LT1, Crossfire, etc.., Intake runner lengths and other rambling

[Bruce Plecan]

You can get a cross fire to run mid thirteen's, but it is a fair amount
of work.  One thing I'm tinkering with is running a TBI off of a 749,
and then maybe that on like a Weiand 7525.
  The cross fire is great for slolam  racing, and if mid 13 are fine then
hunt no more.
Bruce


>Gwyn Reedy wrote:
>> I'm curious about the Crossfire setup also.
>> My interest is in mid-range torque and driveability. I have an Impala
with
>> LT1 (or is it LT-1?) and it runs strong, is very smooth, and will pull
over
>> 20 mpg. Also have a number of 60's and 70's vehicles with small and big
>> block Chevy V8 engines and carburetion. They start hard, stumble when you
>> lug them, and get awful gas mileage (but they run fine at WOT). I don't
want
>> roller cams, 8500 RPM, etc., and none of them will ever earn a time slip.
>> Just want to make them as enjoyable to drive as the electronic engines.
>>
>> I'm really curious about the runner lengths on the Crossfire as well as
the
>> TPI. Hope someone will be able to come up with that information. And we
need
>> to compare apples to apples - are you measuring from the intake valve or
>> from the port on the manifold?
>>
>> Tunnel Ram manifolds for carbs (usually sticking through the hood) are a
way
>> to have a ram intake with carbs. (Of course there was the cross ram 2 x
4bbl
>> on small block and on Chrysler 426 Hemi, and do you remember the Dodge
383
>> back in 1960 that had the carbs outboard of the valve covers to get
longer
>> intake ram passages?) I wonder if anyone ever put a 4 bbl on a right
angle
>> adapter mounted in place of the throttle body on a TPI. (If you needed to
>> run a carburetor because of racing rules or something.) You'd get the RAM
>> effect without such a large hole in the hood...
>
>Don't forget the not so lazy slant six from chrysler - good low end due
>to semi-tuned long intake runners necessitated by laying the engine
>down.As for the carb on right-angle adapter on EFI'd engine - it should
>work - have basically the same setup on marine and industrial
>engines.And airplanes put the carb under the engine.
>