javier1730

iTrader: (16)

I took the heads off my car to do a head H/C swap. Well today i started to clean the carbon build up on the piston and they have small valve reliefs on the intake side. Is this normal on a stock ls1? i always though the pistons were completely flat. My car is a 98 z28. are these stock?

Z28Drifter348

No. Somebody made the reliefs for sure.

JustAFooL

iTrader: (45)

Most definitely. Just got mine off on my 98 and they are flat

bww3588

iTrader: (49)

Or they were self clearanced...

javier1730

iTrader: (16)

ill try to upload some pics later, judging by the size ill say they were self clearance but i checked the valves on the heads and they all look good, also there are no cracks on the pistons, just that small relief on the intake side. Now was thinking if that could affect something since ill be running N2O on the car. what do you guys think?

dmiz0420

iTrader: (8)

my first thought as well.

found this on my 97... definately self clearanced, always had this wierd ticking... till I swapped my heads...

javier1730

iTrader: (16)

i got some pics of the pistons i looks like they were self clearance since #8 and #7 have no marks, let me know what you guys think.
pistons 1,3,5,7

javier1730

iTrader: (16)

these are 2,4,6,8

01ssreda4

iTrader: (96)

dot means stock piston. Somebody over-revved

ScottyBG

Those look like the original head gaskets too, curse them well, cleaning up that mess. Since it is an original looking gasket, I doubt the heads have been off the car to check the valves, or fix anything after that PTV collision. Do you know what cam was in the car?, does it have stock valve springs?

javier1730

iTrader: (16)

the car had stock heads, and stock valve springs as well as a stock cam so i thinks it was over revved as stated above ..for the gasket i used a scraper to take off the old gasket residue...but whatever is left is not coming off easily,is there a better/faster way to clean the deck? also would those pistons cause a problem?

bww3588

iTrader: (49)

Be careful using anything other than plastic ice scraper or credit card to take that stuff off. The aluminum block is soft and if damaged, the gaskets will leak.

javier1730

iTrader: (16)

i was using a plastic scraper, but i couldn't take much off the old gasket, so i switched to the metal...i removed as much as possible being careful, but i just dont wanna risk it, with whats left of the old gasket.

Tainted

iTrader: (9)

Brake cleaner helps get that **** off and can clean up those pistons.

bww3588

iTrader: (49)

The roloc wheels work great too.