Hi all!

I'm closing my engine next week and I would like to know if you experts know by advance if its possible to use a milled head with stock pistons + MC (384-20) cams?
and if yes, whats the maximum I can mill?

I can measure it, but i would like to know from you guys, cuz i dont really trust my measurements!


Thx a lot,
Filipe

up!

What will you do about the slack in the cam chain?I don't think the factory tensioner will compensate for the lower height at the cam gears.The chain may have to much slack.It may cause one or the other of the cams to be out of time by a fraction of a degree.There may not be enough clearance between the valves and piston.When you mill the head the valves will sit closer to the pistons.Throw in a higher lift cam,and they push into the cylinder more.If it works and the timing chain slips or the tensioner wears,valve to piston contact could happen.I really shouldn't be awnsering this.I haven't done major surgery on the Gs engine,yet.Just going on past probs I've encountered on other projects.Really check your measurements.Compare deck height and valve protrusion from the head.I think .75mm between the valves and piston should be fine.Ask the cam manufacturer.They should have a more detailed awnser.Hope this anwsers some questions.

There will not be a problem with chain slack with the stock CCT, plenty of adjustment.
There is plenty of clearance between the pistons and valves, especially low comp stock ones. Always clay up the head to verify this.

The only time I have had a problem with clearance was with a milled cylinder and a milled head with high comp pistons and the MC cams. The clearance problem was with the sparkplugs hitting the piston and the piston was hitting the head (in the squish area) when I used a too thin head gasket. I do not know how much was milled of either the head or the cylinder. A guess would be .03-.04" on the cylinder and at least .04-06" on the head. I have never measured them and probably never will.

so do you recon if i mill about 0,02" (0,5mm) i should not have any clearence problems!?

.020" should not be a problem

Thanks dgyver.This helps me with my engine build,too.