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Help on cam selection |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7950 |
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Lunati: 3 35 43 -(5) overlap -(2) Elgin: 4 34 44 -(6) overlap -(2) Isky: 2 34 38 -(2) overlap 0
Edited by Sonic Silver - Feb/25/2018 at 10:21am |
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pjsst
AMC Fan Joined: Feb/20/2018 Location: northmanchester Status: Offline Points: 10 |
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Man all this info kinda hard to take in LMAO
Kinda leaning towards the comp 268 but the big question is could i run this with out any machine work done to the heads ..or what set up could i run with out taking the heads off for machining |
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HughesEngines
AMC Fan Joined: Feb/26/2018 Location: Illinois Status: Offline Points: 1 |
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We are Hughes Engines, a Mopar exclusive machine shop. We just joined this AMC forum this morning (2/26/18). We are looking to provide more AMC services, and in this case, I think we can help. We have some exclusive "real" Mopar cam lobes that are designed to take advantage of the large 0.903" lifter diameter shared with both AMC and Mopar. All of our competitors use common GM 0.846" lifter cam lobes. Grinding lobes for the larger .903" lifters gives you faster rates of lift, more lift, and more area under the curve - giving you more power than the .846" lobe with the same sized (duration @ .050") cam. If you look at our website, http://www.hughesengines.com - www.hughesengines.com under " http://www.hughesengines.com/TechArticles/2choosingacam.php - Choosing a cam", we ask you 22 questions to make sure you get the best cam for your combination.
We also guarantee our cams will outperform our competitors (of the same size) or we'll buy ours back. Pick a cam or lobe and we'll get you a "real" AMC cam. You will need new springs and lifters. We can supply them too.
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Perhaps you meant to say all EXCEPT for Crane, Engle, Lunati, and Howards. These four manufacturer's offer off-the-shelf AMC cams with 0.904 specific lobe profiles.
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1968 AMX 390 w/T5
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Babycakes
AMC Apprentice Joined: Feb/24/2010 Location: Henderson, Nv Status: Offline Points: 145 |
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I was considering The Isky 270-HL. The catalog lists 9.5:1 CR. Is this minimum recommended?
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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The Isky 270-HL would give a DCR of about 6.6 with the stock 360 compression ratio, which is pretty typical for engines targeting 87 octane fuel. More compression would be better of course, and the Isky would be happy at 9.5:1 static CR as well, but with 93 octane of course.
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1968 AMX 390 w/T5
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