SBM - 9.200" deck 48 degree siamesed block, 4.250" X 3.750" bore/stroke, 6.200" rods/flat top billet/boxed pistons/vertical gas ports, metric rings, small chamber W-2's, move the exhaust guide c/l over .050", 2.250"/1.550" valve combo, or biggest intake valve the throat will handle, Brett Miller intake & (see if he'd be interested in doing the heads too), dominator carb.

Technically.......The short answer is “no”.
But neither will the stock MW heads on a 472.

I doubt anything in that class is making peak power anywhere near that rpm.

The key is valvetrain stability.
The power doesn’t have to peak way up there....... but the motor has to be willing to go there.

Some of the puller customers we have run 8000+, but they all make peak power well below that.

We dynoed one for the 500” class last year. Really big bore, short stroke BBC.
Raptor heads & intake, .875” cam, Ti valves, etc........ peaked solidly below 8k....... but they run it 8500 in the truck.
Some of the guys with that type of combo turn them 9k....... this guy didn’t want to go that high.

One of the more competitive guys runs a tall deck 468” SBC with some old Busch series 18* heads.
They are grossly too small for that motor, but that thing still makes pretty good power...... and he runs it into the mid-8000’s in the truck.

I’m not sure what you’re budget is, but sometimes that ends up driving the decision making process on which direction to go.

Would it be better to go 9.6 deck on a small block just for intake choices? Okay. I wasn’t sure how bad the heads would limit the rpm capability. The ford I help with makes peak power around 7,600. And it will turn 9,000 if you let it. It also has very good heads on it. The engine builder epoxied the floors and raised the ports a bunch. I would have him do my heads but is getting older and he doesn’t want to port anymore

That’s what I was talking about........ so I see you understand how it works.

Brett Miller would be someone to talk to about the heads & intake situation for the SB.

Alright. Thank you. I will try and message him and see what his thoughts are. There is a short deck intake on eBay right now. It is the only one I have seen available

Brett has his own intake casting, not someone else's.

Okay. I knew he had one for the w7 on up. Didn’t know about the w2s. Does anybody have contact info for Brett? Thanks

You can send him a PM

W5DART66

Alright. Thank you

I have messed with a few restricted class pulling trucks, all had big block Chevy's. I have only seen two mopar powered trucks. both were big blocks, and only one was in a restricted class like you are talking about, He did use max wedge heads. Several years ago I built a NSS drag engine using the mopar reproduction heads, and I do my own porting work. I had a NHRA stock racer lend me an original cracked max wedge head that had been acid ported. The reproduction heads were not close the the acid ported head, but by measuring and working on mine I got them a lot better. I looked and can not find the flow numbers, it was several years ago. That engine with a factory maxwedge crossram in a 3,300 lb car ran 10.00 ET at 128 MPH With a mild .650 lift roller cam. the short block was a .060 440 with a stock crank and rods. So that was around 600HP at the flywheel. I think you might make the max wedge heads with a good valvetrain and camshaft make around 700HP I know enough about pulling that wheel speed can to some extent overcome the lack of horsepower, but not sure if that would be competitive. I would love to see some mopars at the truck pulls.

I built a 460 Ford for some guys with limited funds, it had to use similar rules as you mentioned. I told them they needed a lot more valvetrain, but they have been running it for several years, and changing out rocker arms, springs and an occasional bent valve is just standard maintenance for them. They seldom win a hook, but finished third in points a couple years by being about 10 foot from the leaders.

And they are having fun.

There are a few that I know of. One pulls in the same class I will be in. It is green with a white top. It’s a big block I know and runs very well. Won the Missouri state fair a few years back I believe. Not sure what heads he runs tho

The last run of the repro 518’s were the best flowing.

To give you an idea of where they can start out....... with 1.88/2.14 valves, a decent valve job, and a minor bowl blend...... you end up with:

4.375” bore, 3/4” radius plate, no tube on ex, 28” test pressure:
Lift—— in/ex
.100— 67/57
.200— 132/107
.300— 194/141
.400— 232/171
.500— 244/195
.600— 259/212
.700— 263/222

This set was after the version with the freeze plugs on the ends, but I don’t think it was the last version.

I never had the various versions in the shop at the same time, but how I remember it is, the last version had the chamber wall moved a bit farther away from the intake valves, and maybe a slightly revised short turn.
They have better flow ootb(270’s) and are easier to get to over 300cfm.
The version with the freeze plugs seemed to be harder to get to that point, and took some chamber work to get the mid-lift numbers to come around.

That is before any major port work?

Just the bowls.

The latest version was about 10-20cfm better with with that same amount of rework.

Looking through some old notes......
on a set I did that had the freeze plugs on the end(first version), with the seats/bowls cut, but before any porting........with 2.19/1.88 valves...... 255/184@.700
Opening up and blending the bowls and rolling the short turns got you to 282/225@.700
Clean up the rest of the runner, trim the guide bosses, sand roll finish.......brought the numbers to 300/238@.700

Edit- I found some more numbers from when I did that set that had the freeze plugs in the ends.

Ootb with Ferrea 2.08 intake valve and Manley 1.88 exhaust valve:

Lift—— in/ex
.100— 66/53
.200— 139/99
.300— 192/137
.400— 224/159
.500— 238/174
.600— 241/180
.700— 243/180

Blend bowls, minor roll of SSR, still ootb VJ:

Lift—— in/ex
.100— 64/55
.200— 143/105
.300— 196/138
.400— 241/167
.500— 253/191
.600— 259/204
.700— 263/217

Okay. Thanks. I know benches are just a tool. Is the port shape better on the w2 to where it would make more power at 300cfm vs a 518 at 300cfm

Since the platforms are just different animals...... I’m not really going to go there.

However, the w2 would be smaller than the 518 if they’re both flowing 300...... so it’s a more “efficient” port.
But that doesn’t really answer the question imo.

One thing to look out for on the MP 518’s is core shift in the chambers.

I’ve seen them where even the largest bore gasket(4.600) still overhangs the chambers, when they’re not properly positioned relative to the head bolt and dowel holes.
They haven’t been available in a while........ and I know of a couple people who paid pretty good money for some bare castings.

I will say this......
You had mentioned 700hp?
I don’t think that number would be too hard to reach with a 472 and the 518M heads.

A normal port job on some 286’s with big valves will also flow 300, but the exhaust ports aren’t great on those heads...... and they seem to be pretty crack prone when pushed hard.

Thank you for the info. I will weigh my options out and maybe start looking for a set of 518ms