Re: IML: (1967, 1968) <--the great debate!

[dardal@xxxxxxxxxxxxxxx]

Quoting Mike Pittinaro <mechimike@xxxxxxxxx>:


> As D^2 says, the larger carb mainly helps at high RPM.
>  Which, if you do have the 2.73 rear, would be at
> speeds approaching 3x the legal limit!  Even I don't
> drive that fast.  Do you have dual exhuasts on both
> cars?

Mike, she probably has the 2.94 as well, but you are forgeting about 1st and 2nd
gear!  You don't have to work on third only!

> > Which do you guys think is faster?
> 
> My 67 is not all stock, and yes, I did lose a race to
> a black 68 LeBaron.  However, I keep insisting the car
> was far from optimally tuned then.  I had only owned
> it for about 45 minutes or so!  
> Since then, I have installed a Carter carb in place of
> the stock Holley, tuned the distributor for optimal
> timing, new plugs/wires, cap/rotor, replaced the tires
> (the old ones were bald from being run at too low 
> pressure), and only used 93 octane fuel.  The car has

Yeah yah yeah, excuses!  He had to retard the timing a hair due to carbon build
up, that's his only real excuse.  Still, the carbon gave him higher compression
for at least a few of his cylinders, which compensated at least parly.  At the
time, his holley was working OK, it was not smoking black or anything, nor was
it too lean.  His car was also not missing at the time, so his new ignition
parts would have made little difference if he had them during the race.

Face it Mike, D^2's Imps rule, at least in terms of speed!  :)


> Personally, I think the 68's may be a touch faster
> (when stock, not with some crazy cam!) over 3500 RPM
> or so due mostly to the heads, with the 67 being the
> torque monster around 2500-3000.  I have never come

The larger exhaust valves will help all speeds, but yes, mainly upper rpm range.
 The smaller exhaust valves will not give you any benefit at all.  May be
smaller intake valves could have helped low rpm by increasing mixture
atomization and mixing, but these are identical for both heads.

However, all these 440's were very strong compared to the competition.

> close to exploring the top end of my car.  The needle
> will bury at 120 with ease, and there's still plenty
> of pedal left.

According to a road test, the stock 67 (single exhaust, draggy bias ply tires)
was capable of a true 125 mph.  Mike's car with duals and radials will certaily
reach 130, probably more.

D^2, 2x68



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