need help with VORTEC heads........... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RED71CHEVY · 06-10-2004, 12:56 PM

i have a pair of vortec heads casting# 10239906, and the valve guides have been cut down .150ths for more cam lift. the question is how much cam lift can i run , i want to use a ZZ4 cam @.05 -i.474,e.510,dur i208,e221 lobe sep112.

will this cam work, if not what else shold i do ......any sugestions?

Blazer1970 · 06-10-2004, 05:21 PM

That cam should work no problem.

RED71CHEVY · 06-11-2004, 11:40 AM

Thanks For The Reply.................anyone Else Have Any Input Or Thought On This Matter.

Stroker · 06-11-2004, 12:30 PM

What valve springs are you planning to use?

RED71CHEVY · 06-11-2004, 02:32 PM

I Was Going To Run The Stock Spring, Will It Work?
If Not What Spring Has The Same Dim's As The Vortec Stock Spring But Is Tall Enough And Stiff Enough For That Lift ".510"?
All Help Welcomed.

Stroker · 06-14-2004, 12:20 PM

No the stock spring won't work with the zz4 cam. The stock vortech springs are only good for a mild cam with .470 lift max and thats pushing it a bit IMO. I think you can use the factory LT-4 springs and retainers on the vortech heads and have enough clearance for the zz4 cam. Maybe someone else knows for sure.

71Rat · 06-14-2004, 08:07 PM

i might be wrong but an LT4 engine might have the right valve springs that your looking for... i have vortec heads and i have a .510 lift cam but i forget what springs i used.... i know they were comp cams springs though...... truck has some life now!!

Rat

jimfulco · 06-15-2004, 11:26 PM

ZZ4 & LT4 use the same 1.32" OD valve spring. If you use them, don't buy them singly for $4 each. GM sells a set of 16 for ~$35 under pn 12495494. Comp makes a cutter for enlarging the spring seats if necessary.

RED71CHEVY · 06-25-2004, 08:50 PM

rat<

did you have the guides cut or did you just swap the springs in your garage(or driveway).

06-10-2004, 12:56 PM	#1
RED71CHEVY Registered User Join Date: Dec 1999 Location: LEXINGTON,SC,USA Posts: 208	need help with VORTEC heads........... i have a pair of vortec heads casting# 10239906, and the valve guides have been cut down .150ths for more cam lift. the question is how much cam lift can i run , i want to use a ZZ4 cam @.05 -i.474,e.510,dur i208,e221 lobe sep112. will this cam work, if not what else shold i do ......any sugestions? __________________ TIM '71 CUSTOM C-10 torch red ,350 roller GM crate,3.73 GEARS, REAR 4"DROP SPRING, FRONT 2.5" DROP SPINDLE-1.5"lower spring, FRONT=17x8(4.5bs) W/265-60-17, BACK=17x9.5 (5bs)W/285-60-17, Vintage Air Sure Fit AC------NEVER ENDING PROJECT!!

06-10-2004, 05:21 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	That cam should work no problem. __________________ Tim

06-11-2004, 11:40 AM	#3
RED71CHEVY Registered User Join Date: Dec 1999 Location: LEXINGTON,SC,USA Posts: 208	Thanks For The Reply.................anyone Else Have Any Input Or Thought On This Matter. __________________ TIM '71 CUSTOM C-10 torch red ,350 roller GM crate,3.73 GEARS, REAR 4"DROP SPRING, FRONT 2.5" DROP SPINDLE-1.5"lower spring, FRONT=17x8(4.5bs) W/265-60-17, BACK=17x9.5 (5bs)W/285-60-17, Vintage Air Sure Fit AC------NEVER ENDING PROJECT!!

06-11-2004, 12:30 PM	#4
Stroker Registered User Join Date: Mar 2001 Location: Moore, Ok Posts: 1,149	What valve springs are you planning to use? __________________ 72 SWB parts and pieces Oklahoma

06-11-2004, 02:32 PM	#5
RED71CHEVY Registered User Join Date: Dec 1999 Location: LEXINGTON,SC,USA Posts: 208	I Was Going To Run The Stock Spring, Will It Work? If Not What Spring Has The Same Dim's As The Vortec Stock Spring But Is Tall Enough And Stiff Enough For That Lift ".510"? All Help Welcomed. __________________ TIM '71 CUSTOM C-10 torch red ,350 roller GM crate,3.73 GEARS, REAR 4"DROP SPRING, FRONT 2.5" DROP SPINDLE-1.5"lower spring, FRONT=17x8(4.5bs) W/265-60-17, BACK=17x9.5 (5bs)W/285-60-17, Vintage Air Sure Fit AC------NEVER ENDING PROJECT!!

06-14-2004, 12:20 PM	#6
Stroker Registered User Join Date: Mar 2001 Location: Moore, Ok Posts: 1,149	No the stock spring won't work with the zz4 cam. The stock vortech springs are only good for a mild cam with .470 lift max and thats pushing it a bit IMO. I think you can use the factory LT-4 springs and retainers on the vortech heads and have enough clearance for the zz4 cam. Maybe someone else knows for sure. __________________ 72 SWB parts and pieces Oklahoma Last edited by Stroker; 06-14-2004 at 05:57 PM.

06-14-2004, 08:07 PM	#7
71Rat ran out of money Join Date: Apr 2003 Location: northern, NJ Posts: 925	i might be wrong but an LT4 engine might have the right valve springs that your looking for... i have vortec heads and i have a .510 lift cam but i forget what springs i used.... i know they were comp cams springs though...... truck has some life now!! Rat __________________ Modify everything, leave nothing alone!~

06-15-2004, 11:26 PM	#8
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	ZZ4 & LT4 use the same 1.32" OD valve spring. If you use them, don't buy them singly for $4 each. GM sells a set of 16 for ~$35 under pn 12495494. Comp makes a cutter for enlarging the spring seats if necessary.

06-25-2004, 08:50 PM	#9
RED71CHEVY Registered User Join Date: Dec 1999 Location: LEXINGTON,SC,USA Posts: 208	rat< did you have the guides cut or did you just swap the springs in your garage(or driveway). __________________ TIM '71 CUSTOM C-10 torch red ,350 roller GM crate,3.73 GEARS, REAR 4"DROP SPRING, FRONT 2.5" DROP SPINDLE-1.5"lower spring, FRONT=17x8(4.5bs) W/265-60-17, BACK=17x9.5 (5bs)W/285-60-17, Vintage Air Sure Fit AC------NEVER ENDING PROJECT!!



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