I have another post on page 3 but the motor has since been rebuilt – this is the new combination. Car is a ’69 Firebird, full body car. ~ 3600 lbs curb weight.
Engine Modifications:
69 400 2 bolt block bored .030
Deck height set to -.001
#62 Iron heads - home port to 275cfm @ .500 lift - heads milled to 10.4 compression with .040 gasket
Stock 10/10 crank
Eagle H-beam rods with ARP fasteners
Forged Probe SRS Pistons
Bullet Solid cam 260 / 258 duration @.050 - .554 / .586 lift int / exh
Crower Solid lifters with EDM hole
Crower 1.6:1 roller rockers
9-way Timing chain from P.P.R. (nice piece)
Edelbrock Performer RPM Intake, top 1” milled out of plenum divider and light porting
Heads and intake port matched to RA IV gasket
825 CFM Mighty Demon
Mallory Hyfire IV
Mallory Mechanical magnetic distributor
Transmission:
’69 Muncie has been upgraded with Super Case, Iron Mid plate, M22 wide ratio gears
McLeod SFI Aluminum Flywheel
11” clutch
Rearend:
Dana 60 with 4.10 gears and 35 spline Strange axles and Aerospace disc brakes
Nitrous Top Shot set to 150hp
Best all motor pass is 11.82 at 115 or 116 mph. Can run 12.0 at 114 pretty consistently.
Best nitrous pass is 11.20 at 125mph. Also pulled similar times on 100 shot.
Still tuning …
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