1991 RS 305

So I did the vortecs, milled to 56cc's with .015 shim gaskets. New springs and seals on the heads, lt1 cam, performed air gap intake, ultimate TBi mods, hooker headers, cat delete. Car runs fantastic, but I get a puff of bluish smoke every now and again when i start it. No oil in coolant or coolant in oil. Could I have a bad valve seal, even though they are new? any ideas as to why it does this, only on start up? NEVER did this prior to mods, and it started immediately after mods. engine appeared to be in good shape, cross hatches in all cylinders still, no ridge at the top of the cylinders. Any ideas?

Thanks, Matt

DLV555

iTrader: (1)

Valve guides?

91RedFirebird

sounds like you need to do alot of tuning. Still running the stock chip?

ShiftyCapone

iTrader: (7)

What type of valve seals did you go with? Were the guides cut on any of the heads before you installed the seals?

r0nin89

When i first bought my car it smoked a little on startup. Then i removed the AIR system now its like theres little elves hotboxing my catback and all the smoke comes out when I start her up. Its all good after that though...

1991 RS 305

Stock tune, bumped fuel pressure and ported TB. I know the car has lots more potential, but it's driveability is actually great. When the engine is cold I can make it bog, somewhat due to the air gap.

As far as brand of seals, not sure. I took the heads to a local reputable machine shop. The advised me to a few things, so I'm sure if the guides were worn they would have tried to sell me new ones. Is seals or guides what i'm probably lookin at here? All emission crap is gone, not that this would make a big difference at start up.

Thanks again, Matt