Quote:
Originally Posted by CC69Rat
I'm probably going to stay with the iron heads. To be perfectly honest I'm not what I'd call familiar with the heads either. From the research I have done though, they didn't come on this motor, and were originally a decent head of some sort. From what I understand they are closed-chamber oval-port head known to have issues with the valves being a little small. I am looking to be sure but I hear 2.19/1.88 really help on the bottom end. While I have it apart I might just flow these a little and go with larger valves (unless they already have them, which is possible) ..
.. just my thoughts right now. Could change.
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The early closed chamber oval ports shroud the valves really bad when you punch them out to 2.19/1.88's. They still fit & work but not as well as the later semi-open chamber and full open chamber versions do.
I would look for some different mid 70's vintage oval ports to rebuild and have punched out for the larger valves. It really makes a big difference on the oval port engines when they have a decent sized cam and good intake & exhaust system.
The 049 casting is popular but is the large 124cc chamber so you have to run a domed piston to get the compression even up to 9.5 to 1. This isn't a problem though as the 396 did come with domed pistons stock so there are several budget friendly forged piston options out there.
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