jermstyle

I just ordered a set of Absolute Speed S2.5 5.3ltr heads and I’m trying to decide on a cam.

I really wanted to go with the G5X3 cam, but I’m not going to buy new pistons right now and I’m not liking the idea of fly cutting my stock pistons.

With the 5.3 heads as they come from AS with no milling, the stock head gasket and 1.7 rockers. What are the largest cams that will fit with no PTV issues?

Here are a couple of cams I have been considering

G5X2
T-Rex
X1
C1

Other than these, I’m very open to ideas…

My mods are in my sig and my somewhat realistic goal is 455+ RWHP so I need a cam that can help me get there.

This is an M6 car with stock gears for now. It’s not a daily driver and I don’t really care about emissions, I’ll figure that part out when I get there.

I’m going to get a LSX intake soon and larger TB. And I’ll probably swap out for over axle duals soon.

I appreciate any help given…

Thanks!

Jeremy

Fireball

iTrader: (21)

since you have bigger valves...probably should drop the Trex since PTV is marginal even with stock heads (and stock valves)

jermstyle

Will the X2 clear?

jermstyle

?????

God of Thunder

gomer and damian got great numbers with ported ls6 heads and the F13 cam. i dont know how it would react with the 5.3 heads, but just thought i would suggest another

destroyerSS

iTrader: (2)

I have A/S 5.3 heads W/ 2.055 & 1.57 valves running a TSP 231/237 with no problems

jermstyle

Nice, this is the kind of info I was looking for. Much appreciated!

Anyone else?

LittleBoyBlu99

I'm in the same boat as you so MTI told me the new G1 or R1 would be a good strong cam to go with and not have to fly cut.

TTPMatt

iTrader: (18)

If Jay has not completed the set yet.. He can sink the seats a bit to fit the g5x series.. He did that for one of our friends so he could put a g5x2 on his c5.

jermstyle

He hasn't started on them yet and he did mention that he could sink the seats some, but he also said that it would limit the flow a bit.

The G5X2 is a 232/240 .595/.608 112 and DestroyerSS is running a 231/237 .598/.595 12 LSA with no clearance issues. I'm going to ask Jay about this cam and just see what he says about it.

Matt, what kind of power did that C5 make with the 2.5 5.3's and the X2 cam?

Black02SS

iTrader: (36)

I am pretty sure Damian is running 5.3 TEA's.

TTPMatt

iTrader: (18)

Not a lot, don't remember off the top of my head. I know that the car has other problems related to the install other than just poor flow..

And yes, it will limit flow a bit.. I would discuss with Jay about the possibilities.

To do it correctly, you will be notching your stock pistons. It's not a hard job, just time consuming.

1fastWS6

iTrader: (3)

Just because the 231/237 cam clears doesn't mean the 232/240 will. The ramps on the G5X2 are a lot faster and closer p-v clearance will be the result. You can't just look at the duration/lift numbers to make comparisons.

jermstyle

Okay… How about this cam…

XE-R 232/240 .595/.609 112+2

I talked to Jay this afternoon and he said this should clear if he uses the slightly smaller 2.032 valves.

Any thoughts?