CPR head mod

[..SNAKEBIT..]

CPR head mod? do they plain all them?

got a used head and took the stock one off (need to send it to Koodat)
looked at the 2 heads and CPR looks like it was plained and all 3 rechambered to match?
the stock chamber is smooth, while the CPR is machined??
I thought they would just change the chambers, wouldnt plaining increase compression?
or do they take so much out of the chambers they need to plain to raise it back up????

 

[..SNAKEBIT..]

T.t.t.

 

[..SNAKEBIT..]

did anybody look at the head before & after Mod??
is that right they have to plain it?
I guess I will get it put on and check compression & squish

 

[MountainMax]

my bender head mod was shaved right across sealing surface, then reshaped in the combustion chambers to get the same squish area back, if this is not done, the squish area will be very small and more prone to detonation/preignition INMO

 

[..SNAKEBIT..]

you can tell the chamber's are all machined, and the gasket area has been cut ( plained )