I hit it lucky and didn't have to clearance the block at all but it is a snug fit as it sits. I did have to clearance the pump almost to one of the screws. Last motor was a little over 600hp running with this pump and held a steady 7psi all the way down the track. Hopefully it will keep up with the new motor as well. Time will tell.

What block do you have? I really do not want to grind my block

What block do you have and do you run a return line?

There is ONLY SO MUCH atmospheric pressure available to push the fuel into either pump. Same as on the oil pump, (except if you run a vacuum system in your crankcase there is less atmospheric pressure to push oil into the oil pump).

The atmospheric pressure will have an easier time pushing fuel through an 18" hose into an electric pump than it will have pushing the fuel through an 18 foot line up to the mechanical fuel pump. This is a fact of life. After the fuel gets into the pump it doesn't matter what the atmospheric pressure is because now it is the pump pushing the fuel into the carb.

R.

PS: Pumping a huge amount of fuel and using a regulator to return most of it to the tank heats the fuel and hurts performance as the engine runs. That's why it is better to have the system adequately sized, but not excessively huge.

from their website:
And, according to Dyno figures, it takes approximately 10galllons of gas per 100 HP per hour, the Clay Smith Power Pumper will theoretically handle up to 1300 HP on gas or 1150 on alcohol !

"THEORETICALLY" Just like your signature says, Without Data, you’re just another guy with an opinion.

I'd like to see that data that proves this will support 1300hp.

NASCAR did it back in the day. My 514 uses 360 lbs of gas an hour to make 900 hp. That is 60 gph.

Thanks everybody
I called clay smith they recommend to run the pump with a regulator , check valve with a return line. I am running a cross ram with 4235 and 4236 carbs any suggestion on how I should set up my fuel system and lines.
Thanks

Rigid 1/2" stainless feed lines, parker braided Teflon between the pickup and hard line and frame rail to the pump. Tim

Mine is ran like this.

1/2 inch pickup in the tank with a 100 micron filter before the pump, 1/2 line to the pump then 3/8 lines from the regulator to the carbs. and probably a 5/16 or 3/8 return line

I would have to go down and look but I am pretty sure it is a '72 or '73 440 block.

A '73 440. I mocked it up on a '78 400 and no grinding was needed on the block.

Some Mopar RB and B blocks have a half moon shape machined into them by the fuel pump, some don't

Hopefully the pump will fit.
Picture not working, I need to take new one
moparts uses old tech, I have to set my phone on old settings

Here is a picture on my block. Hopefully the pump fits.
I have a solid roller cam. Is the stock fuel pump pushrod ok to use?

No. You need a bronze tipped pushrod to use on a billet roller cam.

Any recommendations on who sells them?

Mancini

That one will do it easy
claysmith nfg

Thanks
Now how figure out the plumbing and the return line and make it look good.