Inliners International Forums General Discussion Engines GMC 302 McGurk intake advice

Hey everybody! I have been a spectator for a while, first time to post....
I Just recently purchased a rebuilt GMC 302, it came with the stock intake and a Holley 2 barrel. I have, over the years, acquired a McGurk SuperDual 2x1 small port intake (I had the orginal 228 in mind, then I found this 302) and a matched pair of rebuilt Stromberg BXOV-2’s. With a set of port adaptors, any reason why this set-up be would not be enough carburetion for the 302? Should I be looking for a large port intake? More carbs?

enough carburetion for the 302

Enough to do what?

Valid question. I am just looking for a good strong runner, nothing outrageous. Just don't want to starve it out (for lack of better description)on the high end.

Greetings . . .

I would think that a pair of BXOV-2 carbs would run great on a 302.

The stock Holly 94 is similar to the Stromberg 48 - in the 170-180 CFM range.

The BOXV-2 was standard equipment on small displacement sixes (Chevy and Dodge) during varying years from the early 30's to the mid 40's (sourcing moved about between Carter and Stromberg CarbShop-Applications ). I've never seen a CFM rating - but given the engines it was fitted to - it is likely to be in the 120-130 CFM range. With two of them you will have perhaps 50% more carb then stock.

So you won't be starving . . .

regards,
stock49

There's really no such thing. Without enough air (what will happen) the vacuum in the carb just goes up, and increases flow above the "rating". The fuel gets too rich.

I agree with Stock49. That should be a decent street set up. As for port size Bill Fisher liked the small port heads for milder street engines. The velocity may drop as the mixture goes form the small manifold into the large port but with stock valves I don;t think it will be an issue.

I too agree that this setup would be a good street setup on your GMC, the small port manifold should give you added air velocity for easy low speed tuning. I always enjoyed driving a jimmy because of the torque, no worry on leaving a stop sign, just let out the clutch and go. There is a thread o the H.A.M.B. with info about tuning the BXOV carbs.

Tim

vacuum is cut with 2 carbs though