HOME         CATALOGUE          TECH INFO          SHOW YOUR RIDE         CALCULATORS          ABOUT US         GALLERY        CONTACT US
     
 

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!!!

 
   

News & Events

What's new at SD in 2021
08.27.21
We're busier than ever at SD CNC porting and machining heads and intakes and putting top end packages more >>
What's going on at SD in 2020
05.28.20
We're keeping plenty busy in the shop in this crazy world we're all living in. Demand for our CNC ported more >>
End of 2018 is fast approaching!!
12.04.18
Well it's been a while since we had an update on what's been going on at SD so here's a quick overview. more >>

 

 

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.