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All I want is a nice street machine that can get into the low 13's and make it a weekend driver. While I'm in college, I'll come home on the weekends to work on it and my ole man will be working on it during the week. He has the templates to port and polish the heads. I want right around 10:1 compression in the motor and I'll probably just have the factory 3.23 sure grip posi rebuilt just for safety sake. Do the 346 really come with hardened seats from the factory??? I thought they needed hardened seats put in.



Dude...BOTTOM LINE John is right you will NOT get 10:1 with your current combo. Doesn't matter how much porting you do. Those open chamber toilet bowls and the pistons being a mile down in the bores are what's killing you.

You need more gear and a good amount of machine work to get that CR and 13's. No problem really, just don't expect a weekend rering and hone job to do it.

'73 GK6 Challenger Rallye - 340 4-Speed