Im looking for a 240 head. I have checked all of the local junkyards around me and nowone has one or carries invetory that old. Im looking to see if someone could point me in the right direction or tell me what years and models they came in. Thanks

 

From what I understood the EFI 300 six heads (fastburning) have pretty good power adding potential. Just another thought if you can't find one from a 240. None that I know of around here, sorry I couldn't help. Good Luck!

 

My 66 Custom 500 4 door sedan has a 240. I had lots of problems with it, I'm thinking it's because of how it was stored for 6+ years in a MO garage...they rolled up the windows, but that is all. Lifters plugged, overheated (probably my fault) burned oil. Now I've been storing it in a field for 10+ years. Sad.

Look to the 60's for the 240, or just put on a 300 head.

 

That doesnt sound like problems in the head of the 240 though. I have a perfectly working 300 head on there now(well kinda) Im putting the 240 on to increase my compression a couple of quick, cheap, easy points. Found a few arounf 110 shipped but not rebuil and another one 150 rebuilt and shipped, pretty obvious so we'll see.

 

Just have your 300 head milled. That will produce the same results.

 

Oh yeah,... I didnt not know that. How much should be milled off? And how much does it cost? Ive never had anything milled or decked before so I realy haven't a clue. By doing this, this will creat a smaller combustion chamber though? Could you elaborate on that please. thanks

 

I'm not sure how much would need to be milled off. It would be best to talk with a machinist about that. If you mill too much, you'll end up with too high of a CR, or the head deck will warp from being too thin.

Doing this will create a smaller combustion chamber, which is the same as bolting on a 240 head. I don't know what the cost would be, as it varies from region to region. I would think it would cost less than buying a 240 head, and then having work done to it to make it run. You said the 300 head is good, what have you done to it?

Also, you need to be sure that by milling the head, it won't cause piston to valve interference. That is why you need to have a machine shop look at it. Once they have info on your block deck height, how far down the pistons are, ect., they could tell you what you need to have milled. I think the difference between a 300 head and a 240 head is ~6 cc's. That's cubic centimeters. So I wouldn't think that much needs to be milled.