Diagnostics on swapped-in L27 - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-01-2005, 01:24 PM   #11
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little advice since you are delving into this project. Bolts, the regular fel-pros are great, had no probs with them whatsoever. GM Gaskets.. SUCK, both intake and head gaskets were blown, at least one of them, and the other was not far behind. I have a few pics around here somewhere... they were nasty. get fel-pro head and intake gaskets... the intake gasket kit comes with EGR valve gaskets, tstat oring, intake gasket, intake seals, and some other misc stuff for a little tube on the TB, and the heater core tubing. You may as well put on the entire LN3 induction system [heads to TB] because that'll be much easier. get head gaskets for either engine... but intake gaskets for the LN3 for sure. good luck and clean everything extremely well, you'll thank yourself later.
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Old 10-02-2005, 12:20 AM   #12
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I used FelPro for the LN3 induction to the L27 longblock. Since the same store was my source of info on the bolts & head gaskets, it was most likely that I'd get them from the same place, and therefore they'd be FelPros again.

I've been through a few head jobs in my time. The last 3.8, though, was in 1983, the '77 Skyhawk engine I had put in my '76 Vega. I gasket matched the heads before putting it back together.
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Old 10-02-2005, 01:17 AM   #13
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I suppose before I start counting chickens I'd better pull the LN3 heads and make sure there weren't any valves damaged when the cam broke. Sounds like it'* a non-interference engine, but need to verify.
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Old 10-31-2005, 02:01 AM   #14
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Well, between not having any time and not wanting to spend any more money, we've just kept driving it. We've put about 1200 miles on the engine to date. Right after the last post, I decided to go ahead and try some Restore - $8.40, vs. $100 for gaskets & bolts to swap the heads. I've also been running a 6x dose of AMSOIL gasoline additive.

Amazingly, it does seem to be getting better. It still is a little rough at idle, but it is a lot smoother than it was before - I hope the cat hasn't been wiped out with the misfiring. Power is now as good as or slightly better than the LN3 was, although the '91 LE still is peppier. It'* hardly used any of oil since I added the Restore, having used about a fourth of a quart in those first 500 miles.

I don't know which is helping, just running it, having the synthetic oil in it, the Restore, the gas additive, or a combination of them. We may never know. I should have repeated the compression test before putting in the Restore, but again, no time. I hope to repeat it some day soon.

I've been thinking the engine had been sitting outside after being removed from the car with the MAF and exhaust manifolds open, three cylinders had a valve open, so those cylinders/valves corroded. Running is cleaning it up. Of course, I could be all wet.

Bottom line: If your LN3 is getting tired, and you find a good L27, this project has shown it will work with your LN3 induction.
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Old 10-31-2005, 02:29 PM   #15
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This has been a great thread... Its good to know that the L27 Long block will work in place of an LN3... Great work... This one has to go into my favorites...

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