Milling Casting #317 heads
04-12-2004, 02:33 PM
#1
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Milling Casting #317 heads I was wondering if you could mill down a set of 317 castings down so you get stock compression or more out of them without making them to thin. I know they flow as good as a set of ls6's but dont have the compression. Thanks alot 
03-18-2010, 03:56 PM
#4
I would never do more than .035 of any given head's deck. Reason is that you will weaken the deck and make it easier for any type of valve train failure to include cracking the deck and blowing those bad boys off your block specially if you are doing some type of power adder (Nitrous) or FI.
You can get stock compression with the 317 heads easily. I would not though try getting anything more than 10.5:1 out of them if that much. The 317 are great for FI if your doing FI on a budget. The 317s have a very close stock flow as 243s/799s so I really do not understand why you want to use these heads if not for FI.
You can get stock compression with the 317 heads easily. I would not though try getting anything more than 10.5:1 out of them if that much. The 317 are great for FI if your doing FI on a budget. The 317s have a very close stock flow as 243s/799s so I really do not understand why you want to use these heads if not for FI.
03-18-2010, 04:09 PM
#5
I would never do more than .035 of any given head's deck. Reason is that you will weaken the deck and make it easier for any type of valve train failure to include cracking the deck and blowing those bad boys off your block specially if you are doing some type of power adder (Nitrous) or FI.
You can get stock compression with the 317 heads easily. I would not though try getting anything more than 10.5:1 out of them if that much. The 317 are great for FI if your doing FI on a budget. The 317s have a very close stock flow as 243s/799s so I really do not understand why you want to use these heads if not for FI.
You can get stock compression with the 317 heads easily. I would not though try getting anything more than 10.5:1 out of them if that much. The 317 are great for FI if your doing FI on a budget. The 317s have a very close stock flow as 243s/799s so I really do not understand why you want to use these heads if not for FI.
03-18-2010, 04:54 PM
#6
The second thing that I would do is run the LS6 valves to give you better control over the rpm range and more clearance for a big cam.
The third thing is with the LS6 valves and stock rockers(do the trunnion up grade) you will have a very light yet solid valve train.
Good luck.
03-18-2010, 06:40 PM
#7
[QUOTE=02*C5;13052059]I would seriously do either 799s/243s. There is a lot less work you have to put into them for what you are looking for. If they are not in the budget then do what you can with those 317s but again my preference would be the prior mentioned. If you are at 10.3:1 with 70Cc chambers you will easily be at 11.5:1 with the stock chambers, & MLS gaskets with the 243s/799s and you will need only do a stage 1 by any one shop (ie TEA, AI etc.)]
thats the thing i dont want to do. go over 11.1.1 i just want to be exactly there or no less than 10.8.1. thats why i dont want to use 243s. 317s flow just the same and i just want to mill them to get my desired cr until i can later have them TEA ported or till i can just buy PRC stg 2.5 317s.
thats the thing i dont want to do. go over 11.1.1 i just want to be exactly there or no less than 10.8.1. thats why i dont want to use 243s. 317s flow just the same and i just want to mill them to get my desired cr until i can later have them TEA ported or till i can just buy PRC stg 2.5 317s.
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03-18-2010, 07:58 PM
#9
Roger got it now we are in the same boat. Call TEA or AI talk to them and get their opinion on what would be a good mill and chamber work to get you to your desired CR. They are the expert and they will steer you in the right direction. Again though like I said I would not do more than .035 off the deck.
