Vaccum Secondary Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 05-04-2004, 01:27 PM

On the holly I am looking to change the Vaccum Secondary springs.

On a heavy truck like mine I am looking for more throttle response and low end power would it be better to have them come in early or late?

TIMSPEED · 05-04-2004, 02:11 PM

I THINK you want a lighter spring..In my case, I'm going with a heavier spring, because I have a LOT of vacuum, and a semi-light truck.

76bonanza · 05-04-2004, 05:10 PM

I have about 21 hg how high is your vaccum?

05-04-2004, 01:27 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Vaccum Secondary Question On the holly I am looking to change the Vaccum Secondary springs. On a heavy truck like mine I am looking for more throttle response and low end power would it be better to have them come in early or late? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-04-2004, 02:11 PM	#2
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	I THINK you want a lighter spring..In my case, I'm going with a heavier spring, because I have a LOT of vacuum, and a semi-light truck. __________________ I have a few cars... See Them Here

05-04-2004, 05:10 PM	#3
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	I have about 21 hg how high is your vaccum? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

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