[bluechevelless]

Another intake valve guide came apart on my 454 bbc. this is the 3rd time and its a different cylinder this time. What is weird is that it came apart on cylinder no 2 but started causing cylinder no 7 to burn oil like crazy. I cant find anything wrong with no 7 cylinder. Why would it make it burn oil like that?

 

[bluechevelless]

Ok borrowed a spring compressor that wont turn into a pretzel with my spring pressures and got it apart. The guides were knurled at some point and all are loose as all get out. Also the oil burning problem, the TOP of the guide broke off with the valve seal, so it was sucking tons of oil through the loose valve guide that was now broken off flush with the spring pocket.

 

[jeff swisher]

sounds like a mess..sorry to hear that

 

[bluechevelless]

Yea big mess. Do not understand why its doing this either. I Checked the geometry before I assembled the motor.

 

[jeff swisher]

blue chip motors installed guides in a 186 head for me and one guide felt loose as i assembled them.. i called them on it and they stated all was measured..
I ran it and 2 weeks later all cylinders had 245psi cranking pressure except 1
and that one had 60 psi..bad guide..the one i told them about..
I was beat by my 11.51 second V65 magna by 2 feet in that car with 1 weak cylinder..I was slightly pissed...and they did not want to stand behind it..

Only work they ever did for me...out of business today though..and a buddy of mine owned it....you never know who your real buddies are..
so could be just bad machine work...

 

[pnugene]

Ok borrowed a spring compressor that wont turn into a pretzel with my spring pressures and got it apart. The guides were knurled at some point and all are loose as all get out. Also the oil burning problem, the TOP of the guide broke off with the valve seal, so it was sucking tons of oil through the loose valve guide that was now broken off flush with the spring pocket.

Knurling valve guides is a cheap and dirty substitute for installing new guides. Knurled guides typically don't last very long before the engine starts using oil. If your geometry is good, I don't know why yours broke off.

 

[Stokerboats]

blue chip motors installed guides in a 186 head for me and one guide felt loose as i assembled them.. i called them on it and they stated all was measured..
I ran it and 2 weeks later all cylinders had 245psi cranking pressure except 1
and that one had 60 psi..bad guide..the one i told them about..
I was beat by my 11.51 second V65 magna by 2 feet in that car with 1 weak cylinder..I was slightly pissed...and they did not want to stand behind it..

Only work they ever did for me...out of business today though..and a buddy of mine owned it....you never know who your real buddies are..
so could be just bad machine work...

245 lbs cranking pressure? Nice.....:thumbsup:

 

[CharlieB53]

Knurling wore, excessive guide clearance allowed the valve to 'wobble', breaking the unsupported section of the guide.

Highly recommend you pull, tear down and inspect ALL guides, possible may need to replace all.

I'd be highly P.O.'d if a shop had told me the heads were 'fine'.