[FC] differential gears

[Robert Marlow, Vairtec Corporation]

Phil, you have received a number of responses recommending the 3.55 
final drive.  Theses recommendations are correct.

There are reasons that Chevy switched from the 3.27 to the 3.89 somewhat 
early in the FC's production life, and similarly, there are reasons that 
Chevy switched to the 3.55 when the 164-cid engine was introduced.

My favorite of these reasons, for the switch from the 3.27 to the 3.89, 
was expressed by Larry Claypool many years ago:  The 3.27 "made 
mountains out of molehills."

Your engine as described will of course pull the 3.27 ratio better than 
the original 145-cid engine did, but with your engine, the 3.55 will 
best meet your needs and desires.

--Bob

On 3/11/2018 6:39 PM, Phil via Corvanatics wrote:
> I have a tech question,not sure if i asked this one before,but ,here it is,i have a 1962 corvan,I putting together a 110 HP 65 FC motor ,iam running a 260 cam,60 over pistons,iam not making a race van,just alittle peppie,I have have 205 x 14 tires,i want to dirve on freeway,not 80,but 60-70 MPH,and I want to keep RPM down to a reasonable RPM,and I don't want to chug around the city ether,i have a set of 355 gears and a set of 327 gears,before I install these gears,i want to make sure iam using the correct gears,i know everyone has there own opion on a set of gears to ues,but ,I just want to drive the family around town and on freeway,without overheating motor,thanks everyone for your info......