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bigblockmark

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Reply with quote  #1 
Looking at purchasing a used Pro Systems 4150 #41496. (2nd owner does not have build sheet.)

 It is jetted 90 and being used on a SBC 434 engine currently. Said to be 986 CFM.

Is this a 950 size carb? Venturi and throttle plate size?

Being considered to use on a limited class 4 wheel drive truck pull. 750-800 HP 468" BBC with a class requirement of 4150 size and Edelbrock Performer Plus dual plane intake manifold.

It is currently using a 850 CFM 4781 Holley reworked by Davinci, but still has OEM metering blocks. 850 works well, just looking for a little more HP and adjustability.

Any guidance appreciated. Thanks Patrick.

PRO-SYSTEMS

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Reply with quote  #2 
41496 is 986 cfm and is a good candidate for your power level.
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bigblockmark

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Reply with quote  #3 
If this is 986 CFM, about how much more flow is that than a Holley 4781 body with the choke horn removed?

How does the venturi, throttle plate and booster sizes change from a 850 to the 41496? Both are 1.75" throttle plates?

This truck pull class rules require use of a BBC Edelbrock Performer Plus dual plane intake manifold. Will that allow the larger carb to make more power than the Holley 850 did?
PRO-SYSTEMS

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Reply with quote  #4 
A 4781 is the same size BUT has a less than optimal venturi shape so after the horn is milled down, it flows about 60-90 cfm less depending on the body and the booster location and size.


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