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I told you a lie earlier. The 75-80 20r blocks and 81-84 22r block height were both 9.120". The 85+ 22r block height were like 8.something i cant remember the exact number so basically if you wanna do a hybrid. you basically have no choice but a pre 85 block. It seems like iv seen someone do one with a 85+ block though? maybe they just milled the head down alot?
You definantly are helping! I've already learned alot. Do you know of any websites that might have the parts I would need to build the 20R head that way?
FYI with the year of truck you have and the upgrade from the 20R to the 22R check the general plugs for the wiring you are on the edge of having different plug ends. All of the plug ends were different on my 80's 20R over the 22R that was found. Had to change/cut wires and such. So check your donor and if they are different then you will need both ends of the plugs.
Well im never one to argue cause i know im not always right but i got the block height numbers from LCE themselves and anyone who has worked on an R series motor will agree LCE knows there toyota motors. Maybe they measured from a different spot on the block than wherever you got your numbers from. Who knows. But I just wanted to point out im not just throwing out numbers from off google. Iv done my research and iv worked hands on with these motors for years too. Even though iv never took the time to measure a block lol. Im not by any means saying that what you say is wrong. I have alot of respect for your knowledge, in fact the reason i joined Marlin crawler is so i could ask YOU questions about my weber 38 because iv read alot of your posts and you know what your talking about @79coyotefrg. Now i will admit i do get into a little bit of a fantasy world when it comes to building motors and tend to go over board lol. this guy really could just throw a basic intake and head off a 20r onto the right 22r block and go but where's the fun in that haha.
I'm not super savvy, but I would like to do this right. My 1976 Toyota Chinook's 20r gave out, and I'm having trouble finding a replacement. 22r's (pre '85) seem to be a lot more affordable, but I'm having a hard time wrapping my mind around exactly what modifications would need to happen for the swap. I'm not confident enough in the cylinder head to play with the hybrid. My first dumb question is: can I use the 20r carb with the 22r engine or is an adapter enough? And I know I need an intake adapter, right? If someone could clear this up for me I'd be infinitely grateful. -emily
Thank you all for the large amount of information! I am sorry it has taken me so long to update this thread, but after two deployments and not much time on my hands, I traded the 81 Toyota and sold the other motor I had. Now I have a 1980 with a 4in suspension lift, W56 trans and no motor. I was however able to get ahold of a 2RZ from a 95 Tacoma that needs a set of rings and upon my return from my current deployment, will be rebuilding the motor and putting it into my truck!
When you take the RZ head off, do not turn the head upside down don't remove the lifters they are not adjustable leave it be or else! You'll need a w59 bellhousing now
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