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  #1  
Old 02-25-2006, 05:38 PM
73blueduster 73blueduster is offline
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Arrow 340 build up

I am currently restoring a 1973 duster, with a 340 from 1968. It is goin to be a street driver on pump gas and i want the horse power to be 400 or close to that(maybe more). I was wondering if anybody knew a website that has complete ground up 340 engine builds so I can save myself the trouble of figuring out the right engine combinations.

Your feedback is appreciated!!!
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  #2  
Old 02-25-2006, 10:12 PM
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rumblefish360 rumblefish360 is offline
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Do you have any parts for it now. Otherwise, 400 is an easy build.
Rather than give you a parts list, I'll generlize.

From the top down;

Open air cleaner. I really like the K&N set up with extreme lid
750 cfm carb.
RPm intake
For stock heads, port them w/2.02-1.60 valves
Street headers into 2-1/2 inch pipe exhaust with an "X" pipe in there, mufflers your choice but I would recomend Dyno Max ultra flows to handle the chore.
Your comp. ratio should be about 9.5-1. MAX
And the all important cam.
A comp cams Magnum line, 280* duration will get you there no problem.
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  #3  
Old 02-26-2006, 12:07 AM
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pishta pishta is offline
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Rumble, not really an easy build according to how these guys rated their mill, oh yeah, this is gross HP on a stand! Ill go a little farther and give him 16 builds all with dyno numbers and modifications. This is all stock running gear with exception of the cam, ignition (not really an issue until 5500 RPM) intake and headers, no head work. This was done on a bone stock '68 340, already had the 2.02 heads and compression. Has cam design really evolved since this 1969 write-up?

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Old 02-26-2006, 12:22 AM
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rumblefish360 rumblefish360 is offline
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Quote:
Has cam design really evolved since this 1969 write-up?
Oh yea, oh yea, LOL, oh yea. Big changes. ha ha ha ha. Oh yea.
Being that he has a 68, not a 73 340, he needs to port his heads and install better cam. and bigger carb with headers.
But I really do not like to simplify such things to this degree.
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Old 02-26-2006, 05:41 AM
73blueduster 73blueduster is offline
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The engine is .30 over and it has the X heads 2.02/1.60. Thats it for now
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  #6  
Old 02-26-2006, 05:52 AM
Dart 65 Dart 65 is offline
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Does it matter that his 340 has the cast crank versus the forged piece? Is 400 horses possible without breaking it?
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Old 01-17-2012, 09:59 PM
mopar.dude.ps mopar.dude.ps is offline
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I would also recommend a HEI distrubator that I found off ebay for 54.00. It uses an external coil which gives you plenty of firewall clearance. I replaced my MSD ignition system with it. I couldn't be happier. It not only performs well but is easy to hook up. Well worth the money. I also went with the edelbrock performer RPM package. I am hoping to be pushing over 400 after I get the RPM heads and my headers.
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Old 01-17-2012, 10:01 PM
mopar.dude.ps mopar.dude.ps is offline
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My question would be, would stroking it out to a 408 really make much difference? Would I have to use a different intake and heads?
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  #9  
Old 01-20-2012, 07:38 AM
340_GTS 340_GTS is offline
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Quote:
Originally Posted by mopar.dude.ps View Post
My question would be, would stroking it out to a 408 really make much difference? Would I have to use a different intake and heads?
Well, 68 cu. in. is a whole bunch. Probably worth at least 60-80 horsepower over a smilarly built 340 cube motor. Of course it is "worth it", if you want a lot of horsepower!
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  #10  
Old 01-17-2012, 11:04 PM
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cageman cageman is offline
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Dude, that post was from 2006! lol
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