killerwhale

man right now im really depressed dam it well i need some advice i just had ls6 799's heads put on my car shop just called me said it broke so i need help find out if it is my heads, or just not torqued down enough the heads are cnc ported flow about 310cfm and are milled .20 stock valves
u can see on my sig.. what other stuff i have well he tuned it for motor ran fine then when he juiced it he said after it idled down it started clattering bad and water n oil mixed he thinks maybe a water jacket blew so i called the guy that sold me the heads and he claims no way it could of be that he thinks it lifted a head he asked what they were toqued down to that he should of torqued em down to 90pounds so i call the shop where the car is at he said he torqued them at 80 is that a big difference could it have been that? theirs no hole in my pan and it will still run just knocking and clattering any idea what could of happened if that is even possible to lift a head??? help me please

s346k

iTrader: (4)

i'd guess ptv with an ms4 and 799 heads milled .020 and a flat top piston..

Reaperchild

Yup Ptv & flycutting ... It was the shops fault anyways that he didn't take the time to measure =s ... Was a professional handling your install .. Otherwise the garage must stand responsible for the failure ... Well torqued -10 theory - Experts please chime in ^^ =( damn sorry for your lose !!

Zmg00camaross

iTrader: (11)

I agree with the above. the water in the oil I dont know about, maybe didnt blow the water out of some holes.

killerwhale

THANKS FOR THE INFO everyone that wrote on here, but sorry i forgot to say they are dish pistons with valve reliefs but i went to his shop yesterday and heard it my self very loud tap noise sorta like if it is piston slap not sure though cause when u idle it the loud tap knock noise goes away and u can definitely tell its on passenger side front first piston u can put your hand on the front the pass. head an feel the tapping just wierd that it goes away when u give gas well he is gonna stick a camera down in their through spark plug hole to see if the piston looks damaged if not hethiks maybe cam bolt broke or bearing idk

67RSCamaroVette

iTrader: (63)

Check the pushrods for straightness, check for broken valvesprings, damaged plugs. I would guess that when the heads were done, the holes weren't blown out completely, and it cracked the block. Unless it's detonating bad, it definately won't lift the heads. What was the AFR and timing during the nitrous run?

killerwhale

its not detonating and really theirs barely if any water in oil

Chris'stransam

iTrader: (7)

how much of a shot? I had my stock ls1 with 165,000 miles on it and sprayed 150 with no problem.

Chris'stransam

iTrader: (7)

I would never leave my car with anyone , especially when its getting tuned.

killerwhale

its only a 150 shot on mine too and he is very well known tuner in my area

67RSCamaroVette

iTrader: (63)

It's possible that you spun a rod bearing. What did your oil pressure look like before the pull?

killerwhale

oil pressure was pretty normal and still is when u turn it on

garygnu

do a leak down test and pull the valve cover ,look for broken stuff .

87silverbullet

iTrader: (11)

How much timing did your tuner pull for the nitrous?

killerwhale

well he called me last night and said he found bearing derbies in valley

killerwhale

Getting my car back tomorrow from sqr hell yes finally gotta break it put some miles on it before it goes back on the dyno

01ssreda4

iTrader: (96)

Say what??!??