Jim Shepard Posted October 25, 2008 Report Posted October 25, 2008 I understand that the 218 head is different from later (i.e., 230's) versions in that there is an extra waterjacket. The 230 I'm going to overhaul and use in my B2B was missing the head when I got it. I need to replace it but I don't know the difference between it and the 218 head. I understand there is a "hump" on it. Can someone post a pic of it (and, preferably both) so I can compare it with the 218 head I now have? Thanks. Quote
greg g Posted October 25, 2008 Report Posted October 25, 2008 I don't believe the difference causes any problems. I have heard on here a couple of times that usig a 218 head on a 230 will result in a higher compression ration than the stock 230. In either case milling the head for better compression is one of the biggest bangs for the buck performance wise of any of the standard hot rodding procedures. Regardless of whether you are doing any other odifications to the engine, you might as well squeeze the fuel as tight as you can to get as many ponies as you can. Quote
Jim Shepard Posted October 25, 2008 Author Report Posted October 25, 2008 So, with the "bump" and bypass hole, there would be a corresponding hole in the block? Quote
pflaming Posted October 25, 2008 Report Posted October 25, 2008 What is gained by milling the head? I would guess horse power. Does it help gas mileage? What are the down sides? Quote
greg g Posted October 26, 2008 Report Posted October 26, 2008 Look at the specs shart on carut.com for Plumouth and dodge in the 40's. As you can see the same engine gained HP steadily throughout the decade. THe only difference you will notice is that the compression ratio goes up from 6.something to 7 to 1. Each increase in compression ratio engenders an increase in HP. More squeeze = more bang. One can take up to .070 off in combination with the head and block and increase the stock CR to about 8 to 1. You can take more but you get into needing premium fuel. You also need to increase initial timing as CR goes up. Quote
Jim Saraceno Posted October 26, 2008 Report Posted October 26, 2008 The only difference you will notice is that the compression ratio goes up from 6.something to 7 to 1. I think you will find that the latter models also had larger volume carburetors, intake and exhaust manifolds. Quote
1937 Dodge Posted October 27, 2008 Report Posted October 27, 2008 You will also find that the later model 230s had more aggressive stock cams. Quote
Frank Elder Posted November 1, 2008 Report Posted November 1, 2008 Do we have to have our cams reground or are there sufficent aftermarket sources? Quote
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