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destroked 290 crank |
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Brad 
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Joined: Aug/07/2016 Location: Canada Status: Offline Points: 433 |
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 Posted: Nov/13/2017 at 8:42pm |
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I have no idea if it's worth the effort/expense, I was hoping someone with more experience would chime in?
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mixed up
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Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2178 |
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Posted: Nov/14/2017 at 2:28am |
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sirdigg ask how many rpm can a amc take before blowing the valve train
I spin my little 290 4spd to 6k at launch and it comes thru the traps in a 1/4 at 6k been doing a long time balance 10.5 motor some think im crazy but thee has been no issue so fare |
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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Class Guy
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Joined: Jul/02/2007 Location: Arkansas Status: Offline Points: 969 |
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Posted: Nov/14/2017 at 8:03am |
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All it takes is $$ to make a bullet proof valve train. 6K rpm? You haven't come close.
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Addicted to acceleration.
Owner and Admin for www.classracerinfo.com |
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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/14/2017 at 9:48am |
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Keith Coggins 67Rogue X code
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Brad
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Posted: Nov/14/2017 at 1:29pm |
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Looks like they went the other way and put a 401 crank in a 360 block?
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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/14/2017 at 1:34pm |
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I had a 401 crank I was thinking of putting in a 360 block once. Never ended up doing it. I wasn’t sure if I was gonna have the journals cut for Chevy rods or go with custom pistons or AMC rods. Sold it eventually.
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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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SC397
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Posted: Nov/14/2017 at 1:58pm |
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Oops, I misread it. You would have to use the 360 rods on the 360 crank but, you would have to do something with the piston pin. 360 = .930 and 401 = 1.000. Or, simply have a custom 401 piston made with the 360 pin. |
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Brad
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Posted: Nov/14/2017 at 5:41pm |
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Just learning .... why would you need to use 360 rods on a 360 crank? Dimensional wise they look the same as 304, 360, 343. I was going by this http://www.purpleized.com/AMX/engine.shtml I see the wrist pin differences but custom pistons would take care of that. I googled 4.185 bore pistons and lots of off the shelf options came up . I haven't done it yet but one would have to do the math and find a compression height that would work with a aftermarket connecting rod . Common lengths are 6" , 6.125" and 6.2" Then you would need to get the right thickness to suit the crank. Then find a good balancer . I agree if you already have a 401 why would you bother, but I was thinking of a competition engine that likes rpm ( circle track, autocross, road racing etc... ) or if your not able to use/find a 401 crank. It also keeps my mind busy....LOL No such thing as "can't"  I know from circle track racing days the 377 Chevy combo makes a great engine. ( 400 block, 350 crank) Stroker engine are fun , build them with a longer stroke for torque or big bore short stroke for RPM , different strokes for different folks as the saying goes. Depends on the application. For a street cruiser a stock 304 would get you down the road just fine. I've built a Buick 455 for a past project and I'm surprised how similar AMC V-8's are. ( timing cover, oiling system etc... ) Edited by Brad - Nov/14/2017 at 5:44pm |
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Brad
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Posted: Nov/14/2017 at 5:50pm |
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Sorry to the original poster , hope it's ok to post and I'm not hijacking your post. I'm new to AMC's and thought it was pretty cool . Just thinking 360 cranks would be much easier to come by that a 290? I didn't know that engine existed till I read your post !
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Ken_Parkman
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Posted: Nov/14/2017 at 8:31pm |
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A shorter stroke would reduce piston speed and make the heads less efficient for a given cubic inches. The short stroke/rpm theory does not do well in modern times with better pistons, rods, etc. unless you are into truly stupid rpm to get the piston speed back up. Anything below 8000 rpm put a longer stroke in it unless there is a particular rule or race class you are trying to work with.
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matty 401 wrote: