holley 4150 vs. 4150HP

[mshred]

Hey guys,

I am in a bit of a dilemna between going with a regular 4150 carb that actually flows a little more than an HP carb and im wondering what the benefits of the HP carb are...the 4150 im looking at already has upgraded metering blocks, upgraded floats, and screw in air bleeds, as well as no choke horn and flow ability that actually surpasses the 750hp body by a couple cfm...this is a totally remanufactured carb with all new parts...same carb with an hp body is a little more money

was told that the hp body will deliver crisper throttle response due to a higher signal strength as well as a few more hp up to 4000rpm, but after that everything is pretty much even...just wondering from you guys who have used both if you think the extra cost of the HP body is warranted over the 4150 i mentioned just for those extra few characteristics (or anything else im forgetting to mention)...am i going to notice any difference in power by going to the hp? am i leaving anything on the table by going with the 4150? the price difference between the 2 isnt much (less than 100 bucks), but we all know that money is money these days, so every bit saved helps

hope this makes sense...interested to hear all opinions on this subject!

Thanks!
Matthew

 

[mshred]

nobodys even done a mainbody swap to and noticed a considerable difference?

 

[LXguy]

I'd get a quickfuel before I bought a Holley HP.

Who did the work on the non-HP carb you're looking at?

 

[demon seed]

What intake manifold and cam are you using Matthew. They could determine the net result if you're looking for a big improvement.

Terry

 

[mshred]

hey guys sorry i didnt respond earlier...

first off, the carb i am using is getting done by a company called dillman race carbs and induction (search him on ebay as drc&i)...im getting a 750 dp no choke with all his stage 4 mods (they are listed) plus screw in bleeds, for a very good price...for the HP main body upgrade, he wants 75 bucks...he's actually done testing with his carb against 13 other brands (quickfuel, proform, willys, etc. being some...all same afr on same motor and same cfm, his carb beat all except the two boutique brands and quite signifcantly over the prosystems...pretty good work imo)

terry, my intake is an rpm air gap and cam is a mild single pattern comp 280H (480 lift, 230 duration at .50 280 at valve)...very mild motor, in fact the motor is stick except for the cam, intake, headers and now carb

 

[dgc333]

You will very likely not get any more power with the built 750 than you would with a stock 650 on a mild 340. The engine certainly won't be able to use all the capacity of a built 750 but on the plus side it should work well and not have the low rpm driveability loss a stock 750 would have compared to a 650.

 

[mshred]

You will very likely not get any more power with the built 750 than you would with a stock 650 on a mild 340. The engine certainly won't be able to use all the capacity of a built 750 but on the plus side it should work well and not have the low rpm driveability loss a stock 750 would have compared to a 650.

hey dave,
i thought the same thing before about sticking with 650's but here is my reasoning...Both the guy im getting it done by and prosystems recommened carbs flowing at the very least 750 cfm (in fact patrick at prosystems said atleast 780cfm, and he knows his ****)...When they designed my programs i told both of them the whole setup (very mild) and that the car is 95% street so i want the throttle response there and they both said that it will be there...im no carb expert, but if they are both telling me they can build me and tune them to work well for me in these sizes, then i kinda have to agree...i know some run 750's back to back with 650's on 340's and there is no difference in e/t, so it really shouldn't hurt me...if anything it will be a foundation for when i build more power (told them both of my plans to run nitrous in the very short future and up the cam/heads as well, and they told me these are good foundations)

forgot to mention also that the DRC&I carb builder told me that if i go up to the HP main body it saves him less work since he doesnt have to bowl blend (it already flows 839cfm at 28 inches of water) and that it has slightly stronger signal strength which will give crisper throttle response and 3-5 more hp up to 4000rpm over the regular 4150

 

[demon seed]

I'd try out the built 750 and if you don't notice a benefit because the rest of the engine is a mild build just put it on the shelf till ya need it for later modifications.

Terry