Cheby 250 I6 1bbl

[Anonymous]

What cam configuration did Cheby use to coax 175 hps out of their 250 I6?
Thanks,
Ken

 

[matt1967]

What cam configuration did Cheby use to coax 175 hps out of their 250 I6?
Thanks,
Ken

longer stroke, better flowing intake, ect...

 

[Anonymous]

Figures!
Ken

 

[Lazy JW]

They used gross horsepower ratings, not net horsepower. Very, very optomistic gross horsepower ratings. I have driven more than a few miles in those. Learned to drive in a Chebbie pickup w/three-on-the-tree and a 250.
175 hp? :rolflmao: :rolflmao: :rolflmao:
Joe

 

[rommaster2]

They used gross horsepower ratings, not net horsepower. Very, very optomistic gross horsepower ratings. I have driven more than a few miles in those. Learned to drive in a Chebbie pickup w/three-on-the-tree and a 250.
175 hp? :rolflmao: :rolflmao: :rolflmao:
Joe

To be fair though, so did ford for thier engines. Thier inline six may have had a better head though, IMO Fords biggest problem was that they were always trying to be the family affordable car. Hence we all have integreted and cheaper heads for our engines.

 

[CZLN6]

Howdy All:

The last version of the chevy 250 in light pickups went to a dual stage two barrel carb called the "Dual Jet" by Rochester. It also had a cast dual exhaust manifold. It also sported an honest, All-in-one HEI ignition system. The combo was good for about a 20% increase in real, rear wheel power. Still probably nowhere near the ad guys hype.

The down side was they stuch with the 4 port intake manifold that siamized the 2nd & 3rd ports and the 4th & 5th ports. As with FoMoCo, it may have been cheaper to produce, but no easy performance.

Adios, David

 

[Lazy JW]

Our 66 Chebbie had the single barrel carb. My nephew still uses that pickup as his daily driver, it has given several hundred thousand miles of dependable service. The real world performance difference between it and a Ford 250/240 is purely conversational. We hauled a ton of hay on that little half-ton pickup more times than I can remember, lots of firewood too. Those Chebbies with their front suspension always drove nicer than a Ford. Too bad they don't build 'em like that nowadays.
Joe

 

[6bangerbill]

Ive done alot of drag racing with the 230 and 250 Cheby six in my 57 mga and a 27"T" roadster. I agree the stock head is a big disapointment for air flow in most cases ( but race modified heads commonly make 400 hp or more with the 292 motor). My solution was a not so "simple" modification. I bored 6 intake port holes at a 30 deg angle into the stock head and brazed in (6) 1 3/4" diameter intake tubes.This gave me a 12 port head with high flow straight intake ports. The 250 ingine will produce 300 hp or more in this configuration. The result with modified hilborn injection was consistant 11.20's et back in the stone age late 60's, pulling the front wheels on every pass.

The biggest problem was lack of cubic inches and the larger 292 engine had a tremendous crankshaft flex problem. I drove a 292, (3) weber carbed, (3) intake port head dragster that ran 9.50 et's for one season, but the cranks barely lasted one year. But the smaller engines were very durable and light weight. If larger cubic inches are needed, try the 300 ford for its strength.