340 shift points
#1771883
03/05/15 02:06 AM
03/05/15 02:06 AM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Have a 340, 750 Holley DP carb, performer manifold. 1 5/8 headers, unknown compression and I believe a stock bottom end, has a hyd cam in it but unknown
So I am going to take it to the track and see what it has. I have had it up to 5500 at shifting.
What would be a safe RPM not to exceed?
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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Re: 340 shift points
[Re: Stroker Scamp]
#1771884
03/05/15 02:11 AM
03/05/15 02:11 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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Quote:
Have a 340, 750 Holley DP carb, performer manifold. 1 5/8 headers, unknown compression and I believe a stock bottom end, has a hyd cam in it but unknown
So I am going to take it to the track and see what it has. I have had it up to 5500 at shifting.
What would be a safe RPM not to exceed?
Thats a unknown.. but I would think 6000 is easy IF
you have any kind of decent valve springs... I use to
go higher than 6000 on a stock engine... valve springs
were the weak point
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Re: 340 shift points
[Re: ademon]
#1771887
03/05/15 10:10 AM
03/05/15 10:10 AM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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Put you big boy pants on. Turn it til it pukes. Fix it and drop a hundred off the rpm. LOL
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: 340 shift points
[Re: Leon441]
#1771888
03/05/15 11:31 AM
03/05/15 11:31 AM
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Joined: Dec 2009
Posts: 20,698
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,698
in a cattle trailer down by th...
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Quote:
Put you big boy pants on. Turn it til it pukes. Fix it and drop a hundred off the rpm. LOL
I used to twist my 340 to 8500 but it was far from stock. 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 340 shift points
[Re: Stroker Scamp]
#1771890
03/05/15 06:11 PM
03/05/15 06:11 PM
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Joined: Jan 2003
Posts: 26,032
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,032
Rio Linda, CA
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I've always thought the pushrod angle is the limiting factor in the LA engine rev limit.
The INTERNET, the MISinformation superhighway
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Re: 340 shift points
[Re: John_Kunkel]
#1771891
03/05/15 09:24 PM
03/05/15 09:24 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Mike my old 340 was stock bottom end, Eddy heads, 230/230 480/480 hyd cam, air gap, 750.
5600 was the sweet spot, it didn't go any faster spinning it higher.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: 340 shift points
[Re: Stroker Scamp]
#1771893
03/06/15 07:58 AM
03/06/15 07:58 AM
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Joined: Feb 2006
Posts: 608
TN
1DGEMAN
mopar
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mopar
Joined: Feb 2006
Posts: 608
TN
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Back in the old days of Stock Elim when you had to run stock springs and stamped rockers and real factory cam. I shifted at 6800 in both hc and lc 340's at 7200 it would punch rockers. I had first hc and lc 340's to hold NHRA national records in the 11's. Many years later had 1st lc 340 record holder in the 10's shifted that at 7800. 340's like rpm. Modern cams should work a lot better than the old stock cam. I would start at 6500 and go up from there. Let your ET slip be your guide.
Real Men shift for themselves
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Re: 340 shift points
[Re: Cab_Burge]
#1771895
03/10/15 11:23 PM
03/10/15 11:23 PM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Well didn't get to drive the car, the Wife did and it was her first time down the track. I told her just put it in drive and punch it. So with hard as rock Toyo's spinning in first and the car shifting on its own ran a 13.85 @ 96 mph Nothing broke and we drove it back home and I think she is hooked. 
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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Re: 340 shift points
[Re: Leon441]
#1771896
03/10/15 11:39 PM
03/10/15 11:39 PM
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Joined: Oct 2007
Posts: 1,973
SoCal
jake4cars
top fuel
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top fuel
Joined: Oct 2007
Posts: 1,973
SoCal
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Quote:
Put you big boy pants on. Turn it til it pukes. Fix it and drop a hundred off the rpm. LOL
ding, ding, we have a winner!! my 4-speed 340 went to where no engine should go and seemed to love it! LOL
Joey
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Once your in the ball park, 5500 RPM is slower than 6000 and 6500 is slower also then try 5700 and 6300 RPM 
Bad weather, high DA days shift it lower and good low DA days shift it higher, say 200 to 300 RPM different either way 
