I want to know if a 950 hp is too big for my combo. I know IHI uses one and I was wondering if anyone else does with a similar combo as myself.

I have a 355 210 AFR heads, 12 to 1 comp, solid 248 258 @ .50 and 520 lift cam, vic junior intake.

It seems like a lot of cam but where I live alot of people are running them and having some success.

Thanks in advance

 

cam sounds small to me . im running a 950hp but my combo is .165 over bore 350 , 11.1 to 1 comp. 262,270 dur. @ .050 and .650 lift. 230 dart pro 1 heads, and a super vic.

mike

 

go for a rat and dont come back

 

They only wet flow 830cfm if that makes you feel any better

It'll be perfect on your motor. Cam is a little on the smaller side, but your using a flat tappet, the heads will take advantage of it and make great power for ya since they out flow almost every head at lower lift.

I've literally tested alomst every size carb Holly makes on the 3 motors I've had in 3 years from the 305, to mild 355, and now this 388. All I can truthfully say is every one of them responded better "at the track" to the bigger carb, ET and mph always went up. ESPECIALLY once I finally quit dinkin around with VS carbs

 

I don't know why anyone would use VS carbs at the track but we have a local car with a blower and 2 VS carbs on it. Runs pretty good but I always wonder just how much faster it would go with 2 DP's.

My new engine gets 2 850 DP carbs this winter I should be shifting around the 7500 mark with an operating range of 5000 - 7800. It was easier and cheaper to install 2 4150's than a single big dominator. Plus there's always the "cool" factor of having the carbs sticking out of the hood.

 

Good luck tuning!!

 

My old z28 went faster with holley vs 750 than it did with the barry grant 750 dp sportsclaw. I set up both carbs.

 

VS carbs are a pita at the strip, I dont know why anyone uses them at the strip.

Going from a 650 to a 750 on a 9.9:1 350 with a 230/236* flat tappet I picked up from 110.5's to 111.85 mph on the motor.

 

For a car that sees mostly street that's probably the way I'd go too with a VS.....well, maybe not-too much power is never a bad thing With the 2 VS I used to run it was naturally alot slower and was not as consistent as my 950HP opnce I bought it. In fact I was running this 950HP on a motor similair to yours except mine was only 9.3:1. That motor had 4 carbs run on it and it got faster everytime I bolted on a bigger unit. When I had the Holley race 830DP I did not notice any ET difference or mph difference when I got the 950HP installed, but they wet flow the same so there's that answer.

Alot of us are lucky to have these cars as toys, but for most of the guys here using them for the daily grind, the VS is definately more gas friendly and will provide adequate performance too.

 

Good point, I Just see a lot of guys pulling their hair out at the track over VS carbs.

 

So when are you going to stick them on top of an 8-71?

 

I actually got better MPG with the DP. Most likely because I could feel when the pedal was at the point of opening the secondaries.With the VS carb I had the lightest spring so the secondaries would start to open at part throttle.

 

My DP isn't faster than my VS was, but it is quicker.

 

It'll respond better with future mods though, then it'll be faster

 

Holley recomended the HP 830 for me, so when I get the $ I think I'm going to get it. Anyone ever tried one of those?

 

The 830 race p/n 510-0-9381 is "basically" what an HP carb is, but still has the choke horn tower. You wont go wrong with the HP series.

Personally I would say get the 950HP since they wet flow the same, but the 950 is capible of flowing more air so you can grow into it. The 830 for your combo is an excellent choice, but sooner or later your gonna want/get more cubes and this way your money ahead. I had no troubles with the 950HP on my old mild 355 making maybe 350hp.

 

As soon as a sponsor gives me the $5000 CAD to buy one. They're just going to sit on top of a tunnel ram for now.

 

Interesting factoid: I'm running the same or slightly slower MPH this year as I was in 2001 with the 1901 q-jet. However, I'm 1.5 sec quicker now than I was then. The 750 VS replaced the q-jet, 3.73 gears replaced the 3.08's, 650 DP replaced the 750 VS, Proform mainbody replaced the Holley 650 body, cool air inlet replaced the open element, and 3500 stall replaced the 2200 stall to get that 1.5 sec reduction.

But MPH pretty much stayed the same all along.

Future plans include Comp XE274 solid cam, and Stealth or RPM Air Gap intake. That should increase MPH. But, VS, q-jet, or DP on top would most likely not change MPH.

ET - different story.

We tend to over-CFM. You tend to get away with it more with a dual plane than with a single plane intake. And, launch RPM has more to do with it than anything else.