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343 with 400 hp

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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: 343 with 400 hp
    Posted: Apr/28/2017 at 5:59am
High guys, my V16 AMC is ready for the Dyno so now time to plan my CJ5 engine.
I have a nice 1967 343 I want to build for it.
What does it take to make 400hp at the crank. Im ok with 10 to 1
I have a torker that was slotted for early and late years I plug welded and redrilled for later and welded up all heat crossover and choke stuff, an erson cam 108 lsa 480 lift 238 @.050, Edelbrock shorty headers that exit 3" that I had on my Rambler running 11.36 and I plan to use late 80's heads

Edited by pipefactory - Apr/28/2017 at 6:03am
Face distorting torque
10.99@121 mph
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Boris Badanov View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Apr/28/2017 at 11:45am
Honestly start with a 360.

But I have owned 343s and loved em.

11:1 compression, a quench of .03 (.1+ is typical of the 343s I have disassembled)

ad a nice 300 deg advertised duration cam and 400 hp
should be easy peasy.

Block those intake heat cross over ports for best results.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Apr/28/2017 at 12:09pm
my 343 is 10.2 to 1 and is making 472 hp with 465 ft lbs of torque..  i would have to look up all the specs again as i dont remember anymore
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Apr/28/2017 at 5:19pm
I've seen several 343's making over 400hp... so that is achievable. 

A lot of 343 engines have used the 360 crank for making a lot of power! That'd be a real sleeper modification!

Also... a 360 can be had complete for $150 on Craigslist! So... there are a lot of possibilities that will make the power you want...

 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Apr/28/2017 at 6:55pm
First step is to work out what trans you want to run behind it. If it's a TH400 or TF727, then use a later 360 crank in the build, it will give you a few extra cubes and save modifying the crank to take the later transmissions.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pipefactory Quote  Post ReplyReply Direct Link To This Post Posted: Apr/29/2017 at 6:37am
I'm going to use the T15 thatis in the Jeep. Not going racing just want to make something cool. This is what the Jeep has now.

Face distorting torque
10.99@121 mph
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMC RICK 401 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/29/2017 at 10:55am
If your in need of a 343 Flywheel I have one ready to go.
1969 SC Rambler
1974 Jeep CJ5 Dirt/Sand Drag Racer w/401 TH400
Tube Chassis Dirt/Sand Drag Racer w/401 Powerglide
"We are not here for a long time but we are here for a good time"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote T.J. Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2017 at 9:31am
I don't post here very much, but I thought I'd share that you might want to rethink putting that much HP in front of a T15. They were designed to handle the output of a stock 304, and not much more. I scattered mine within weeks of building up the 304 I used to have in my CJ. I adapted a Ford T18 to take its place using a Novak adapter. The T18 is Rhino strong, and should hold the 400 ponies well. Sounds like a great project!
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