360 head on 318

OldVart said
7174duster, you'll probably be happier keeping the 318 heads on there. As Bobby mentioned, with the 360 heads you'll loose some compression ratio and you'll also loose velocity in the heads due to the larger ports and valves. Basically what this means in every day driving is that it will loose a lot of snap on the bottom end, and that's where you need it for the street. If you're planning to build a 360 anyway, keep your present 318 combo until the 360 is ready. Then you'll see some real horsepower and torque increases over the 318. Good luck.

Well, if i may chime in here. I have J-Heads on my 318, and 9.7:1 Compression ratio. The heads and the intake face of the heads have been milled. Untuned and ive since changed a couple things it dynoed at 240rwhp/270ft/lb. I'm quite sure that its more than that now, the motor cost me a total of about $1500 to completely build including getting the heads rebuilt, new valves, 3angle valve job....so i'm not doing too bad in the bang for buck category.

It is a daily driver, and there is no lack of 'snap' on the bottom end in my opinion, however the 3000stall converter and 3.91s will help that out...

If you are trying to use 360 heads on a 318, then the same heads on a 360 it will really not work. Becuase you'll need to mill the heads pretty good to get the compression up, as where you wouldn't on a 360..,which would have the 360 with some darn high cr. Just my .02cents

-Mike