L36 and L67

[Razor]

Need sum education

What are these numbers..what cars they comprise & from what years?

Whats the difference in the heads?

Thanks..

 

[98GSMN]

Regal GS/ Grand Prix GTP/ Bonneville SSEI/ Park Ave Ultra
97.5-03 L67 3800 SC Series II
04 Impala SS/ Monte Carlo SS
240hp 280 ft lbs tq

Grand Prix GTP/ Bonneville
04 L67 3800 SC Series III
260hp 280 ft lbs tq

Regal LS/ Grand Prix GT/SE / Lesabre/ Park Ave/ Bonneville/ Intrigue/ Monte Carlo SS / Impala LS
97.5-03 L36 3800 NA Series II
205hp 235 ft lbs tq

L67 motors have different compression, heads, and intake

 

[Razor]

So the heads with roller fulcrums started in mid 97..nothing earlier had roller fulcrums?

What is the rocker physical difference between the two ?

 

[INTENSE-Racing]

L36 is the normally aspirated Series II engine, and L67 is the supercharged version. Here's a list of the engines our rocker arms will fit:

1995-2003 Bonneville with 3800 Series II engine
1996-2002 Camaro with 3800 Series II engine
1998-1999 Cutlass with 3800 Series II engine
1996-2002 Firebird with 3800 Series II engine
1997-2003 Grand Prix with 3800 Series II engine
1998-1999 Intrigue with 3800 Series II engine
1996-2003 LeSabre with 3800 Series II engine
1998-2003 Lumina with 3800 Series II engine
1998-2003 Monte Carlo with 3800 Series II engine
1995-1999 Oldsmobile 88 with 3800 Series II engine
1996-1996 Oldsmobile 98 with 3800 Series II engine
1995-2003 Park Avenue with 3800 Series II engine
1995-2003 Regal with 3800 Series II engine
1995-2003 other applications with 3800 Series II engine

Hope this helps.

Scott

 

[Darth Fiero]

Originally posted by Razor
So the heads with roller fulcrums started in mid 97..nothing earlier had roller fulcrums?

What is the rocker physical difference between the two ?

The series II 3800 Supercharged L67 engine was first produced in 1996. The series II 3800 was first produced in 1995 but did not replace all 3800 series I engines until 1996.

Pertaining to series II 3800 engines only:

The L36 and L67 all have the same heads. The exception is the L67 heads had bosses machined for injectors. The L36 had these bosses but they were not machined. ALL L36 and L67 engines 95-present had roller fulcrum 1.6 ratio rocker arms.

Supposidly the head castings changed starting in the 98 model year became "beefier" in order to fix a problem in where cracks could develop around some of the exhaust valve spring seat areas. I have yet to see this happen myself but I have heard stories from people who have done some significant head porting.

There are more differences between the L36 and L67 than someone previously stated. Here is what is different:

-Pistons
-Connecting Rods
-Crankshafts (same part number between L36 and L67 but balanced different to compensate for rods and pistons)
-Intake, Supercharger
-Heads are same casting but machined different
-Valve covers
-Camshaft? some say different, ALLDATA shows same P/N
-Crank balancer (L67 has grooves for 2 belts)

Other than that, block, exhaust manifolds, timing cover, etc are all the same between the two engines.

 

[SCREGAL]

Darth Fiero, are you the one with the silver Fiero?

 

[Darth Fiero]

Originally posted by SCREGAL
Darth Fiero, are you the one with the silver Fiero?

Yes, I own a silver 87 coupe with black spoiler and 96 Grand Am GT 3-spoke wheels.

 

[Darth LC2]

what is up Darth?

 

[Darth Fiero]

Originally posted by Darth LC2
what is up Darth?

Nuttin, just learning a little more about adapting the 95 SC timing tables to a 97 Turbo engine. bumped the part throttle, no boost timing up by 5-10 deg and can nearly burn the tires off from a dead stop without boost. gas mileage should go up by 15% too. I think the SC chip is assuming there would be boost at those load values whereas the turbo is not boosting there. I think the series I SC also ran a slightly higher static CR so the timing was a little too conservative for a series II.