Topic: 22R Hybrid valve clearance issues

[MrFatEggs]

Hi, I am in the process of building a 22r hybrid motor, but I'm having trouble with the valves. I did the clay test and the intake valve is just barely kissing the piston. What can I do about that other than stacking headgaskets?
This is the motor:
20r head from 1980 corona
Delta 272 cam- 433 lift
Rocker arm assembly from 22r
22r valves and springs
1983 22r block
Block bored 40 over
40 over pistons

[OVRAROK]

you need to clearance the pistons

[MrFatEggs [OP]]

How do I go about doing that?

[H8PVMNT]

Machine shop.  Shouldn't cost too much if you can find someone to do it.  I had a buddy that use an angle grinder but that's pretty sketchy .

You could just run a stock cam and not have to worry about it.  Gnarls on here ran some pulls on a bunch of cam profiles on some kind of desktop dyno and the stock cam profile isn't exactly bad unless you are going with a really nasty cam.  The stock cam makes more bottom end, has a really broad torque sweet spot and wraps out pretty well too. I am running it in a 20r/22r hybrid and after some tuning with an adjustable cam gear and getting the carb freed up and dialed in I am fairly impressed with the whole setup over a stock 22r.  It's not a 3RZ but it's getting there.  I can tell you if this engine was in a smaller, lighter pickup or a car it would absolutely rip!


Here this thread has a whole bunch of spreadsheets in it that Gnarly posted up.  I think some of the later ones even had the 20r data in the hypotheticals:  http://board.marlincrawler.com/index.php?topic=100575.0

[MrFatEggs [OP]]

I went ahead and used a grinding wheel on a dremel and took about the same amount of material off each side of the piston to keep it balanced, then repeated with the other 3. Thanks for the help!

[H8PVMNT]

I went ahead and used a grinding wheel on a dremel and took about the same amount of material off each side of the piston to keep it balanced, then repeated with the other 3. Thanks for the help!

I didn't really consider that one a good suggestion but I guess there's no reason it can't work.  The guy I knew who did it took a power washer to the pistons and deck after words to clean the dust off .  Anyway it worked for him so I would guess it will work for you.  Good luck man you got balls!