Hi,

I looking for some input on a 572ci build.

mega block(were is the best place to buy a block?)

aftermarket heads indy or B-1`s?

Thanks


Mike

How much power are you wanting to make? Or how fast do you want to go? Weight of the car?

Thanks for the replies.

The car should weigh 2800-2900lbs.I would like to make over 800hp and still be able to drive 5 miles into town.
Is it possible?

B1 heads and I would look for a Koleno block.

Go B1s search racingjunk theres sometimes a good packaged top end deal what compression are you looking at ? compression ratio can be hard to keep low if your not careful with part selection, I got a short block World alum. from muscle motors.

PM members Old School or Firefighter3931, they both have very streetable 572's with recipies that are very similar to my "puny little" 517 (which runs ok for a "small block")

Bore 4.6
Stroke 4.3
B1 Heads 11:1 compression pistons, long rods.
1.7 rockers, cam 275@.050 .750 lift, 106 LCA
Single plane intake with 1200cfm carb
2.125" headers

This should make around 850ftlb of torque at 4700rpm and 860hp at 6000rpm.
It should make 550ftlb of torque at 2500rpm, excellent street manners and a good low rpm engine that should last for years.

A Indy Maxx aluminum block would be your very best choice for a block.It over a 100 lbs lighter than the other blocks and just as strong if not stronger and can be repaired!Being you don't already have heads go with the 572-13 heads.Complete as per Indy these type engines weigh less than 500 lbs.I have also noticed an all aluminum engine runs a lots cooler.

If I were to detune my 528, it would be around 800 hp, minimum with proper compression and a bit more moderate cam. Torque would be at least as good as B1 heads from 5000 rpm down, but would probably not be a good above that. In your case, it all depends on your plans for track use, as the car won't have sufficent traction to use even 750 hp on the street. That, and total cost. Don't rule out a set of SR heads ported to max wedge size. They should make 750 hp, be very responsive, and make that power well below the B1s and the most likely the 440-1 heads as well. They will also be a LOT cheaper to put together.

The big advantage of the B1 is the valves are on the bore centerline like a smallblock, helpful at the high lifts and high RPM's for racing but with a 572's 4.500" bore any of the standard Max wedge heads would benefit provided the chambers are relieved to take advantage of unshrouding at lower and mid lifts, both are good for torque and make the whole combo not as 'big duration dependent'

I would probably go with the tried and true -1 if you are looking for 800-820 with a big roller 278-282-ish @.050 duration but with a more endurance type lobe. MW Chapmans would make INSANE torque due to the killer (.400-600 lift flows) but up top (above around 5500 at 572 cubes) the B-1's will probably work better mainly because of the larger runner volume will keep the velocities from going hyper-sonic. For a manifold I'd probably look at something like the big indy "bathtub"....just to see how much torque you could really wring out of that thing A big indy single might out HP way up top but at only 2900 pounds I'd rather have the extra torque and gear it down to keep the revs and required spring pressures in a real sweet street survivable range,...opinions vary though.

At 2900 lbs. you don't need much torque.
It will never hook up.

Indy block is a good bang for the buck, I would definately go aluminum block and b1's!

Casey

As for hooking up all I can say (and I run a 540 ish hp 427 small block in a 2400 lb Cobra) is a lot of torque WILL definately hook up with the right combination of tire/gear and weight transfer, in many ways big broad torque makes it more tractable, lighter weight and big tire contact patch is much easier to launch than in a heavier car, you can gear it sensibly so as not to rely on the hit as you do the actual roll out.

We don't know much about the car he has in mind but look at Ron Silvas 501 cube small block A body, with light cars there is far less wasted motion and more can get to the ground when it's properly applied.

Guys thanks for all the input.
can you tell me who has the best price on a block or are they all about the same?