I think I have a 21R...
#1
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I think I have a 21R...
So I was installing my header today on my 79 truck. Everything was going well when i noticed the engine 'tag' stamped on the block. It says 21R. I have heard very little about these engines except people say to get rid of them.
The header installed no problem, everything lined up. So what other parts from a 20R are compatible with this 21R? I have a new weber 32/36 and adapter for a 20R sitting in my shop waiting to install. Why does everyone say these motors are junk?
I am at least the third owner of this truck and have had it for about 9 months, i have thousands of dollars of parts waiting to install, springs, gears, lockers, steering, tcase 4.7, all kinds of stuff. Now I'm a bit concerned about the 21R.
Last week i discovered my newly acquired W56 was full of rusty water, now this... :pat:
oh well, i guess I'll run it till it dies then look for a 20 or 22R.
sorry about the long post, just kinda frustrated right now...
Brian
The header installed no problem, everything lined up. So what other parts from a 20R are compatible with this 21R? I have a new weber 32/36 and adapter for a 20R sitting in my shop waiting to install. Why does everyone say these motors are junk?
I am at least the third owner of this truck and have had it for about 9 months, i have thousands of dollars of parts waiting to install, springs, gears, lockers, steering, tcase 4.7, all kinds of stuff. Now I'm a bit concerned about the 21R.
Last week i discovered my newly acquired W56 was full of rusty water, now this... :pat:
oh well, i guess I'll run it till it dies then look for a 20 or 22R.
sorry about the long post, just kinda frustrated right now...
Brian
#3
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so does anyone know if a cam and rockers for a 20R would fit the 21R? I was going to get a cam when i thought I had a 20R, if it would work on both I'd still get a cam and swap it to a 20R when the 21R dies.
Thanks!
brian
Thanks!
brian
#4
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top end is still the same as a 20R/22R. cam and rockers will fit just fine.
the only real difference between a 20R and 21R is that the 21R has a smaller bore. all the other parts are pretty much interchangeable. not a bad engine, just gutless.
the only real difference between a 20R and 21R is that the 21R has a smaller bore. all the other parts are pretty much interchangeable. not a bad engine, just gutless.
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21 r
Well you got better luck than I, I had all the motor rebuild then after all I spend I learned about it and believe me it was frustrated to know about the motor:
http://www.cardomain.com/id/semork99
I was very frustrated when I learned about it here that this motor was from a fork lift and all those things you have heard but well until I tried out I is pretty strong I have gone to 80m/h In the freeway 70 easily 80 behind a big truck so if you plan to rebuild it I'm shure you wont get disapointed.
http://www.cardomain.com/id/semork99
I was very frustrated when I learned about it here that this motor was from a fork lift and all those things you have heard but well until I tried out I is pretty strong I have gone to 80m/h In the freeway 70 easily 80 behind a big truck so if you plan to rebuild it I'm shure you wont get disapointed.
Last edited by semo; 01-07-2009 at 12:42 AM.