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heads for 350 vortec

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Old 03-22-2011, 09:59 PM
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Originally Posted by laoutlaw
What size heads would be good for a stock 350 with a full exhaust and no cats and a cai. I talked to a guy a patriot and he said that the stock vortec heads flow 180cc. He said the biggest he would go was 190cc. What do you guys think. I will have a stock cam and I want to put 1.6 roller rockers in the heads also.
Stock vortec runners are 170cc

Patriot Vortecs are 180cc

If I remember right there was one company making a high flow spider, not sure if they still do. And no I am not talking about the Multec II injectors.
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Old 03-22-2011, 10:08 PM
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Wester's Garage has a flow matched spider assembly for the 1996 - 2000 Vortec 5.0 & 5.7L CPI trucks, called the Black Widow and is said to flow 35lbs/hr (stock is 22 lbs/hr) and support up to 440 crank hp.
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Old 03-23-2011, 06:01 PM
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Originally Posted by 1Bear
Wester's Garage has a flow matched spider assembly for the 1996 - 2000 Vortec 5.0 & 5.7L CPI trucks, called the Black Widow and is said to flow 35lbs/hr (stock is 22 lbs/hr) and support up to 440 crank hp.

That was it! I though the stock poppets are 19lb/hr?
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Old 03-23-2011, 06:43 PM
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Originally Posted by offroadrider12
That was it! I though the stock poppets are 19lb/hr?
They may be, as I don’t recall and was in this case I was just regurgitating what they were advertising.
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Old 03-23-2011, 09:09 PM
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hmm. looks like high flow poppets, not multec II style unfortunately. Guess it would still work ok. I've got 220K on the stock poppets on my 98C1500.
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