Brian'sCharlotte(TA)

iTrader: (2)

Would an aggressive head/cam set up (say MS4 and PRC215s) destroy a stock bottom end with about 100K? Anyone have any success running larger similar set ups on stock bottom ends with around the same mileage?

orangeapeel

iTrader: (18)

well, you are going to be replacing a lot of moving parts up top so it should be safer there. I would say no. You should be fine. Just know that you might want to replace the rod bolts. Only thing that could destroy it really fast is an issue with PTV. Thats a tight combo, and TSP will set it up properly valve wise if you are getting the heads through them.

Brian'sCharlotte(TA)

iTrader: (2)

yeah, that was the plan. I'm just beginning to think that the motor wouldn't handle all of that with a tired bottom end. But I had planned to replace it after a while anyway... I just need it to last a little while though

00MaroonZ28

iTrader: (3)

You'll be fine. I had 116k miles on mine when I did my build. Just replace parts that wear.

IWGF

iTrader: (6)

I did H/C/I/N2O at 100k miles. You'll be fine.

orangeapeel

iTrader: (18)

and just to add to what they are saying I did 244/248 cam at 92k and to my knowledge its still in the car...to whoever owns it.

Mike Morris

iTrader: (55)

As long as your motor is healthy you are ok...

twitchtwice

iTrader: (12)

yeah just make sure you replace all the gaskets on the parts that you are removing. and make sure to get at least a stock ls6 oil pump along with the new o-ring, as well as an ls2 timing chain. other then that you should be set.

99T/AMAN

iTrader: (1)

I just got done doing my h/c setup at 88k and still had the cross hatching marks on the cylinder walls. I replaced rod bolts also so i could spin it as high as i want

The_Rizzle

iTrader: (4)

Ha - I've got you all beat!

438,000 Km 1999 5.3

cam, rod bolts, bowl blend, head milling (.050) 918's, victor jr, 7500 rpm limit, and went off road racing it! Held together just fine. thing still has 45 lbs hot oil pressure, same as when we started!

Just do a compression test before to make sure everything is good to start. And check a rod bearing or two when you do the rod bolts, but I can't see anything being wrong unless you have bad oil pressure.

98RedRocket

mine has over 200K and im about to cam n stall the old biotch!

orangeapeel

iTrader: (18)

Its nothing spectacular when a truck does it! Still that is a lot of miles for a modified motor.

The_Rizzle

iTrader: (4)

It was pulled becauce of low comp in cyl 7, dry, so out of the tow vehicle it came.

The friend who I helped build it, wanted to see how cheap we could build some hp. The engine had great oil pressure, and no piston slap on startup. We pulled the heads and dropped the pan, the rods we checked had very good bearings, same as the mains, and the only ridge at the top of the cyl's was a little bit of slightly oily carbon (I've yet to see a decent km'd truck intake that isn't covered in oil inside) and the two pistons we pulled had rings that rotated freely, without having worn out ring grooves. If it wasn't for him having the truck from his work, where he bought it from 3 years ago, I wouldn't have believed it was a high km engine.

Also, the company does highway maint. up to 2 hours away, so I'm sure LOTS of the km's were highway, and not abused like a sports car. I wouldn't blindly do what we did to every ls engine that can get to that mileage, especially if it was showing any signs of age (using oil/bad oil pressure/knock) but this one checked out ok.