coscast c20xe head problems!!

[scooby-KILLER]

rite i have recently done the head gasket on my c20xe corsa, reason for that was it was reeking smoke at high rev's, i wasnt sure if the gasket had gone or not so had the head skimed and valve stem oil seals replaced,the valve seats seemed ok so never got re ground/cut, after re-fitting the head, i warmed the engine upt temp then let it sit for a hour or so then took it out for a run,everything was ok,a day later after changing the fuel pump i was out for a run and came across my m8s evo! so i passed him cuming of the dueller and as we went bk up just before i put it into 3rd she belched out a reek of smoke so got the car home it had used a tad of water and she was miss firing and eventualy wouldnt start,

i am having the head presure tested to eliminate any chance of crack's etc..

could worn valve guids cause smoking at high rev's???

done comp test and she was showing between 8 and 8 and a 1/2, is that ok??

any ideas as to why or what could have cosd it to have a re-ocuring problem???

any help much appreciated!! thanx

[ephid0r]

burning oil under high load usually indicates botom end like rings / crank

for stem seals all it needs to do is idle and then when u rev it will blow out oil

i would check the coolant pressure after warming up - does it blow more oil when coolant system is pressurised !

i blew a head gasket on my nova gte and it did not lose oil or water, coolant system got very pressurised and the top hose expanded, started to blow oil under pressure, then ran oki once pressure released

check the usual parts like gunk in head and underneath cam cover, gunk in coolant tank, water on dispstick

your results are a bit low - should be around 12 - 13 bar

you using new bolts ?, are the bolts torquing correctly or bottoming out ?, is there any damage to cylinder walls ?

[mulletor]

sounds like rings i had a 250,000 mile redtop in a nova an it started smoking at high revs then got worse an worse until i was using a litre of oil every few days.

did you torque the head up right as there are 2 different length head bolts and the longer bolts in the shallower block dont torque up right. [tighten up too early]

[scooby-KILLER]

yeah the head was torkd down rite! and i have put the head in 2 day for pressure testing so will wait and c what they say???

there is no gunk under cap filler! no water on dip stik or oil in tank!,

the cylinder walls r sweet there is no lips! the hoses either side of the rad have alot o pressure when it was runing??

[scooby-KILLER]

head is not porous was told it was the rings and that the block needs honed,or boared out depending on the condition of it???

[ephid0r]

any boring on the block needs bigger pistons = big bucks