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Old 12-14-2007, 05:19 PM   #31
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For everyone following this thread...

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The Above is an L27 of the 1995 Vintage...

This Block is exactly the same as the 1991 LN3 3800 Block.... They even have the same Crank... The difference between the 2 blocks is very simple.. The L27 had 2 more threaded Bosses the the LN3 did not get as it didn't use the Torque Axis mount.. So the 1991 LN3 is 99% the same as the L27'*... For all purposes they are the same exact motor...

88-90 had a couple of minor differences...

What made the the L27 a Tuned Port Injection Motor was the Intake design, and integrated PCV passages... It was still the same head as the LN3 with each having a new hole... So really you have the same engine, one could breathe a hair better than the other

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Old 12-14-2007, 06:11 PM   #32
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I didn't realize they were that similar, cool.

but wait a second... 1995 L27? Thought the L36 was '95
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Old 12-14-2007, 06:13 PM   #33
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Quote:
Originally Posted by 93-SSE
but wait a second... 1995 L27? Thought the L36 was '95
U-body vans (Dustbusters) had the L27 in 1995, as with a few w-bodies.
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Old 12-14-2007, 06:24 PM   #34
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Quote:
Originally Posted by 93-SSE
I didn't realize they were that similar, cool.

but wait a second... 1995 L27? Thought the L36 was '95
GM made Both the L27 and L36 That year... All of the U Body Mini Vans for 95 that were the upscale had the 3800 L27 as well as the LeSabre among a couple of others... So the L27 was still in use for 1995 as the L36 was being phased in

Only reason I know this is I had my LN3 down to the block like that in 01... The previous owner ran the motor hot or something as I had found one head had been reworked, but poorly... I had some vale float issues at 4500 Rpms, car would fall flat on its face... Could never get it to run quite right.. So I tore it down to the Block and went through it.. Heads were done, all new gaskets... Had to do the Interrupter and it popped out and stuck to the block... So I did the timing chain just cuz I was there... Car has run pretty good ever since... I do need to go back and replace the Crank sensor tho, it has a little hiccup at idle every now and again...

We have actually put LN3 Heads on an L27 Block and L27 heads on an LN3 block... we even used an 89 LN3 engine as a replacement for a 93 L27 in a Park Ave.. We simply parked the L27 heads and relater parts onto the LN3 Block... We were at the time shocked to see how close to the same the engines really are, minus a couple of those threaded bosses...

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Old 12-14-2007, 06:47 PM   #35
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Gwen is now out of the elements...she is parked in the garage, with *some* of the engine taken apart. Just a few of the peripherals, nothing major yet.

Yes, this is a 1995 block. Supposedly, one of the better engines of this vintage. Couple that with the low mileage this motor has, and this will be quite a shot in the arm when compared to what is coming out of Boozes engine bay

Got the head bolts in the mail today...now I need to shop around for the gaskets (actually, I have been shopping around, and I think I found a full set on ebay. I just got to check some numbers before I commit to it).
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Old 12-15-2007, 11:14 AM   #36
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Cool, sounds good!

Learning more everyday. Makes sense that they were phased in, just didn't realize it. Any differences between a '93 and a '95 L27?

I can't wait to get back down there.
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Old 12-15-2007, 11:25 AM   #37
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Quote:
Originally Posted by 93-SSE
Cool, sounds good!

Learning more everyday. Makes sense that they were phased in, just didn't realize it. Any differences between a '93 and a '95 L27?

I can't wait to get back down there.
Yes there are very slight differences for things or issues Gm was trying to correct for... the 92-93 3800 and 3300 engines had some main bearing clearances issues... This was not an issue with the 94-95 engines..

The one issue the 94-95 engines had was the Valve stem seals leaking a little... Brads 94 even has this issue and we have chatted about it and what to do with it... and the simple answer is that we'll end up replacing his valve stem seals in the future...

With the complete gasket set, your heads will get new Valve stem seals.... The 94-95 3800 L27 heads remind me a lot of the old chevy 350 valve stems... Great motors but for what ever reason they beat the vale stem seals...

I'd say by the time you even had a valve stem issue again the motor would be worn out by then...lol

Generally the 94-95 Motors ran a bit better than the 91-93 L27... But a little bit of that will be PCM differences as well..

Its funny tho, GM made changes to this motor over the years and never changed the HP rating... To drive a 92 L27 and then to Drive Brads 94 is like night and day... I'll be interested to see how this motor runs, drives, idles....

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Old 12-18-2007, 05:37 PM   #38
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Good info

All is going well I hope

I'm getting more excited every day.
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Old 12-18-2007, 06:49 PM   #39
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Guess I'll give my little update.

Got a halfway decent spring compressor to take out the valves before cleaning out the heads. Still a pain in the arse to do though.

Gasket kit ordered today. With any luck, I'll have the longblock completed next week. Then it'* off to taking out the ol' grimey, busted-up motor
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Old 12-21-2007, 03:44 AM   #40
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Are you expecting to have a lot of non-reusable engine parts like a damaged cam lobe or something? If so, can we discuss the shipping of those to me? It would be much appreciated.
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