LT5 CORVETTE ZR1 INFORMATION
    The LT5 engine was available 90-95 Corvette.  The ZR1 engine sported an all aluminum block and cylinder heads, DOHC (Dual Overhead Cams), and 32 valves (4 per cylinder).  The LT5 had a super high redline and broad power band, making it the fastest production vehicle of it's time.

HEAD CASTING #'S

BLOCK CASTING #'S

 

LT5 CORVETTE ZR1 CYLINDER HEAD CASTING #'S
CASTING # YEAR CID NOTES
10106178 90 349 LT5, DOHC, 32-Valve, Aluminum, passenger side head
10106179 90 349 LT5, DOHC, 32-Valve, Aluminum, driver side head
10174389 91-94 349 LT5, DOHC, 32-Valve, Aluminum, driver side head
10174390 91-94 349 LT5, DOHC, 32-Valve, Aluminum, passenger side head
10225121 95 349 LT5, DOHC, 32-Valve, Aluminum, driver side head
10225122 95 349 LT5, DOHC, 32-Valve, Aluminum, passenger side head

    The LT5 Corvette cylinder head was aluminum, and consisted of 32 valves (2 intake valves and 2 exhaust valves), all operated by 2 camshafts per cylinder head.  Spark plugs were located in the center of the combustion chamber for maximum power.  There were 3 different versions of the LT5 cylinder head, although they are all very similar.   This cylinder head is unique to the LT5 Corvette engine, and is not compatible with any other engine platform.

SPECS : 22 degree, 1.54" intake(2), 1.38" exhaust(2), 10.25:1 CR

 

LT5 CORVETTE ZR1 ENGINE BLOCK CASTING #'S
CASTING # YEAR CID MAINS NOTE
10090511 90 349 2 375 HP
10153558 91-92 349 4 375 HP
10199001 93-95 349 4 405 HP

Early model LT5 engines had 2-bolt mains.  Later models came with 4-bolt mains.  3.90" Bore, 3.66" Stroke, 11.25:1 CR