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Bought a Holley Ultra XP 950 for a 400 SBC. Came with 92 jets square and power valves front and rear. Called Holley tech and they said try it as is. Im thinking 86 front with the power valve and 92 rear no power valve. What say the experts? Thank ya!
 

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I had one and had to jet it WAAAY up due to the venturi being so large, it couldnt get a good signal to pull fuel. It ran great, but I ended up with 106 jets squared.
 

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Bought a Holley Ultra XP 950 for a 400 SBC. Came with 92 jets square and power valves front and rear. Called Holley tech and they said try it as is. Im thinking 86 front with the power valve and 92 rear no power valve. What say the experts? Thank ya!
Hey have you seen those Thompson plates? I bought a pair for my ultra xp 750 but havent used them.
Thompson Performance, LLC
 
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No sir I havent, like a super sucker?
It looks like a plate that has a fold in it that angles the fuel in more direct downward flow. I they look like just small pieces of gold plates thats cut and notched and then bent to angle flow
 

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14965878_6064504766092_2284741486996094976_n.png.jpg
 

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Old Gimmick. Stock squirter nozzles spray against the booster outside anyway. Whats the difference? Not even needed on a transbrake. Its not" what you want."
 

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Discussion Starter #9
ive seen those, not at that point yet. More worried about the jetting and power valves at this point. Thanks tho!
 

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Acc pump block. What you don't want I would think is [a] large slab of metal overhanging the venturi & blocking flow large chunk of metal that high speed air will crash into....
 

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Put a pair on my 850 Mighty Demon and can leave off idle now, not a stitch of hesitation. Car's 60ft picked up as well.
Hey if you see anyone I have a pair that I decided not to use cause the truck has other issues cranking. Ill sell 2 for 50.00 shipped if yall see anyone who is interested in. I have them in a add in the for sale section.
 
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