Just picked up a 4.5 bore Gen 2 hemi block. I want to build a 572 street motor for a cuda. What would be the most cost effective setup and where would I access same? I don't need the best of the best as the car will never see strip use. Planning on using mopar performance aluminum heads/rocker assembly and would like a compression of 10.5 or so. Suggestions for completing my long block would be appreciated. Thanks.

Not sure if you'll be able to find a stroker kit or not but it isn't too hard to build your own. A 572 requires a 4.500 stroke crankshaft which you can get from SCAT, Callies, Molnar, etc. If it was me I'd use the Chevy 2.200 rod journals and then use a 7.100 long connecting rod. Then you just need pistons but those shouldn't be too hard to find. Diamond, JE, Ross, Wiseco, etc. can take care of you.

Use a shorter rod, then the pin won't be in oil ring.

I'm almost sure the oil rings won't be in the wrist pin I would call the piston maker you want to buy from and ask them about the wrist pin location with your stroke and the 7.100 long rods The lomger the rods the lighter the pistons can be

Thanks guys for the replies. I obviously need to learn more before bringing out the checkbook. Appreciate your knowledge.

I have Eagle 4.5 crank with 2.2 rod journals , eagle 7.1 rods and Diamond 10.5 pistons in my 572 . Hemi's normally use a 8 bolt crank. Most distributors have all the items you need.

If you want to use an internal oil pickup you will need to use the 2.200 size rod journals.

As far as the Mopar Performance aluminum heads and valve gear, my M/Perf Edelbrock casting aluminum Hemi heads the springs went from 140 lbs of seat pressure down to 110 lbs of seat pressure in about 900 miles. Junk!

Thanks for the replies. So for my own understanding, what is involved in an external oil pickup? Also what reasonably priced head/rocker combination would you recommend if not for the mopar head assemblies? Appreciate it.

If you're starting from scratch on buying parts I'd say use the 2.200 size rod journals and eliminate the need for the external oil pick-up completely.

If I would have known, I would have.

It really depends on which block you start with on the external oiling system.

If it's a Mopar Performance/World block that has the AN boss on the front of the number 1 cylinder it's not too bad.
You basically need a pan mount swinging or fixed pick-up and a line to run it to the AN boss. You can use any normal style oil pump.

Mine uses a regular Street Hemi oil pan with the swinging pick-up.
How mine looked before paint.


Without the AN boss you need a pump that uses an external oil feed line, which can run into engine mount clearance problems if you run factory style mounts.

As far as the heads, if you replace the installed Mopar valve springs the Mopar Perf heads would probably be fine.
Stage V heads might be a better option.

You don't need knowledge. That's what Ray Barton is for. All you need is a phone.

Mine are 3/16 into the oil ring, have to have a ring support. This is with a 7.045 rod.

I did and would again call or e-mail Tim At FHO [for Hemi's only] for information about your build and what he can do for you.

Which size wrist pin did you use, .990,1.040 or 1.07? Do you know how much your block deck has been cut? It has been a long while since I last assembled a 4.500 stroke 426 type Hemi motor so I may be not remebering correctly on the wrist pin location

Down .130 , 1.03 pin, 2.2 journal. A little wiggle room between crank and piston.

I have had a few 572's (4.50" x 4.50"). All with Diamond pistons. Two with 7.1" rods and .990 pins (2.20" rods). Neither had the pin in the oil ring. I had one for heavy nitrous once that had thicker domes and the rings moved down. It had the pin in the oil ring.

Hemi or RB? Hemi valve relief dictates lower ring pack.

Hemi. I will try to post a pic tonight of the last set.

Hmmmm.. Maybe I would just be better off going with a 4.25 stroke I think that would give me a 528 with the 4.5 bore correct? Might be a whole bunch simpler for this newbie. Thanks for the replies.

Maybe 540 with 4.25 528 with 4.15

Ok. Didn't do the math. Thanks.

I'd highly recommend the 4.25 stroke. That combination basically falls together and then you plenty of clearance for the windage tray and the internal oil pickup. Just buy a high quality 4.25 stroke crank with 2.200 rod journals and get a set of good 7.100 long BB Chevy rods and you're good to go. Most anyone should be able to make pistons for that combo, might even be a shelf piston at JE or Diamond.

So if I put together a 540 with mopar heads,10.5 compression and a cross ram/ with a hydraulic cam what approximate horsepower can I expect? Would like to have car run high 10's if possible.

Hemi piston 4.5 stoke 7.045 rod

440 piston stock stroke 6.76 rod. Plenty of room to go up on this piston

Hemi piston, stock stroke 6.86 rod. Add 3/8 to stroke and 1/4 rod length, can't see now way to stay out of oil ring, am I missing something here.

These are 572 Diamond Pistons that I got from Ray Barton for 7.10" rods.

Piston info

Ray prefers the 528. We put a flat tappet 572 in a 3550 lb 70 Cuda (former Super Stocker so it knew how to hook up and go) and went high 9's. That was a drag car with slicks and 5000 converter. Modern flat tappet, single 4 bbl, 528/540/572 engines, done well, make over 800 hp.

Sorry, I'm not following what you are saying. Put what 2 side by side? But, compression height on a hemi piston is not to the top of the piston.

Nevermind Rick, I figured it out. The "perspective" wasn't turned on the stupid software. Operator error! They would have looked identical except for the dome not modeled on top. deleted the post.

I will add, my piston was for a standard deck height with 7.1 rod. My deck being down .130 I found a 7.045 rod, still a little tall but I'll take it up with a thicker head gasket.

Modern pistons have.990" pins and much smaller ring stacks. That helps this all fit together.

Thank you all for your input. I will start gathering parts for the build. Most likely will go with the 540. I will check with Barton and Tim for rotating assemblies before doing anything. Appreciate your replies.