1200 heads on 1300 cylinders

[icebrrg3rd]

Ok, the question is, will the heads from an '83 1200cc motor fit on top of an '88 1300cc motor? IIRC, Dingy put 1200cc V-Max heads on a 1300 motor.

 

This is the issue I am having. I have a incomplete donor motor from an '88 Venture that I picked up for my '83 Venture that was having 2nd gear issues. When I cracked open my '83 case, I found out that the two center crankshaft bearings were damaged, with the journal of one having scrapes deep enough to catch a fingernail. The other exposed bearings looked dull. Also, the PO had opened the motor before, sealing it back up with red gasket sealer, getting it everywhere, even in oil passages. So I am a little concerned about the block.

 

The '88 motor had almost all of it's covers removed, and the intake/exhaust ports left open. Some of the valves are stuck open. I pulled the heads and the cylinders look fine, still has the cross-hatch marks on the walls with no up/down scratches. The exposed bearings look nice & shiny, and I see no damage on the crankshaft. My '83 heads are still fine as the bike was still running before I tore it down.

 

So what I want to do is put the good gears back into the '88, button it back up, and swap the heads from my '83 onto the '88, then install the '88 back into my bike.

 

I'm looking at head gaskets for an '88 and the valve cove gaskets from a 2nd gen.

 

I know I'm asking a question that I kinda have an answer for (and most likely the direction I will take), but I'm just seeing if there is any issues or problems that I should be aware of or look out for. I was hoping for a simple transmission swap but it's turning into a big headache.

 

-Andrew

[GaryZ]

I have not actually done the swap, however, I think it should work fine.

 

 

Ok, the question is, will the heads from an '83 1200cc motor fit on top of an '88 1300cc motor? IIRC, Dingy put 1200cc V-Max heads on a 1300 motor.

 

This is the issue I am having. I have a incomplete donor motor from an '88 Venture that I picked up for my '83 Venture that was having 2nd gear issues. When I cracked open my '83 case, I found out that the two center crankshaft bearings were damaged, with the journal of one having scrapes deep enough to catch a fingernail. The other exposed bearings looked dull. Also, the PO had opened the motor before, sealing it back up with red gasket sealer, getting it everywhere, even in oil passages. So I am a little concerned about the block.

 

The '88 motor had almost all of it's covers removed, and the intake/exhaust ports left open. Some of the valves are stuck open. I pulled the heads and the cylinders look fine, still has the cross-hatch marks on the walls with no up/down scratches. The exposed bearings look nice & shiny, and I see no damage on the crankshaft. My '83 heads are still fine as the bike was still running before I tore it down.

 

So what I want to do is put the good gears back into the '88, button it back up, and swap the heads from my '83 onto the '88, then install the '88 back into my bike.

 

I'm looking at head gaskets for an '88 and the valve cove gaskets from a 2nd gen.

 

I know I'm asking a question that I kinda have an answer for (and most likely the direction I will take), but I'm just seeing if there is any issues or problems that I should be aware of or look out for. I was hoping for a simple transmission swap but it's turning into a big headache.

 

-Andrew