CRatcliff
Member
- Joined
- Nov 21, 2016
- Location
- Seattle, Washington
Hey All!
I'm doing some mods to the head for my 144 (F Head). Dropped it off at the machine shop yesterday and they had a couple questions.
First, the work they're doing:
Opening exhaust valves up to 38mm
Cleaning out bowls
Hardened valve seats
Unshrouding cylinders to the gasket lines
New valves
New springs 85lb/90lb rate
Possibly replacing valve guides
Milling the head to raise compression
The questions I have are:
-what should the Lifted rate be for the springs
-what is the desired compression for the head?
They're going to CC the cylinder and have me measure how far below deck the piston is, as well as the thickness of the head gasket, to calculate exactly. Advice on the best way to measure exactly how far below deck the piston is? I can snag a Harbor Freight tool, OR I have calipers if that's better.
I'm doing some mods to the head for my 144 (F Head). Dropped it off at the machine shop yesterday and they had a couple questions.
First, the work they're doing:
Opening exhaust valves up to 38mm
Cleaning out bowls
Hardened valve seats
Unshrouding cylinders to the gasket lines
New valves
New springs 85lb/90lb rate
Possibly replacing valve guides
Milling the head to raise compression
The questions I have are:
-what should the Lifted rate be for the springs
-what is the desired compression for the head?
They're going to CC the cylinder and have me measure how far below deck the piston is, as well as the thickness of the head gasket, to calculate exactly. Advice on the best way to measure exactly how far below deck the piston is? I can snag a Harbor Freight tool, OR I have calipers if that's better.