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Jun 7, 2010 | 12:55 PM

ColossalCamaro

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From: Ocean Springs, MS

317 heads

I've read a lot about people using 317 heads on Procharged set ups. What is the reason for this? I read they flow better than the 241's but I thought the 241's flowed pretty well. I thought that was one reason the 01 and 02 Fbodies were so strong.

Jun 7, 2010 | 12:59 PM

Ryans99ls1

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From: OH & MI

they lower your combustion ratio and are basically the 243 head design with bigger cc's

Jun 7, 2010 | 02:04 PM

conan

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From: Back in the Burg

What he said ^^^ The 317's have a 72cc combustion chamber and the 241's have a 66 cc combustion chamber.

Jun 7, 2010 | 02:37 PM

ColossalCamaro

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From: Ocean Springs, MS

What are real world gains?

Jun 7, 2010 | 02:50 PM

conan

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From: Back in the Burg

The lower the compression the more detonation control you have when you start upping the boost.

Jun 7, 2010 | 04:15 PM

87silverbullet

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From: Slidell,LA

Quote:

Originally Posted by ColossalCamaro

What are real world gains?

Ask Hellbents on here. He has a GTO that has dynoed 800+ rwhp on a stock motor with 317 heads. 98z28Cobrakiller on here went 10.08 in a full weight f-body with a stock untouched long-block with 317 heads.

Jun 7, 2010 | 04:19 PM

boosteds10

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Not trying to jack the tread by any means, But what is the compression ratio of a 5.3 with 317s?

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Jun 7, 2010 | 08:00 PM

sparkwirez06

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From: brunswick, ohio

any valve interference with the small bore?

Jun 8, 2010 | 11:02 AM

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slow67

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From: DFW

Quote:

Originally Posted by sparkwirez06

any valve interference with the small bore?

Not unless you try and put a donkey-dick cam in there......many guys around here running 5.3s with 317s. Have to use the 6.0 head gasket as the chamber is bigger than the 5.3 head gasket.

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317 heads

317 heads

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