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Part three:

Would a bone-stock 318 Magnum (with RPM intake, carb not EFI) with headers and good duals make more power than a bone-stock 1970 340, as installed? (read: 100% concours-stock, manifolds, stock duals, points, etc.) I'm thinking it would. Just trying to get some perspective here.

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I just looked around the net ... I don't think it would make more with your apples to oranges comparison of a modified engine to a stock engine, the magnum 318 for all years but one was rated at 230HP , the 340 using the same rating standard made 257HP.

To further , lets put the 1968 340 4 speed version up against the 318 magnum , it had a more aggressive cam.

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Part two: (same question, different flavor)

If i had a nice 340 short block laying around, already built, zero deck pistons, lighter reciprocating assembly, etc. could i just throw everything else from a 360 Magnum onto it and have a 340 Magnum? Heads, RPM intake, hyd roller cam, etc.

Part three:

Would a bone-stock 318 Magnum (with RPM intake, carb not EFI) with headers and good duals make more power than a bone-stock 1970 340, as installed? (read: 100% concours-stock, manifolds, stock duals, points, etc.) I'm thinking it would. Just trying to get some perspective here.

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you could use the factory cam, but you'd need aftermarket roller lifters with the link bars--the block is different from roller to non roller blocks for the lifter retention. factory cam isn't that great, it's very low lift.

note the bosses in the valley and taller lifter bores on the magnum block


compared to a 340 block


part 3, good question, I'd say they'd be about equal. my old '96 ram 2WD/NVG 3500 5 speed/3.21 rear gear had a 318 magnum with an open element air cleaner and a cat back exhaust (which really opened it up over the stock restrictive 2" single exhaust) with 275/60R17 tires (30" tall), and my best was 16.5 in the quarter. it weighed in on the track scales at a little over 4700 lbs with me and 1/2 a tank of gas.

if you can find one, though, I'd be inclined to go with a 5.7 hemi. amazing motor, especially the VVT '09 and up. pushes a 4250 lb charger R/T to 13.7's @ ~104mph

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Part three:

Would a bone-stock 318 Magnum (with RPM intake, carb not EFI) with headers and good duals make more power than a bone-stock 1970 340, as installed? (read: 100% concours-stock, manifolds, stock duals, points, etc.) I'm thinking it would. Just trying to get some perspective here.

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I just looked around the net ... I don't think it would make more with your apples to oranges comparison of a modified engine to a stock engine, the magnum 318 for all years but one was rated at 230HP , the 340 using the same rating standard made 257HP.

To further , lets put the 1968 340 4 speed version up against the 318 magnum , it had a more aggressive cam.

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the 318 mag block is pretty much the same as any '85-uup 318 block, and the 360 mag block the same as any 89-up 360 block, save the magnums didn't have the oil passage from the #2 and #4 cam journal drilled out, since they oil the rockers via the pushrod (some first year magnums had these drilled).

can use a factory roller cam in a non roller block, but you'll have to use aftermarket roller lifters with the link bar, vs. the factory roller lifters. Roller cam blocks have taller lifter bores and 2 threaded bosses in the valley for the lifter retention system (a spring steel "spider" than holds down steel "dogbones" with keyed holes that go around lifter pairs to keep them from rotating).

92 magnum 318's were rated at 230HP net, 94-97 220HP, 98-2001 230HP. the 10HP difference was the first years IIRC had exhaust manifolds with larger exits, and the 98-up had improved exhaust systems from the manifold back

the 93-97 360's were rated at either 230 or 235 HP (save the '96-97 ram SS/T was rated at 245 or 250 IIRC) with the power differences being exhaust changes after the motor

340's in '72-73 were factory rated at 240 HP net, IIRC.

get a 318 magnum, get the roller cam reground to slightly more aggresive (bullet cams HR259/316 lobe for both intake and exhaust), & run headers and an RPM air gap, and you'll have an honest 300HP or so...that' essentially the combo I had in my 5th ave with an A500 and 3.55's, and it'd knock down 17.5mpg in mixed driving and keep up with 1st gen AWD hemi's (so, mid 14's)....not bad for a 3950lb car. put it in a 3200-3300lb A or E body, and it should be into the 13's...the powerband was wide enough that I think it would work real well with an A833OD tranny and either 3.23 or 3.55 gears.

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here is my current combo

72 B (RR)
360 mag longblock
.020 kb 356
bullet regrind (259/267 HR)hughes springs/retainer
rpm intake 600 holley DP
factory 72 B/E ehaust mainfolds dual 2 1/4 exhaust
85 truck A833OD
8 3/4 3.23 gear
225/70/14 bfg's

with timing at 12 int. 30' 2200 vac advance +25
current stock out of the box jetting

in town mpg's 15 highway mpg's low 20's

mike

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Magnum heads are good. aside from differences in the lifter valley for the roller cams, and the heads themselves, there's not much different.

no experience with a 340, but my 4000 lb Dakota with a 318 magnum with a cam, intake, and exhaust, NV3500, and 3.92 gears on 28" tires, ran the 1/4 mile in 14.7 @ 97 mph the cam specs were 220/230 with a 114 LSA, and it would pull hard through 6,000 rpm.

in a much smaller, lighter car, I bet it would have done low 14s, if not break into the 13s.

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Magnum heads are good. aside from differences in the lifter valley for the roller cams, and the heads themselves, there's not much different.

no experience with a 340, but my 4000 lb Dakota with a 318 magnum with a cam, intake, and exhaust, NV3500, and 3.92 gears on 28" tires, ran the 1/4 mile in 14.7 @ 97 mph the cam specs were 220/230 with a 114 LSA, and it would pull hard through 6,000 rpm.

in a much smaller, lighter car, I bet it would have done low 14s, if not break into the 13s.

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I dont know much about the stock roller cams, is that a small cam? mild? mid-range? What kind ov intake and exhaust? Thats not moving bad for a 2-ton brick...

Sounds to me like a slightly warmed-over (bolt-ons) 318 Magnum would move my 3000-3100lb car pretty good. Basically, if its as fast as my bone stock 3500lb A66 Challenger was with just exhaust, intake and deleting accessories i'll be happy. Because i could have just tuned that A66 car to go MUCH faster knowing what i know now...

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SECOND QUESTION:

All things equal, what will make more power? leaving the EFI and beer-barrel intake on the 318, or an RPM (or even an Air-Gap RPM) intake and a well-tuned Holley?

Basically, would i be losing power going to the RPM and carb over the EFI? or gaining power?

I dont really want to get into the old EFI vs carb HP debate, its more ov an intake question. Thats where the real difference will lie.

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Magnum heads are good. aside from differences in the lifter valley for the roller cams, and the heads themselves, there's not much different.

no experience with a 340, but my 4000 lb Dakota with a 318 magnum with a cam, intake, and exhaust, NV3500, and 3.92 gears on 28" tires, ran the 1/4 mile in 14.7 @ 97 mph the cam specs were 220/230 with a 114 LSA, and it would pull hard through 6,000 rpm.

in a much smaller, lighter car, I bet it would have done low 14s, if not break into the 13s.

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I dont know much about the stock roller cams, is that a small cam? mild? mid-range? What kind ov intake and exhaust? Thats not moving bad for a 2-ton brick...

Sounds to me like a slightly warmed-over (bolt-ons) 318 Magnum would move my 3000-3100lb car pretty good. Basically, if its as fast as my bone stock 3500lb A66 Challenger was with just exhaust, intake and deleting accessories i'll be happy. Because i could have just tuned that A66 car to go MUCH faster knowing what i know now...

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IIRC the stock 360 magnum roller cam is approx -250adv/~190@.050 and .41" valve lift. the 318 magnum roller cam is ~240adv/~180@.050 and .430" valve lift.

either can be reground by bulletcams.com for a reasonable amount. use the HR259/316 lobe for intake and exhaust, and hughes #1110 springs (looking at ~$250 total for cam regrind and springs) which will get you in the 320-340 honest HP with headers and an RPM intake....

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yea, but the beer barrel is only good in a stock truck that you use for towing. period.

beer barrel vs RPM and a carb? well, put it this way, a stock 360 in a truck made 250 hp. 345 ft lbs of torque. with just a swap to a carb intake like the RPM, and bolting on a set of headers, suddenly you have a 300 hp/375 ft lb crate motor.

my 318 was a stock 318 with a cam that had 220°/230° @ .050 just over .500" lift, on a 114 LSA. Intake was a 2bbl single plane, M1 EFI intake, and headers were edelbrock mid-length dakota headers with crappy bends, and smashed tubes to form the merges.

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That 318 had enough torque to smoke the tires through first gear and into 2nd if you power shifted it, which really puts a damper on the argument that you need the beer barrel intake to make torque, or that your low RPM torque suffers when you ditch it. The 318 was knocking down 17 MPG overall too! (IN A 4,000 LB BRICK OF A TRUCK!)

my truck has a 360 now, same stock magnum heads, and a Hughes whiplash cam, 222/228° @ .050 .544 lift and 107LSA, and it's got even MORE torque off idle, and dyno'd at 285hp/325 tq at the rear wheels. The tighter LSA on this cam though is hurting my MPGs I feel. my MPGs are now about 14-15 overall.

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