I have an opportunity to buy a Bryant crank for a very good deal. A guy had several 4.00 stroke cranks built for a boat, then backed out of the purchase. A good friend of mine works for Bryant and talked him into selling me one for a deal. The concearn I have is that it is a cross drilled crank (for boat use) I have heard this is not the ideal set up for higher rpm use. My buddy is also going to help me build the motor (way more experiance than me) and he says if we run tight bottom end bearing tolerances .0015 or so and restrict the top end of the motor (oil) we will be fine. This is beyond my expertise, any opinions on this.

I have a 6 quart Moroso pan.

that crossdrill thing is way overrated IMO. Not needed, doesn't help much, doesn't hurt anything. You could tighten up the rod clearance some, but it won't help anything, so why bother. Hard to tighten up clearance on a crank that's already ground anyway. Just run it, he's always made good cranks, you're not going to hurt it.

You'll want to be real careful restricting the oil to the top end if it's a street car.

Tom

You might run it oiling problems if you are
going to run 6500 plus RPMs with the crossdrilled
crank.

You will not have any problems over 6500rpm I have no clue where that came from. I know R&M says not to cross drill but I have never hurt a cross drilled crank that something beside the crank was at fault. I have run non cross drilled cranks but I always ran a full groved main bearing even though I don't like them. I was always worried about the rods not the mains. Chev. made all of their HP. big block cranks crossed drilled even though it does weaken the crank I still like it.

Thanks guys.

Tom, I have a factory 427 forged crank, cross drilled obviously, and a restrictor in the block. It is an intermediate restrictor, not the smallest one {I think it is anodized red, and the one that came with the engine was smaller, blue, I think, which was switched up to the larger one at my pleading}. Why is restricting an engine with a crossdrilled crank undesirable?

I personally do not run restrictors in anything. The only exception might be a drag race only deal. I think you will find most engine builders do not run them anymore & the cam guys will tell you not to as the springs need all the cooling they can get.
Unless of course you are running dry sump with spring oilers :D

As a matter of fact, Wolfplace, I phoned Jeff Johnson's in the spring {very concerned about the restrictor the megalomaniac was insisting on}, and asked him what he would charge for his spray bar conversion on my used Jeff Johnsons. I can either take the restrictor out, or send the valve covers off to Jeff. Not to hijack a thread, but, waddaya think?

I'd just pull the restrictors. The oilers are more of a circle track or endurance thing & if you drive it much you may have an oil control issue at the guides as 16 "controled leaks" is a lot of oil. :D

A friend is going to a set of sprayers to try and help valve spring life. He is having real trouble with springs on a Super Comp car. I will let you know if it really helps or not.

I can see where they could help on a SC car, sometimes they run them guys like circle track cars :D

He is crazy the thing has a 565 Big Chief in it. It's an 185MPH 8.90 car with .820 lift cam. I don't think anything will help but you never know.