wallace millner

I have f54 block n42 head put new cam,springs,rockers,lash caps in head used 1975 head gasket now car smokes blue smoke.oil in intake could using wrong head gasket cause this.don't smoke till i changed heads.

wallace millner

i have a 1978 280z wiyh f54 block n42 head problems started when i put the head on car smokes blue smoke valve stem seals are new.i used 1975 head gasket i know i should have used f54 head gasket now but will it cause car to smoke also oil in intake

theramz

Did you replace the valve stem seals?

wallace millner

yes they are new every-thing in head is new

wallace millner

if you use wrong head gasket with n42 head f54 block can it cause car to smoke[blue smoke]

theramz

Start rechecking everything. All the plugs. Compression and leak down test. Something as simple as too much oil in the crankcase. Stuck pcv valve. Stuck egr valve. The F54 block is not original and if you don't have it decked then it could be leaking. The P90/P79 heads have an extra oil return passage. When I do a head I coat both sides of the gasket with copper sealer paste to make up for the decks surface.
Usually oil in the intake is from bad oil rings but on a fresh engine a little oil can cause smoking for some time.
What is the history of the block?

wallace millner

it didn't smike till i put the n42 head onran very well with the p79

wallace millner

could the new head cause the block to become weak and rings leak

wallace millner

when i remove head it was soaked in oil all the way across exhaust ports were dry

theramz

I never did a side by side comparison but I did notice that a N gasket was different than a P head gasket. Maybe check to see if the cam cover is filling up with oil and blowing into the breather hose. Crankcase vapors are meant to be burned but oil fog will pass right into the intake. Interesting!

wallace millner

whan i added header i removed erg valve could this cause my problem

wallace millner

could the head be sucking the oil out of the block when valve close because pistons look good but valves are cover in oil.cam couldn't have any-thing to do with it

hoov100

Was the head surfaced before it was put on? Did you properly torque the head bolts? Are you using the correct head gasket?

wallace millner

i torqued head but i used n42 head gasket i should of used f54 block head gasket.but would the wrong gasket cause car to smoke.

NismoPick

Please heed the previous given advice... Did you do any of the checks TheRamz mentioned?

FYI... all L24-L28E / L28ET blocks have the same oil and coolant ports... the heads vary. So when you are rebuilding an L-Series motor, use the appropriate gasket for the head... you match the head gasket holes to the head ports, not the block.

wallace millner

i'm confussed i was told to match head gasket to block.i took off the n42 head gasket replaced with f54 head gasket.changed afm seams to smoke less had to quit started to raining.i'm going to drive it abit and see what happens,hope it quits if not tear it back apart.

wallace millner

the n42 head has spray bar should i keep or remove spray bar.[oil spray bar]

wallace millner

1978 280z n42 head f54 block.the question is which head gasket to use

NismoPick

In case you haven't noticed, I keep merging your threads because we don't need 50 conversations on your 1 problem.

And I already answered your question about the head gasket.

And if you are asking a question, please use a QUESTION MARK [ ? ] at the end of the question so people know it's a question and not a statement. You'll get answers a lot faster in life.