The 'Quickest' A-Body Small Blocks

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Scatpacktom said:
Pa Karp,

A little hard to read that small time slip. Does your 60ft say 2.28?

I'm sure you know, but that is where I would look for my lower ET's. If you could widdle that down to 2.0 or better yet 1.9xx you could probably run a 14.0 or a teen.

1970 Duster vs 1968 GTO - YouTube
Click to expand...

Yes, 4 speed with radials. I literally had to leave at idle. I am learning to drive a 4 speed again, only the 8th pass in the car since 1969.

I also "granny" shifted to. Also, no tuning since I got it running. I think it will run 14:20's.

Curt Rees:burnout:
 
69 Cuda 440 said:
The 'Quickest' A-Body Small Blocks from the Factory {1965 thru 1974}

* Stock Components w/3.91 Gears

Rank......Car...............................Engine/Transmission.....Shipping Weight


#1 .... 1968 Barracuda 'Notchback' ...... 340 4-Speed ............. #3085 lbs.
#2 .... 1968 Barracuda 'Fastback' ........ 340 4-Speed ............. #3162 lbs.
#3 .... 1968 Dart GTS ........................ 340-4-Speed ............. #3177 lbs.
#4 .... 1971 Duster ........................... 340 4-Speed............... #3140 lbs.
#5 .... 1969 Barracuda 'Notchback' ..... 340 4-Speed .............. #3074 lbs.

#6 .... 1970 Duster ........................... 340 4-Speed ............. #3134 lbs.
#7 .... 1971 Demon .......................... 340 4-Speed .............. #3199 lbs.
#8 .... 1971 Dart 'Swinger Special' ...... 340 4-Speed ..............#3214 lbs.
#9 .... 1969 Dart Swinger .................. 340 4-Speed .............. #3172 lbs.
#10 .. 1968 Barracuda 'Notchback' ..... 340 Automatic ............ #3057 lbs.

#11 .. 1969 Barracuda 'Fastback' ........ 340 4-Speed .............. #3144 lbs.
#12 .. 1969 Dart GTS ........................ 340 4-Speed .............. #3197 lbs.
#13 .. 1969 Barracuda 'Notchback' ..... 340 Automatic ............ #3046 lbs.
#14 .. 1970 Dart Swinger .................. 340 4-Speed .............. #3208 lbs.
#15 .. 1971 Duster ........................... 340 Automatic ............ #3117 lbs.

#16 .. 1970 Duster ........................... 340 Automatic ............ #3110 lbs.
#17 .. 1968 Barracuda 'Fastback' ....... 340 Automatic ............ #3129 lbs.
#18 .. 1971 Demon .......................... 340 Automatic ............ #3166 lbs.
#19 .. 1968 Dart GTS ....................... 340 Automatic ............ #3144 lbs.
#20 .. 1969 Barracuda 'Fastback' ....... 340 Automatic ............ #3114 lbs.

#21 .. 1971 Dart 'Swinger Special' ..... 340 Automatic ............ #3185 lbs.
#22 .. 1969 Dart Swinger ................. 340 Automatic ............ #3146 lbs.
#23 .. 1969 Dart GTS ....................... 340 Automatic ........... #3151 lbs.
#24 .. 1970 Dart Swinger ................. 340 Automatic ........... #3179 lbs.
#25 .. 1974 Duster .......................... 360 4-Speed ............. #3300 lbs.

#26 .. 1974 Dart Sport ..................... 360 4-Speed ............. #3330 lbs.
#27 .. 1972 Duster .......................... 340 4-Speed ............. #3190 lbs.
#28 .. 1972 Demon ......................... 340 4-Speed.............. #3241 lbs.
#29 .. 1974 Duster .......................... 360 Automatic .......... #3267 lbs.
#30 .. 1974 Dart Sport ..................... 360 Automatic .......... #3297 lbs.

#31 .. 1973 Duster .......................... 340 4-Speed ............. #3221 lbs.
#32 .. 1973 Dart Sport ..................... 340 4-Speed ............. #3251 lbs.
#33 .. 1972 Duster .......................... 340 Automatic ........... #3165 lbs.
#34 .. 1972 Demon ......................... 340 Automatic ........... #3208 lbs.
#35 .. 1973 Duster .......................... 340 Automatic .......... #3175 lbs.

#36 .. 1973 Dart Sport .................... 340 Automatic ............ #3205 lbs.
#37 .. 1965 Valiant ......................... 273 4-Speed .............. #2750 lbs.
#38 .. 1966 Valiant ......................... 273 4-Speed .............. #2808 lbs.
#39 .. 1967 Valiant ......................... 273 4-Speed .............. #2835 lbs.
#40 .. 1965 Valiant ......................... 273 Automatic ........... #2714 lbs.

#41 .. 1965 Dart GT ....................... 273 4-Speed .............. #2925 lbs.
#42 .. 1965 Barracuda .................... 273 4-Speed .............. #2927 lbs.
#43 .. 1967 Barracuda .................... 273 4-Speed .............. #2940 lbs.
#44 .. 1966 Dart GT ....................... 273 4-Speed .............. #2957 lbs.
#45 .. 1966 Valiant ........................ 273 Automatic ............ #2782 lbs.

#46 .. 1967 Dart GT ....................... 273 4-Speed .............. #3001 lbs.
#47 .. 1967 Valiant ........................ 273 Automatic ........... #2809 lbs.
#48 .. 1969 Valiant ........................ 318 4-Speed .............. #2855 lbs.
#49 .. 1968 Valiant ........................ 318 4-Speed .............. #2866 lbs.
#50... 1965 Dart GT ....................... 273 Automatic ........... #2895 lbs.

#51 .. 1967 Barracuda ................... 273 Automatic ............ #2910 lbs.
#52 .. 1966 Dart GT ...................... 273 Automatic ............ #2928 lbs.
#53 .. 1967 Dart GT ...................... 273 Automatic ............ #2964 lbs.
#54 .. 1970 Dart ........................... 318 4-Speed .............. #2961 lbs.
#55 .. 1969 Dart GT ...................... 318 4-Speed .............. #2998 lbs.

#56 .. 1969 Barracuda 'Fastback' .... 318 4-Speed .............. #3018 lbs.
#57 .. 1968 Dart GT ..................... 318 4-Speed ............... #3019 lbs.
#58 .. 1968 Barracuda 'Fastback' .... 318 4-Speed ............... #3031 lbs.
#59 .. 1967 Dart GT ...................... 273 4-Speed ............... #3001 lbs.
#60 .. 1967 Barracuda 'Notchback' .. 273 Automatic ............ #2855 lbs.

#61 .. 1969 Valiant ....................... 318 Automatic ............ #2824 lbs.
#62 .. 1968 Valiant ....................... 318 Automatic ............ #2835 lbs.
#63 .. 1970 Duster ........................ 318 Automatic ............ #2871 lbs.
#64 .. 1965 Dart GT ...................... 273 Automatic ............ #2895 lbs.
#65 .. 1965 Barracuda ................... 273 Automatic ............ #2896 lbs.

#66 .. 1969 Barracuda 'Notchback' .. 318 Automatic ........... #2899 lbs.
#67 .. 1968 Barracuda 'Notchback' .. 318 Automatic ........... #2910 lbs.
#68 .. 1966 Dart GT ...................... 273 Automatic ........... #2928 lbs.
#69 .. 1966 Barracuda ................... 273 Automatic ........... #2930 lbs.
#70 .. 1967 Barracuda 'Fastback' .... 273 Automatic ........... #2940 lbs.

#71 .. 1970 Dart ........................... 318 Automatic ............ #2942 lbs.
#72 .. 1967 Dart GT ...................... 273 Automatic ............ #2964 lbs.
#73 .. 1969 Barracuda 'Fastback' .... 318 Automatic ............ #2987 lbs.
#74 .. 1968 Barracuda 'Fastback...... 318 Automatic ............ #3005 lbs.
#75 .. 1969 Dart GT ...................... 318 Automatic ............ #3029 lbs.

#76 .. 1968 Dart GT ...................... 318 Automatic ............ #3050 lbs.

Note; Does not include the {1966 Dodge Dart 'D-Dart'}
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EL5 Demon,

I didn't post ET's, just the quickest in order.

What change would you make, Pray Tell.
 
Where did this list originate? Quickest in what road race, 1/8 mile, 1/4 mile, pikes peak?
 
EL5DEMON340 said:
I would put the 71 duster first . On my fantisy list then
Click to expand...

It all depends on the flavor.

1968 'Barracuda 340-S' Notchback ... #3074 lbs. Shipping Weight
* Carter AVS #4933 = {630 CFM's}
* Camshaft = .445"/.455" ~ 276*/284* ~ 52* Overlap
* Compression Ratio= 10.5

vs.

1971 'Duster 340' .......................... #3154 lbs. Shipping Weight
* Carter Thermoquad #4972 = {750 CFM's}
* Camshaft = .430"/.444" ~ 268*/276* ~ 44* Overlap
* Compression Ratio = 10.2
 
"71 Demons and Dusters that run NHRA stock classes. 10:60's"? i remember seeing a mag artical about that car years ago. the guys running it would talk about anything on the car BUT the cam that DID meat NHRA specs. they said the trouble with most cams for small block mopar is that it is a copy of a chevy cam. NHRA stock car has nothing to do with any other stock. dont for get the BO29 cuda is not street legal. but it IS NHRA stock.
 
It's the intake that holds the early cars back, not so much the carb.

The 71 intake has a big open plenum and the runners are at least 1/4 inch larger. If you look at NHRA's engine factors the 71 has always been about 15 hp higher.

Everyday my money is on the 71 340 over a early one
 
69 cuda 440 said:
it all depends on the flavor.

1968 'barracuda 340-s' notchback ... #3074 lbs. Shipping weight
* carter avs #4933 = {630 cfm's}
* camshaft = .445"/.455" ~ 276*/284* {214*/222*} ~ 52* overlap
* compression ratio= 10.5

vs.

1971 'duster 340' .......................... #3154 lbs. Shipping weight
* carter thermoquad #4972 = {750 CFM's}
* camshaft = .430"/.444" ~ 268*/276* {210*/221*} ~ 44* overlap
* compression ratio = 10.2
Click to expand...

nhra {+/-}

1968 ~ 340/275 hp ........... 299 hp
1971 ~ 340/275 hp ........... 314 hp
 
Ha ha nice comeback, but that's what carter rated it at. Scatpack is correct!
71 was the zenith of the 340 4 bbl engines. Second only to the 340 6 pack/bbl engines
 
EL5DEMON340 said:
71 thermoquad is 800cfm and a much better intake .
Click to expand...

Much better Intake,

Be more specific, instead of using a generalization.

What inquiring minds want to know >

__________________________'1971' 340 Intake ____'1968' 340 Intake

* Throttle Bore Sizes
* Plenum Size
* Plenum CC Volume
* Height
* Port Size
* Runner Length
* Heat Crossover Passage Size
 
1968 ~ 340/275 hp ........... 299 hp
1971 ~ 340/275 hp ........... 314 hp

I would say about 15 hp better between the intake and thermoquad using your NHRA hp factor numbers above. And the 68 has a very slightly warmer cam and on paper .2 higher compression ratio. But at any rate I like how my 71 demon runs with the mechanical 6 pack !!
 
To be honest I always thought NHRA factored the 71 at 310hp. But your the match race NHRA guy, I don't want you to jump down my throat on that since I was still in diapers in 71 LOL..
 
Mr Cuda,

If you were to take a head (X or J) that flowed say 240 cfm at .450 lift and you put the avs intake on the head while still on the bench you would see that you may only get a fraction of that 240cfm say maybe 208. The same test with the TQ will simply give you more, say 219.

One is simply better than the other. There is not much to debate
 
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