8banger

iTrader: (16)

Hey everyone. I installed my custom cam today. It's a fairly large cam on a tight LSA, and with my .040" head gaskets I was scared about P-to-V clearance. I threw the cam in, bolted up the rockers, and spun it. No problems at all...spun freely, all valves opened and closed, and no contact between piston and valve at all. I couldn't be happier about it right now.

HavATampa

iTrader: (49)

Heh....is that it? You spin the engine over and no contact and you're safe? You aren't concerned with how much clearance you actually have? How much duration is the cam and what heads are you using?

RoastEmSS

u gonna give out the cam specs?

Ferocity02

iTrader: (60)

You might have clearance now when you turn over the motor at 0.7rpm, but when you get up to 6500rpm it's a whole different story. If you are worried about PV clearance, you need to put some clay on the top of your pistons and see what clearance you have.

tbojbob

Sounds like you have the first two basic obstacles out of the way, it physically fit and, there isn't any mechanical interference @ 1 or 2 rpm........

Azrael

iTrader: (10)

You need to clay it as these guys are saying, otherwise you may run into PtV issues at higher RPMs. The added momentum may cause you to dump a valve into a piston and then into the cylinder and it won't be pretty...

8banger

iTrader: (16)

Wow...not harsh at all. It was a preliminary thing. But the cam's not that huge...just a G5X3 on a 110, stock 853's with a .040" gasket.

Azrael

iTrader: (10)

Then it should be fine. If the cam worked with stock heads and your new heads have not been milled then why the .040 gasket? Did you use longer aftermarket valves? You will be increasing the combustion camber CC/losing compression... I thought the G5X3 was designed for stock heads?

I am not sure why you would be worried about PtV?

Now in my case I have Stage II heads milled .020... So I just presumed you had ported/milled heads...

PREDATOR-Z

G5X3 on a 110 with .040 gasket
I would remove and flycut if I were you.
The 112 with stock gasket is allready really tight. I mean tight.
If you don't believe me call LOU at LGM and ask him. (unless you have a clone), but you could ask him though.

GuitsBoy

iTrader: (4)

put some checker springs and a dial indicator on there and see how much you really have. If youve got .080 you could take the risk, but much less than that and your almost guaranteed youll hit once you take it up in the RPMs.

8banger

iTrader: (16)

Screw it...if I have to take the heads off, I'm just getting some LS6's.

GuitsBoy

iTrader: (4)

You dont have to take the heads off to use checker springs and a dial indicator... I actually prefer this meathod to clay, as long as you do it properly.

8banger

iTrader: (16)

Maybe I should just get the heads since Patriot has them so cheap, flycut the pistons, and that way be safe while making more power.

ilirw325

iTrader: (3)

Turning the engine over by hand with a hydraulic lifter might not be a good test because it will bleed down and give a false reading. This would lead you to believe you have no PTV issues when you actually might. You need a test spring, solid lifter, and possibly a adjustable pushrod. just my $.02

8banger

iTrader: (16)

Maybe I'm naive but I just really don't see how a 234/242 on a 110 could have clearance issues when a 244/250 on a 110 (T-Rex) doesn't...

orangeapeel

iTrader: (18)

I think he was talking about the fly-cut. But I agree with you here.

orangeapeel

iTrader: (18)

Why does everyone keep rounding up the duration on the TRex?

moeZ28

iTrader: (7)

Yeah my TREX is 243.5/249.1 .613/.619 110 LSA, why would a G5X3 have trouble on a 110? its on XER lobes, not even as big as LSK lobes like the TREX is too.

Nate_Taufer

iTrader: (1)

It doesn't with a stock thickness gasket. When you lose close to .020" from just a thinner gasket you're pushing it.

Nate

orangeapeel

iTrader: (18)

You also have to remember that fittament is based off of valve events. Sure, there is probably a way to get a near .700 lift cam in there (don't take this literally, just trying to prove a point) and have it fit like a dream with a little to scrape by on. It would most likely do you no good unless you are sending the bottom end to 8k also.

Valve Events, Valve Events, Valve Events are what is going to determine "if it fits".