Max -
It sounds to me you have either a timing/distributor problem or a problem
with the Carbs.
If your timing is off, it won't combust properly when under load.
Go through your complete tuning procedure.
Alan
On Tue, Apr 5, 2011 at 9:42 AM, Maurice Maxwell <maxandreb1 at yahoo.com>wrote:
> After replacing a head gasket and all of the other gaskets in the kit and
> having
> the head rebuilt. I tuned the car and it drove around town just fine.
> Steady
> idle, smooth power. However, on the highway, there was a serious misfiring
> at
> about 4000 rpm when the throttle was fully depressed. When the gas pedal
> was
> slightly released the smooth performance returned and the car continued to
> accelerate on to 5000 rpm. I find this to be strange and I need help
> figuring
> this out. The car did this in 3rd, 3rd o.d., 4th, and 4th o.d. It did
> accelerate on to 5000 rpm in each gear when the pedal was not quite on the
> floor.
>
> Thanks for your help in advance,
>
> Max
> 1961 BT7 MkI
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