My 514 race engine made 900 hp with ported EZ heads and a single 4bbl. That engine spent a lot of time on the dyno to get there, but once we figured it out the recipe wasn't hard to follow. You should be able to do it with -1 heads if they have good ports. You'll need a ported intake, a big Dominator, lots of compression and a big cam. I think you'll need Jesel rocker arms to hit 900 hp and if it was me I'd use a Jesel belt drive and a belt drive distributor since those things just make it easier to work on the engine.

If it was me I'd go with 4.500 bore size and a 4.250 crank. That gives you 540 inches and it should go together really easy. Lots of vendors for the parts and good rings are available at that bore size. Shoot for 15:1 compression if you want to make 900 hp and run X16 gas.

Send the heads to Porter Racing so they can go thru them and advise you on the port work. They can also set you up with the right cam and valve train for 900 hp. Only intake that will work on a low deck is the Indy 400-3. It isn't a great intake out of the box so ship it to Wilson or to Fast Lane. Figure on $1000 for the port work but you'll need it to hit 900 hp.

Good luck and make sure you have about $20K in your check book before you start.

Hugo, lots of guys like the 540, and they have good reason. It is about as big as you can go with a low deck and have a reasonable piston pin height, piston skirt still up in the bore to keep the piston stable. A local racer ran a 540 b1mc about 20 years ago, and made over 1000 reliable hp. And i think the reliability is what you will find out is the difference. Trust me, go for reliability. I didn't and spend way more time working on my motor than racing.
If it were my motor, i would go 540, B1Mc ported heads, and a cam custom ground with the intent of giving away the last possible 20 to 30 hp in favor of a cam that is VERYeasy on parts. You will probably be running this deal to almost 8,000 rpm, so plan for it to make it live.

I'd be surprised if you needed to turn it 7500 rpm. Peak power with -1 heads on a 540 with a 400-3 intake is probably in the 7000 range. Get the engine on the dyno and you'll know where the peak is. Knowing where the peak is will help you when it comes time for gears and converter.

If you are trying to hit 900 hp then I think you would need to start with a 400-3 rather than the 400-2 intake. Get a ported 400-3 and then dyno test them both. Keep the best one and sell the other one.

Thanks Greg but for now I’ll stay with my 440-1 in the future I’ll see if I can upgrade. Ido want reliability and maybe keep my rpms to around 7500or 7600.

No love for the 440-3x?