sen2two

my 1980 sa needs a new motor. i found one from a 83. im only switching over the core. is everything the same? like will the manifold bolt up and all that? like i said i'll be stripping it down to the core. so most things will not matter...

Mark7

AFAIK yes. Do you plan on keeping the emissions system?

sen2two

i spent the first 2 minutes figuring out what AFAIK means...lol



no emissions. no nothing. just RB manifold and holley 600. not much else...

BeaterRX7

The '83-85 motors have a different flywheel and front counterweight. If you want to keep your existing clutch you will need to use the earlier motor's flywheel and front counterweight. If you want to use the '83-85 flywheel you'll need the larger later clutch assembly (225mm vs. 215mm IIRC).



The '81-85 motors have the ignitors mounted on the distributor. If I were you I'd keep the remote-ignitor '80 distributor and not worry about converting to an '81-85 distributor.



Make sure your RB manifold covers the EGR port under the center ports. If it doesn't you'll need to fabricate a plate to cover it. Being that it's a RB manifold made for a 12A it should work on all the 12As.



The '83-85 12As use the beehive oil cooler instead of the air-oil cooler mounted under the radiator. Just remove the extra coolant piping and swap over your oil filter pedastal and you should be fine.



That's all I can think of...

sen2two

damn...thanks! thats some good stuff to know.



so being that my 1st gen has been most likely motor swapped. and has been rebuilt before it made it into my hands after almost 30 years on this earth. im finding that it has a lot of things that are 83-85 on it. how would i know if i already have a 83-85 12a in there??? because i have a 4-puck unsprung bronze cluth on it now. and would really like to use it without swapping the flywheel and counterweight. measure the flywheel???

j9fd3s

pics would be good

sen2two

camera is busted.....damn it

bigboi12A

79-80 rotor housings have a square on the top of the housingin in plain sight. 83-85 housings have an H looking type thing on the top of the housing also in plain sight. As far as the flywheel thing its verry easy to see the differance. 79-80 flywheels are thinner and most important do not have any dowel pins that kinda help hold the pressure plate in place. 83-85 flywheels are thicker and have dowel pins that stick out to holld the pressure plate. One more thing un sprung bronze clutches are violent and prone to chewimg up drive train components rear ends and trannys. Plus the bronze friction material tears the **** out of the flywheel surface. But they make they the driving experiance a **** load of fun. hope this helps!!!

sen2two

sooo....it does have the square petruding thing coming from the top of the housings. making it a 1980 core. but the flywheel does have dowel pins coming out out if. sooooo....i guess im lucky and wount have to find any parts. cool....



thanks for the help guys...

bigboi12A

yeah u got 79-80 rotor housings. and a later style rotatig assembly, or at leats fly wheel and counter weight. Word to the wise if your gonna use the flywheel from your present set up be sure to use the front counter weight too or u might get shake and bake!!!!