Sounds strange, but I bought a 460 D9 block, crank, eagle H beam rods, probe pistons, 0.030 over #12397 D3 heads with 2.19 intakes, and a whole bunch of other parts. I measured the stroke @ 4.5" which is a 557 I believe, but the crank #s are LY0405QT4604500680012475. I cant find this # anywhere. does anyone know what tis # is. I was told that it is a 514 scat crank. I don't think that is right, anyone know what I have? What compression will this combo be with d3 heads (approx. of course) also what gaskets do you guys recommend for head gaskets.

 

You aren't going to want to use D3 heads with a 4.5 stroker.

 

I am starting to see that. I don't even think I would have baught it If I had known exactly what it was, but it is too late now. The guys over in ford 460 forum have enlightened me some already but I have a long ways to go. What heads will be a decent combo for what I have? I have 2 sets of good D3 heads and a performer rpm intake, L&L headers, and would rather not start all over at the beginning again, but I'm into it this far already I guess.

 

The guys at 460fordforum said that it is and rpm internal balance 4.5000 stroke, what are these good to, is it good for what I intend to do?

 

By looking at the number you posted, its a 4.500 stroke for a 6.800 Chevy big block 2.200 pin. Not sure if it's a cast or 4340, but at .030 over it's a 545.

If you port the D3's it will make a good hp and torque engine. If the pistons are flat tops your compression will be around 11.60 to 1.

With a 22 cc dish it will be around 10.1.

There is nothing wrong with this set up, even if it is a cast crank it will be good for over 600 hp. with no worries.

Hope this helped.

 

Sure did, helped me a bunch. The consensus I am findind is that this will work but there will be a lot of available horsepower hiding in the heads, correct? With this in mind, and a good porting job done on the d3s what RPM can I expect to shoot for so I know to keep my eyes open for a carb and stuff to set this up?

 

With a healthy street cam and ported D3 's you can expect it to be done by 5500 rpm.

 

I just talked to the mad porter and he said that a 500 hp plant that spins @ 5200 is reasonable. I might have him port my heads and see where it gets me.

 

Scotty will do you a good job............ He is very good with iron headed deals.

 

Thanks. I am trying to get him to respond to my emails. He seems like he is really busy but as long as he can get the job done I don't care that much.

 

He's a one man show............. I'm sure he will get back in touch with you.

 

I missed where you asked about rpm range, if its a cast crank, it's not rpm so much as hp. At about 750-800 hp a cast crank will start to flex in the crank pins.

A ford big block will stop making power at about 6700 rpm with the single plane intakes and lower than that with the dual planes available.

You can add more cam and more head, and the torque rpm peak will get closer to the hp peak rpm, and it will make more power , but it will still be below 6700.

If this is a street deal, you wont hurt that rotating assembly. Just pay attention to details and keep the build clean. Under 5500 rpm go with stock type bearing clearances, but over 6000 open them up to about .0034-.0036 on the mains and .0024-.0026 on the rods. Shoot for around 75 lb's oil pressure hot. Standard volume pump is fine. Don't step up to a high volume unless you get a deep pan.

 

Soiunds like good advice. I was shooting for a ~ 6000 rpm ceiling, scotty said that we would probably be done by 5200, I hoped for a little more than that, my 460 now goes to 6000 and I like it. Thanks for the input on the intakes that helps me for cam selection and carb sizing. What cam ball park do you think I should look into? What kind of rockers?

 

The low rpm he is quoting is because of the big inch engine not having enough head on it. If your wanting every bit of power you can get by 5200, something in the mid to high 240's with .560 lift on a 110 sep and 8 to 10 degrees of split.

 

240 @ 0.050 or advertised? my 460 has a comp 270 xtreme 4x4 in it now, and it is sluggish off the bottom, but somebody also ut 1.7 BBC rockers in it, and my research supports that this kills more bottom end losing the valve lift.