Search results for query: 340 manifolds

Two problems. 1. Not sure you can determine the port size form the gasket alone. 2. The port you care about for performance, is the outlet. The 340 and "good" magnum manifolds have the larges outlet. Sounds like you've already talked yourself into using 318 manifolds, so carry on and enjoy.

For Sale:1972 Scamp-clean title in my name. Clean and solid original Oregon car freshly rebuilt for cruising with a street machine attitude and a 70's vibe. All mechanically redone and sorted out. This is a turnkey, and go car, made to drive anywhere on fair weather days. Paint is 20 yrs old...

For sale nice used set of 68 through 70 340 HP exhaust manifolds.....this set also minimal pitting .....but has had heat riser removed and bolts put in holes ....no visible damages ..... thanks fabo .....located ny state 12306.....$700 plus shipping in USA

Put in anything you want. Manifolds will just hold you back after you get past a 340 spec cam.

Rebuilt and Ready to Run. Date code L9 4933S. This was off my 1970 Dart Swinger 340 4 Speed. Complete ready to bolt on. Even includes Idle solenoid. Asking $600 plus shipping. Will be packaged up in bubble wrap. If interested I even have the complete fuel line assembly from the outlet of the...

About 1978, put a set of cheap BlackJack headers on my otherwise stock 73 Duster 340. They leaked, rattled and hung low, but the car ran almost 3/4 of a second quicker in the quarter, even with a traction problem it didn't have with the stock manifolds.

73 340 driver side 2 1/4 outlet and 93 Dakota passenger side manifold 2 1/8 out let with head pipes to fit automatic trans with manual or power steering. Located in Los Angeles $500 for everything

Step headers? That's a new one on me...it looks like I have some Googling to do. :)

i have a 72 roadrunner 340 engine sitting on a stand, but never paid much attention to the changeover,, thanks for the heads up. regarding early blocks in later cars, I helped junk out a 1974 charger R/T 440, and it had the 440 with casting date of jan 1971. Apparently there was a bunch of...

Here's a low cr 2bbl 318 with headers dyno's 182 hp, even if you add a decent amount of cr you get a 3-4% power increase so 190 hp with headers. https://www.motortrend.com/how-to/mopp-0312-318-long-block-bolt-ons/ Here's a low cr 360 at one point around 3:45 time mark, stock low cr, 1.88...

My plan is to use my 318 to get the car sorted out then stroke to 390.. only thing i'm wasting is the cam which isn't a huge deal.. current heads/intake will go to the new motor.. nice to see some dyno numbers of a 390.. from what i'm told a 408 will do double the power though.. (a joke...)

Sounds about right. You just cannot preach headers to some folks though. They won't have any of it.

Slight correction. The hole is 2-1/8 on the mag and about 2-1/4 on the good 340 units.

...its a depends no blanket one size fits all headers will gain this much all the times ect etc etc etc.... A lot of times ppl have say 340 manifolds with stock head pipe thats 2 inch off manifold pinch 1/2 inch around torsion bar then goes into 2 1/4 pipe drivers side. They take all that off...

Oh and when running this model you MUST, MUST have headers to crest the 300 HP line or you may not make it. Stock 340 manifolds capped you at about 290 HP

I’m not questioning the stock 340 cams have a following. That’s why I requested responses of members running Solid Lift Cams with manifolds.

I have a second set of 340 exhaust manifolds no repairs Nice condition 650 plus the ride in Crossville Tennessee

You two guys above, the low compression years of the 340 and all the HP 4bbl 360 engines (IIRC) used the same early 340. 350’s could be had with a smaller 2bbl cam and a 4bbl. The exhaust valves for the 340 & 360 are and have always been a 1.60. The intakes for the later 340’s and all 360’s...

I was surprised at how mean and nasty it sounded with the manifolds! I agree a 340 or 360!

Of course it is much better places to spend 1k bucks for tti 12hp nitrous 900 bucks=rocket ship on demand light weight

No, I installed them in 1984. Likely bought them in 1978 or so. They have the same port openings as the driver's side so maybe they were for later 340 and 360s with the non HP manifolds?

Hi Folks What are your opinions on this combo? 340 with Comp XE262 Auto Trans with 323 gears Original TQ carb 1969 HP exhaust manifolds 2 1/2 inch TTI head pipes 2 1/2 inch TTI Exhaust pipes with H pipe Flowmaster 409S mufflers 2 1/2 inch TTI over axle tail pipes with turn downs. In a '71...

I've never looked at a 318 and 340 log manifold side by side before. Interesting how the 340 manifold is larger, outlet diameter excluded. Makes me think the factory saw value in making it bigger.

I personally wouldn’t try double exhaust gaskets. It may hold, but I’m not too warm and fuzzy on the idea. Worth a shot! I second that. Even on a very mild cam and compression engine, it’s a winner.

I took the photo 16 years ago. About 9 years after this photo, I ditched the 2bbl setup and 318 manifolds with a 4bbl and 340 exhaust manifolds.

Depends on the combination. The stock 340 and 360s were designed to incorporate manifolds. Very mild builds. "Just" bolting headers on and nothing else would garner very little, unless you also upped the ante with the carburetor.

Thanks, I got tired of messing with the Offy as I was trying to get 340 built. And get to Moparfest which i missed lol. So I pulled it off the 273 and shelved the setup for now. Once 340 is installed I'm hoping to put commando pistons in 273 and then take a stab at dq again. They just look so...

Gentlemen, you realize our competition: Chevrolet, offered 2x4 bbl and stock rear dump exhaust manifolds on a 302 ci with a smog pump! Was this a fluke? I'm confident Mother Mopar wasn't far behind. The six pack was rated at 1000 cfm. Ma mopar used manifolds on the TA. Seems logical that one...

I bought same NOS dual quad thinking I could use on my 340 build(x heads)....not a chance lol. Like you said the outside of the flange vs the port, you could see daylight lol. So it went on 273 for a short stint lol. I love the looks of them. Intake gasket is Felpro 1243 273/318 size. Orange...

For Sale: One nice used set of 1968 through 1970 340 HP exhaust manifolds. Heat riser dial in place but butterfly removed. Little to no pitting on these nice shape....No visible cracks or repairs anywhere that I can see. Removed from a 1969 340. Ready to run. Passenger #'s are 10-6-8 2863549...