Not Ranked
DD,
I don't mean to harp....but I really would have the block gone through....it would be a complete shame to trash a motor with all new parts because of something easy to take care of....You'd hate to see that motor start smoking after 500-1000 miles because the rings are gone and the cylinders are oblonged and tapered....or trash a set of bearings because the mains aren't aligned.
With that being said, you're pretty limited to cylinder heads if you're planning the compression ratio around the pistons. I don't know how many different sets of heads have 64cc chambers...but you will need some pretty decent heads to make 400hp with 289ci. My Vic Jr's are 60cc's....
Now that we've established how much horsepower, at what rpm range are you looking to make it? I think 289's are generally revvy motors.....
When you figure out if you're going for low rpm stump pulling torque, or you'd rather have high rpm horsepower, then we can recommend a cam and intake manifold to match.
Comp makes some great hydraulic roller cams....the largest one they make off the shelf peaks at 6500.....and that's generally what you'll see as an rpm limit with hydraulic rollers. If you wanna go above that, you'll need to look into mechanical roller cams or solid flat tappet cams.
Give us an rpm range, and we'll zoom to the next step.
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