Vacuum Secondary spring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

red86chevy · 08-29-2005, 09:23 PM

I have a mild 350 with sportsman II heads (64cc) and a comp 270h cam, and a 3.73 gear. It has a holley 600 vacuum secondary carb on top of it. A while back I installed the white (lightest) spring.(it had the black one in it...heaviest) But like for ex if I pull it down into 1st and tach it up to around 35000 and hit it its like it has a pretty good hesitation until it really gets turning. It doesn't really do it off Idle to WOT just when I do it this way. Do you think the spring is too light. I don't remember how it reacted with the heavy spring in it. What do you guys think.

Also I remember a check valve of somesort in there somewhere. Where is it? and will it fall out when I take off the secondary diaphram housing?

Thanks
Jeremy

86 GMG · 08-30-2005, 09:17 AM

yes the little ball will fall out if not care full holley has a quick change that allows you to remove a cap on top and change spring its a lot easier and faster i think mine that i bought was 15.00 at a parts house

08-29-2005, 09:23 PM	#1
red86chevy Registered User Join Date: Jun 2005 Location: sc Posts: 77	Vacuum Secondary spring I have a mild 350 with sportsman II heads (64cc) and a comp 270h cam, and a 3.73 gear. It has a holley 600 vacuum secondary carb on top of it. A while back I installed the white (lightest) spring.(it had the black one in it...heaviest) But like for ex if I pull it down into 1st and tach it up to around 35000 and hit it its like it has a pretty good hesitation until it really gets turning. It doesn't really do it off Idle to WOT just when I do it this way. Do you think the spring is too light. I don't remember how it reacted with the heavy spring in it. What do you guys think. Also I remember a check valve of somesort in there somewhere. Where is it? and will it fall out when I take off the secondary diaphram housing? Thanks Jeremy __________________ 86 c-10 383 w/ sportsman II heads comp 286h cam Edlbrock RPM Performer intake Holley 750 th350 w/2400 stall 3.73 gears with powertrax No-Slip posi unit. Just broken in good. Will get a 1/4 time this week.

08-30-2005, 09:17 AM	#2
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	yes the little ball will fall out if not care full holley has a quick change that allows you to remove a cap on top and change spring its a lot easier and faster i think mine that i bought was 15.00 at a parts house __________________ square body trucks an addiction or an investment either way they consume all my extra time and money



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