3800 series 1 lack of power in the "yellow" rpm zone - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-08-2011, 03:08 PM   #11
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Thanks a lot but don't rush yourself, I probably won't be doing this before august!
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Old 04-08-2011, 03:33 PM   #12
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Thanks a lot but don't rush yourself, I probably won't be doing this before august!
Yeah that'* what I told myself too, then I found myself ordering the gaskets too soon and seeing them in the box every day made me go nuts enough to tear that engine apart.

Porting took about 6-8 hours while being very careful. Well worth the time for the amount of power I gained.
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Old 04-08-2011, 04:49 PM   #13
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Haha I guess that this is whats gonna be happening if I order the parts before the very day I'm ready to do the work!

With average mechanics skills, how long do you think it can possibly take to do everything? Is there a lot to take out before actually reaching to head bolts or it'* pretty much like : disconnect exhaust manifolds, intake, supercharger belt and voila?
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Old 04-08-2011, 05:46 PM   #14
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Haha I guess that this is whats gonna be happening if I order the parts before the very day I'm ready to do the work!

With average mechanics skills, how long do you think it can possibly take to do everything? Is there a lot to take out before actually reaching to head bolts or it'* pretty much like : disconnect exhaust manifolds, intake, supercharger belt and voila?
You can get all the way down to the block in about 4 hours, less if you take the time to take pictures and write down the steps. A Haynes manual might be a good idea if you haven't worked on this motor before. That will include torque specs for when you put it back together.

There'* not a lot to take out. Like I said, its a pretty easy engine to work on. Expect it to take a weekend as a worst case scenario. Start on friday night, do most of the removal and porting on saturday, and put it back together saturday night into sunday. Its not too terribly involved, just keep track of the bolts. I used an empty egg carton to organize the bolts in order of when I took them off, so going in reverse order I knew what was next.
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Old 04-08-2011, 09:09 PM   #15
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Allrighty then, can't wait to do it
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Old 04-09-2011, 02:18 AM   #16
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Here are posts I made elsewhere about the porting job I did:

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After a while I got sick of unbolting **** so i started porting my new heads, and made some massive improvements with the exhaust ports. I'm 100% sure this will make a huge difference. You can see the size of the actual exhaust manifold in black around the port, just to give you an idea of how tiny these ports really are.

This was all done with grinding stones on my dremel and my cordless drill. I wish I had my air die grinder back. :(












I kept the ports d-shaped as they were from the factory because A. there isn't much you can do with the floor of the ports as far as flow goes, and B. they were made that way to prevent reversion.

I still have to do some light sanding to smooth out the ports a bit, but that'* where I am so far.

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Got some more porting work done today.

There are some pretty big casting imperfections that I smoothed out. Keep a close eye on the before and after shots of the floor of the intake ports, and the edges of the exhaust ports near the valve seat. Also look at the casting around the valve guide. I didn't get many pictures up, but I took away some material around the valve guide to allow for better flow past the valve.

Ridges on the exhaust port:


Ridge on the floor of the intake port:



Casting around valve guide:


Other rough casting imperfections:



After shots:





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Got some more progress done today.

Before:






After (I lapped the valves after this):










Heads are now torqued down, and I got the first set of rockers on. Then I realized it was 11:00 so I called it a night. I'll finish the car tomorrow.





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Old 04-09-2011, 10:46 AM   #17
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Dayum, good game bro'! These castings are pretty imperfect from factory XD
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Old 04-10-2011, 03:25 AM   #18
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Dayum, good game bro'! These castings are pretty imperfect from factory XD
Yeah no kidding. You can see now why I made such a big deal out of it, lol. Those are holding you back more than you can believe.
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Old 04-10-2011, 11:24 AM   #19
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I believe I stumbled across some info saying the series II had a better fuel consumption because of it'* revised manifolds... I guess I know what they revised!
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Old 04-10-2011, 12:18 PM   #20
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I was closely looking at your pics : of far or you at this point from reaching the cam???
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