g5x3
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Hurley has Stage 2 patriots:
1- it has bigger valves
2- it is cleaned at deck at least .003>.005 so less deck height than stock.
X3 on a 112+4 has .07 intake clearance on most stock LS1/LS6 so my advice still stands, measure PTV clearance, if less than .050, consider a small intake flycut to avoid expensive consequences.
1- it has bigger valves
2- it is cleaned at deck at least .003>.005 so less deck height than stock.
X3 on a 112+4 has .07 intake clearance on most stock LS1/LS6 so my advice still stands, measure PTV clearance, if less than .050, consider a small intake flycut to avoid expensive consequences.
Here is the thread I always refer people to...
Interestingly, I found this thread from almost 3 years ago while looking for that quote.
Hi guys, there is 220 thou of valve drop with a milled, 59cc AFR and .040 cometics. There is 200 thou of valve drop on a stock motor.
Any X series( G5, X1, X2, X3, X4, 111/112/114 excluding the xX ( which in most cases, thats install only here at the shop) will fit on a stock engine, 112 or 114. The X3 110 will not clear stock heads, but it will be close on the AFRs. You gain quite a bit of PTV with AFRs. If you are not sure, and want to know what your setup came in at, check it.
Any X series( G5, X1, X2, X3, X4, 111/112/114 excluding the xX ( which in most cases, thats install only here at the shop) will fit on a stock engine, 112 or 114. The X3 110 will not clear stock heads, but it will be close on the AFRs. You gain quite a bit of PTV with AFRs. If you are not sure, and want to know what your setup came in at, check it.
According to what I learned recently (something new everyday 
) a AFR 205 milled .030 with .040 Cometic has .020>.025 more valve drop room than a stock head.
As per Louis at LGM a 234/242 114 fits on that combo with no issues (well slightly below the rule of thumb safety margins) but fits. (.070/.100-.110).
So 232/234 should have lots of room on a .020 mill and stock gaskets.
This was my shocker for the day 
) a AFR 205 milled .030 with .040 Cometic has .020>.025 more valve drop room than a stock head.As per Louis at LGM a 234/242 114 fits on that combo with no issues (well slightly below the rule of thumb safety margins) but fits. (.070/.100-.110).
So 232/234 should have lots of room on a .020 mill and stock gaskets.
Originally Posted by LOUIS@LGM
The G5x3 112 fits on a stock headed car. Stock heads have 200 thousandths of valve drop. A milled, 59cc AFR with .040 Cometics has 220-225 thousandths of valve drop. I cut 80 out of the piston I have 300-310 drop. No joke.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Everyone talks about valve drop but never puts a true value of the actual PTV clearance BTDC & ATDC.
You hear, "Yeah it will clear", the true question therefore becomes, By how much?
Louis's answer in that thread is hovering around the issue, one of his "star" setups at the time was AFR 205s and X3 on a 59cc chamber. I've seen quite a few "piston smillies" from that combo without flycutting (112 LSA).
We could talk about this till end of time, you and I know, it is best to measure PTVC than relying on any info as gospel (including mine
) 
It would be helpfull if someone from the LG shop jumped in and gave us the measured clearance on many of there AFR set ups with the G5X series
I know there is a differance from set up to set up, but something like this:
the X2 cam on a 114 with GM stock gaskets and AFR heads milled .030 have shown this much clearance on the intake and this much on the exhaust.
the X3 cam on a 114 with GM stock gaskets and AFR heads milled .020 have shown this much clearance on the intake and this much on the exhaust.
the X2 cam on a 112 with GM stock gaskets and AFR heads milled .030 have shown this much clearance on the intake and this much on the exhaust.
the X3 cam on a 114 with cometic .040 gaskets and AFR heads milled .030 have shown this much clearance on the intake and this much on the exhaust.
them a cavaet at the end saying measure just to be sure
They do these set ups everyday and im sure they measure.
I know there is a differance from set up to set up, but something like this:
the X2 cam on a 114 with GM stock gaskets and AFR heads milled .030 have shown this much clearance on the intake and this much on the exhaust.
the X3 cam on a 114 with GM stock gaskets and AFR heads milled .020 have shown this much clearance on the intake and this much on the exhaust.
the X2 cam on a 112 with GM stock gaskets and AFR heads milled .030 have shown this much clearance on the intake and this much on the exhaust.
the X3 cam on a 114 with cometic .040 gaskets and AFR heads milled .030 have shown this much clearance on the intake and this much on the exhaust.
them a cavaet at the end saying measure just to be sure
They do these set ups everyday and im sure they measure.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
It has nothing to do with number of posts but more about the fact that he has never measured PTV himself on such a cam otherwise he would know better.
Bottom line, nothing can be taken for granted, PTV should always be measured, cam always degreed, pushrod length always measured.
That is the only *perfect* and *right* way to do an install to be aware of *YOUR* setup as every motor is different from one to the other.
Take the piston deck height on stock engines, they cam vary by as much a .005 from one to the other. That is enough to have piston contact (when hot) on cams such as T-REX (exemple) or similar.
Bottom line, nothing can be taken for granted, PTV should always be measured, cam always degreed, pushrod length always measured.
That is the only *perfect* and *right* way to do an install to be aware of *YOUR* setup as every motor is different from one to the other.
Take the piston deck height on stock engines, they cam vary by as much a .005 from one to the other. That is enough to have piston contact (when hot) on cams such as T-REX (exemple) or similar.
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