Shims under Liner

[glenng]

At my advanced age I'm still a rookie at building motors. I have a new .67 Greenie with .017" head clearance. I ordered a couple sets of shims from Steve Wood. One set for under the liner and one set for the head button. I understand if you shim under the liner the port timing will change. What I'm working with is a Velasco hull that is not overweight and balances 1/2"behind sponson transoms. Plan to set clearance @ .012 Any comments would be helpful.

Thanks,

Glenn

 

[SayMikey]

Sounds like you are there,I have found the more you mod a scale engine the harder it is to finish. I run my 67 greeny at .017 and a long pipe setting 12 1/4 to 1/2. Comes off the corner and pulls most of the way down the straight. Dont over prop it or run lean these motors love fuel. 5/32 tank lines and big tubing

 

[SayMikey]

If your on facebook you can see this video. Watch how hard Speedy comes off the corner. The video was taken by someone watching Dave Sandel run his Valcun my old Elam. https://www.facebook.com/photo.php?v=887737967907525&set=vb.100000139915270&type=2&theater

 

[Brian Schymik]

Agree w mike. Greenie doesn't need any timing changes for scale

Very forgiving and easy to needle the way it is. I like 16-17 clearance using Keeley head gauges.