318 Block

Let me add that the 273 is still my favorite Chrysler small block. It's light and has a low deck height - it can fit into small spaces and is very capable of 300+HP.

Auto and marine blocks for that engine are the same.

Motor mounts are in a different position. Are you up to relocating your motor mounts? I wouldn't. If you have the danolia to spend stick with a 318 block (for ease of mounting back into the boat) get a set of post '72 340 or 360 heads (they're everywhere, cheap, and have larger runners and valves than the 318 heads), get a stock 340 cam, a 600cfm 4v and you will have a smokin' mill. Be sure to get an intake to match whatever heads you get. Your compression will drop a lot with the 340/360 heads but their flow capability will help out the cam and 4v carb and will let you run cheapo gasoline.

Then agian, if you don't mind moving your motor mounts there is no substitute for cubic inches.

I miss my Mopar.

You can use the block as a core on a Jasper engines and transmission short or long block and reuse all of the good parts. Most re-man outfits will not take a craked or junked block and charge you a pretty good core charge if it is not re-buildable, Jasper's only criteria is that it cannot have a visable hole on the outside of the block and you get full credit for the core and a 18 month warrenty. Also if you want something a little stronger than what you had ask for a Class II long block.

I have a 1972 S/N with a 318 and a cracked block. How do I find out what I can use for a replacement. The motor still turns and ran fine when it was put away. So I can use the heads and front cover assembly. Does anyone know how compatible the 318 block is withvarious years? Thanks.

Chris