorrect valve lash condition. The most common problem is that
the valves will not close completely after the bolt is torqued.
The kit can be used to convert the engine from a non-adjustable to an adjustable valve lash
engine. There are 8 studs and 8 nuts in each kit. The valve lash is 1 turn down from “0” lash.
No one mentioned this in all my questions to many builders.
I bought the kit and installed them. I started the motor, Timed it, then adjusted each rocker once it warmed up. The motor has NEVER run better. Full power all the way up to WOT. Compression is 162 to 165 in every cylinder.
Learn something everyday..