LB9 & L98 difference??
Junior Member
Joined: Dec 2006
Posts: 55
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From: baton rouge,louisiana
Car: '88gta
Engine: 383 tpi
Transmission: 700r4
Axle/Gears: 3:23 australian 9 bolt posi
Re: LB9 & L98 difference??
Hey jeepboy180, the difference is really not the "block" size - the difference
is in the cylinder bore diameter of the block.If I'm not mistaken,the LB9 cylinder bore diameter is 3.723 inches making this a 305ci mill.The L98 has a cylinder bore diameter of 4.00 inches making this a 350ci mill. Hope this helps you out.
" The secret of life is honesty and fair dealing...
If you can fake that, you've got it made. "
Groucho Marx
is in the cylinder bore diameter of the block.If I'm not mistaken,the LB9 cylinder bore diameter is 3.723 inches making this a 305ci mill.The L98 has a cylinder bore diameter of 4.00 inches making this a 350ci mill. Hope this helps you out.
" The secret of life is honesty and fair dealing...
If you can fake that, you've got it made. "
Groucho Marx
Thread Starter
Junior Member
Joined: Mar 2008
Posts: 74
Likes: 0
From: Hudson
Car: 92' RS 25Th Anniversary
Engine: 305ci TBI
Transmission: 700R4
Axle/Gears: 10 bolt limited slip.
Re: LB9 & L98 difference??
alright, thank you. I was just wondering if their was a difference in anything else? Such as the heads, Ecm, etc. Because I'd like to go from TBI to TPI. I was just wondering how far the range of availability on the parts went.
Senior Member
Joined: Aug 2005
Posts: 615
Likes: 0
From: Beautiful Tunnel Hill Georgia
Car: 67 Firebird Convertible
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.55
Re: LB9 & L98 difference??
The heads have smaller chambers and valves also.
Most everything else is the same.
Most everything else is the same.
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: LB9 & L98 difference??
The TPI intake itself is identical. The block has different pistons and rods, and cylinder heads.
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Joined: Feb 2002
Posts: 1,141
Likes: 0
From: Nashville TN
Car: 1989 Trans Am
Engine: 355 HSR
Transmission: Pro-Built 700r4 w/ 3400 converter
Axle/Gears: 10 bolt w/ 3.42 gears
Re: LB9 & L98 difference??
The ECM is the same unit, but the actual .bin (tune) is different.
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bore, cylinder, diameter, diff, difference, differences, differentiate, engine, heads, l98, lb9, tpi, transmission
