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Yep, not really worth milling stock sb mopar open chamber heads more than about .030 max. Even NA.. This is just my opinion of course…

Nope, this is what I have heard from guys going really fast with stock parts .

i wouldn't go to far milling the open chamber X or J heads, i hear if you don't have at least .100 between the "quench" area and the piston if effects the flame travel..

20 psi at hot idle is fine

Probably around 425 hp without knowing compression and head flow numbers. IF you built the car correctly then you put a higher stall converter in if it’s an auto, AND a performance oriented gear ratio which would allow you to use a 750/800/or even a 950hp carb for even more horsepower and the...

Heavily worked 71 manifold

Factory underrated all 340’s at 275hp the 4 speed cam, the t-quad with the better intake in 71, AVS 340’s around 300hp, 71 340’s closer to 315 and 6 pack a little more. NHRA pegged the actual HP back in the day. 340’s and Hemis were underrated, 383, 440, and 440 + 6 were a lot closer.

And the 71 340 with the 800 cfm t-quad makes more HP than the 625 AVS, OH…. and the 340’s with the 1350 cfm Holley 6 pack ( 950 actual cfm) make even a little more !!

I’m going to make you an offer you can’t refuse.. Swing by and pick up my 750 Holley competition #0-937 9 dp with annular boosters and choke horn milled. You can try it out this summer.

Yes. I’m going to shot for about 89% of the seat width.

Well I think this is about done!! I’m running a 6 pack intake so if I can get these to go near 240cfm at 500/550 lift with a 2.02 valve I’ll be happy. Now to start the other 7 cyl.

I have a dead head now but purchased a bypass

Do bypass regulators bleed off fuel pressure when the engine and electric pump is off? Reason I ask is I have a heat soak restart issue and I know it will help cool fuel make it to the carb if it’s plumbed after the carb but if it doesn’t release pressure in the line at shut down i may be...

Yep, I’d have a pair of those rectangle chunks of aluminum on my motor especially if I wasn’t going for stock appearing !

A little closer, man is this labor intensive.

Got rid of the guide tail. Still a little work to do narrowing down the guide.

still plugging away, the chambers are done, hand deshroud, intake guides milled down about .200, exhaust about .030. Exhaust bowl blended, still need to work around the guide boss and profile the roof hump. How much can I knock down the hump?? I’m thinking only around .010 to .020 after knocking...

That T-quad and manifold is a big advantage, but you know that I’m sure.

Yes I’m interested in flo also.

Hi Pat, yes I will, but that area is usually the lowest on the list. Most of the flow gains on these heads as I understand it are guide, bowl, and chamber along with a good valve job. These are still at 1.88 so I’m going to ruff everything in then send to machine shop to cut 2.02 size, then...

As usual a year later back to work !!! All guides have been cut down about .200”, the fel-pro 1008 gasket is close so not a whole lot to de-shroud mostly the slope towards the plug side . I also softened the divot around the spark plug.

Nice lope, when I had a 4bbl 850 it was happy at. Now with a mechanical 6 pack 1,000 seems better

Comp solid 520/540. 244/252 @.050

I’m running 11.2cr 200/205 cranking psi on a 360, with home ported J,s what do they flow?? I don’t know probably not much 230’ish.. so for an ill flowing head you better run some decent compression to squeeze what little you have in that cyl !! Now if I had ported W2’s I would not have milled...

Something like this ? Fuel Tank Sump FASS Airdog Fuelab Pump Fit Cummins Powerstroke Duramax

Yes the sender is tight, I would have to cut and drill out the 1/4” tube and add a 3/8” ..

I have a new sender like that with the vapor/ return but it’s only 1/4”. Return should be the same as the supply side size . Thanks that bulkhead might be the way to go.

That was my old setup. Cheap and easy to make, foam from summit and I think .080 or so?? Aluminum sheet, cut with jig saw, a couple of stand offs about it.. worked good to pull cool air, felt a seat of the pants difference, but no real ram air/ big HP difference.

I’ve got a brand new spectra fuel tank about ready to go in my 71 demon along with a new 3/8” sending unit. I run a Mallory elec pump and will be using a return style regulator to help ease fuel boil over when parked hot. I will run a 3/8” return back to the tank. The sender has the small...

Looking to replace my engine harness for my 71 demon 340, I remember picking one up at M&H on the southwest side of Chicago, or am I dreaming? Are they in California now? Where is the best place to buy ? Would rather not deal with year one unless they have a Christmas big discount. Thanks