Vortec Head Upgrade<<<<<<<<<<<< - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevjayfsd · 11-11-2002, 11:23 PM

Need to know what machine work is required to upgrade late model 350 vortec heads. Have purchased Z28 springs and retainers. Heads need to be good for up to 0.525" of lift.

bigjimzlll · 11-11-2002, 11:42 PM

I believe your best bet is the machine shop...the z28 springs a 1.25 diameter..same as the vortecs..they both are single springs..but the z springs will only work at .525 if they are installed at 1.7"..im not sure how they do that..I think it takes longer valves..not sure though..

Longhorn Man · 11-11-2002, 11:46 PM

I agree, go to a machine shop, and not just any shop either...vortecs are close to perfect out the box, it is very easy to screw them up.

70 longbed · 11-12-2002, 05:56 PM

I recently had an early set of vortechs done for my motor. I had to supply the machine shop with the cam information and let him know that I was going to put 1.6 roller tip rockers on. He did the calculations and put a stronger spring in for me.

By the way, I have decided not to use the vortechs and they can be had for $400. They have been totally gone through at the machine shop and have the stronger springs. Ready to install, with valve covers. Valve covers have not been cleaned up.

11-11-2002, 11:23 PM	#1
chevjayfsd Project 7dos Join Date: Aug 2001 Location: Abilene, Texas Posts: 876	Vortec Head Upgrade<<<<<<<<<<<< Need to know what machine work is required to upgrade late model 350 vortec heads. Have purchased Z28 springs and retainers. Heads need to be good for up to 0.525" of lift. __________________ 7DOS - 1972 C-10 350/350 Porterbuilt/Accuair 20x8.5/20x10 Ride Low or Die PSSST - Yes it's bagged. 7dos build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=610290

11-11-2002, 11:42 PM	#2
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	I believe your best bet is the machine shop...the z28 springs a 1.25 diameter..same as the vortecs..they both are single springs..but the z springs will only work at .525 if they are installed at 1.7"..im not sure how they do that..I think it takes longer valves..not sure though.. __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

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11-11-2002, 11:46 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I agree, go to a machine shop, and not just any shop either...vortecs are close to perfect out the box, it is very easy to screw them up.

11-12-2002, 05:56 PM	#4
70 longbed Senior Member Join Date: Oct 2002 Location: Sierra Vista, AZ Posts: 489	I recently had an early set of vortechs done for my motor. I had to supply the machine shop with the cam information and let him know that I was going to put 1.6 roller tip rockers on. He did the calculations and put a stronger spring in for me. By the way, I have decided not to use the vortechs and they can be had for $400. They have been totally gone through at the machine shop and have the stronger springs. Ready to install, with valve covers. Valve covers have not been cleaned up.



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