which block to use?

[abodyfan]

I'm building a 340 for my 68 Dart convertible. I have a block that will need bored 60 over because it is currently 40 over this block is a 1970. I have a set of x heads to put on it the only thing I need is a set of pistons. I also have a complete carb to pan 1973 340 might need freshened up, I will put the x heads on it. It ran when pulled I understand that the 73 engine is lower compression. My question is will a 60 over block run cool and be reliable? Or should I build the standard bored 73 engine. I going close to stock maybe a better cam but nothing to radical.



Thanks
Brian

 

[rumblefish360]

The .060 can run cool, no problem. But the '73 untouched block would be better to use IMO

 

[1970Duster]

73 block internally balance it and if you have a steel crank it's the way to go.

 

[swinger340]

Std bore is better IMO. Buddy of mine is running a .060 340 and it has a tendency to run warm on hot days. He is running a big be cool w electric fans. Tried retarding the timing a little. No matter what he tries it still runs warm. Only running 160 cyl pressure so it shouldn't be running to warm.