I have been doing some research on this engine build. While it's possible to bore a 261 .125 over sized I don't think that would be practical. I am thinking of .040 -.060 over with a flat top piston, decking the block to around .020 -.040, hoping for an even 9.1 compression. Doing some head work, larger intake and exhaust valves, unshrouding the valves and some blending. Possibly a lump port on the intake runners, and opening up the exhoust a little. These things are basically a Tractor engine, made to do work and keep going. Having a 261 with around 270 CID and good low/mid range torque is really the goal.

Camshaft selection is key in this build. The factory cam was pretty much the same as the Corvette 235, Jerry as mentioned the Melling CCS-1 cam. The idea on a higher lift cam sound good until you factor in valve clearance, things can get a little tight. While I'm not looking for a full out race engine, some extra ponies would not be bad. As this engine will ultimately find it's way into "Thor" it needs to be able to work. I keep telling myself torque is the goal here, not speed.

I'm open to your ideas and suggestions.

Last edited by Phak1; 05/09/2024 11:22 AM. Reason: Spelling
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