Update on 216 to 261 engine switch

[Bob Carriere]

Geez for a minute I thought you were breeding the little suckers...

Mechanical husbandery..????

Back to the real world...

My 1958 GM truck manual says the carb should be 7005140

for the 235 for the 261
7004468 7005140

Throttle bore 1 9/16 1 11/16
Main Venturi 1 11/32 1 15/32


The above carb part numbers checks out against the parts GM manual for 1958-59-60. Carb kit for the 261 is 7006126....

Will need to measure up a real carb for the bolt pattern spread but the 261 carb is just big enough it will not bolt on a 235 manifold and vice versa.

Both the 235 and the 261 are referred to as the Rochester "B" type.

There are some after market circa 1959 Zenith and Carter Y that was used on these engines and somewhat preferred by certain mechanics.

Keep us posted of developments.

Bob