230 crankshaft into a T-207 engine

[akaw6zut]

Planning to put a 230 crankshaft into my 215 cu. in., WC-3 engine. Will this be a direct replacement or do I have to modify the block?
Anyone have experience with this modification? Will I need to grind reliefs for the longer stroke? I have the 8-bolt flywheel and the rods from the 230.
Paul

[Ben Dover]

WC-3 originally had the T-207 217.7 CID. Engine with 3 1/4 Bore X 4 3/8 Stroke

WC 21, 22 had the T-215 230.2 CID. Engine with 3 1/4 Bore X 4 5/8 Stroke

You may have a problem as the 217.7 CID uses a different Block than the 230.2 CID.

There is no 215 CID Dodge Block, you may be confusing it with the T-215 Engine. What is stamped on the block next to the Oil Fill Pipe?

[akaw6zut]

Yes got my numbers mixed up. Have a crankshaft from a T-214 block I want to put into my T-207 engine to stroke it to 230 inches for more torque, and still look stock.

[Ben Dover]

You should compare the heights of the two blocks to be sure.

[Marty, SoCal]

A T207 block has different valve sizes, both being nearly equal in size, a 230 has larger intake valves and smaller exhaust valves, IIRC.
I'm pretty sure the deck height is the same.
Although it's been 20+ years since I worked on my T207 engine, the valves definitely were different.

[Ben Dover]

One must proceed with caution on the valves, some of the 217.7 CID use same valves. Some share the valves of the 230.2 CID. You best compare them at disassembly. Also the 217.7 CID and 230.2 CID do not share the same Connecting Rods. Beware of there being a difference in height between the two engine sizes.

[Marty, SoCal]

Ben's correct, you need to keep the 230 rods with the 230 crank, and the 218 rods with the 218 crank. Pistons are the same. Make sure you use a forged steel truck crank, the passenger car cranks are cast iron.

I was able to match the larger exhaust valves for the early T207 218" six with ones for a 236" or 251" "Big" six, the smaller intakes I had to cut down from 230 valves by having the heads' diameter ground smaller then the angle recut. With todays internet, maybe someone has some NOS ones so the added work wouldn't be needed.

I think the mid series T211 218 might be the one that has the same valve sizes as the common 230.

[Ben Dover]

When I dive into these topics dealing with swapping parts from one engine model to another, I lay out several 1940's era parts manuals along with the proper TM10 and SNL for the two engines. The real Bible for these variations within Chrysler Engine Types is my 40's thru 60's McQuay Norris Engine Parts catalog, it allows quick reference to these little differences. I can forsee problems with this parts swap. Best to stick to OEM.

[goldhill joe]

Rods are different length,Itried it years ago.

[akaw6zut]

Thanks for the replies, I should have mentioned that I have a cracked 230 block that I stripped of everything, valves, rods, crankshaft and flywheel, which I'm using for parts. My biggest concern is the reliefs on the block for the rods. My old engine is still running good and it will be awhile before I rebuild it, I'm just getting the parts and information together now. I don't know if the 216 engine has the reliefs for the rods in it.
Paul