I currently have an engine builder that will be starting on a 440-512 stroker build for me. Was curious on experienced people’s thoughts as this is my first Mopar BB. The goal is 600hp or there about. I’ve read many different builds on here all with varying opinions and different levels achieved. The builder is still hashing out details as we don’t completely agree on a few things though I know he’s very well versed in Mopar race cars.

The build will use molnar 4.25 crank 7.1 molnar rods.
Diamond pistons.

One case of contention is the heads. I can currently get either trickflow 240 or 270 heads. He says get the 240s the 270 require and intake I can’t even find to buy right now plus he says it will not make for a good street capable engine.

Cam is undecided but he’s thinking a simple non roller solid cam not sure what good specs would be to achieve goals. I’d like the idle to be noticeable.

Second point of contention is what intake. I wouldn’t mind a victor or trickflow if using the 240s. He says performer rpm.

Last is carb. I’d like to have a Holley. He says they all leak and only uses them on race cars. He prefers an edelbrock carb.

Details for the goals and of the car are 66 satellite full car. Probably 3800 pounds. Daily driver about 25 miles each way. Gas mileage doesn’t matter to me. Car has air conditioning and I plan to keep it. It’s currently a 4 speed 18 spline a-833 with a moser built 8 3/4 and 4 link and coil over rear suspension, mini tubs and 3.73 gears with 275/60-15 though I may go wider Mickey Thompson street slicks. Car may see a track once or twice a year beyond that the goal is 600hp and torque somewhere in the 11s at the track and the ability to fry tires at will at 25mph and drive it to work. Car has power brakes disc front drum rear. Ignition is msd 6al and pro billet distributor on the current 440 which already has a performer rpm intake. Also car has 1 7/8 tti headers electric dumps and full tti exhaust and x pipe and fuel cell and electric Holley pumps. And access to 91-93 octane isn’t an issue. I’m on the east coast in North Carolina at or just above sea level if that matters.

Thanks for any help. Sorry just trying to be as descriptive as possible of cars and goals.

Your engine builder's ideas are pretty good. If I was building that engine for that application I'd use the TF 240 heads and would not even consider the 270 heads. The intake choice could go either way. You already have the RPM manifold and it would work on your new engine but will kill a bit of top end power. The TF intake would be the best choice for power if you have room under the hood for it.

I'd put a hyd roller in an engine like that but you can make a solid flat tappet cam work if you're super careful selecting parts and breaking it in. With a hyd roller I'd stay in the high 230 or low 240 range for duration at 050. You do not want (or need) a lot of duration when using the TF heads. The TF heads flow a lot of air at low valve lift so too much duration will kill the power and make the engine run poorly on the street. You need to work with a pro when picking the cam for those heads. Your engine builder may or may not have any experience with the TF heads so talk it over with him. If you need another opinion talk with Dwayne at Porter Racing Heads. Dwayne can get you a custom grind that will match your combination and really make the car come alive.

For a true street car your engine builder is correct in choosing the Edelbrock carb but a Holley could be made to work if you pick the correct one. Personally I'd put a Holley Sniper on it. The Sniper adds a little bit of cost but you gain a built in data logger as well as complete computer control over the fuel curve and the ignition timing. I wouldn't build an engine like that with a carb but some people still do so it just depends what you're comfortable with.

Andy won't he have to swap out gas tanks for the sniper?

I'm sure no two people ideas and excepting the rough idle and tire spinning of Hi Po pump Gas street motor are the same
I like power, lots of it
On your deal make the builder do it your way
My last pump gas street car ran a best ET of 9.993 at 134.8 MPH corked up with the air cleaner on at Woodburn Drag Strip in Woodburn,OR about 180 ft. above sea level in late July with a DA around 1700 Ft. on ET street radials That was a 400 block storke to 4.300 with a 4,375 bore, Indy SR M.W.ports and a Indy 400-3 intake with a Holley List # 9375 non HP 1050 CFM Dominator carb. running Oregon 91 octane pump swill. That was a 1971 Duster that weighed right at 3450 Lbs. with me in it ready to race with a full stock gas tank
On your deal I would insist on using the Trick Flow 270 and use a EFI throttle body system like Andy F is suggesting, they work good I would use a Indy 440-3 Dominator flange or the Indy 440-2 intake with the 4150 flange on it depending on which size throttle body you choose. More air and more fuel = more power
Be careful on street driving it at first, that combination will make well north of 600HP and more torque than HP.
I have a 1966 Dodge Deluxe two door sedan that I fix up to sell but I haven't driven it yet, to much bracket racing It has a 3.91 stroke 440 motor (470 C.I.) with a set of the old Herb McCandless "452" smog heads with bigger valves, RPM intake, 850 Holley D.P., Hooker 1 7/8 with 3.0 collectors and a full 3.0 inch exhaust system to the rear bumper. Dana 60 with 35 spline axles and a early dana 60 Posi with stock Dana 3.55 gears with a NP833 overdrive 4 speed in the car with 275x60x15 tires on the rear. I had the rear end moved forward three inches and had the rear wheel wells stretched 5 inches to hide the rear end being moved
I need to take it to a front end alignment shop and have it aligned and check to see if the rear end is in the car square or not still
Good luck on your build
Keep us posted please.

"Last is carb. I’d like to have a Holley. He says they all leak and only uses them on race cars. He prefers an edelbrock carb."

You have a cool build going and your builder wants to put a CarterBrock on top because all the Holleys leak?

You are right to doubt his advise on this one. Whatever you put on top of that stroker will need to be tuned. And a CarterBrock is a real pain to find tuning parts for and to tune compared to a Holley. Especially in the very critical idle and off idle area. Unless you have a very talented CarterBrock tuner handy, there is no way you should put one on top of that cool build. And if you doubt that, just look at a tuning chart for the CarterBrock that you are considering.

Here is one example: https://edelbrock-instructions-v1.s3.amazonaws.com/edelbrock/carb-tuning-guide.pdf

lol, why are you using an engine builder who's advice you disregard at each turn?

It appears you aren't hiring him for his expertise.

Andy,

I thought you said the terminator efi was a lot better than the sniper for only a few hundred more?

I would call Dwayne porter and let him get the heads he says will work, the 240 or the 270, then let him work them a bit and check them over. Worth it to be sure before you use as a daily driver. Let him spec the cam.

I’d be going roller or at least not a solid for a street car you are talking about driving hundreds of miles a week.

The RPM is an excellent intake, sounds like a good idea to try it and economize and then later try another intake if you want.

I’d put the savings into a milodon 31580 road race pan. It’s a superb piece and will protect your investment.

Another option since you are in NC is to just call Todd Marsh at Marsh Performance. I used him for the bottom end of my 496 and Dwayne for the heads. Had local shop do the machine work.

Good luck.

For the same reason people take medical advice from a politician instead of a medical professional !!

No way I'd put an Edelbrock carb on a big inch solid cammed stroker. Holley or injection. I'd also consider a small street solid roller cam...I run the Comp XR280R in my 10:1 470"...idles nice,pulls hard, minimum maintenance

I would agree. Seems Edelbrock carbs only go up to 800 cfm. Holley you can get just about any cfm you want.

I also agree.

The 512 is bigger than my 451 but if using an easy street cam the 800 AVS2 anular is the bomb on mine comming from a Quik fuel billet DP.I have the mopar 528 and the street manors are great. Dont smell the exhaust any more and will rip too.Was suprized how easy to tune it in out of the box , Lights up on the first crank with no choke.

Yeah I ran an Edelbrock 800 on the 512 in my Coronet before I switched to EFI. The 800 carb supported 600 hp once it was converted to dual feed and had larger needle and seats installed. The Edelbrock carbs have a better idle circuit design than Holley carbs so they run smoother at idle and off idle. The 800 is a good choice for a street driven stroker engine. A race engine will pick up some top end power from a big Holley but the street manners won't be quite as nice as the Edelbrock. A person just has to decide what their priorities are.

A few points as I have a 505 that gets driven and raced frequently...

We run an 850 Demon carb. It seems to do everything well and zero issues since installing in 2016.

The 8 3/4 is short-lived in an application like this. I would highly recommend upgrading to a Dana 60 or 9 inch.

Don't overcam and don't overgear. These make huge torque so all that isn't needed. A mild hydraulic roller and 3.54 gear works fine.

Put a good set of drag radial style tires on it. A regular 400 treadwear tire is like driving on ice with these.

My car is 3,700 lbs. across the scales and does really low 11's on motor alone with pump gas and mufflers. It has a Holley Street Dominator intake that probably costs me some power but fits under a stock flat hood.

I ran a Street Dominator on my 500" for a couple of years. Even opened it up for a 1050 Dominator. Intake worked well and fit under the Shaker. 500+ cubes love the 4500 carbs.

I wish the 240 heads were available when I built my 493. I would go with a hydraulic roller if it's in the budget but a solid flat cam would do the job just make sure you get the EDM style lifters. I have both a Victor and an RPM for my car but I like the RPM better for nice off idle seat of the pants feel. I prefer a Holley style carb but my 800 AVS ran pretty well with the RPM but my plugs showed a lean condition with the OTB tune. I went a little too much with my new cam, 248/ 620 makes nice power over 4000 but it's a little soft down low but the 4-speed helps with a 4.10 gear. I'm running a QuickFuel 1050 annular body and it's really responsive if you decide on a Holley style carb.
Gus

Just my thoughts...I agree the 240 heads are probably the better choice. My thinking on the intake is to go w/ a single plane. This is a 512" stroker w/ smallish heads...no need for a dual plane.
I wouldn't be running an Edelbrock carb on this motor. Holleys don't leak unless you screw something up and you need more than 800 cfm in my opinion. And I like Edelbrock carbs...about to freshen up a 1407 for a mild 440 build I'm working on.
Go with roller cam. Personally I'd go w/ a mild solid roller from Dwayne Porter.

FWIW, the 512 RB I had used Indy EZ1 heads and their single-plane (which is too tall for a flat-hood Duster).
It had a junk Demon 850 on it which we couldn't clean up, so I swapped my spare 750DP race carb on.
It had really good throttle response, surprising to me with the single-plane & big ports, but 512" seems to "cover" that.
I pulled the 3.91s and swapped to 3.23s, barely noticed except on the highway.
Comp hyd roller, not big but don't recall specs; kinda noisy but no problems.
FBO distributor, F150 epoxy coil, TTI headers, full exhaust with X-pipe.
3500 stall, 275/60 tire. Basically a street car with a big motor.
Ran 11.30s like falling out of a tree.