carb size.

Ok, I wasnt going to post this, but I figured I might as well get some opinions.
for those that don't know, I have a 65 chevy 327 in my jeep. It has a holley 650 double pumper carb on it(thought it was a 750, but found out its a 650). put the jeep in the shop because I was having trouble timing it and setting the carb. They timed it in, but said the carb needs rebuilt and is too big for that engine. So,, I can get a edelbrock 600 carb for 100.00, the guy said he thinks its fine as is, seemed ok when he pulled it out of the car 3-months ago and has been sitting on a shelf uncovered since.
My question is. With money being very tight do you think I should just rebuild mine(rebuild kit is 38.00) or see if he will take my carb and some money to boot for the edelbrock?? I know the holleys are not very off-road friendly, but im not too worried about that right now. I will probably just drive the jeep around this summer for enjoyment and work out all the bugs as im just now getting the jeep up and going. The jeep will probably see very little off-road this summer,(but we all know how that go's).
So whada ya thank???

 

Well, I'd take the opportunity to get rid of the 4150 Holley. The Holley street carbs have lots of issues on a Jeep - they just don't work well off the pavement without a lot of work and new parts. Sell it to somebody that's building a rat rod.

Used parts are always a gamble - there's a reason why they are being replaced. Especially with a carburetor, if you are not an expert on these fussy, fiddly devices.

If I really wanted to keep the 4V configuration, I'd get a Holley Truck Avenger (TA) carb instead of an Edelbrock. I'd also go toward the small end of the range (ie the TA470) - the smaller carb will sacrifice a little top end power, but it'll have better fuel control (better drivability) and potentially a little better economy, if you tune it right. And it should drop on and run good right out of the box.

 

If off roading is not a primary concern, the 650 will work just fine on a 327. However, as posted above, a Holley double pumper is not off road friendly, so you might be better off spending your money elsewhere. I've never used an Edelbrock for 4wheeling, but I have a lot of experience with them on street driven cars (I worked in a speed shop many years ago & installed a lot of them) and I like them a lot.

 

A 650 DP isn’t too big for that engine.
I wouldn’t be surprised if your problem isn’t just a blown out power valve. I don’t know much about Holley DPs, never worked on them personally, but from everything I’ve heard from Holley guys that’s a common problem. They tell me if you backfire through the carb it’ll blow out that power valve and run like stink until replaced. I’d do the rebuild kit and just make sure it comes with a new power valve, might even look into some power valve protection. Seems like there’s some kind of orifice that can be installed to limit the pressure if it should backfire through the carb and help save that power valve.

 

Another 2 cents-the 650 Holley 4777 is way more carb than you need on a 327 unless you have some aftermarket big heads, big cam, high compression, and 7k capability. At 100% efficient induction (not possible without forced induction) and 7k rpm, I get the needed volume of 662 cfm. At 80% efficiency and 6k rpm, a 450 cfm will do just fine.

The power valve is easily blown and something you should check, but you can get a check ball kit which is an easy install that cures that problem.

And no, the end pivot bowls just will not work well off-road, even with baffels, extended bowls, whistle tubes, extended vents, and spring loaded needles (I tried all of them). I even machined a custom boat wedge to tilt the carb forward a couple of degrees but when you get the nose up and side to side bouncing, there is just no way to actually control the fuel level in an end pivot bowl. As in DEAD motor in a situation where you REALLY do not want a DEAD motor.

A Truck Avenger 470 would work very well on there (which I might point out is also a 4150 series carb). I have run a couple of the Edelbrocks, and I still think the Holleys are the better all around carb.

 

Because you stated "money being very tight", I would just rebuild the 650. It will work fine for street use and you can save your money for a NEW replacement. Buying a carb that "seemed ok" when it was removed is like buying a car that "ran when it was parked:?", a big gamble. If you rebuild it be sure to clean all the passages. My favorite is Berryman B-12 and a face shield is MANDATORY, you WILL squirt yourself in the face at least once.

 

There you go, that’s what I was thinking of.

 

or more than once, just sayin........

 

Holley 4150 is a notorious leaker, especially with today's alcohol mix fuels. The end bowl gaskets and screws are the common location to leak. The Edlebrock carb is a bathtub bowl with a top cover, and much less likely to leak. I've not had a leak problem with my Edlebrock.

 

Thanks guys, I was thinking I would just rebuild the 650 and use it until I can get a decent carb for off-road. I knew the holleys are what I would call junk off-road with the flooding issues. would love to get a Q-jet for it, I had one on a 304 once and rolled on my side and the jeep never stalled. We shut it off and rolled it back over and kept going, I was shocked. anyway, thanks for the advice, looks like i'll learn how to rebuild a carb. yea for me!! I'll let you know how it turns out.

 

Here is the link for the ball check kit. Absolutely install one-not worth having to repace another power valve for what the kit costs.

http://www.summitracing.com/parts/HLY-125-500/

 

Thanks for the link. Ordered the carb kit today.

 

I'd second the qjet- a Rochester. It'll give you best fuel mileage you can get out of a carb and best off road performance and excellent street performance. Why not find someone with a working qjet to trade your holley for ? If you needed to, you can buy an adapter to bolt the qjet on.

 

I have run them all on various trucks, Blazers, jeeps and boats. Hands down the Edelbrock series has been the best for me. My last Edelbrock was on a 400hp 350 in an offshore boat. The engine ran perfectly, every time for years. The issues I have with the Holleys is stall, hesitate and bog. The Edelbrock never stumbled even under a severe over load condition. They just seem to respond to the signal better and provide the fuel that is required...not just dump fuel. The primaries are small (good signal sensing). Can you tell I like the Edelbrocks!

I attended a street rod gathering a couple of years back and noticed 8 of 10 of the cars were running the Edelbrocks. If you cannot get your hands on an Edelbrock, I would stay under 500 cfm. The 470 would run better on a 327 than a 650.

My 2 cents.