317 Heads, Worth it?

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Feb 1, 2005 | 08:49 PM

1jfuddle

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317 Heads, Worth it?

I am considering a set of aluminum truck heads. Casting 317 using the LS6 design. I've heard conflicting ideas on using these heads. What are your thoughts? If I don't do any work to them, what valve size do I want?
Also, will they work on a 98 block?

Last edited by 1jfuddle; Feb 1, 2005 at 09:08 PM.

Feb 1, 2005 | 09:15 PM

INVISIBLEZ

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Originally Posted by 1jfuddle

They're not worth it if you don't port them. You'd do better to go with a 241 casting head. 317's are for bigger 6.0 engines, unless milled and ported for a 346 c.i. engine. You would'nt have any compression, so you'd hurt yourself instead of help yourself.

Feb 1, 2005 | 09:24 PM

BrentB@TEA

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they also do not flow as well on the smaller 3.9 bore. Your best bet is a set of "TRUE" ported LS6 heads followed by ported 5.3 truck heads.

Feb 1, 2005 | 11:39 PM

Zedzag

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Brent, how well do 317 heads flow on the larger 4.0 bore ? Would a 6.0 see the same gains with a cam as a 5.7 does?

Feb 2, 2005 | 10:58 AM

1jfuddle

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As far as the flow, I was under the impression that they had the basic LS6 design as far as intake and exhaust with just a bigger combustion chamber. Is that wrong? If I had them milled, would that make it more worth it? I can get a STEAL on a set of these heads ($300), am I just dreaming that these would be worth it? Should I just spend my money on ported ls6 heads, or is the price good enough on these that I should do it?
BTW, it is a nitrous car and I plan on spraying a 200 shot.

Feb 2, 2005 | 01:12 PM

98Raptor

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Go with ported 5.3 heads.

Feb 2, 2005 | 08:18 PM

ktmrider

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From: Albuquerque, NM

Only real advantage to using them on your LS1 is to lower the compression for FI. Otherwise spend the money elsewhere. BTW, tho, awesome price on those #317's!

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