Head Difference

Are all the heads used with the CA20e's the same throughout the years? Any differences between the solid rockers arm and hydraulic rocker arm head?

I need to service the head on my race car, the #1 intake valve beat itself in the valve seat. I have several heads from different year cars, and one head with hydraulic rockers, are they the same? Are the valve springs the same for the different years and the solid and hydraulic rockers?

Thanks,

Todd

Not sure of the head difference between the years, but I know that the later model springs are being used on earlier model engines due to them being stiffer.

MKI are solid lifter (like all the CA18ET's), but MKII are hydraulic...

Both style heads can be bolted up to any of the cylinders, but I believe the internals are different other than the valve springs. That is part of the reason why you can not put the after market heads on the MKII CA20's...

All of my heads are factory heads. So the after market heads are modeled after the MKI heads? What are the year ranges for MKI and MKII's, and what internal differences do the two heads have?

The differences are in the valvetrain.

Mechanical vs Hydraulic, take your side.

CONS
Mechanical - can be noisy, need adjustment
Hydraulic - pump up and "float" at high RPM (as in stop lifting), heavy, get stuck, not adjustable (stuck with a dowel)

PROS
Mechanical - noisy (motors with mechanical just sound more "business"), adjustable (you can run a beefy cam), don't float, less weight (power robbing)
Hydraulic - no need for periodic adjustment, quiet

The MKII (86.5-88 ) CA20Es came with stiffer valve springs due to the change over to hydraulic.

Thanks for the info.

What bolts need to be replaced when rebuilding a motor. Some cars have stretch bolts for the head and con rods. These stretch bolts should not be reused, any of these type bolts in the CA20e? If there are stretch bolts, if the bolts take the torque, then they should be all right?