On my 04 LS1 it generally runs 30s to mid 40s psi through the ranges. Never seen it drop to 18 for sure even warmed and running mobil 1. Maybe high 20s 100 degree summer day all wormed up after freeway driving for awhile.
In fact I used 20 PSI for the red light on my Aeroforce gauges and it has never lit up.
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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
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