This car is a very rare matching numbers RPO-Z/28
with original GM Cross Ram Intake and Dual
4-bbl 600 CFM Carburetors. Only about 500 GM
Cross Ram intake units were originally
produced. If you have one of these coveted
units you definitely own a piece of the Z/28
Trans Am legend.
Cross Ram Z/28’s are consistently
maintaining their value in the six figures
and will continue to do so. The Cross Ram is
by far the most desirable option for a Z/28.
Engine Horsepower Rating: 302 Cubic
inches/290 HP with stock intake and 458 HP
with Cross Ram Intake based on early GM Dyno
testing @ 7200 RPMS. This proves the stock
302/290 HP was way underrated for insurance
purposes because the Cross Ram Intake is
worth and additional 25.5 HP conservatively
with an equally respectable gain in torque.
Some reference say the Cross Ram was worth
up to a 100 HP.
This car is a X-77, Z/28 Produced in Norwood
Ohio GM Plant per the Firewall Data Tag.
Engine casting # 3970010 GM, Pad Stamp:
V1021D2
Cross Ram Casting # 3941130 (Production for
Trans-AM-SCCA Competition Racing. Contains
Winters Foundry snowflake with Trademark “W”
casting logo.
Carburetor #’s- 3957859, Holley list # 4295
rated at 600 CFM, dual feed, sliding cam
actuated secondaries and dual accelerator
pumps.
Transmission Casting # Front-385325,
Tail-3857584GM
Rear-end casting #3894880NF
Completed restored in 2003
Engine: 302CI/290HP-Compression 11.0:1 with
forged pistons
4 inch bore, 3 inch stroke
Solid Lift Cam
Double-Hump cylinder heads
2.02 intake valves, 1.60 exhaust
Power Disc brakes-RPO-J/52
Heavy Duty Radiator
Quick ratio steering
Dusk Blue with blue interior
GM Rally wheels
BF Goodrich white letter Tires-205 60R15’s
front, with 255 60R15’s on the rear
Muncie 4 speed
4.10 rear-end
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