360 Magnum vs 340 mild street build - my experience

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318willrun said:
I understand, and I was throwing out the cost as well. I was just saying once we start putting strokers and 2.08's on the 340 or 360, then we lose the mild backyard rodder... might as well say Trick Flow heads ... on a 440? If
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Possible... Everyone has different ambition levels however I add those things and I would consider myself a back yard mechanic with most of my tools from harbor freight no special degree here ... Die grinder from harbor freight used a few 318 heads to learn porting
 
Andrew vanman87 said:
Possible... Everyone has different ambition levels however I add those things and I would consider myself a back yard mechanic with most of my tools from harbor freight no special degree here ... Die grinder from harbor freight used a few 318 heads to learn porting
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not challenging you, just conversating but do you install 2.08 valves in heads with your harbor freight die grinder ??? You bore the block .030 with what in your back yard for the stroker kit pistons?
 
RandyB said:
I’ve got the spacer. And I think I’ve read that yes, I’ll have to get a different sized Torque converter. He’s trying to talk me into putting in a manual transmission and bigger rear end since we will be taking it apart anyways lol which I’m leaning towards that
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You will not believe how much a "3500 loose" 10.5 converter will wake your car up. Do that first and You may not want to touch anything else. When ever we install a high stall converter in a customers car. The response is "Wow!" or "holy ****!" or "I Can't believe the difference!"
 
318willrun said:
What did the '70 Duster "all original" run in the 1/4 ? ever try it ? I know people that bought them brand new and tried to get into the 13's with 3.91's and couldn't with the only thing changed from show room was slicks.
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Never took the Duster but this blue Swinger went high 13's with hubcaps and sticky Coronell's 340 4spd. Slicks slow them up with factory gears sets. Sometimes spinning a little was better. A dead hook would kill them.

I can remember my son's first pass on the track with the brown and white Duster. He was still sideways at the 1/8 mile. We were laughing our asses off. The blue 72 Duster 340 4spd 355's was a pig.

Back in the 80's Todd and I would buy them and the ones that run we would just hammer the living crap out of them. We're still doing it but its costing a lot more.

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Oldmanmopar said:
Never took the Duster but this blue Swinger went high 13's with hubcaps and sticky Coronell's 340 4spd. Slicks slow them up with factory gears sets. Sometimes spinning a little was better. A dead hook would kill them.

I can remember my son's first pass on the track with the brown and white Duster. He was still sideways at the 1/8 mile. We were laughing our asses off. The blue 72 Duster 340 4spd 355's was a pig.

Back in the 80's Todd and I would buy them and the ones that run we would just hammer the living crap out of them. We're still doing it but its costing a lot more.

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nice photos of some A-bodies. I really like that blue/white striped '72 Duster
 
replicaracer43 said:
I've said this so many times and been criticized for it, but your correct in every aspect
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Criticized by old time Mopar chest thumpers that have no basis for their opinion. Hands down cubic inches will win with everything else being similar. Now, here comes the attacks. lol
 
It is not only cubic inches that win here.....
Going back to the OPs idea of 'cam kit & header upgrade', that suggest a good all round performance engine, not a race engine, & that is what my comments below are based on.
The 360 has a lower rod/stroke ratio than the 340. That is a big plus for a street engine. The 360 can use a cam with more overlap/duration than the 340/360 proportion dictates, while having the same idle characteristics as the 340 because the shorter r/s ratio tolerates overlap better.
So the 360 gets a boost from more cubes, but exponentially more tq as rpm increases because of the cam duration increase. All else being equal.
 
replicaracer43 said:
I've said this so many times and been criticized for it, but your correct in every aspect
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RustyRatRod said:
Criticized by old time Mopar chest thumpers that have no basis for their opinion. Hands down cubic inches will win with everything else being similar. Now, here comes the attacks. lol
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Sometimes you just can install wisdom and pound the legend out of there heads at the same time. It doesn’t matter how mathematically correct you are, it doesn’t matter what your experience is.
 
Andrew vanman87 said:
... Valve shrouding in smaller diameter bores especially when adding 2.08 valves or larger on a cylinder head how much does valve shrouding come into play with a 2.08 or larger valves ....
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Have you seen small block heads with 2.08 valves? The valves are almost touching. That is race car stuff, definitely not needed for us mere mortals.
 
I was wondering where all the "no replacement for displacement" guys were that always make that comment in 318 threads.

Funny how they never show up in 360 vs 340 or 400 vs 383 threads.


EDIT- I see RRR touched on it.

Good for you.
 
YY1 said:
I was wondering where all the "no replacement for displacement" guys were that always make that comment in 318 threads.

Funny how they never show up in 360 vs 340 or 400 vs 383 threads.


EDIT- I see RRR touched on it.

Good for you.
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Excellent point. Crickets. lol
 
Yeah, the displacement seems to prevail. Back in the day I did a series of street races in my 64 Polara 500 with a 361 big block against a fellow club member in his factory 360 Duster. I had done the “cam kit and headers” (484 Purple shaft cam, Sig Ergson anti-pump up lifters, and Headman headers), ACCEL dual point distributor, and an aluminum DP4B intake with a 1969 AVS. I had a 4 speed tranny with a street/strip heavy duty disc and pressure plate. He had the factory 3-speed setup. We both had freeway gears (I hadn’t saved enough money to change the rear yet).
From a standing start he would beat me off the line every time and win. From a 20 mile an hour roll I would barely win. That 1 horsepower advantage that I had would show itself once I got my sled moving. Or was it the big bore short stroke 361 advantage over the small bore long stroke 360?
I never raced a Magnum 360 since I had liquidated my empire (marriage and kids) by the time the 360 Magnums came out.
 
RustyRatRod said:
Criticized by old time Mopar chest thumpers that have no basis for their opinion. Hands down cubic inches will win with everything else being similar. Now, here comes the attacks. lol
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The most powerful cars I ever owned were my GTX's and Coronet R/T's 4spd trac-pack cars. The 69 440 six packs were the ultimate off the show room floor. The most fun to pull gears with were the 65-66 GTO's and the 67-69 firebirds. Those close ratio munci transmissions were like shifting a dirt bike. The engines and 10 bolt rears just couldn't take the abuse like a mopars.
 
66fs said:
I'd love to stay and chat, but I'm building a 2.02 J Head, 72 piston 340 for one of my cars. No 360's here...
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Some years back, I also built a '72 340 2.02 J head, used MP .474/280 cam. It ran strong. LD 340 intake, 750 DP, and I believe cyclone headers....
 
318willrun said:
Some years back, I also built a '72 340 2.02 J head, used MP .474/280 cam. It ran strong. LD 340 intake, 750 DP, and I believe cyclone headers....
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The plan is custom Racer Brown MFT cam, 71 340 intake with a 72 340 manual TQ, 68 -70 340 exhaust manifolds, in front of an 833 O/D and 3.91 gears. We'll see how it evolves. I will take pictures...
 
383 or 440:poke:
400 stroker
get outta here with them little blocks. lol
:poke:
My derail stops here at post 41.:thankyou:
 
318willrun said:
Some years back, I also built a '72 340 2.02 J head, used MP .474/280 cam. It ran strong. LD 340 intake, 750 DP, and I believe cyclone headers....
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What rpm band did it perform in?
 
318willrun said:
I put that same cam in a 360 and it loved it right from idle.
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The only converter I have is a 2500. Might be a bit to large of a cam? I think so but don’t know so.

Oh, behind a 5.9, 727, 3.55’s.
 
rumblefish360 said:
The only converter I have is a 2500. Might be a bit to large of a cam? I think so but don’t know so.

Oh, behind a 5.9, 727, 3.55’s.
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I would think the 470/280 would work well in your combo.
 
rumblefish360 said:
The only converter I have is a 2500. Might be a bit to large of a cam? I think so but don’t know so.

Oh, behind a 5.9, 727, 3.55’s.
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I started with that cam behind a stock converter and 2.76's in the 340. Eventually 3.91's and 10" converter
 
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