chichm wrote:
Sedona wrote:
Does anyone know what is the correct internal diameter to ream newly pressed in valve guides on a 1275 head to?
Cheers
.280 or .281"
Close...
Actually, it's 0.28125", aka 9/32".
Get a solid reamer, not an adjustable one. The running clearance needed is built into the valve stem diameter.
NEVER fit bronze guides without reaming the suckers afterwards- they close in during fitment, and can grab your valves. Results are not pretty.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
