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In That video the car was idling on a cold start, when it’s warmed up the idle speed is around 800-900 RPM

Ahahah true, it’s pumps out 185-190 Psi pretty sure it’s in the 10:1 range has stock 68 340 pistions

It’s got adjustable rockers

Yep stock magnum heads with 340 manifolds had that combo for years then swapped to headers still using that same part number gasket with headers now. Remflex Inc. 6004 Remflex Exhaust Header Gasket Sets | Summit Racing

I had magnum heads with 340 manifolds I ran remflex gaskets for a magnum engine no sealing issues

Planning on putting some tube headers on it and a double pumper on it, currently has a 73 340 driver side manifold, and dakota passenger And a 1405 600cfm edelbrock, the damn thing runs pretty good under carbed but I know I’m missing some top end though....

That is a for sure, it has the stock 68 340 pistons, I think I was at 185PSI with all plugs out and throttle open when I checked a while ago, I can check again

The car is a 4 speed with 3.55 gears.

Yeah with a timing light, the total I believe was set at 2600-2800 Rpms I have to find the curve specs, had it on a paper they gave me when I got the distributor recurved. I know it has a stock medium spring and a super light mr. Gasket spring. Some combo like this

Oh ahahah my bad I got too excited, 18 initial checked at the balancer, and 10 locked in the distributor with the limiter plate, 28 total no Vacuum advance.

Pics

That’s the best I could get it with out pinging, running on 91 octane.

I know it is a Mopar purple camshaft that’s all the info I have, I had a picture of the part number when I pulled the motor apart to put a new timing chain on it, let me see if I can find it. The engine came out of a challenger, date code is 68 so probably was swapped in some time ago.

That’s the most the motor will take and like I got the mechanical at set at 10 degrees inside the distributor and initial at 18 degrees.

What do you guys think? Bought this 340 used years ago no idea what camshaft is in it!

Thanks AJ ! Right now it currently has a 1405 600 eddy, i have a stock AVS for a 340 laying around, the car has 3.55 gears

Hey guys working on my buddy’s 340 dart he just got, pretty much stock 68 340 compression heads valve train,etc only thing done on the rebuild is they used a size bigger Mopar purple camshaft (as were told) Issue is that I believe the push rods might be too long, why I think this is because...

i would swap the camshaft, the intake, carb and a new double roller timing chain set at the same time. Your adding more fuel and air but your camshaft can’t benefit from the upgrades truly with that stock camshaft. Trust me you’ll want more............

Well they all have roller camshafts, true 9:1 compression, better rings, better heads, don’t leak water out of the exhaust manifold bolt jackets, seal better on intakes, valve covers. The 5.2 camshaft is a better decent RV grind as well

Magnum Horsepower - getting all the power from your Dodge 5.2 or 5.9 engine. |

Your car will be super slow, and you will have your foot down on the pedal getting it to move of the line I wouldn’t run 2.76 unless you were driving highway only.

I wouldn’t start any small block build without a 5.9 magnum core

I’m thinking its two things it’s your timing you need more initial 15 initial and 14-16 mechanical And carb double pumper equals 2 accelerator pumps which drinks gas. Also 67 jets that’s way too small I would think your engine would want 70s I have a 68 340 10.5 compression also similar cam to...

I would sell that motor and and drop in a magnum 5.2 from the junkyard better cam better heads better compression and roller camshaft and put a cheap rpm air gap and summit headers 600 cfm carb. Think of it this way everything you’re going to be doing has already been done to a stock 5.2...

Update so car is running great but when I’m looking at my vacuum gauge at Wot I have 1 inch of vacuum, then once the secondaries open I believe it hits 0 inches. Does this mean I need my secondaries to come in a little quicker?

I dunno that just doesn’t look safe, that motor would have to be chained down because if it shifts up it’s going to push on the steering shaft. Wish there was some better picture cause it looks like it’s resting on the manifold……….

What’s the date code on this? 1572 some the research I seen it’s from 1992?

I’m thinking primary’s will be around 68-70 as well. the carb out of the box had 66 primary and 67 secondaries metering plate and always felt it had a lean surge. (I swapped the plate to run conventional jets in the rear) The 72/74 ran great no surge I don’t see any soot on my bumper or any...

I don’t have a AFR gauge planing on buying one this weekend!

Update, So I jetted down the primaries from 72 to 66 Stock jet size and engine lost some vacuum and I had to raise the idle a hair. Now for sure there is a WOT hesitation only on WOT no where else, it’s a slight hesitation. Why would I lose vacuum from a jet swap? I’ll probably stick the 72s...