440 How would you build for 700hp

505Coronet · Dec 18, 2019

Long story short im pulling a RV 440 engine out of my rock crawler/prerunner (75 Ramcharger) and tossing in a 500" crate stroker to take over its duties.

The 440 is drinking coolant and overall just low on power/tired. The plan is to tear it down, sonic check it, and if all looks good build a full out performance motor.

my 69 Coronet has a 505 stroker with a touch over 600hp. very little street manners (which is fine with me) and runs like a raped ape.

The goal is to build either a bigger stroker (523-548) or a roots blown (8-71?) motor that can take the coronets engines place if (lets be real, WHEN) i manage to take this one out. Im favoring the 8-71 build because ive always wanted a roots blown b-body.

So my question is, how/what would you build. It will be over a year build time, money is a factor but not in sacrifice of quality.

To keep guidelines id like to shoot for 700-750hp on pump gas as i believe thats toying with the line of a stock iron blocks capabilities

snakeoil24 · Dec 18, 2019

Simple put a blower with fuel injection

biomedtechguy · Dec 18, 2019

505Coronet said:
like to shoot for 700-750hp on pump gas as i believe thats toying with the line of a stock iron blocks capabilities

I think that you will find any weakness in even a good factory block at that power level, and if boosted, walking that top boundary (or past the "limit" in this case) any error in boost application that either leans the A/F ratio out or bumps the boost past the level it takes to make 700-750 is going to be catastrophic.
When I was going to build a 6XX HP and torque factory block engine, this is the cap and girdle system I had decided to use. It has aluminum caps and makes for the strongest, most "tied in" foundation of ANY cap and girdle system IMO. If you move forward with this plan, good luck. I suggest that you read the description of the BCR setup, look at the pictures and see how it ties in to the apron, and if you like what you see, call Jerry at BCR and ask him about his design. My local builder was totally impressed by its unique design.
http://www.bcrproducts.com/caps_and_girdle_system.html

Cranky · Dec 18, 2019

A blower would be cool for rock crawling imo. Depending on where you would be doing the crawling, you could swap pulleys for very low end boost if needed. What about using a late model crate engine instead of the early one? They seem to do 700 hp easily enough....

biomedtechguy · Dec 18, 2019

I'm confused. There's a strong 500 stroker in the Coronet, and a worn out RV 440 in the 75 Ramcharger 4WD.
What are you doing with the 500 stroker in the Coronet? Are you buying a pre-built stroker for the Ramcharger? Are you asking about building the RV 440 (if it is ok to use) for a replacement engine for the Coronet?

Ironbuilt · Dec 18, 2019

505Coronet said:
rock crawler/prerunner (75 Ramcharger)

Jeremiah · Dec 18, 2019

Step 1 : Use a 400 block.

Step 2: Trick Flow 270s

The rest is more or less dependant on where you want the power band.

IQ52 · Dec 19, 2019

Gotta love it. Design me a 523-548ci engine @ 700-750 horsepower for free. Or a blown smaller engine at the same horsepower for free.

You're in luck! AndyF has already done that for you, look up his posts. He has done that with a normally aspirated, pump gas 470. Your Coronet will love you!

505Coronet · Dec 19, 2019

Sorry if the intial post was a little confusing.

Im pulling an RV block 440 out of my ramcharger, this is the block i intend to build (assuming sonic checking and such deems it suitable) as it is free. I am putting a crate stroker back into the ramcharger.

The motor i want to build would be a backup/replacement for my coronet should my right foot decide it needs more go power/drop into another project.

I have no desire to go modern powerplant, as this is a project for me and i enjoy the old stuff.

I also am not asking someone to design me something for free. I could go buy an indy crate or big al's toybox crate and be done with it. As i could equally ship the block off to a local builder and let hims have free reign. Im asking for those who have done it what would you do again vs what would you have stayed away from. Would you go solid roller again? Would you fully port the heads or just match port? would it have made more sense to buy a blower kit or piece it together? Things like that. If anyone feels their knowledge is only to be divulged if being paid to do so then by all means keep it to yourself.

Pictures as requested

440 with msd efi, dana 60 front 14 bolt rear, 5.38s, FMVB 727, atlas transfer case, full tube chassis (ultra 4 spec) 42" TSLs. Basically a fully capable prerunner designed as a lifted old rig

69 Coronet

Engine Bay

biomedtechguy · Dec 19, 2019

IQ52 is a top choice for solid information on this forum.
Now I am clear about what engine goes where.
AndyF is another great source for information.
I'm reading his book "How to Build a Max Performance Mopar Big Block" and I highly recommend it!

Hemirunner · Dec 19, 2019

1. Get big blower assembly
2. Get electromagnetic clutch pulley
3. Watch Lone Wolf McQuade
4. Combine and enjoy

biomedtechguy · Dec 19, 2019

Hemirunner said:
1. Get big blower assembly
2. Get electromagnetic clutch pulley
3. Watch Lone Wolf McQuade
4. Combine and enjoy

Bigfoots N Mopars · Dec 19, 2019

Jeremiah said:
Step 1 : Use a 400 block.

Step 2: Trick Flow 270s

The rest is more or less dependant on where you want the power band.

my 400 based 512

stage3 · Dec 19, 2019

Bigfoots N Mopars said:
my 400 based 512

nice numbers! my 446 with trickflow 270's is at the machine shop now waiting its turn in the work que,,,,what cam r u using to achieve the 720+ HP? i will be using a crane 688801 with 1.6 RAS rockers with an indy tunnel ram with 2 750 DPer's.

biomedtechguy · Dec 19, 2019

stage3 said:
crane 688801 with 1.6 RAS rockers

From the Summit ad for that cam number:
"Mechanical Roller Tappet, Advertised Duration 292/300, Lift .630/.630, Mopar, Big Block"
:thumbsup:

PRHeads · Dec 20, 2019

IQ52 said:
Gotta love it. Design me a 523-548ci engine @ 700-750 horsepower for free. Or a blown smaller engine at the same horsepower for free.

C’mon Jim.
I know you could rattle off the basics without even thinking about it too hard.

Unless it’s a motor I’m building myself, I’m not going to get into the nitty gritty details about any motor build.
Especially in an on line forum.
Those things are between the owner and whoever is building the motor.

I see it like this......the basic gist of a 700hp 505 is easy enough.
330+ cfm heads, 11:1+, I’d use a roller cam and a 4500 carb, 2” headers(although I just saw a dyno sheet from a customers Street/strip 505 with a 4150 that made 730hp...... so the 4500 def isn’t mandatory).

With a roots blower it’s even easier.
Think of a 575-600hp build....... lower the cr to 8.0-8.5:1....... add boost and a smaller, wider lsa cam.

biomedtechguy · Dec 20, 2019

PRHeads said:
I’d use a roller cam

Solid or Hydraulic?
I'm guessing you will say solid. Is there a performance application where a hydraulic roller would be OK?

stage3 · Dec 20, 2019

biomedtechguy said:
From the Summit ad for that cam number:
"Mechanical Roller Tappet, Advertised Duration 292/300, Lift .630/.630, Mopar, Big Block"

yep,,but with 1.6 rockers, the lift goes up to .665. i have the dyno-sim computer software, its fun playing with differant combinations. its says my setup is good for 785 at 6000 rpm's. and moving around installed cam advance/retard is goes up more and down.for what its worth. free of charge!

PRHeads · Dec 20, 2019

Is there a performance application where a hydraulic roller would be OK?

The target in this thread was 700-750hp.

I wouldn’t choose a hyd lifter if that’s really the goal.

Hemirunner · Dec 20, 2019

biomedtechguy said:
Solid or Hydraulic?
I'm guessing you will say solid. Is there a performance application where a hydraulic roller would be OK?

You need to stop asking this question and accept the fact that you can’t run hydraulic roller cams in a Performance Application!

440 How would you build for 700hp

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