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327 Cam -- "Performance" |
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uncljohn
AMC Addicted Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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Posted: Mar/16/2014 at 3:41pm |
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It would seem to me that if I wanted to have a cam ground for an obsolete engine with no parts available for it that is what Cam Grinder's tech support would be for.
Cams are ground specifically for application. One ground for solid lifters would be incompatible for use with hydraulic and visa versa. The amount of lift available from a cam is best explained by those who actually grind them and something that might be best for a small engine might not be the best use for a larger one, just saying. But then again, having built one or two of each, that is why I contact tech support for data. And as I particularly use Iskenderian them be the folks I talk to. |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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Rebel327
AMC Nut Joined: Jan/26/2014 Location: Toledo Ohio Status: Offline Points: 358 |
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Your cam grinder cannot give you exactly what you want if starting with a stock cam as a core. You can only get what he has to work with. He can change the base circle and provide more lift and perhaps change the ramp angle and so on but the lobes are where they are--cannot move them. If you are having a billet cam made then it is wide open. Not thinking you are heading this route. I would just send in your core and see what they can do with it. You should be able to get around .450" lift and 215-220 duration @ .050". For a 287/327 that is all you will ever need based on heads,etc... Now if you are talking off-set grind crank and overbore for 400 cubes........
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814Kustoms
AMC Apprentice Joined: Sep/07/2013 Location: United States Status: Offline Points: 130 |
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Rebel327 - I believe I was the one who asked you about the cam specs in one of my threads. Not well versed as far as camshafts verses solid/hydraulic lifters go but would this cam you have from Isky work with hydraulic lifters? I'm guessing from one of your previous posts that the difference would be that you'll just get a little more lift with solid lifters over the hydraulic? I remember Lucas660 stating that he didn't go with too big of a cam as he was worried he'd snap a rocker arm. Maybe there might be a greater chance of that happening with solid lifers?
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Funny you say that, but if Ed is still on the green side of the grass
my bet is that they still carry some old and obsolete stuff. Last I heard Ed is still on the air budget... AMC gen 1 v8's were very common at one time in boats and Jeeps also. If anyone had old cams, or will do a first rate re-grind, it's Ed. Boris Badanov |
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Gremlin Dreams
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uncljohn
AMC Addicted Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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Hydraulic lifters, a part that had been first used on the V16 Cadillac in 1930 were placed into use to solve two problems associated with mechanical or solid lifters which were standard for the day. Noise due to the lifter lash needed to compensate for heat expansion and frequent adjustment intervals thus maintenance costs, sometimes difficult. The down side of them is that hydraulic lifters can not follow exotic cam shafts at high rpm and a phenomenon known as valve float sets in, they open but never close causing problems when the pistons run into them. So pretty much in the 50's and 60's a performance engine ran solid lifters and even in the 90's and newer, the size of a hydraulic lifter negated the installation on over head cam engines. My late model Mitsubishi was almost 300,000 miles over due for it's 1st valve lash adjustment due to it's solid lifters and overhead cam shaft configuration. Required to be adjusted every 10,000 miles. I had a tendency to to set them a couple of thousands bigger and listen to them rattle a bit and go as far as I could before having to re-adjust them due to wear and what ever. |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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The valve lash will change a couple thou with heat but the lift stays the same. Net lift that is, gross lift less lash.
The lash on a solid cam is to soften up the "hit" on the valvetrain when it engages the ramps of the cam lobe.
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uncljohn
AMC Addicted Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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Isky customer or tech support I have always found helpful when needed. Isky used to list Cam # 1301 for Rambler V8's 287-327 ( 1957-1966) under a heading of Oldies but Goodies. Call for further information. But no spec's in the catalog.
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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elkyman70
AMC Fan Joined: Dec/10/2011 Status: Offline Points: 10 |
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Are the rocker arms for the '66 327's 1.5? Am planning a regrind and have 3 different specs but one of them uses a 1.6 rocker arm ratio. Just want to try to compare apples to apples.
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Rebel 327
AMC Addicted Joined: Feb/04/2009 Location: Ohio Status: Offline Points: 596 |
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The cam card says it all. It is what it is.
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Rebel 327 4-speed
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MarlinSteve
AMC Nut Joined: May/11/2009 Location: Lake Geneva WI Status: Offline Points: 272 |
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I was under the impression that the .018 valve lash was for heat expansion so I'm thinking that it would be closer to the .410 lift when the engine is hot. |
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