The History of the ZL1    • ZL1 engines were not painted red,
while cast iron big blocks were. - 0   • ZL1 engines included
power saving clutch fans and forced air induction. - 1   • In
1971, Fred Gibb’s ZL1 Camaro held the AHRA national record in
Pro Stock at 9.63 seconds and 143 mph. - 2   • Fuel flowed
through dual 4500 dominator carburetors. - 3   • The compression
ratio was 12.7:1. - 4   • A Dana 60 axle supplied power to the
ground. - 5   • This is 1969 Camaro ZL1 #40. - 6   • The ZL1
block casting number for 1969. - 7   • 1969 Camaro ZL1 blocks
were all aluminum with a casting number of 3946052. - 8   • All
ZL1 cars came with aluminum heads. Intake valves were 2.19" and
exhaust valves were 1.88". - 9   • The ZL1 crankshaft is made
from 5140 steel tuftrided and cross drilled. The last four
digits of the casting number were 7115. - 10   • A Holley 4296
850 cfm dual feed double pumper was used on ZL1 cars. - 11   •
All ZL1 blocks were produced by Winters Foundry, noted for its
trademarked snowflake symbol