413 marine industrial (E) engine, to, not so industrail......
Yes - 383, 400, 413, and 440 heads are interchangeable, as long as nothing odd was done to the block to make it industrial/marine.
The 516 casting number mentioned earlier is a closed chamber / small valve 383 head, they were common on mid '60's 383s, may have been used on other engines from the factory, and came with 2.08/1.61 valves. I read somewhere that the chambers were supposed to have been 73.5cc, someone on here told me they were probably closer to 78. If you find a pair you want to use, if you plan to run unleaded without additive, make sure they have hardened seats installed. It probably wouldn't cost too much to have a machine shop install the seats and 1.74 exhaust valves for a little better flow, while they're in the shop the guy can check to be sure the spring seat pressures are within spec for whatever cam you pick out. This is what I had done to the pair I bolted on my 440.
If you can get me the casting number from the heads you have I may be able to find the same information for them.
- Steve