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317 heads for boost...Home Porting ?

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Old 03-02-2016, 09:21 AM
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Default 317 heads for boost...Home Porting ?

Curious on what you guys recommend for just doing a simple home port job? These are going on my boosted 370 build. Figured I have everything apart I could just clean the heads up easy enough. I am also in no real rush. I have done some searching around but figured I would still ask.
Old 03-02-2016, 01:10 PM
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I recommend you don't do it. Very few people truly have a knack for it. If you want horse around on a set of junk heads for the experience, that's different. By the time you buy what you need to do a not harmful job, you're halfway to sending them to AI or Livernois for proven results.
Old 03-02-2016, 01:28 PM
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Lol, I have thought about that as well.
Old 03-02-2016, 05:03 PM
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Let's be honest here - who here has ruined a set of heads on a home port job?

me
Old 03-02-2016, 06:54 PM
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Just turn up the boost instead lol. I made 900rwhp with stock 317s on a 370ci with only 18psi
Old 03-02-2016, 06:59 PM
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There is power to be had by just cleaning up the rocker stud, and working around the bowl area/against the valve guide. Not extremely time consuming, or difficult to do. Just need a nice aluminum die set and a die grinder.

Old 03-02-2016, 08:51 PM
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Originally Posted by jmm98LS1
Just turn up the boost instead lol. I made 900rwhp with stock 317s on a 370ci with only 18psi
Haha, true. What rods and pistons where you running? Compression? My goal is a street-able 800ish.
Old 03-02-2016, 08:52 PM
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Originally Posted by dckmn52
There is power to be had by just cleaning up the rocker stud, and working around the bowl area/against the valve guide. Not extremely time consuming, or difficult to do. Just need a nice aluminum die set and a die grinder.

You do that yourself? Does look good. My problem is I have zero experience in that and I have never watched anyone do it. Make it a bit scary to try.
Old 03-02-2016, 10:16 PM
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Originally Posted by Spade
Haha, true. What rods and pistons where you running? Compression? My goal is a street-able 800ish.
Cheap Scat I-beams and mahle pistons on a stock crank and main bolts. Compression is 10.3ish.
Old 03-02-2016, 10:19 PM
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Did you want your compression that high for street manners? Great numbers for a relatively cheaper build. That's exactly what I am shooting for with my procharger setup.
Old 03-03-2016, 06:11 AM
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Looks good? broke through to the water jacket!
Old 03-03-2016, 06:20 AM
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Originally Posted by Spade
Did you want your compression that high for street manners? Great numbers for a relatively cheaper build. That's exactly what I am shooting for with my procharger setup.
Yep and I run e85 so that helps too.
Old 03-03-2016, 12:04 PM
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Originally Posted by Spade
You do that yourself? Does look good. My problem is I have zero experience in that and I have never watched anyone do it. Make it a bit scary to try.
yes that was all me. My machine shop did the valvejob, shaved the valve tips and decked the head .005 when i was done.

lots of youtube how-tos on porting LS heads. It takes a lot of work to **** up a cylinder head completely.
Just need to remember that a little bit goes a long ways, especially on a boosted application.

Originally Posted by farmington
Looks good? broke through to the water jacket!
if youre referring to the hole you see in the runner, that is the rocker boss not the water jacket.
Every CNC LS head on the planet has a hole there, and is normal.



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