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Preston Larson's 1970 Formula 400
(In His own Words)

This is my (restored by me) Admiralty Blue 70 Formula 400, powered by a 72 455/463 with original T-400 transmission, Jim Hand converter and original 12-bolt rear with 3.42 gears, Eaton posi and Moser axles. The original #'s matching YS code 400 is tucked away for safe keeping. The engine sports a pair of Dave's 295cfm KRE heads, cnc'd iron intake and a Ruggles built 800cfm q-jet. The cam is SD's Old Faithful 236/245/112 using Scorpion 1.6 rockers. The exhaust leaves through a set of 1 3/4" Hooker Super Comps with a Pypes 3" x-pipe system. This sweet Firebird has never been to the track but is extremely lively!!! It is also a very nice mannered street machine. Thanks to Dave for all of his expert workmanship and advice!!!


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Engine Specs.
72 455 block +.035, 4.21 stroke.
Pistons: Ross forged with -20cc dish. I originally built it with iron heads.
Scat h-beam rods. Stock length. Balanced.
Melling 60psi oil pump. 3/4 length windage tray.

Heads: KRE 72cc d-ports 295cfm by Dave.
.040" Cometic MLS gaskets.
Compression ratio 10.5 to 1.

Intake: Iron intake with plenum and runners cnc'd by Dave.
800 cfm q-jet by Cliff Ruggles.

Cam: Old Faithful 236/245/112 with Scorpion 1.6 roller rockers.

Ignition: MSD ready to run distributor with MSD 6-AL. 30* total timing.