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290 pistons |
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carnuck
AMC Addicted Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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Wonder if the 4.0L pistons would work in a 290 build? I have a couple dead 4.0Ls ('91 and '93) I can steal the old pistons from.
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Class Guy
AMC Addicted Joined: Jul/02/2007 Location: Arkansas Status: Online Points: 969 |
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Four issues:
1) The compression distance of the 4.0 pistons is the same as 2-bbl 290 pistons, which will put the piston about .050"-.060" in the hole and not be good for compression.
2) The dish in the 4.0 pistons is around 12 cc which is much more than stock pistons. Again, not good for compression.
3) Valve relief pockets will have to be machined into the pistons.
4) You will have to bore the 290 block .125". Be sure to sonic check the block first. I have not seen a 290 block that could not be bored that much, but I have only checked 6.
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carnuck
AMC Addicted Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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I guess I'll save those for when I do the 304 then.
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amx007
Supporter of TheAMCForum Joined: Dec/31/2008 Location: stone pk Status: Offline Points: 750 |
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I’d like to know a price for a set 30 over ty 290
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dream red white and blue
1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Egge has them, $444 set:
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2177 |
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reading this post don't under estimate the performance of the 290 with alittle work they run and hold up very well my 290 in my rambler is a .030 over 10.5.1 forged piston balanced torqer intake 750 carb 540 lift 304 duration very street able 410 gear in the rear 4sp run 12.30 in a 1/4 6000 launch comes thru the trap at 5500 I say not bad for a small cubic inch motor and yes it will put a hurt on a small block chevy or ford there is no valve work or porting done on he heads that this years project this motor surprised me on it performace
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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258 pistons should work, it has the same bore as the 290 (3.75"). Not sure about compression height and dish though, could be the same issues as the 4.0L -- a little lower compression when used in a 290.
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Frank Swygert
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nextofkin
AMC Apprentice Joined: May/24/2018 Location: North Carolina Status: Offline Points: 41 |
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mixed up show your build and work on the heads when you do it
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