1986 2.8L. Changing all the gaskets. Good time to throw a cam in it? - All Things V6 - Firebird Nation

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1986 2.8L. Changing all the gaskets. Good time to throw a cam in it?


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#1 Backinblack

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  • Year: 1986
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  • Model: W69 S/E
  • Engine: 2.8
  • Transmission: T5

Posted A week ago

Seems 35 year old cork gaskets just don't hold up like they used to...  ;) 

 

While I've got half the motor out of the car, would now be a good time to throw a cam in it, or is it not worth it any more...?  Engine has 75k miles on it.  I've already replaced the exhaust with 2.5" plumbing, so some of the low end has gone away.  Might be nice to get some of it back...



#2 sea dog

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Posted A week ago

Didn't know you could stll get  a high performance cam for a 2.8 v6. I would also change timing set while your in there. And it wouldn't hurt to upgrade the lifters, valve springs, & rocker arms to go with the hp cam.

 

On the other hand, if your talking about a new standard cam, I see no reason to change the cam unless the cam lobes are worn. With 75K on the clock your engine, if properly maintained, should be like new.

 

My 90 3.1 v6 has close to 300K on the clock. It still runs fine.

 

That 2.5" exhaust you put on the car is too large a diameter for a stock 2.8. That's why you have lost low end torque. If you modified the engine with a way bigger cam,high compression pistons, long tube headers, ported & polished heads, etc,  then a bigger diameter exhaust would help the breathing.



#3 Backinblack

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Posted A week ago

Was looking at the Comp K16-233-4 kit.  Comes with all the timing components, lifters and springs.  I think the stock rockers should be ok for now.  I can always change them out later.  I'm replacing the distributor at this time as well, since for some reason the pickup coil copper rotted off it...

 

(https://www.jegs.com...-233-4/10002/-1)



#4 Backinblack

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  • Transmission: T5

Posted 4 days ago

Also, I discovered a large yellow paint "DBB" stencil on the front of my driver's side cylinder head, behind the A/C compressor bracket.  Any Idea what that is?



#5 sea dog

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Posted 4 days ago

Salvage yars like to put yellow marks on the parts they sell. Best I can guess at.



#6 Backinblack

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Posted 2 days ago

Turns out, from a document someone found for me over to the GM Heritage Foundation side, DBB is just one of the codes designating what mode and year the engine is.  No part of this car has come from a junkyard.  With the exception to the seals that I'm replacing right now, the t-top headliner and the exhaust system, the car is basically all original from Norwood in 1986...

 

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New distributor is a way better design than the original for sure!  Can't wait to see if this makes a difference at all...

 

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#7 sea dog

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Posted 2 days ago

I learn something new everyday.

 

Where did you buy the new distributor. I recently changed the distributor on my 90 v6 car. It looks just like the oem dist. Your new one looks much stronger than oem.



#8 Backinblack

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Posted A day ago

Rockauto.  I must have a half a hundred fridge magnets by now...

Delco # 88864747 distributor.


Edited by Backinblack, A day ago.





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