I was racing a few weeks ago and well hit the limiter hard. I just got distracted and shifted late. The car is smoking bad now. Out of both breathers(chugging), dipstick if pulled it even blew the valley cover seal and is smoking there. It smokes out of the exhaust especially when I do a heavy decel and then get back on it, it will studder when I do that too.
Looking for ideas before I dig into it. Could it be just the top end? Like a bent exhaust valve? Or does it sound more like a bottom end problem like a ring land? It happened all at once, smoked very little before.

Who is selling good cheap short blocks now, just a 347 is fine?

 

Pull all your push rods. You prob have 1 or more that are bent. It could also be a valve spring that is broken, make sure to look all them over also

 

yah and plus you could have piston ring failuer .

 

How will I know if I have just one or both? I'm going to pull the heads soon but would like to keep the short block together if I can.

 

just pull the heads out and see whats goin on .

maybe its minor problem ( i hope so ) .

 

# 7 is dead, its coated in an oil residue.
The springs, valves and seals are all fine on that one I didn't check the others.
The piston @ TDC looks fine as well. The only thing i noticed was on 1,3,5 all had a very light kiss mark from the intake valves, there is to much crap on 7 to tell.
Now what? I was hoping for a bent valve or something but everything apears to be fine.

Any idea's? I know #7 isnt sealing right but where? Please tell me it isn't one of the lower rings?

*There is PCV system on the car.

 

Yeah, that's what I was thinking. With hardened pushrods they don't tend to bend. Rather they don't give at all and you have piston to valve contact. Check the seat on number 7 and see if it took the blow.

 

I pulled both valves and they look OK so did the seats. I wish I had my stock heads, I would slap them on and see if it cured it. I think I'm going to take that head to a local speed shop and see what they have to say.

 

Could the valve and seat apear to be fine when it is in fact bent slightly and causing my problem?

If I broke a ring land would I be able to see it from the top?

 

could have done a leakdown test. and you could have listened at the breather an exhaust and figured out if it was a valve.


you can hear air escaping

 

+1 A leakdown test would have been the first thing I would have tried. It would let you know if your a) intake valves b) exhaust valves or c) rings where causing your loss in compression and eliminate your top end or your bottom end. At this point I would take your heads to a machine shop and have them checked. I was quoted at $30 from my local shop to clean and check a set of heads so it's not that expensive. Good luck man and btw #7 is known for ring failure on these motors.

Josh

 

Would I be able to see the ring land? The ring land if its gone would it be at the top and noticable?

 

what is you're limiter set at?

 

6700 but I blew past that, I know I hit over 7K.