231 Evenfire or Oddfire?

When converting from the 4 to a V-6 it was common to find the other right exhaust manifold on the drivers side to clear the old steering box. Some people have told me ( there opinion , not mine) that the diehard Jeepers use points cause they can fix them on the trail. Maybe it was one of these guys who had to have the points.
over-all , you want the odd-fire for the low end performance and heavier flywheel.

 

I want to jump in this thread because I'm not sure about mine either. I don't see a casting number on the back of my block. I see a 3.8 on the right side where the top right bell bolt boss is cast. It has a big GM cast on the oposite side bolt boss. There is a casting boss that is threaded straight through the block directly above the fly wheel, just to the left side. Is that a knock sensor hole? I bought this thing from a guy in New York that told me it was a 231 with GOOD heads but didn't give me a year. It is a HEI motor and has a Edelbrock manifold with a 600cfm Edelbrock/Carter AFB. Runs very strong but I would like to know a year and odd or even fire.

 

There is a casting number on the block, it should be on the top near the boss you speak of. It may also be on the side of the block near the 3.8 cast number. Firefighter mikes was the same as you described, we found the casting number in one of the places I described, can't remember which though, his turned out to be 1983 evenfire motor.

 

Don't see it anywhere. The only thing I see is a big 16 right between the two top bell bolts. And a little tiny m123. ?????

 

Are the firing orders the same on these 2 engines.? Seemed like they were. You should be able to tell by the sound of the thing running, since nothing else sounds like the odd fire!!!!

You could check some valves opening and closing perhaps since the 1/2 3/4 and 5/6 pistons share a common throw, thus the "odd" fire?? I am not sure, just some ideas.

I would drop the pan and end the mystery myself.

 

I took some pics. What do you guys think? I can take somemore if there is something specific that may help identify it.

 

Thats an oddfire rotor but then again it would probably run fine on an evenfire.

 

You know i kinda wonder if the PO thought it was an oddfire 225 and just bought 225 parts when he last tuned because he swore it was the original motor and that it was an experimental Dautless. The points look to be in good shape so they probobly arn't that old. This Jeep is, or at least the tub is a '64 CJ6a Tux, but the drivetrain consists of the V6, T14, D27, D44. Weird. The only thing i can figure is someone down the road pieced this thing togather.

 

So ,asumming the casting # charts are correct, this is an evenfire 231 with an oddfire distributer that the PO mistakenly put on it?
What can I expect to pay for a 231 evenfire HEI setup at the salvage yard?

 

Good eye Sparky. That was a typo.
25506397
C 27 5R)

I wonder what the C 27 and the big 5 mean? Casting # maybe?

 

could have sworn the counterman at flaps said he had a listing for a 1974 buick apollo with a v6 and points ignition.