Quick questions... What kind is it and is it good for a street engine in the 400-450 hp range? (I know, stupid newbie questions )

 

It's a Holley 80528.

http://www.holley.com/data/TechServi...%20Listing.pdf

750 CFM, manual secondaries, double-pumper; no choke.

A racing carb, not a street carb.

Holley Model 4150 HP Carburetors: HLY-0-80528-1 - summitracing.com

Lists for $638 on Summit.

 

should I sell it or use it on my street engine? ...Remember, only a weekend warrior!

 

sell it and buy a better streetable carb

 

It has 8 passes and no street miles on it. What should I ask?

 

Use that as a clue.

Check those racing classifieds sites I told you about in your other post and see what similar ones are going for. Check eBay. I think you'll find them going in the $200-350 range.

 

I would use that carb, it will should work perfect for a 400-450hp engine assuming there is nothing wrong with it. DP carbs are great for performance, you will be sacraficing performance if you switch over to a vac secondary type carb or a carter style. Only downside is gas mileage and no choke if you drive it in cold weather.

 

The only time the no-choke will be an issue is when the engine is cold. I'm running a no-choke carb on my weekend warrior, takes a couple of minutes to warm up before pulling out of the driveway, that's all.

 

Thats what I wanted to hear. The car sees on average 20-30 miles a week. I was hoping that I could just put this one in and if I have a prob without having a choke, then I can just swap carbs right?

Thanks for the response and btw, South Louisiana doesn't have very many "cold days"!!

Jbenge, does that victor jr fit under the stock hood? If so how much room do you have left?

 

"DP carbs are great for performance, you will be sacraficing performance if you switch over to a vac secondary type carb or a carter style."

Not to get off topic but im switching from tpi to carb and i was looking at a holley with vac. secondaries for my 383. I dont know much about carbs but could you explain the difference between mech. and vac. secondaies and why id be sacraficing performance.

 

Jbenge, does that victor jr fit under the stock hood? If so how much room do you have left?[/QUOTE]

Vic. Jr won't fit under a stock hook I don't think, I have a 2 1/2in cowl.

 

ok...I'm gonna run this carb. If anyone else protests, do it now!

 

The sticky at the top of the forum (Welcome to the Carb Forum - Please Read) has links to several sites, including the Holley site. In their tech services link is a link to carb operations http://www.holley.com/data/TechServi...ech%20Info.pdf .

A vacuum secondary carb opens the secondaries based on flow through the primaries. A mechanical secondary carb opens the secondaries based on throttle opening. The main issue is getting fuel going through the secondary metering passages when the secondary blades first open. A vacuum secondary carb avoids a lean condition by slowly opening the secondary blades. A mechanical secondary carb avoids it by providing an accelerator pump shot to the secondaries.

Engines make power by pumping air and fuel through them - the more that is pumped through in the proper ratio and combusted, the more power that is made. A mechanical secondary carb makes more air/fuel available to the engine quicker than a vacuum secondary carb does, and therefore generally gets the car moving quicker. This doesn't show up in peak HP/torque values, because that's not where the difference is.