<VV> 140 power increase

[Brent Covey]

#1

rejet carbs 53-54 primary, 50 secondary- run secondaries 3 jet sizes smaller
than is the best match on your primaries- use accelerator pumps in all four
carbs and remove/deatcivate secondary lockout provisions if present. Ideal
jetting will vary with altitude (leaner as you gain altitude) and local fuel
availiblity but 53 in the primaries is usually a good starting point.
They're likely 49-51's now. The single largest change in performance and
response is larger jets.

Set choke unloader to half an inch and carefully set up the vacuum break and
float drop adjustments.

#2

find an effective vacuum advance unit that is responsive without causing
part throttle ping (and requiring setting initial advance retarded from
*ideal* in compensation) - this usually requires trying a couple different
units out to pick the most complimentary of the ones you have availible

Sometimes you'll find the 95 HP distributor (all out at 4200 instead of 2800
rpm) is a good match permitting a low intial lead setting and it catches up
the difference at higher rpm.

#3

3872304 camshaft if you have an RB, RM style 'normal crank" engine, 3839889
('95hp" cam in engines with the RN type crank with special offset crank
gear) otherwise.

#4

balance the rotating group parts, some GM engines have a 20 gram spread in
piston assemblies.

The 140 is a pretty zoomy engine, not much different than the L79 350HP/327
for general attributes when its running good.

Good luck!
Brent Covey
Vancouver BC