12's from a 340 naturally aspirated.

-
That's a pretty low rpm to finish up at. Smaller tire and not so crazy at the launch.
Work that suspension! If your spinning out of the hole, your putting to much into it and need to back off the throttle &/or get a better gripping tire (possible width issue) &/or get the chassis to work for you.

Enjoy, have fun!
 
VonCramp said:
I know, but Mopar guys are a rarity down in Texas.
Click to expand...

They are around here, too. Most of them are buttholes.......cept for the few FABO members I've met. All of them are cool. I've had Chevy guys drool over my 75 F250......and of course the Ford guys love it. But the Mopar guys turn their noses up. I love all the older American stuff.
 
I have a .030 340 built in 1981 with stock cast iron x heads. Stock intake manifold. MP. 509 292 hydraulic flat tappet cam. Car is a bracket car. 4.30 rear gear 31 inch tall 13 inch wide tires with a unknown stall converter I estimate around 3000. Ithe has run mid 12s for 30+ years with a best et of 11.82. My current trap speed is 106 to 107
 
I've met some really odd ball-werd mopar people. To the point I won't answer calls or at the very least roll my eyes knowing the conversation is going to be a major up hill battle.
RustyRatRod said:
They are around here, too. Most of them are buttholes.......cept for the few FABO members I've met. All of them are cool. I've had Chevy guys drool over my 75 F250......and of course the Ford guys love it. But the Mopar guys turn their noses up. I love all the older American stuff.
Click to expand...
 
Last edited:
This thread sure took a turn! After reading everyone's responses it would appear the 340 is one of the fastest small blocks ever offered. Yet, most people talk like it is just a motor for the resto-guys.
 
VonCramp said:
This thread sure took a turn! After reading everyone's responses it would appear the 340 is one of the fastest small blocks ever offered. Yet, most people talk like it is just a motor for the resto-guys.
Click to expand...
well, it was one of the fastest offered from Mopar....
 
VonCramp said:
This thread sure took a turn! After reading everyone's responses it would appear the 340 is one of the fastest small blocks ever offered. Yet, most people talk like it is just a motor for the resto-guys.
Click to expand...

it is to me....i race 360s...but that will start another argument...
 
VonCramp said:
This thread sure took a turn! After reading everyone's responses it would appear the 340 is one of the fastest small blocks ever offered. Yet, most people talk like it is just a motor for the resto-guys.
Click to expand...

I disagree that it was one of the fastest motors ever. That's just not true.

Now, the 340 in an A body.......THAT was one of the fastest cars ever. That's how the 340 got its rep. In the A body.

I can name plenty of other faster, more powerful engines. The 430 Buick, 390 AMC, BOSS 351C, 425 Oldsmobile, 500 Cadillac. It's not the engine itself that garners the reputation. It's what it was IN that makes the legend.

I do agree though that the 340 was certainly a legendary small block........just like the original 370 HP 350 LT1, the 271 HP solid lifter 289, 365 HP 327, 375 HP 327.......I can go on and on.

The fact is, there were lots of legendary engines back then. Mopar lucked SLAM UP with the 340 A body package. THAT is what was legendary, the whole package.
 
I agree with RRR. The old basic plan worked and still works today. Strong engine in a light car equals Go-Fast!
 
VonCramp said:
This thread sure took a turn! After reading everyone's responses it would appear the 340 is one of the fastest small blocks ever offered. Yet, most people talk like it is just a motor for the resto-guys.
Click to expand...
The 340 is the most powerful small block motor produced by Chrysler in stock form up until the Magnum motors came out in 92. I don't know the horsepower at the crank of the Magnum 5.9. 340 id definitely most powerful carbureted small block from Chrysler in stock form. In stock form 340s were always performance motors. 360s were rarely performance motors.

The reason 340s are for the restoration crowd is because they are somewhat rare
and therfore expensive. When building non stock motors it is the same price or cheaper to build a 360. If you have a 340 already I would build it. If you are looking for your next hot rod motor to build it may be less expensive to buy and build the 360.
 
I agree that IF you do not allready have a 340, build a 360. It will be cheaper.

I agree that IF you allready have a 340 that it would better to build that instead of getting a 360. I do like the extra stroke better though. Just a personal thing.
 
Getting ,back to basics...No chance,Von Cramp has a drag strip video? That GOES a long way,for us FABO keyboard racers here.....
 
VonCramp said:
Looking for members who have obtained 12's from their stock stroke naturally aspirated 340's. I have a standard bore '72 340 that got me in the 13's at 104 mph with a flat cam. I have since upgraded to a solid roller .600 lift Comp Cams and cometic head gaskets. The pro comp heads chamber didn't like the .027 piston out of the deck hitting them. Lesson learned. I am running 3:91 gears on a 29" tire with a 18-spline a body 4-speed. Can it be done? I sure hope so.
Click to expand...

What is the part number you used on the cometic head gaskets?
 
1972 340 steel crank, stock resized rods, .030 over, cast heads with some pocket porting only, 10:1 compression, .590 mopar cam, M-1 intake, 750 vac. Carb, 727 trans with 8" 4400 stall, 8 3/4 with 4.56's 29" tall tire. Best et 11.6's @ 115 on pump gas 93 in a 1967 barracuda the 60ft's where 1.6's
 
Back in 1985, my '71 Cuda, all steel, road car minus back seat, lightweight front seats, 3550 at least with me. Original 340 car, 727.
Stock 10.5:1 with .039 fel-pro's, stock 2.02/1.60 heads, no porting, DC.590 SFT cam, Holley SD intake, 850DP, 1.75" hedman race chassis hdrs, stock worn fr shocks, stock leaf springs clamped, pinion snubber, shock extensions, TA 4200 verter, 8.75 w/posi, 4.30's, 10x28 goodyears, consistent 12.4's with a best of 12.38@108....1.69 60ft

0cuda_launch_663.jpg
 
Last edited:
Some years ago I set up a 340 that had been bored +.030, otherwise stock bottom end. Ported J heads, MP intake, hydraulic Comp cam, headers, 4.30s, 8" convertor. Best was 12.08 @ 109. Car was all steel except hood. The whole situation is/was not one I'm happy with, but it takes good work, good parts, and some know-how and it's not hard to do.
 
I have to say that I don't think the issue is with motor. 2.40's 60' is the issue. I have seen very few people who can consistently launch a stick car. You cut a tenth off your 60' it's two tenths at the top. I average 1.80 60' on a f70 14 redline bias ply. 6" wide. Other than both being small blocks our combos don't compare, but my point is 2.00 60's are not out of the realm of possibilty for your combo. How's your et after shaving 8 tenths? Until you can 60' you stick car at your horsepower level you going to go in circles. With a stick you have to drive it like you STOLE it!!!
 
With a stick, ether walk it out or dump and hook. If your car doesn't hook, then walk it out. Once out, hammer it as quick as it will ingest.

Getting a stick car to hook can be difficult due to the extreme shock at clutch dump. This is also why it is easy to break parts on a stick car.
 
I am running 3:91 gears on a 29" tire with a 18-spline a body 4-speed.

Thats your problem!
29" tall 3.91.
Most people running that tall, of a tire, are running 4.56 or more gear.
Try a 26" tire or 4.56 gear. That will bring your 60" down.

Can't help you with a stick, never raced with one. That first gear, you must have to slide the clutch for forever, or bog it when you leave the line.
2.40 60' is were you have plenty room for improvement.
You should be geared so that you turn on your shift light at the finish line. you need gearing. shorter tires and more gearing.
I'm not sure what you shift at, but trapping at 4900 rpm, leave a lot on the table
 
j par said:
I can think of only one naturally aspirated 340 4 speed car on this forum that doesn't do 12 seconds - yellow rose! LOL :poke:
Click to expand...


Damn...snuck one in on me when i wasnt looking.

I need to pay attention. You butt tards are going after me when im trying to be good.
 
Well we all get lucky sometimes! I don't think I've seen you on the forum in a little while?
yellow rose said:
Damn...snuck one in on me when i wasnt looking.

I need to pay attention. You butt tards are going after me when im trying to be good.
Click to expand...
 
In my defense I said that 2 months ago or more. I haven't thrown any smart cracks out there since I hadn't seen you on the Forum so.....
j par said:
Well we all get lucky sometimes! I don't think I've seen you on the forum in a little while?
Click to expand...
 
You must log in or register to reply here.
-

Back
Top