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500 ci |
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garland performce
AMC Apprentice Joined: Nov/19/2013 Location: sibley mo Status: Offline Points: 172 |
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I don`t have my flow #s in front of me
My S/R heads have the push rods moved over and the roof raised and floor raised with a 2.150 intake valves Have more flow than the 300 cnc head #s you posted with tons of mid flow also have some crazy mid # and still pick up flow over .900 lift
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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Way out of my league, but watching with interest should the Powerball numbers come my way.
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I've finally given up drinking for good...........now I only drink for evil.
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tsanchez
AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4302 |
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I saw a lot of issues with mine as well. I had to machine the heads for the jesel shaft rockers and have them remake the rockers. They dont even machine the heads to jesels specifications . Probably would have been okay for a .650 lift cam but not for what we run. I am going to redo the valve job and do some port work in the bowl area.
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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It sounds like the work you have done on your SR heads are very similar to mine. When you say you raised the floor I am assuming you mean that you welded the floor or it has a ton of epoxy in the floor ? I went with a 2.125 valve because I didn't think there was any way a 2.150 would fit. My SR start backing up at much over .800 valve lift. The main hangup is the vavle size on these heads. I think the CNC300 heads have a lot of potential and will flow a lot my than the SR heads but they are going to need some serious work. When Indy advertises their flow numbers on that head, they either have a crappy bench or the person running them needs some lessons.
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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well......the cnc300 heads survived a pre-mod pressure test. They have now had the seats and the valve job re-done. They went from 360 to 398 cfm at peak with just a valve and seat re-do! This is all on the same bench. It is still a work in progress ! They still have issues, as past 650 lift they are backing up from that number due to flow imbalance and or flow seperation/turbulance. Getting ready to back cut the seats and see what happens. And then some port re-shaping and or epoxy if needed. The goal is to have this peak flow with no turbulence or backup at higher lift levels.
Edited by DragRacingSpirit - Jul/29/2022 at 10:29pm |
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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So far the heads look good and have pressure tested good. The block has not made it to the machine shop yet for a blueprint. It looks good ?
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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tsanchez
AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4302 |
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NIce, im going to be working on the valve job also. Its not the best at all, bowl transition to seat is not good. Flow bench numbers will vary from lace to place, just concentrate on a difference in your test.
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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Just to make sure that everyone understands what I have going on with the research and development of my cnc300 heads everything is on the same exact bench with the same head guy that has worked on everything from tractor pulling stuff, to buick, chevy, mopar, ford, my amc ....etc etc heads. He is very maticulous and right now we are in a learn and discovery mode with a casting he has never dealt with before. He has a lot of experience and that is a big asset. We are on the right track and are making big gains. But this it is going to take some time and lots of effort to get this nailed down to satisfaction.
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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You are starting at the exact same place that were glaring issues with mine. Just the valve job and seats were worth over 30 cfm on the same bench with the same operator.
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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Lenni AMC
AMC Nut Joined: Jun/05/2011 Location: Iceland Status: Offline Points: 420 |
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Any update on this project ?
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AMC Gremlin w/401
6.212 @ 117.01 - 1/8 Mile 9.785 @ 133.11 - 1/4 Mile https://www.youtube.com/channel/UCikyNqrfpMB8VzLd910Hkhg https://rbjracing1.wixsite.com/website |
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