I have a LO3 305. I was considering getting a used set of L98/LB9 factory EXHAUST manifolds for my car.

Then I saw the real nice LS1 factory exhaust manifolds and I thought .. "Hmmmm, that looks like a far superior piece and i bet i could find someone tossing a set of those for cheap.

Did Chevrolet change the EXH port location/bolt pattern from the LO3 heads to the LS1 heads?

PS
I know I would have to have a custom Y pipe made, but I am in CHarlotte, NC so that should be easy.

Mike

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1988 Camaro Sport Coupe305TBI-4spdAOD-2.73open in "bought stock" condition. That'll change if it stays around here much longer

 

Nope... And it wouldnt work either. Look at the LS1 manifolds. They four holes are equally spaced apart. 1st and 2nd gen SBCs had the middle two close toghether. They kinda look like Ford headers... lol

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92 Z28 L98 350
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Ported and polished heads, ported stock TPI base, ported plenum, Comp Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster catback with LT1 style tips, MSD coil & wires...

"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)

 

For all the pain and hassle of switching exhaust, just get headers. I think the exhaust manifolds are the same, anyway.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Nothing from a LS1 will work on a standard SBC.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

GO #3