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cgrossl · 11-21-2003, 10:38 PM

I don't think that they are Vortecs. I believe that Vortecs usually have 906 as the last three digits of the casting number, but I could be wrong. www.mortec.com says that your heads are 1987-up 305 or 350 heads with 1.94" intake valves and 1.50" exhaust valves. If I'm not mistaken, Vortec heads came out in 96. But like I said, I could be wrong.

11-21-2003, 10:38 PM	#2
cgrossl Registered User Join Date: Oct 2003 Location: Lexington, KY Posts: 151	I don't think that they are Vortecs. I believe that Vortecs usually have 906 as the last three digits of the casting number, but I could be wrong. www.mortec.com says that your heads are 1987-up 305 or 350 heads with 1.94" intake valves and 1.50" exhaust valves. If I'm not mistaken, Vortec heads came out in 96. But like I said, I could be wrong.