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spike 
AMC Fan 
Joined: Jun/01/2018 Location: Colorado Status: Offline Points: 16 |
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 Posted: May/12/2019 at 8:56pm |
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its not cracked, so I'll look for a shop that can do that. Thanks!
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69 ambassador 390
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Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Posted: May/17/2019 at 1:41am |
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uploads/3086/My_390_on_stand.aviHere's the movie. Headers are not on yet and the exhaust will be much louder in the car. I'll have to cut down the oil pressure a bit to keep the gears alive. 80+lbs hot at 3000 and 30+ at 550 idle. I have no special oil mods or lines, just good clearances and attention to detail. The cam bearing fitment is critical. The stock oil filter bypass leaks like a sieve and it was eliminated. used,300,000 mile stock timing cover was put back on in place of the Bulltare one I had on it. There was too much play in the shaft bores for me to get a good side clearance. This re-do was instigated with only a few hundred miles on the old build because of a wicked shake at 2500 and tanking oil pressure, (20 hot idle and 40 hot at speed). This time I installed my own cam bearings and reamed them to fit the cam as well as fixing up the old stock AMC cover. No oil mods or lines. This one is a cruiser.
Well, I can't find a way to upload a movie that is not YouTube or Adobe flash????????? What the $%&*
Edited by 69 ambassador 390 - May/17/2019 at 1:53am |
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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Greyhounds_AMX
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Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: May/17/2019 at 12:47pm |
Yep, I'm coming up with 9.69 static, and 7.31 dynamic. Should be perfect for pump gas.
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1968 AMX 390 w/T5
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69 ambassador 390
Supporter of TheAMCForum
Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Posted: May/18/2019 at 12:34am |
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Greyhound, how did you come up with the dynamic? Did you plug in the cam specs also?
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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Greyhounds_AMX
AMC Addicted
Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: May/18/2019 at 7:47am |
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That's from my cam spreadsheet in Excel. I was using 288 adv and 224 at 0.050 for the intake lobe. It makes some assumptions about ramp rates and symmetry for the "custom" cams you enter, but should be close.
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1968 AMX 390 w/T5
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Greyhounds_AMX
AMC Addicted
Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Posted: May/21/2019 at 10:21am |
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Do you have the cam card for your cam? On the Herbert website they show a 3N grind in their big table of cam grinds, but it's 279/284, 218/224, 0.494/0.500, 112 LCA, 108 ICL.
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1968 AMX 390 w/T5
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69 ambassador 390
Supporter of TheAMCForum
Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Posted: May/22/2019 at 1:29am |
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They must have changed the grind. The numbers from my post are from the cam card.
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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Trader
AMC Addicted
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6910 |
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Posted: May/22/2019 at 8:06am |
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I just installed a Lunati and the Cam Card was not the same as the order "specifications".
Talked to their technician and they are updating everything as the grind specifications (and previous Cam Card) came from the drawings. The Cam Cards are now done by measuring. 0.484" lift turns out to be 0.493" lift, quite a bit different, who knew you actually have to measure? Maybe this is a new industry standard, measuring! |
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Red Devil
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Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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Posted: May/22/2019 at 10:41am |
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General purpose hydraulic cam masters typically are designed for a small block Chevy lobe. A Chevy master ground on an AMC core will have slightly different timing events. Unless they have a master for an AMC, or can adjust the program to suit, you generally have to fully degree the cam to verify timing events.
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69 ambassador 390 wrote: