head milling effects???

[89sdac]

I have a 2.2 (TII) cb 8v bored .040 over with forged Wiseco pistons. My head has been milled twice giving me a total .016" off of the surface. Will this leave enough clearance for my valves? Will it have much effect on my compression? Will it effect my compression enough to cause damage on factory boost (12 psi, rarely spikes), fuel, and electronics?
My only fuel tweak is a Walbro 255 high pressure (in tank) pump.

[89sdac]

*Same factory head that came with the motor by the way. Just thought I'd add...

[Directconnection]

Wiseco claims in their piston info sheet that their valve notches are machined slightly deeper to compensate for head/block decking (to make them flat again)


But, on my T-III Wisecos, I noticed the valve notches were a bit shallower (around .010), yet the compression height was less than stock (about .010 again). So, on mine, they equaled out the same I guess.

I wouldn't worry too much about the .016" unless running a reground performance cam.

Anyone know what the valve to piston clearances are on an 8v T-II, and on the 16v T-III? (have yet to mock mine up as I wait for the crank to be reground....)

[Spraynlog]

If you want to put it back to normal compression, Felpro makes a copper shim to compensate for head milling. They are about $20, I think I got one at NAPA.

[turbovanman²]

if you want to put it back to normal compression, felpro makes a copper shim to compensate for head milling. They are about $20, i think i got one at napa.

+2. :d

[89sdac]

The gasket I bought for it is a Mopar Performance stock-thickness gasket. Will there still be a good seal with a shim? I also wanna be sure that future boost increases won't be a problem with the milling and/or a shim. If a shim won't effect my performance at all, then that would be great! Thank you both for replying by the way.

[Force Fed Mopar]

At what point does milling the head affect the cam timing?

[4 l-bodies]

At what point does milling the head affect the cam timing?

Rob,
I put together quite a few motors and I always degree the cams in. There are really too many variables to definitively give you a #. Some Fidanza cam pulleys I've measured were made 4 degrees off by themselves! Factory cam sprockets can be off a couple degrees as well. Camshafts certainly can be ground incorrectly and be off by a couple degrees. Crank sprockets too. Resurfacing the head and deck of block will retard cam timing. Add these all up and if all going the same direction, it can be significant.
For example I put together a guys 2.2 motor. Had one of Menegon's cams, the incorrectly made Fidanza pulley, both head and deck were resurfaced .006 each. The cam was so retarded I ended up having to advance the cam 8 degrees to get the cam at it's intended installed centerline! I ultimately advanced the cam one full tooth so I had some adjustability left on the fidanza pulley. That is not typical, but you can bet if the head and deck has been cleaned up (like in a rebuild) you can bet the cam will be retarded 2-3 degrees. That is at least what I have found to be common.
Hope that helps answer your question,
Todd

[Force Fed Mopar]

Yeah pretty much, we've been playing w/ it a bit in DodgeZ's CSX, which has a pretty milled down head, it was having some issues we thought may have been related. Seems it was actually something else, but the cam definitely needs to be set right anyway.

[turbovanman²]

The gasket I bought for it is a Mopar Performance stock-thickness gasket. Will there still be a good seal with a shim? I also wanna be sure that future boost increases won't be a problem with the milling and/or a shim. If a shim won't effect my performance at all, then that would be great! Thank you both for replying by the way.

AS long as you coat the shim with copper spray, they work fine. I used one for a few years at 30 psi, high etc's and all around abuse,

[89sdac]

Do you coat the copper shim on both sides with copper spray? I bought Permatex Copper Spray-A-Gasket btw.

[Juggy]

just run the MP headgasket....i thought they were .030 or .060" thicker then stock??

so i wouldnt worry about it

[minigts]

Yeah pretty much, we've been playing w/ it a bit in DodgeZ's CSX, which has a pretty milled down head, it was having some issues we thought may have been related. Seems it was actually something else, but the cam definitely needs to be set right anyway.

hehe Rob, Kevin and I had that same discussion last night! Man, I had no idea that cam timing was as critical as it can be. And apparently the roller cam with a square tooth gear can adjust cam timing as well. Why can't they just make stuff easy?!?

[Force Fed Mopar]

hehe Rob, Kevin and I had that same discussion last night! Man, I had no idea that cam timing was as critical as it can be. And apparently the roller cam with a square tooth gear can adjust cam timing as well. Why can't they just make stuff easy?!?

Lol I know right