what are the differences in both heads, better valvetrain, cams, springs, etc? thanks for all the input. ive heard the cams are better in the 2.2 heads, but not really sure. thanks again

 

From what I have actually seen in person, the retainers are heavier in the 2.2 head.

 

Good question.

I know the duration is different because of the different rev limits and vtec engagements. The retainers are said to be stronger, and theirs a few other differences.

 

so F22 head fit F20?

 

yeah the heads compliment each other as far as fitting goes.

 

Yes, it fits. The part numbers are the same. The differances are as follows

AP2/AP1 Part description
Cams Both
14120-PZX-A00 14120-PCX-000 CAMSHAFT, EX.
14110-PZX-A00 14110-PCX-000 CAMSHAFT, IN.

Valve Springs Both
14762-PZX-A01 14762-PCX-003 SPRING, EX. VALVE
14761-PZX-A01 14761-PCX-003 SPRING, IN. VALVE

Retainers
14765-PRB-A01 14765-PCX-000 RETAINER, VALVE SPRING

 

I was told the F22 has weaker valve springs. Can anyone confirm?

 

I can't.

 

Something crazy...

At the 2007 Tokyo Auto Salon the Spoon Civic "Type R" is running with K20A head/F20C block...

 

^^^
are you sure you don't mean F20B?