holley stumble? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**crossy** · 07-31-2009, 02:05 PM

Neighbors car.
scenario- 347 SBF engine, LX body w/5speed, 4.10 geras.
canfield heads, Air gap intake. Comp Hyd roller. new holley 650 DP. not the HP series.

car snaps when you first touch the pedal then stumbles and blue oil smoke ensues and a 'rich' smell is present all the time. I've already told hime that some out of box holleys are junk, but thought i would give some of guys a chance to chime in. engine holds 6" vacuum at idle. the carb is stock except for #45 power valves.
I already thought maybe too large of a squirter/jetting for the low velocity heads.
Yes, i already told him to put a Chevy engine in it many time over. :-)
crossy

Marv D · 07-31-2009, 05:43 PM

Lend him a good tuned, working 750 and see if he is convinced.
Kind of sounds to me like he is sucking oil into the PCV system . The blue smoke would trouble me!

**crossy** · 07-31-2009, 11:01 PM

Quote:

Originally Posted by Marv D

Lend him a good tuned, working 750 and see if he is convinced.
Kind of sounds to me like he is sucking oil into the PCV system . The blue smoke would trouble me!

blue smoke troubles me too for a fresh engine, but i'm not lending him my carb either.

marv, i recognize your truck, belated congrats on the Pinks win.

d3mon · 08-03-2009, 06:37 PM

I too would start with dropping the squirter # size by 3 and see how it reacts. This will allow for a slightly longer duration shot.

Schralper · 08-04-2009, 11:23 AM

6" @ idle? are you sure? what kinda cam? HUGE?
cuz I have a hard time w/ 6" vacuum
I'm running 234/244 flat tappet in a 350 and have more than that.
have you messed w/ carb already? if so set back to stock settings.
try 1.5 turns out on idle mixture screws to start, 800rpm idle speed.
if it's not 6", try 6.5 PV's, #28-31 squirters, 65 mains.
blue smoke = oil getting into intake somewhere
got good intake/head seal? I had a squished intake gasket @ 1 port and it wanted to suck in oil.
Also had an intake manifold w/ pinhole casting defect that introduced oil into system
what's the timing? 16-18deg initial?

Marv D · 08-04-2009, 12:04 PM

Thanks crossy, it was a blast... unexpected, but a blast.

I have to agree schralper is on to something. The backup motor for my Nova runs a Crower roller with 268/274 @ 0.050, and .675 lift. IT has over 6" of vacuum in a Holley Proram with a pair of side-by-side 4150's. I know them furds are wierd, but no hydraulic roller should be that low unless it's some exotic custom grind animal. I suspect something mechanical i.e. busted intake seal like mentioned. That would explain the blue oil smoke.

You could always make him a deal... Lend him your carb for 1 hour, and it it's the POS furd motor, he has to put put the bumpersticker on... you know the one...

Quote:

I'd rather push a Chevy then drive this POS furd one more inch

wouldn't that be fun

07-31-2009, 02:05 PM	#1
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	holley stumble? Neighbors car. scenario- 347 SBF engine, LX body w/5speed, 4.10 geras. canfield heads, Air gap intake. Comp Hyd roller. new holley 650 DP. not the HP series. car snaps when you first touch the pedal then stumbles and blue oil smoke ensues and a 'rich' smell is present all the time. I've already told hime that some out of box holleys are junk, but thought i would give some of guys a chance to chime in. engine holds 6" vacuum at idle. the carb is stock except for #45 power valves. I already thought maybe too large of a squirter/jetting for the low velocity heads. Yes, i already told him to put a Chevy engine in it many time over. :-) crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

08-04-2009, 11:23 AM	#5
Schralper Registered User Join Date: Oct 2005 Location: Orygun Posts: 169	Re: holley stumble? 6" @ idle? are you sure? what kinda cam? HUGE? cuz I have a hard time w/ 6" vacuum I'm running 234/244 flat tappet in a 350 and have more than that. have you messed w/ carb already? if so set back to stock settings. try 1.5 turns out on idle mixture screws to start, 800rpm idle speed. if it's not 6", try 6.5 PV's, #28-31 squirters, 65 mains. blue smoke = oil getting into intake somewhere got good intake/head seal? I had a squished intake gasket @ 1 port and it wanted to suck in oil. Also had an intake manifold w/ pinhole casting defect that introduced oil into system what's the timing? 16-18deg initial? __________________ http://www.cardomain.com/id/Schralper Last edited by Schralper; 08-04-2009 at 11:27 AM.

07-31-2009, 05:43 PM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: holley stumble? Lend him a good tuned, working 750 and see if he is convinced. Kind of sounds to me like he is sucking oil into the PCV system . The blue smoke would trouble me! __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

08-03-2009, 06:37 PM	#4
d3mon Registered User Join Date: Aug 2007 Location: Michigan Posts: 18	Re: holley stumble? I too would start with dropping the squirter # size by 3 and see how it reacts. This will allow for a slightly longer duration shot.



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