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destroked 290 crank |
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pfordamx 
AMC Apprentice 
Joined: Sep/13/2010 Location: OKC Status: Offline Points: 173 |
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 Topic: destroked 290 crankPosted: Nov/07/2017 at 10:12pm |
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a couple years ago at cordova someone had a destroked 290 crank forsale that we passed on does any know who that was and or might have contact info?
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motorhead_1
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Joined: Apr/16/2014 Location: AZ Status: Offline Points: 1006 |
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Posted: Nov/08/2017 at 2:38am |
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destroke it and rev it to the moon!! i like that idea!
what would you destroke it to? 250-ish? rev to 11k! would sound sweet
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69 SC/Rambler tribute 401/th400, 68 Rebel SST LSA, 66 F100 460/c6, 88 Merkur Xr4Ti, 71 Jaguar XJ6 LS1, 08 Supercharged Tundra
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DaemonForce
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Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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Posted: Nov/08/2017 at 4:17am |
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That's a really good idea!
 I'm interested in this. It will most likely be a flat end crank unless it's a billet product but WOW! I'm usually working with the volcano end version so I hope that's the case. It might be possible to work with if I can get the crank neutral balanced and mill out the pilot hole to modern spec for the type of manual transmission I have in mind but a high flowing 273 is a high HP high torque screamer! I could flog 680HP out of that @10K. It would peak 420lb-ft but it would be the longest valley in the rpm band. Probably between 6500-7500. All of this before bolting up a shiny new 10-71! |
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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pfordamx
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Joined: Sep/13/2010 Location: OKC Status: Offline Points: 173 |
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Posted: Nov/11/2017 at 10:45pm |
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we run a local heads up NA class that below 320 cubes doesn't have a minimum weight and i was trying to think of a way to make get a 4.08-4.12 bore block under 320 cubes take a 290 crank and offset grind destroke it to use 1.85 journal nascar rods would leave you with a 3.04 inch stroke maybe with some welding get that down to 3.00 2.99 put some good heads on top of it and make power at 8500rpm or so at 319 cubes.
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Red20
AMC Addicted
Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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Posted: Nov/12/2017 at 1:02am |
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That would be a fun autocross engine to run screaming the entire way around a course.
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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jpnjim
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Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Posted: Nov/12/2017 at 6:14am |
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Too bad 320 CID is a tough size to get an AMC to, because that sounds like a fun class.
There were some "flat plane" Indy Car cranks that were built for AMC's Indy effort, but that engine was 209" and I think the cranks were around 2.5" stroke. Even with a 401 block they'd be too small. Too bad, because I don't think many people have ever found a use for them beyond as a giant paperweight. |
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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jpnjim
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Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Posted: Nov/12/2017 at 6:28am |
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http://theamcforum.com/forum/aluminum-v8-amc-indy-engine_topic78554_page1.html
Looks like the Indy crank was just 2.36"! (and flat plane/needs a custom cam + strange balancer & maybe other "issues") Even with a .030" over 401 block it would just be 261 cubes lol What a screamer tho! |
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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tomslik
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Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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Posted: Nov/12/2017 at 7:33am |
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I've got a 290/343 crank that's got a bad journal but it's cast if you need one to play with
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67 american 290/4speed |
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amc67rogue
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Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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Posted: Nov/12/2017 at 6:06pm |
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290 block with a 390 crank is 315. With a 401 crank it's a 324.9 .
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Keith Coggins 67Rogue X code
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Red20
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Joined: Jan/29/2013 Location: Oceanside CA Status: Offline Points: 1556 |
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Posted: Nov/12/2017 at 6:27pm |
I think the idea being discussed here is a SHORT stroke crank, specifically an offset ground 290 crank in a bigger bore block for a quick, high revving small displacement V8. |
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1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER |
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amc67rogue wrote: