Thread: Vortec heads

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I don't have the numbers, but quite sure the 441's will outflow and outperform the 906's.... What are the valve sizes in the 441's? There's some really sharp SBC guys (I'm not one) on here, I'm sure they can give you some good advice on how to get a bit more out of them without wrapping up a bunch of $$$$$ in them!!!!

Pictures of the Avanti, PLEASE!!!!!!!!!

Originally Posted by Dave Severson

I don't have the numbers, but quite sure the 441's will outflow and outperform the 906's.... What are the valve sizes in the 441's? There's some really sharp SBC guys (I'm not one) on here, I'm sure they can give you some good advice on how to get a bit more out of them without wrapping up a bunch of $$$$$ in them!!!!

Pictures of the Avanti, PLEASE!!!!!!!!!

Hey Dave,
Thanks for your reply. Here are a couple of pics, I hope. I'm new here and not sure how things work.

Originally Posted by Dave Severson

I don't have the numbers, but quite sure the 441's will outflow and outperform the 906's.... What are the valve sizes in the 441's? There's some really sharp SBC guys (I'm not one) on here, I'm sure they can give you some good advice on how to get a bit more out of them without wrapping up a bunch of $$$$$ in them!!!!

Pictures of the Avanti, PLEASE!!!!!!!!!

Hey Dave,
Thanks for your reply. Here are a couple of pics, I hope. I'm new here and not sure how things work.

Originally Posted by Dave Severson

I don't have the numbers, but quite sure the 441's will outflow and outperform the 906's....

Ummmm, not quite Dave. The L31 heads are the best flowing production cast iron heads that Chevrolet Motor Div ever produced. The 441's don't even come close. Here's a decent tutorial.....
http://www.crankshaftcoalition.com/w..._cylinder_head
I've been told that the runners were patterned after the aluminum LT1 heads, but cast in iron instead of aluminum.

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