Ok... need some questions answered about exhaust manifolds for 92-95 L67 cars and 92-94 L27 cars.

Are the manifolds the same for the L67?

and the L27?

And are either of the L27 and L67 interchangeable?

What about the other L67 cars? Are Park Ave, LSS, Riviera, 98 cars the same as far as the manifolds?

What about heads and LIM?

What gains would porting/polishing these gain?

Gotcha Jimmy. Here'* what you need to know There'* cylinder head info in there too because of someone I'm working with. Note that the L36s have a second right manifold part number for cars that are required to have California ECS

Edit: Sorry bout the bad spacing. Only the L36s have an extra manifold part number, the end number is the cylinder head part.

Part Numbers (GMPD):



YEAR MODEL LEFT MANIFOLD RIGHT MANIFOLD R. MANIFOLD (California ECS) CYLINDER HEADS

92 L27 24501727 25537100 24500363

92 L67 (S1) 24501731 25537100 24500363



93 L27 24502380 24500683 24501418

94 L27 24502380 24500683 24501418



93 L67 (S1) 24502380 24500683 24501418

94 L67 (S1) 24502380 24500683 24501418

95 L67 (S1) 24502380 24500683 24501418



95 L36 24504379 24505450 24507480 24508132

96 L36 24504379 24505450 24507480 24508132

97 L36 24504379 24503920 24507480 24508132

98 L36 24504379 24503920 24507480 24508132

99 L36 24504379 24503920 24507480 24508132

00 L36 24504379 24503920 24507480 24508132

01 L36 24504379 24503920 24507480 24508132

02 L36 24504379 24503920 24507480 24508132

03 L36 24504379 24503920 24507480 24508132



96 L67 (S2) 24504379 24505450 24507848

97 L67 (S2) 24504379 24503920 24507848

98 L67 (S2) 24504379 24503920 24507848

99 L67 (S2) 24504379 24503920 24507848

00 L67 (S2) 24504379 24503920 24507848

01 L67 (S2) 24504379 24503920 24507848

02 L67 (S2) 24504379 24503920 24507848

03 L67 (S2) 24504379 24503920 24507848

and that about sums it up.....great post Aaron.....makes it really simple to see what is what.....all that info needs to be a Techinfo...for all the people that are looking to do PEMS

I have more bro

Was actually going to send it in a spreadsheet form over to the admins. Part numbers for all the parts that can be ported.

It'* already posted in J Wikoff'* post from two weeks ago.

We already have all that info It'* been known for some time that something is different with the 92 L67 manifolds. We don't know what. We DO know what'* different about the 92 L27 mani'*, though.

I'm thinking it'* something to do with the tweaking stages.

Like 96 L67 had one set, 97 was a different set and different transmission...then 98+ is pretty much all one part after the tweaking had been done.

Yeah.. I'm compiling all sorts of crap about compatibility and whatnot.

Incidently, I was wondering something else about the 92s: Early 92 L27s had a beige upper intake and cover, while the later ones have the black upper plus cover. I wonder if the different PN only affects the pre June 92s?

it would have to, because the Early 92'* with the aluminum upper intake didnt have an EGR. the ones with the Black had an EGR, therefore they had to have a hole for the EGR in the front exhaust mani