Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: ScottSmith_Harms]
#2041573
03/29/16 11:56 PM
03/29/16 11:56 PM
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Joined: Jan 2003
Posts: 8,018 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,018
Tulsa OK
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I would go with the KB243 piston and work hard on getting the quench good. It will be right around 10:1 if I remember and with the quench it will likely not have any problems with pump fuel. I can't help much with the manifolds and carb but getting as much compression as you can on pump fuel doesn't hurt.
I had a stock stroke 340 in my car in high school and modified more as time went on. It had the KB243s with good quench and ran on 93 octane for years with no trouble. Once I had the X heads ported and used a good converter it went 11.98@114 in good air. I want to build that motor again for something else someday, it was fun.
68 Barracuda Formula S 340
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: coletrickle]
#2047040
04/05/16 12:57 PM
04/05/16 12:57 PM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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Extrude Hone the buggery out of those exhaust manifolds? What about stock Eliminator I've got a recipe for all the tricks for a Bob Lambek h/s build I could dig the book out if you want.I think I know where it is it was only 1992😆 Extrude hone maybe 3-4hp for $500 bucks. Not worth it imo. Stock brackets recipe call for stock lift cams running 350* duration & 7000rpm. Not exactly street friendly.
Last edited by DARTH V8R; 04/08/16 02:29 PM.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: ScottSmith_Harms]
#2047111
04/05/16 02:17 PM
04/05/16 02:17 PM
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Joined: Jan 2003
Posts: 14,492 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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You can only wake up a stock motor so much if most of it is going to remain stock. Push the cr as high as you dare, little bit of a cam(solid lifters would be worth a little something), mild bowl port on the heads, 2.02 valves. Not really much else that will fit the rest of the criteria.
For sure, the absolute best way to really enhance the fun factor for that type of project is a stroker. Anything else will be way way less effective.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: GY3]
#2047250
04/05/16 05:26 PM
04/05/16 05:26 PM
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Joined: Nov 2003
Posts: 3,060 Western New York
sixpackbee
master
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master
Joined: Nov 2003
Posts: 3,060
Western New York
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What gear? Any type of converter? Low gear trans an option?
1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: fast68plymouth]
#2047374
04/05/16 08:49 PM
04/05/16 08:49 PM
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Joined: May 2003
Posts: 1,751 Graham, WA
Polarapete
top fuel
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top fuel
Joined: May 2003
Posts: 1,751
Graham, WA
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You can only wake up a stock motor so much if most of it is going to remain stock. Push the cr as high as you dare, little bit of a cam(solid lifters would be worth a little something), mild bowl port on the heads, 2.02 valves. Not really much else that will fit the rest of the criteria.
For sure, the absolute best way to really enhance the fun factor for that type of project is a stroker. Anything else will be way way less effective. That is the answer. Take the 340 out and store it for someone that has to have a 340 and is willing to pay stupid money for it. If you want the 340 look, get a 318 core, bore it .030 and fit it with a cast 4" crank and at least 9 to 1 pistons. A mild cam and 4 barrel will run well on today's gas. JMHO
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: ScottSmith_Harms]
#2049209
04/07/16 09:12 PM
04/07/16 09:12 PM
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Joined: Jan 2003
Posts: 751 Saint Peters, MO
Brian
super stock
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super stock
Joined: Jan 2003
Posts: 751
Saint Peters, MO
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Scott,
Since the pistons have been discussed, Lets talk camshaft, converter and gear.
How about the good old XE268 18-20 degrees initial timing, 36 total at about 1800RPM and another 15 degrees in the can for cruising
A "tight" 10" converter with at least a 3.73 gear since I'm sure he'll be running something like a 255/60-15 in the back.
Shift @ 6000Rpm
Last edited by Brian; 04/07/16 09:12 PM.
1971 6.1 Gen III Hemi Duster
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: ScottSmith_Harms]
#2049549
04/08/16 10:47 AM
04/08/16 10:47 AM
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Joined: Feb 2009
Posts: 1,274 Ontario.Canada
can.al
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,274
Ontario.Canada
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How about some cam numbers. Remember, pump gas, heavy car, street driven 268 XE would be very lazy in a big car like that until about 40 or 50 mph. how about the generic 204 / 214, .429 / .444....good lo end torque. that should break the tires loose and pull good beyond the speed limits
Last edited by can.al; 04/08/16 10:48 AM.
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: can.al]
#2049561
04/08/16 11:09 AM
04/08/16 11:09 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I never ran a 340 in a B-body but when I was running stock stroke 340s in A-bodies on the street I always started at the back of the car.. I started with a gear in back then conv then worked on the engine... in 340s the valve springs were always the weak link.. I would change them even if it was the stock cam so it could rev a bit more
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Re: 340 Stock Stroke Street Build Recipie For a 73 B-body
[Re: ademon]
#2049580
04/08/16 11:41 AM
04/08/16 11:41 AM
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Joined: Mar 2005
Posts: 792 Earth
Rob C
super stock
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super stock
Joined: Mar 2005
Posts: 792
Earth
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Why is a stroker not a option? Thats not going to be a very fast car with exhaust manifolds. even if he spends a ton on ported intake and max 915 heads with 2.05's valves, if CR is pump gas friendly its probably a 350hp motor but in that body a 14 second car in street trim Why ask why ? Just work the issue. You can argue all you want for a stroker. But it is simply just NOT on the option list.
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