95 Vortec heads / 7004R - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WB72 · 07-08-2003, 05:41 PM

Are 1995 steel Vortecs any good? I can get a set rebuilt for $ 500 Canadian. Are there any good casting numbers that I should look for?

What are the valve sizes?

What is the Max Lift for the stock springs?

What year and model of 700R4 should I be looking for?

bigjimzlll · 07-08-2003, 06:11 PM

1996 was the first year of the good vortecs
10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber,
170cc intake port, 1.94"/1.5" valves
12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port

lukecp · 07-08-2003, 07:42 PM

Max lift is a debated issue....some sources say .450", others say .470"-480". Myself, i have no clue what the max lift is, but i would proably stay it safe and run about .450" or less.

For your 700R4, i would look for a '87 or newer model. In '87 they made alot of changes to the tranny, and beefed it up quite a bit. The older modles are supposed to be weaker and more finicky. They used the 700R4 up to '93 i think, and some models were called the 4L60. After '93, the tranny was converted to computer operation and became the 4L60E.

Good luck!

07-08-2003, 05:41 PM	#1
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	95 Vortec heads / 7004R Are 1995 steel Vortecs any good? I can get a set rebuilt for $ 500 Canadian. Are there any good casting numbers that I should look for? What are the valve sizes? What is the Max Lift for the stock springs? What year and model of 700R4 should I be looking for? __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA

07-08-2003, 06:11 PM	#2
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	1996 was the first year of the good vortecs 10239906...96-up...350.........."Vortec 5700", "L31", 64cc chamber, 170cc intake port, 1.94"/1.5" valves 12558062...98......350..........L31 Vortec, truck, 64cc chambers, 1.94/1.5, 170cc intake port __________________ 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

07-08-2003, 07:42 PM	#3
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Max lift is a debated issue....some sources say .450", others say .470"-480". Myself, i have no clue what the max lift is, but i would proably stay it safe and run about .450" or less. For your 700R4, i would look for a '87 or newer model. In '87 they made alot of changes to the tranny, and beefed it up quite a bit. The older modles are supposed to be weaker and more finicky. They used the 700R4 up to '93 i think, and some models were called the 4L60. After '93, the tranny was converted to computer operation and became the 4L60E. Good luck! __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

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