Holley 500's here - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JAKES 68GMC · 04-11-2006, 04:42 PM

Just got my shiny Holley 500 cfm 2-barrel today. Suppose the V6 will run with butterflies that size??

krue · 04-11-2006, 09:30 PM

**Bob B.** · 04-11-2006, 09:55 PM

I bought one of those for my 351. Can't wait to try it!

thecatseye66 · 04-12-2006, 01:10 AM

So these carbs make good choices for six-cylinder engines?

I have the original one still in the '68 396 truck. It only has 45k miles on it. I rebuilt it last year and it works great--just not enough go juice. Manual choke/throttle is a PITA for anyone without any patience and it doesn't really deliver enough volume for the engine. BB + 2-barrell = Not a good combo from the boys at GM IMHO. Once it warms up and the vacuum seems solid everything works pretty well, it just can't accelerate very fast while towing a heavy load.
It is coming off one of the next few weekends for a stock cast iron high-rise intake and a new q-jet with a coil choke. Then the intake is getting a paint job and I'm strapping them both to the wall up high in the garage...

**Bob B.** · 04-12-2006, 01:32 AM

Wow, you have a '68 396 with a 2 bbl.? Those are supposed to be super rare. I know the truck 396 2 bbl. used the Holley, while the car version had a Rochester 2 bbl..

thecatseye66 · 04-12-2006, 11:09 AM

Quote:

Originally Posted by Bob B.

Wow, you have a '68 396 with a 2 bbl.? Those are supposed to be super rare. I know the truck 396 2 bbl. used the Holley, while the car version had a Rochester 2 bbl..

Yep, it only has 45,000 miles on it now. It is the pic in my avatar. Once it gets warmed up it deisels (run-on) when you shut it off and I've tried everything to get it to quit. An older guy at a swap meet was looking at it and he said that the two-barrel setup has probably contributed to a lot of carbon buildup in the heads and that the carbon is most likely still glowing-hot after I shut the engine off and the carbon deposits are acting like spark-plugs and igniting fuel that is still getting sucked into the intake from the engine vacuum.
I don't know if that is true, but I'm wondering how it will act with the new q-jet on it.
Here's a couple pics:

04-11-2006, 04:42 PM	#1
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,211	Holley 500's here Just got my shiny Holley 500 cfm 2-barrel today. Suppose the V6 will run with butterflies that size?? Attached Images

04-11-2006, 09:30 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Holley 500's here __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

04-11-2006, 09:55 PM	#3
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,363	Re: Holley 500's here I bought one of those for my 351. Can't wait to try it! __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

04-12-2006, 01:10 AM	#4
thecatseye66 '68 C-20 396 CST CC Join Date: Mar 2005 Location: Spokane, WA Posts: 454	Re: Holley 500's here So these carbs make good choices for six-cylinder engines? I have the original one still in the '68 396 truck. It only has 45k miles on it. I rebuilt it last year and it works great--just not enough go juice. Manual choke/throttle is a PITA for anyone without any patience and it doesn't really deliver enough volume for the engine. BB + 2-barrell = Not a good combo from the boys at GM IMHO. Once it warms up and the vacuum seems solid everything works pretty well, it just can't accelerate very fast while towing a heavy load. It is coming off one of the next few weekends for a stock cast iron high-rise intake and a new q-jet with a coil choke. Then the intake is getting a paint job and I'm strapping them both to the wall up high in the garage... __________________ 68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES 01 Jetta Turbo Daily Driver 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico

04-12-2006, 01:32 AM	#5
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,363	Re: Holley 500's here Wow, you have a '68 396 with a 2 bbl.? Those are supposed to be super rare. I know the truck 396 2 bbl. used the Holley, while the car version had a Rochester 2 bbl.. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

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