13:1 Compression Pistons in 340 Small Block

Thanks for the feed back!

I would definitely like to be able to drive this on the street but also have something I’m not scared to talk down the the strip and roast the tires with. This engine is going into a 340 Dart but the block is non numbers matching (if I was numbers matching I would rebuild it to stick specs) I’m not scared to spend some cash on cams and run Some high octane fuel and I don’t care for fuel economy but I’d like to get better then 8mpg. It’s an automatic car and I haven’t looked into torque converters or anything along those lines. I have a 727 trans I was going to use with this application if that helps at all.


With that much compression, you will need to run a camshaft with lots of duration and overlap (smaller lobe separation)... It will have a choppy/lumpy idle, and you will have to run high octane fuel... You will also have to run a high stall converter and tall rear end gears... But it sounds like that is what you want, so get-r-dun....