and give you a .020 spread. 
Will I need to flycut?
Will I need to flycut? I have the g5x3 cam 234/242 610/615" 114 lsa and wanted to know if I can put on patriot ls6 heads that are 59cc. The part number is #2029 on their website. Just wanted to know if they will clear or do I have to flycut?
.080 minimum and you will only know once you get your heads and measure. You'll get different people telling you the different clearances (some Sponsors, Specially Vendors) they have worked with but those are guys who have money to spare if something goes wrong. Try and contact XtraCajunSS he is a straight shooter and will tell you exactly where you need to be at.
Last edited by 02*C5; Nov 21, 2009 at 02:12 PM.
yes you need to flycut.do it right the 1st time.stock heads your cuttin it real close like me with the trex cam.but thats a whole different view from me.
take Pred Z advice on this one.good luck.
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With that cam you are going to need full 64CC chambers and very little no more than .005 or no milling at all. Get some stock GM head gaskets. Still you need to measure no matter what.
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Might I ask how you come up with this? Or are you saying 64cc because thats a stock unmilled head? Dont most if not all CnC programs port out the combustion chamber and then mill to get the correct size chamber?
CNC machine removes material from the combustion chambers in order to unshroud the valves. This changes the chamber volume dramatically.It takes about .005 of deck milling to take out about a cc of volume but it takes .006 of deck milling to come down 1CC of volume in the LS heads. Most times you will have a combination of CNC of the chamber and Milling of the deck to get to the desired chamber CC. I hope this clears it up a little if not then some one will help me out. That's why I mentioned not to do anything to the heads or very little. You want to keep those valves as far away from the cam as possible.
Why such a big cam brother? This is Jessie P from Norcal. You should take a look at the Torquer V3. I'm having great success with my Patriot heads and that cam combo. Put down good power too for a 4k stalled stock 4L and run pretty good numbers for a stock drive train.
An X3 is not a "big" cam it's not small either but by no means a monster. If you call LG's tech support they can help you figure out how much you need to flycut via valve drop figures. They will need to know your combustion chamber volume,valve size (I cant remember what else they need to know). They can help you determine safe PTV with the valve drop method I have used this method on my LS1 with the X3 and again with the X4 swap and yet again with the X4 in the current LS2 build. I've spun both motors to 7200 rpm's no issues.
An X3 is not a "big" cam it's not small either but by no means a monster. If you call LG's tech support they can help you figure out how much you need to flycut via valve drop figures. They will need to know your combustion chamber volume,valve size (I cant remember what else they need to know). They can help you determine safe PTV with the valve drop method I have used this method on my LS1 with the X3 and again with the X4 swap and yet again with the X4 in the current LS2 build. I've spun both motors to 7200 rpm's no issues.
