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Hot street 343 build

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pipefactory View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pipefactory Quote  Post ReplyReply Direct Link To This Post Topic: Hot street 343 build
    Posted: Jun/06/2018 at 7:49am
I decided my 562 hp 401 in my rambler was too much for the street.
It has a 4 speed with 410 gear now and is fun to drive but would be better with less motor.
I have a low mile standard bore standard crank 343 I'm building.
I have new badger flat tops that will end up .010 in the hole after decking and squaring the block.
Already have the milodon timing drive all mocked up as well as timing cover.
I'm going with a solid crane with 238 248 dur. .512 .533 lift 112 lisa
I'm swiping the sr401 heads that flow 333 at 700 of my 401
torker intake and my e85 carb
Should end up 11.52 and run e85.
Any input?

Edited by pipefactory - Jun/06/2018 at 8:09am
Face distorting torque
10.99@121 mph
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WesternRed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jun/06/2018 at 8:06am
Sounds like a pretty stout 343, would like to see what it makes when done.
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pipefactory View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pipefactory Quote  Post ReplyReply Direct Link To This Post Posted: Jun/06/2018 at 8:17am
These are the original pistons.
Sorry about the crappy aluminum welding, I got a new high tech welder and didn't read the instructions. I'm used to my giant old Miller.



Edited by pipefactory - Jun/06/2018 at 8:26am
Face distorting torque
10.99@121 mph
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1982AMCConcord View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Jun/07/2018 at 10:01am
Originally posted by pipefactory pipefactory wrote:

I decided my 562 hp 401 in my rambler was too much for the street.
It has a 4 speed with 410 gear now and is fun to drive but would be better with less motor.
I have a low mile standard bore standard crank 343 I'm building.
I have new badger flat tops that will end up .010 in the hole after decking and squaring the block.
Already have the milodon timing drive all mocked up as well as timing cover.
I'm going with a solid crane with 238 248 dur. .512 .533 lift 112 lisa
I'm swiping the sr401 heads that flow 333 at 700 of my 401
torker intake and my e85 carb
Should end up 11.52 and run e85.
Any input?

Have you considered using the 304/360 crankshaft to stroke it out a little? There's a lot of those around here... and it seems like a good build. A couple of guys running that crank/block combo are pulling some really impressive numbers in the dyno too. Its a unique build and its been done with a high degree of success.

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pipefactory View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pipefactory Quote  Post ReplyReply Direct Link To This Post Posted: Jun/07/2018 at 11:34am
Originally posted by 1982AMCConcord 1982AMCConcord wrote:

Originally posted by pipefactory pipefactory wrote:

I decided my 562 hp 401 in my rambler was too much for the street.
It has a 4 speed with 410 gear now and is fun to drive but would be better with less motor.
I have a low mile standard bore standard crank 343 I'm building.
I have new badger flat tops that will end up .010 in the hole after decking and squaring the block.
Already have the milodon timing drive all mocked up as well as timing cover.
I'm going with a solid crane with 238 248 dur. .512 .533 lift 112 lisa
I'm swiping the sr401 heads that flow 333 at 700 of my 401
torker intake and my e85 carb
Should end up 11.52 and run e85.
Any input?

Have you considered using the 304/360 crankshaft to stroke it out a little? There's a lot of those around here... and it seems like a good build. A couple of guys running that crank/block combo are pulling some really impressive numbers in the dyno too. Its a unique build and its been done with a high degree of success.

I've put flat top 343 pistons in 360's in the past. I've just never built a straight up 343 yet. 
The crank is an Arm-asteel , don't know if that means anything but it is standard and will just need a polishing.
I also have Doug 1 3/4" long tube headers and an E84 carb I built with a 750 Proform body.
It should be fun with a 4 speed, 4.10 gears in my 2900LBS Rambler Classic.


Edited by pipefactory - Jun/07/2018 at 11:41am
Face distorting torque
10.99@121 mph
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Jun/07/2018 at 1:22pm
The ArmaSteel 290/343 crank is nothing really special. ArmaSteel was just the name of the General Motors foundry where it was cast. AMC used that foundry early on but technically... the metal from the later 304/360 crank is actually supposed to be better than the earlier ArmaSteel.

Anyway... Since you are using a 4 speed I guess there is no real point in swapping to a longer stroke and spending extra to modify the later model 304/360 crank flange for an earlier manual trans but the possibility is there because all of AMC crankshaft are swap-able between the various AMC V8 blocks.  

http://www.hotrod.com/articles/can-you-stroke-an-amc-290-v8/

It does sound like you will have a pretty potent set up regardless.. I just thought I mention the 304/360 crank swap because in several cases its helped a few guys make a real screamer out of their 343's.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 343sharpstick Quote  Post ReplyReply Direct Link To This Post Posted: Jun/13/2018 at 10:50am
I'll be watching this one closely. My Javelin Came with a 343 and I used it stock for about 5 years. Very happy with it
My Javelin currently has a slightly modified 401.
At some point the 401 may go into a different car, and original 343 back into the Javelin. If/When I do that I'd like to go through the motor and do something similar to this.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Posted: Jun/13/2018 at 12:27pm
I built a 343 for a customer a couple years ago. 10.3 compression, flat tappet custom ground Bullet cam, ported iron heads with an air gap intake. 455 hp 446 tq


Specializing in engine building and cylinder head porting

https://rbjracing1.wixsite.com/website
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Jun/13/2018 at 12:27pm
Short 3.28 stroke of the 290 - 343 ought to wind up like something fierce...
Gonna drill extra holes in the lifter valley for improved drainback ?
Work the front Main Cap and Timing Cover ? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red Devil Quote  Post ReplyReply Direct Link To This Post Posted: Jun/13/2018 at 12:35pm
Originally posted by PHAT69AMX PHAT69AMX wrote:

Gonna drill extra holes in the lifter valley for improved drainback? Work the front Main Cap and Timing Cover?

Often wondered if drilling holes in the valley and dumping oil onto a spinning cam, crank and rods would make it worse for oil to get back to the sump ... and maybe even toss more oil mist from below up top? Really need a low-pressure to draw oil back to the sump or rely on surface tension and gravity to drain.
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