LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lt1 ?

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Old 07-23-2007 | 05:13 PM
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BsGreenZ's Avatar
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Default Lt1 ?

i was told that the caprice Lt1 is smaller than the vette, camaro and t/a motors.. is that true is was there another way to tell cause i got offered a motor and want to jump on it but need a little more info.. thanks
Old 07-23-2007 | 05:26 PM
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an LT1 is a 5.7L/350 cid
an L99 is a 4.3L/267(?) cid

think my LT1's have 327 cast into the blocks, not sure if that helps any or not

can you get access to the car it came from? the under hood and or door/trim tags will tell you which it is
Old 07-23-2007 | 05:27 PM
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k thanks man...yeah i can get to it..
Old 07-23-2007 | 05:28 PM
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caprice heads on the lt1 are cast not aluminum... and i think all of them are vented optis??? dont quote me on that
Old 07-23-2007 | 05:28 PM
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This may help:

A 4.3 L version of the LT1, designated the L99, was introduced in 1994 for the Chevrolet Caprice. It was externally identical to the LT1, but the bore was reduced to 3.736" and the stroke to 3.00" (similar to the late sixties Chevrolet 302 used in the first-generation Camaro Z28s). The pistons used in the L99 were the same as the ones used in the Vortec 5000 with the use of 5.94" connecting rods.

Like the LT1, it features sequential fuel injection, reverse cooling, and an optical crank position sensor. Output is 200 hp and 245 ft.lbf.

Due to its smaller displacement, it provides better fuel economy over the 5.7L LT1.
i think the L99's have 4.3 casted on the block by the bellhousing flange.
Old 07-23-2007 | 05:32 PM
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Originally Posted by fast
think my LT1's have 327 cast into the blocks, not sure if that helps any or not
Yep, LT1's have 327 cast in the side of the block. The L99's have 588.
Old 07-23-2007 | 06:40 PM
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Originally Posted by GIZMO
Yep, LT1's have 327 cast in the side of the block. The L99's have 588.
I learned something new today.



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