5TH Gen COPO Camaro

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Originally Posted by Troy Pourciau

427
327/2.9
327/4.0
Suggested class
A Stock
AA Stock
A Super Stock
Cubic inches
427 (7.0L)
327 (5.3L)
327 (5.3L)
Block
LS7
LS9
LSX
Block material
Aluminum
Aluminum
Cast iron
Bore x Stroke (in.)
4.125 x 4.100
4.065 x 3.150
4.065 x 3.150
Crank
Forged steel
Forged steel
Forged steel
Rods
H-beam
H-beam
H-beam
Pistons
Forged dome
Forged dome
Forged dome
Compression ratio
13.5:1
10.2:1
10.2:1
Heads
LS7
LS7
LS7
Induction
natural
boosted
boosted
Intake
Holley 2.9L
Whipple 4.0L
Whipple
Camshaft type
Hydraulic roller
Hydraulic roller
Hydraulic roller
Cam duration (deg.)
233/276 @ 50
244/255 @ 50
244/255 @ 50
Cam lift (in.)
.595
.650
.650

when I take my shoes and socks off and do the math the 427 with a 4.125" bore and 4.100" stroke is 438 cubic inches. The Factorys are even taking care of the cheating for us now.
regards, Roland