Is flycut needed
Thread Starter
TECH Apprentice
Joined: Feb 2009
Posts: 313
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From: Harlingen, Tx
Is flycut needed OK HERES A LIST OF CAM DO THEY ALL NEED A FLYCUT PISTON AND WITCH ONE WOULD YOU GO WITH AND WHY
Tsunami cam 235/240 .654/.609 111LSA
Ms4 cam 239/242 .649/.609 111LSA
texas giant cam 248/254 .615/.622
Trex cam 242/248 .608/.612 110LSA
Tsunami cam 235/240 .654/.609 111LSA
Ms4 cam 239/242 .649/.609 111LSA
texas giant cam 248/254 .615/.622
Trex cam 242/248 .608/.612 110LSA
need more info- what do you want out of your car?
Of those I would say none of them, as a cam sepecific to what you want will give you more power and only cost a little bit more.
Of those I would say none of them, as a cam sepecific to what you want will give you more power and only cost a little bit more.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Do they need flycutting to actualy rotate the motor? No (if the grind is correct)
Do they all have safe PTVC, well that is debatable.
What rule of thumb is "safe"?
A big majority of "big" cams have less than .080 intake and .100 exhaust.
100s if not thousands run less than that on the street.
I think the important part is to:
1- Know what your clearances are (meaning measure and do not take anyones word for it)
2- Degree your cam
3- Make sure you run the proper valvetrain for the cam you choose. (meaning make sure your valves are under control)
Basicaly, know what you are getting into, make the decision being fully aware of the risks.
After posting this, just a few threads down I came across this:
https://ls1tech.com/forums/11821957-post1.html
That pretty much says it all
Do they all have safe PTVC, well that is debatable.
What rule of thumb is "safe"?
A big majority of "big" cams have less than .080 intake and .100 exhaust.
100s if not thousands run less than that on the street.
I think the important part is to:
1- Know what your clearances are (meaning measure and do not take anyones word for it)
2- Degree your cam
3- Make sure you run the proper valvetrain for the cam you choose. (meaning make sure your valves are under control)
Basicaly, know what you are getting into, make the decision being fully aware of the risks.
After posting this, just a few threads down I came across this:
https://ls1tech.com/forums/11821957-post1.html
That pretty much says it all
Last edited by PREDATOR-Z; Jul 4, 2009 at 05:24 PM.
Thread Starter
TECH Apprentice
Joined: Feb 2009
Posts: 313
Likes: 0
From: Harlingen, Tx
so i hear from many people saying you have to fly cut the pistons and the other half so you dont. i have stock 853 heads but was thinking of going with other heads like patriot stage 3 243 heads or Tsp 2.5 243 heads would i need to fly cut the pistons any info will help........thanks
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
Mike, no offense man but which part did you not understand?
1- You need to measure PTV clearance (based on that you have to decide if you flycut or not)
I even gave you an exemple of what happens if you do not.
1- You need to measure PTV clearance (based on that you have to decide if you flycut or not)
I even gave you an exemple of what happens if you do not.
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From: Western Burbs of Detroit
Hey Mike, would you add this cam to your list for consideration? The allngn_c5 cam 239/243 .623/.623 113+3 available exclusively from Vengeance Racing !! I saw your list of big cams, so I thought you'd like to consider this one too. Good luck on your decision making. BTW this cam drives and idles like stock in my 402. Tuning is everything.
I say 3 of those 4 would be close, with Trex probaly being safest.
You have to look at duration as well as lift (and rocker ratio, size valve you are running, heads milled, heads angle milled, gasket thickness, piston out of teh hole, flat top or domed piston....am I missing anything?)
When you put in a cam, it is ALWAYS in your best interest to check PTV. If not, you run the risk of smacking a piston with a valve.
Only thing I can tell you is this:
If you know of someone firsthand that has the EXACT same combo you plan on running, and they were clear, you are PROBALY (but not 100%) OK. Cause, how do you know that hey have the same gasket thickness or who knows what else is different between your motor and theirs.
Is that being cautious? Yes. Why? If you have ever seen a PTV problem, you would be too.
You have to look at duration as well as lift (and rocker ratio, size valve you are running, heads milled, heads angle milled, gasket thickness, piston out of teh hole, flat top or domed piston....am I missing anything?
)When you put in a cam, it is ALWAYS in your best interest to check PTV. If not, you run the risk of smacking a piston with a valve.
Only thing I can tell you is this:
If you know of someone firsthand that has the EXACT same combo you plan on running, and they were clear, you are PROBALY (but not 100%) OK. Cause, how do you know that hey have the same gasket thickness or who knows what else is different between your motor and theirs.
Is that being cautious? Yes. Why? If you have ever seen a PTV problem, you would be too.
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TECH Senior Member
iTrader: (3)
Joined: Apr 2006
Posts: 6,524
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From: Western Burbs of Detroit
Good point that all motors are different. One motor has zero decking, one has negative decking, and one has positive decking. I hate to hear that your pistons come out the hole a little bit and that you didn't check for clearance. That could be disasterous.
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The other thing that did not get posted is, the heads that you are going to run are they going to be milled and how much. If they get milled lets say .0030 then you will probably more than likely, thinking it very hard YES.
Better to side in the side of safety than anything else. Like I say it is your car, you are the one incurring all cost when the car breaks down, and just because you followed advice doesn't mean you can hold any one but yourself responsible,
Better to side in the side of safety than anything else. Like I say it is your car, you are the one incurring all cost when the car breaks down, and just because you followed advice doesn't mean you can hold any one but yourself responsible,
