Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2628411
03/03/19 08:51 PM
03/03/19 08:51 PM
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Joined: Jan 2003
Posts: 5,122 Chicago Blackhawks
hemicar1971
master
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master
Joined: Jan 2003
Posts: 5,122
Chicago Blackhawks
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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.
1971 HEMI E BODY REGISTRY
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2628430
03/03/19 09:34 PM
03/03/19 09:34 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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master
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Mt. Eden Ky.
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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
Last edited by Hemi Allstate; 03/03/19 10:25 PM.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2628480
03/03/19 11:25 PM
03/03/19 11:25 PM
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Joined: Aug 2003
Posts: 43,309 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,309
Bend,OR USA
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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
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2628680
03/04/19 02:14 PM
03/04/19 02:14 PM
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Joined: Jan 2003
Posts: 17,914 S.E. Michigan
ZIPPY
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I Live Here
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Posts: 17,914
S.E. Michigan
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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.
Rich H.
Esse Quam Videri
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2628712
03/04/19 03:29 PM
03/04/19 03:29 PM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Posts: 13,402
Marion, South Carolina [><]
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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.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2629465
03/06/19 12:56 AM
03/06/19 12:56 AM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
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Posts: 4,785
Utah and Alaska
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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.
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: quickd100]
#2629603
03/06/19 12:30 PM
03/06/19 12:30 PM
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Joined: Jan 2003
Posts: 17,914 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
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Posts: 17,914
S.E. Michigan
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With a 4.5" bore there is a "quench ring" around the outside edge of the Piston/head that hangs over the bore. Here's a visual aid:
Rich H.
Esse Quam Videri
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: an8sec70cuda]
#2629656
03/06/19 02:12 PM
03/06/19 02:12 PM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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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. 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)
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: hemienvy]
#2629725
03/06/19 07:16 PM
03/06/19 07:16 PM
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Joined: Jan 2003
Posts: 17,914 S.E. Michigan
ZIPPY
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I Live Here
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S.E. Michigan
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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.
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: ZIPPY]
#2629906
03/07/19 10:27 AM
03/07/19 10:27 AM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
Joined: Jan 2003
Posts: 13,402
Marion, South Carolina [><]
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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.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: ZIPPY]
#2629996
03/07/19 01:53 PM
03/07/19 01:53 PM
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Joined: Aug 2003
Posts: 43,309 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,309
Bend,OR USA
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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 !
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: Cab_Burge]
#2630000
03/07/19 01:58 PM
03/07/19 01:58 PM
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Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,402
Marion, South Carolina [><]
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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.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 572 Hemi: Pump gas compression with no squish/quench
[Re: an8sec70cuda]
#2630921
03/09/19 10:00 PM
03/09/19 10:00 PM
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Joined: Jan 2003
Posts: 5,122 Chicago Blackhawks
hemicar1971
master
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master
Joined: Jan 2003
Posts: 5,122
Chicago Blackhawks
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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.
1971 HEMI E BODY REGISTRY
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