Oil drain bolt

Does any body know what size the oil drain bolt on my 68 260 ford is. I would like to replace it with one that has a drain hoes tapped in it. It would be nice to put the hose threw the drain in the bottom of the boat and catch the oil from under the boat. I bought one from Overtrons years ago but it was the wrong size. Thanks

I'm not positive but my source is the 68 sales brochure. It gave two options for the motor 165hp and 210hp. Mine has a old but orginal silver and black sticker that has 165hp on it. I alway thought the boat had a 302 in it but the low hp made me wonder. Then I found this sight and was looking at the 66 price list and the mustang came with two motor options 170cu in @100hp and the 260cu in. @165hp. So my guess is that my interceptor is the 260cu in. model being the 165hp match up.I would like to think it is bigger but it is what it is. What is your source for the 289 size. I would think it would have a little more hp than the 165 I have. Is that the 210hp offered in the 68 sale brochure.That also seems high for only 24 more cu in. to get 45 more hp.

The only thing I have to go on is that the previous owner told me it was a "200 HP" engine. I have been assuming it was a 289. There is a number cast onto the block under the starter that indicates which block you have but I cannot see mine without pulling my starter.

I am in the process of replacing the heads with a GT-40P set I just purchased. When I remove the old heads I will be able to measure the bore and I will know for sure.

My engine has no Horsepower decal on it.

As far as 45 more HP, I have to agree with you. Those ratings should be taken with a grain of salt. Horsepower ratings are somewhat subjective. Manufacturers can be liberal, in either direction, when rating the horsepower output of equipment. Sometimes horsepower ratings are assigned for marketing purposes. It could be your 260 was rated on the low side while the 289s are rated on the high side. Who would pay a lot more for just a couple of additional HP? I remember back in the 60s - I had a friend with a 260 in a small Ford. It ran very strong! The 260 is no slouch. So, the answer is: who knows?

1968 Interceptor was a 289ci. It was offered in 4 horsepower versions: 165/190/200/210. I think the thread size is 1/2" X 20. I have the 165HP version in my 1969 Mustang.