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Old 04-11-2011, 04:18 PM   #1
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20R head on 22r block?

So I'm wondering what the compatibility is of putting a late 70's early 80's 20R head on my 87 22r motor. If anyone has info please help. I here it boosts compression and will save me money if its compatible as far as deck clearance and everything else. Thanks.
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Old 04-12-2011, 01:27 AM   #2
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I have an LC Engineering Stage 5 Pro Stroker Off-Road racing motor and the head is a 20R on a 22R block. 20R heads breath better then 22R heads and they are easier to modify and port. Call John in tech at LC Engineering, I am sure he can help you.
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Old 04-12-2011, 05:01 AM   #3
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Thanks for the advice.
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Old 04-12-2011, 05:34 AM   #4
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Quote:
Originally Posted by suncomb1 View Post
I have an LC Engineering Stage 5 Pro Stroker Off-Road racing motor and the head is a 20R on a 22R block. 20R heads breath better then 22R heads and they are easier to modify and port. Call John in tech at LC Engineering, I am sure he can help you.
wrong. 20r heads breath better if they are ported out. And an 87 22r is not the right engine to use a 20r head on anyway.

here you go bud, accurate info:
http://www.toysport.com/technical%20...tech_notes.htm
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Old 04-12-2011, 08:26 AM   #5
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So should I just go with a new 22r head from 85-88? That will have enough deck clearance? Right now I'm running a 22re that has massive electrical issues. Can barely start it and when it does start it dies within 2 seconds. My plan was to eliminate all the unnecessary electrical that comes with the efi system, in turn making it easier for me to troubleshoot and trail fix.
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Old 04-12-2011, 08:46 AM   #6
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confused, are you wanting to convert your 22re to a 22r? if so, then the 22r/22re heads are all the same (85-95), maybe a slight difference in the factory OEM cams between the two, but they still work together. Just the 22r has a mechanical fuel pump instead of the electric in the tank and has a slightly different setup on the front of the cam that you will have to deal with, or remove the OEM EFI fuel pump and replace with a correctly rated carb fuel pump for which ever carb you go with depending on weber or Aisin. Both of which require different fuel pressures.

IMO if you can't figure out your issues now, how do you plan on converting in the first place? as it's not as simple as removing the EFI setup and slapping a carb on there.
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Old 04-12-2011, 09:03 AM   #7
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I know what I'm doing for the most part mechanicaly and have a friend with a auto shop helping me. Using the fsm I have gone threw all stages of troubleshooting for the efi system with no change. I have tried other troubleshooting with the ecs as well and still have gotten no where. This is why i want to go from re to r. I'm pretty well done trying to troubleshoot this thing and don't want to pay a mechanic to diag it. And with the pump and cam differences u were mentioning was why I was thinking of just going to a new head so that it will have the correct things in it already besides changing the fuel pump. Witch i had already planned for.
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Old 04-12-2011, 09:05 AM   #8
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Pretty much what happened was I was in the woods and was going up a hill and doing some bouncing. I was going to shift second to get more tire spin to get me up the hill as I was almost there and as soon as i grabbed second, I lost all power. Don't know what's up. I have fuel at rail and good pressure. I'm just lost on trying to figure this out.
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Old 04-12-2011, 09:06 AM   #9
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has nothing to do with the head what I mentioned about the fuel pump. In other words, you can convert a 22re to a 22r without even pulling the head.

wait a second? you said "and have a friend with a auto shop helping me." Why can he not diagnose it? Just sayin.
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Old 04-12-2011, 09:10 AM   #10
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I know the head has nothing to do with the fuel pump bits the difference between carb and efi that makes the difference between fuel pumps. I get that.
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Old 04-12-2011, 09:17 AM   #11
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"And with the pump and cam differences u were mentioning was why I was thinking of just going to a new head so that it will have the correct things in it already besides changing the fuel pump."

I don't think you do. In other words, "going to a new head" will not solve the need for "the correct things in it already" for the new fuel pump. ie fuel pump eccentric the 22r has versus the spacer that an EFI has between the cam and the timing chain sprocket. If you go with an electric pump for the carb, you can keep that spacer the EFI has, and not need the eccentric for the mechanical pump. Also the EFI has a removable block-off plate where the mechanical fuel pump would go on a 22r engine.
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Old 04-12-2011, 02:51 PM   #12
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I get what your saying. Thanks for the info. I have another buddy that's an auto electrical guy. See if he can diag my rig. If not then is off to carborated
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Old 04-12-2011, 02:51 PM
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