I will stop in on Monday to see this friend of mine that had this 572 built and it was done by FHO a few years ago and try to get some specs you have asked for. I also will stop in and see another friend that built a 605 World Block FHO ported Stage V heads and ask him about how much compression he has in this street motor. I believe the Cam Shaft has 630 lift but not sure on the duration. It made around 830HP on the dyno on real good gas but he pulled back some timing and other things to run on pump gas and to make it more streetable. Still is a beast in his 68 Runner. You might want to talk to FHO and ask Tim what he would recommend for a Cam and Compression. There are plenty on here that have had more hands on experience than I do building this kind of street Hemi motor. My stuff is smaller cubes 430 to 450, high rev, big duration, and lift cam and 12 1/2 compression high dome pistons with planed heads making more that 12 1/2 to one compression and not really fun making it not ping on the street unless real gas is added to the gas tank. Would rather put good fuel in than take some things out of the motor. But I have been interested lately in building a bigger motor keeping the RPMs down and taking some weight out with an all Aluminum Motor to have my Challenger making the car weigh in just over 3000 lbs. and run on pump gas.

FWIW here is what I am using in my 572" .It is more cam than you need though.
CP 10.5 to 1 pistons . CNC ported Stage V heads. Comp Cams solid roller from Dwayne Porter approx. .670" lift 270* duration 112 LSA .
Runs fine on pump gas no knocks or pings or run on after shut off.
Mark

Tim of FHO was very helpful on getting me parts for my 472. It was in a car I bought and never ran quite right. He sold me a set of stage V heads, intake and a comp cam he had them grind. That cam isnt very wild but 3000 and up it acts completely different. Runs good. You might want to give him a call.

I bought the cam from Tim at FHO along with all of the top end parts, it is one of his custom Comp Cams grind, grind # FHO57224X2
I'm sure Comp won't sell that cam grind to anyone other than Tim
It idles nice, has plenty of vacuum at 1000 RPM idle for this cars power brakes and it made 704 Ft. Lbs. torque at 3500 RPM at WOT on the DTS engine dyno with peak torque of 730 Ft. Lbs.at 4900 RPM, at 3500 RPM it made 469 HP and made 798 peak HP at 6500 RPM where we stop the pulls at do to it would start to loose HP after 6500 RPM
AKA aside this customer is a show car guy who wants a real nice driving 1971 Hemi custom clone Challenger to drive here in central ,OR, and a car his wife can drive also without worrying about the car doing donuts when they step on it to WOT
Me being me it was really hard to not shoot for the moon on both torque and HP on this build, I was hoping for 800 to 850 HP around 7000 RPM at WOT.
This motor has beehive valve springs from FHO with only 450 Lbs. opened pressure with .600 valve lift
I had Comp grind me a solid roller cam for it first with different specs than Tim FHO grind but they sent me a core with six bolts on the front for the timing gear and I sent it back, bottom line is I got into a tiff with them on that core and ended buying and using this one from Tim
The customer is happy with these results, he may be greatly surprised and hopefully loves the results of this motor in his car no matter what the dyno sheets show

Well I don't think you'd like my cam. Bullet solid roller, .767/.686, 288/292@.050 113 center. I didn't pull it past 6800 rpm, the power was still climbing. With the old heads it made 852.8hp@5800rpm.

subscribing....

It'll probably be awhile before mine is operational, I'm still in the data collecting stage and can see that will never end, but it should end up between 10.2 and 10.7:1.

My 572 hemi is 11:1 and no issues at all on pump 93. Been 9.54 at 140.4 mph at 3800 lbs naturally aspirated on pump gas.

A true 10:1 with iron heads here & a VERY small cam. 93 octane daily driver. 30 deg spark advance.

528ci, 235 @ .050, laziest easiest-starting Hemi you'll ever see, lol. It actually does good on gas though, and its no slouch at the strip either.

This is a great thread, good info, thanks again Gents.

Any more cam/compression combinations ?

9.5 to 1 with stage V heads, StageV rockers, crane 248@50 .630 lift 112 lsa, stageV intake port matched and ported for magnafuel shear plates, 2 quickfuel 770 vacuum secondary carbs with annular boosters on the primaries and downlegs on the secondaries. Desktop dyno showed it at about 650 hp and 700 tq. Engine has only ran for 5 minutes since it was built.

Here's a visual aid:

Dwayne Porter spec'd Comp Cams solid roller 276°/284° @ .050", .672"/.651" lift, 112 LSA
Mild lobes w/ light springs (PAC 1243) and good lifters (Isky Red Zones)

ZIPPY, I don't think that's enough squish to do any good.

Agreed h.e., it's not going to do much of anything with this piston. Especially once I put a gasket on it.
I've got roughly 13cc of dead space around the edges (I CC'd and did the 1" down measurements etc) and although I could cut the block, I have
no desire to push any limits.

As they say a picture is worth a thousand words, so anything to help visualize the stuff I figure is a good idea.

Cam wise I'm going to start with 276/280@.050 on 112, .420 lobe lift. Not 100% sure on rocker ratio or gross valve lift yet.
A local horsepower God tells me the cam is about 20 degrees too big for my application, so it will be interesting to put that thought to the test.
What I have should be good enough to get it running and decide if I like it, at least.

Zippy...is your shortblock assembled already? I hope you mocked up the valvetrain and checked pushrod clearance on the block and heads before you started putting it together.
I had a LOT of time in checking clearance and grinding for the pushrods on my KB block. Dan Costello also mentioned it would likely be an issue w/ the World block also. I haven't built the World block hemi I have here yet so can't comment for sure.

Hey Chip,
No it's not assembled yet, this was a mockup without rings to look at what I could, with the pieces I had.
It's back apart now and the lower end is out for balancing.

Thank you for that advice...folks also PM'd with similar statements, so I am expecting to correct problems.

Couldn't mock up any valvetrain yet since my parts collection is incomplete. And I think I want something better
than stock rockers so I will go shopping pretty soon.

Rich

I saw one of the Sox and Martin SS/A cars in the tear down barn at the 1974 NHRA Winternationals , Jake King had removed the stock castings around the pushrod tubes in the block and heads. Where is the surprised Imogy, help!
I had to grind the KB aluminum street hemi block on three of the 7/16 single tapered exhaust pushrod in the stock machined grooves in that block, all the others cleared fine.
Mock up and check every part up before final assembly on every Hemiroid motor !

I had to do a lot of clearancing on my KB block for a typical straight 3/8" pushrod. Only slight clearancing on the heads, but even the head gaskets needed grinding on so the pushrod didn't rub them.
Probably had the heads on and off the motor 40 times, lol.

Hemienvy I PMed you the information on my friends Cam Shaft, World block, Stage V heads street style the 572. I was wondering what Stage V heads you own. I was at the other guys house today and he can not find his Cam Specs to his 605 but will look for them.