Oldsmobile 350 Rocket Motor

[Letsrunum]

Originally Posted By: funflyer
Originally Posted By: wheelman1991
What's everyone's opinion of the poncho 400?


What year block? In the mid 70s the 400 blocks were cast with weight reduction in mind and had thin webbing around the crank which made them a poor choice for a performance build. I built a few Poncho stump pullers back in the day, before there were good aftermarket parts. With the parts available today you could easily turn a 400 into a killer 461 capable of tremendous numbers at 5000 RPM.


1972 block, bored 30 over


400...you weren't talking to me, my bad

 

[Letsrunum]

Originally Posted By: AntiMatic
In 1978 my 1st car was was a 72 Cutlass Collonade Coupe, burgundy with a white vinyl top: 350, 4bbl, 350 hydra. Put Hedmans and duals, but the 2.73 open was too tall. 1980 gas prices forced a trade to an Iron Duke Sunbird with a 4 speed. Fast forward to 2000, got the car in my signature: numbers matching 72 vert, except color and headers; put an Offy dual quad on it. Pretty neat, sounds great now with 2.5" Flowmasters. Wide ratio 4 speed and 3.23. Turns heads, esp when shifting thru the gears: less than 10% of Olds at the time had 4 speeds. Not smart enough to post the video on here.


I post videos through YouTube. Note to self, it has your name posted to the video link.

 

[SteveSRT8]

Originally Posted By: wheelman1991
What's everyone's opinion of the poncho 400?


I had a 78 Firechicken that would run 13.08 in full street tires with 2.56 gears! Excellent motor, used to spin mine to 5500-6000 if I was losing!

Read up on Ram Air engines from the old daze. They were real world runners with major stump pulling power...