572-13 heads, some good news! Guess potential hp.
#3020530
03/03/22 03:38 PM
03/03/22 03:38 PM
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gregsdart
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Got a message from. Todd Marsh, my cnc385 heads are ready to ship, that was a couple days ago. Todd will be doing a valve job on them and if there is time, will have a little extra TLC done to the ports beyond the cnc work. The valves will be 2.30 intake, 1.88'exhaust. Also the installed height is more on the 572 heads because the valves are longer. My -1 heads were at the limit with max keepers and retainers at 2.070 , no shims required😳. So i can transfer my springs ,retainers and keepers to the new heads. I might want to change keepers to reduce shims needed. Hopefully valves will be available, but pistons are eight to ten weeks out. Been playing with the welder; merge collecters . Got my 16.5 lb Dakota Li battery, 60 ah, cranking, alternater friendly. Wilson prepped 3X intake. Headers will be 2 1/8 to 2 1/4 to merge 3.5 to 4 inch. Alky injected, 2000+ cfm Terminter constant flow setup. Hoping i can get 14.5 compression without compromising flame travel from the dome. Pistons will have .9 (.036) top and second rings, 3mm lt oil. Cam .868 gross intake, .848 net, .818 gross exhaust lift, net .798. duration @ .050 is 284/296/114 in at 111. I hope to see 1030 hp at 7400. What do you think? It will be a while before dyno day, but i do plan on dynoing. Car with driver should be 2865 race weight.
Last edited by gregsdart; 03/03/22 03:41 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3020536
03/03/22 03:51 PM
03/03/22 03:51 PM
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Joined: May 2004
Posts: 12,418 Taxes & Virus's R-US, NY
Dragula
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Got a message from. Todd Marsh, my cnc385 heads are ready to ship, that was a couple days ago. Todd will be doing a valve job on them and if there is time, will have a little extra TLC done to the ports beyond the cnc work. The valves will be 2.30 intake, 1.88'exhaust. Also the installed height is more on the 572 heads because the valves are longer. My -1 heads were at the limit with max keepers and retainers at 2.070 , no shims required😳. So i can transfer my springs ,retainers and keepers to the new heads. I might want to change keepers to reduce shims needed. Hopefully valves will be available, but pistons are eight to ten weeks out. Been playing with the welder; merge collecters . Got my 16.5 lb Dakota Li battery, 60 ah, cranking, alternater friendly. Wilson prepped 3X intake. Headers will be 2 1/8 to 2 1/4 to merge 3.5 to 4 inch. Alky injected, 2000+ cfm Terminter constant flow setup. Hoping i can get 14.5 compression without compromising flame travel from the dome. Pistons will have .9 (.036) top and second rings, 3mm lt oil. Cam .868 gross intake, .848 net, .818 gross exhaust lift, net .798. duration @ .050 is 284/296/114 in at 111. I hope to see 1030 hp at 7400. What do you think? It will be a while before dyno day, but i do plan on dynoing. Car with driver should be 2865 race weight. I would take the clover out of the opening of the intake....Mine went faster without it.....Big motors, want big plenum.
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: Dragula]
#3020546
03/03/22 04:13 PM
03/03/22 04:13 PM
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Joined: Jan 2003
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JERICOGTX
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Have you started working on headers yet Greg?
69 GTX
68 Road Runner
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: JERICOGTX]
#3020570
03/03/22 06:23 PM
03/03/22 06:23 PM
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gregsdart
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Have you started working on headers yet Greg? Been tied up, got as far as these colecters are done. I used Si bronze wire to keep from warping the slip fit. They are very tight before welding, it may have been too much to weld qith steel. I may try steel on the tubes, still learning my new welder along with getting some badly needed skills in that dept.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: AndyF]
#3020571
03/03/22 06:25 PM
03/03/22 06:25 PM
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gregsdart
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Parts look great. I'd think that would be good for more than 1000 hp as long as everything is put together right. You might end up playing with the cam specs a bit although that sounds like a very reasonable starting point. I called Mike Jones, who cut the cam, and he figured it would be very close, to eun it and see what i get.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3020610
03/03/22 09:44 PM
03/03/22 09:44 PM
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JERICOGTX
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Have you started working on headers yet Greg? Been tied up, got as far as these colecters are done. I used Si bronze wire to keep from warping the slip fit. They are very tight before welding, it may have been too much to weld qith steel. I may try steel on the tubes, still learning my new welder along with getting some badly needed skills in that dept. Let me know when you want to use my tubing templates.
69 GTX
68 Road Runner
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3020677
03/04/22 07:41 AM
03/04/22 07:41 AM
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Joined: Jan 2003
Posts: 2,937 A shed in England
Tig
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Got a message from. Todd Marsh, my cnc385 heads are ready to ship, that was a couple days ago. Todd will be doing a valve job on them and if there is time, will have a little extra TLC done to the ports beyond the cnc work. The valves will be 2.30 intake, 1.88'exhaust. Also the installed height is more on the 572 heads because the valves are longer. My -1 heads were at the limit with max keepers and retainers at 2.070 , no shims required😳. So i can transfer my springs ,retainers and keepers to the new heads. I might want to change keepers to reduce shims needed. Hopefully valves will be available, but pistons are eight to ten weeks out. Been playing with the welder; merge collecters . Got my 16.5 lb Dakota Li battery, 60 ah, cranking, alternater friendly. Wilson prepped 3X intake. Headers will be 2 1/8 to 2 1/4 to merge 3.5 to 4 inch. Alky injected, 2000+ cfm Terminter constant flow setup. Hoping i can get 14.5 compression without compromising flame travel from the dome. Pistons will have .9 (.036) top and second rings, 3mm lt oil. Cam .868 gross intake, .848 net, .818 gross exhaust lift, net .798. duration @ .050 is 284/296/114 in at 111. I hope to see 1030 hp at 7400. What do you think? It will be a while before dyno day, but i do plan on dynoing. Car with driver should be 2865 race weight. @ 4023lb running low 9.50's @ 142+ HP comes out at around 915 using wallace (4.53 x 4.5 580ci combo) We use the older larger intake volume 572-13 heads, heavily hand ported. We have .768 lift gross 12.5:1 C/R and run on pump gas. With .100" more lift, more CR and alcohol I'd be wanting be wanting to bust 1000hp, I'd be surprised if those mods would give me 120hp though but I have no experience with alcohol
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: rb446]
#3020818
03/04/22 02:32 PM
03/04/22 02:32 PM
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Joined: Jan 2003
Posts: 19,384 Las Vegas
Al_Alguire
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The heads have the potential to make 1000 in a good bracket piece for sure. Should be 400+ cfm and 385CC port and a 2.300"intake valve it shoudl be more than capable of that.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: Tig]
#3059760
07/16/22 09:56 PM
07/16/22 09:56 PM
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Joined: Jan 2003
Posts: 10,020 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Got a message from. Todd Marsh, my cnc385 heads are ready to ship, that was a couple days ago. Todd will be doing a valve job on them and if there is time, will have a little extra TLC done to the ports beyond the cnc work. The valves will be 2.30 intake, 1.88'exhaust. Also the installed height is more on the 572 heads because the valves are longer. My -1 heads were at the limit with max keepers and retainers at 2.070 , no shims required😳. So i can transfer my springs ,retainers and keepers to the new heads. I might want to change keepers to reduce shims needed. Hopefully valves will be available, but pistons are eight to ten weeks out. Been playing with the welder; merge collecters . Got my 16.5 lb Dakota Li battery, 60 ah, cranking, alternater friendly. Wilson prepped 3X intake. Headers will be 2 1/8 to 2 1/4 to merge 3.5 to 4 inch. Alky injected, 2000+ cfm Terminter constant flow setup. Hoping i can get 14.5 compression without compromising flame travel from the dome. Pistons will have .9 (.036) top and second rings, 3mm lt oil. Cam .868 gross intake, .848 net, .818 gross exhaust lift, net .798. duration @ .050 is 284/296/114 in at 111. I hope to see 1030 hp at 7400. What do you think? It will be a while before dyno day, but i do plan on dynoing. Car with driver should be 2865 race weight. @ 4023lb running low 9.50's @ 142+ HP comes out at around 915 using wallace (4.53 x 4.5 580ci combo) We use the older larger intake volume 572-13 heads, heavily hand ported. We have .768 lift gross 12.5:1 C/R and run on pump gas. With .100" more lift, more CR and alcohol I'd be wanting be wanting to bust 1000hp, I'd be surprised if those mods would give me 120hp though but I have no experience with alcohol Update! I am having a callies crank regound to 4.560 stroke, have ordered Molnar 7.00 long power adder+ rods. That will change the shortblock from 549 cubes to 580. The heads were cnc 385, and now have been worked on by larry at Flow Tech 2 for extra flow. So now it is wait for Jesel rockers and Diamond pistons.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3060375
07/18/22 08:50 PM
07/18/22 08:50 PM
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Joined: Jan 2003
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gregsdart
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My parts are on the way! Yippee! One pair, 572-13cnc 385 finished up by Larry smith, Jesel kit, 1.7 ratio, Diamond pistons. It was a long wait, but Todd Marsh of Marsh Performance/MopartsConnection , gave me a better price than I expected, and has been great to work with. Thanks Todd, for helping with this build and a number of other questions over the years. I will be taking the heads in for a flow test to compare with my old heads, testing on the same bench. But the end all of any build like this will be more than the flow numbers. But they are fun to look at ![smile smile](/ubbthreads/images/graemlins/custom/smile.gif)
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3060378
07/18/22 08:58 PM
07/18/22 08:58 PM
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JERICOGTX
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With a little bit of luck, you just might be able to get the car out by the end of the season. How are the new headers coming along?
69 GTX
68 Road Runner
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3060379
07/18/22 09:00 PM
07/18/22 09:00 PM
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Joined: Mar 2003
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EvilB1Dart
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Congrats, Greg! Either way it’s going to make some stream. Best of luck with the build and I hope it meets/exceeds your expectations man! Get after it!!
Wes
"Any fool can know. The point is to understand"
- A. Einstein
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: JERICOGTX]
#3060423
07/18/22 11:08 PM
07/18/22 11:08 PM
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gregsdart
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With a little bit of luck, you just might be able to get the car out by the end of the season. How are the new headers coming along? Jeff, i am fitting up the drivers side, pass side ready for welding. Wes, it should run. How much faster than 8 .50 is the question! 2840 race weight, 1,000+ hp .
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3060456
07/19/22 04:49 AM
07/19/22 04:49 AM
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Joined: Oct 2015
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rb446
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With a little bit of luck, you just might be able to get the car out by the end of the season. How are the new headers coming along? Jeff, i am fitting up the drivers side, pass side ready for welding. Wes, it should run. How much faster than 8 .50 is the question! 2840 race weight, 1,000+ hp . Hey Greg, if it makes an honest 1030 on track then> 60 Foot E.T. : 1.14 Seconds 1/8 Mile E.T. : 5.15 Seconds 1/8 Mile Trap Speed : 131.89 MPH 1/4 Mile E.T. : 8.17 Seconds 1/4 Mile Trap Speed : 164 MPH is possible. ![up up](/ubbthreads/images/graemlins/custom/thumbs_up.gif)
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: gregsdart]
#3060474
07/19/22 08:32 AM
07/19/22 08:32 AM
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Joined: Feb 2005
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pittsburghracer
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With a little bit of luck, you just might be able to get the car out by the end of the season. How are the new headers coming along? Jeff, i am fitting up the drivers side, pass side ready for welding. Wes, it should run. How much faster than 8 .50 is the question! 2840 race weight, 1,000+ hp . Greg did you ever run the car at the 2840 pound weigh? I see the weight listed in your signature it much higher. Good luck to you and many new bests.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: pittsburghracer]
#3060528
07/19/22 11:53 AM
07/19/22 11:53 AM
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gregsdart
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With a little bit of luck, you just might be able to get the car out by the end of the season. How are the new headers coming along? Jeff, i am fitting up the drivers side, pass side ready for welding. Wes, it should run. How much faster than 8 .50 is the question! 2840 race weight, 1,000+ hp . Greg did you ever run the car at the 2840 pound weigh? I see the weight listed in your signature it much higher. Good luck to you and many new bests. John, never raced below 3000#. The new aluminum block is 105 lighter, LI battery iS 25 lbs lighter, and i have lost 30 lbs, looking to drop another 10 by the time i get this back together. So maybe as low as 2820 running without hood. I should be able to post flow numbers for the heads today or tomorrow.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572-13 heads, some good news! Guess potential hp.
[Re: rb446]
#3060538
07/19/22 12:20 PM
07/19/22 12:20 PM
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Joined: Jan 2003
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gregsdart
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With a little bit of luck, you just might be able to get the car out by the end of the season. How are the new headers coming along? Jeff, i am fitting up the drivers side, pass side ready for welding. Wes, it should run. How much faster than 8 .50 is the question! 2840 race weight, 1,000+ hp . Hey Greg, if it makes an honest 1030 on track then> 60 Foot E.T. : 1.14 Seconds 1/8 Mile E.T. : 5.15 Seconds 1/8 Mile Trap Speed : 131.89 MPH 1/4 Mile E.T. : 8.17 Seconds 1/4 Mile Trap Speed : 164 MPH is possible. That would be wild, to say the least! I figure due to average DA of 2200 to 3000 on a good day where i race, maybe 8.30s if it hooks, 8.40s if it doesn't
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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