>Darren,
>
>Don't bother with the 1500 receipts, just pull the air cleaner off and read
>the model and list numbers off the air horn. If it's a spreadbore carb, you
>don't need an adapter for the Performer manifold.
>
>Patrick
This posting reminds me of something that I was recently told by a
speed shop in Albuquerque (Yearwood). I was asking about the
Performer manifold and the use of the 2 barrel Holley Projection TBI.
He asked how I had my TBI hooked up now to my stock GMC manifold and
I indicated that I was using an adapter plate with a relatively
square hole in the center. He pointed out that my 6 year old plate
was different that some that he now has; however, he pointed out that
since my stock manifold has the two small holes in the front and the
large holes in the rear and that the two barrel TBI system has two
large holes that must be mounted forward to prevent fuel starvation
to the front cylinders; therefore the adapter plate that must be used
is like the one I have and it has an open center so as to allow flow
to both the front and rear holes of the stock manifold.
However, he said that it has been determined that by having the
center of the adapter open the engine will get cross flow from each
injector of the Holley (left to right). He claims that this will
result in less torque at lower speeds and that it will shift the
torque curve to a higher rpm which is not what a motorhome needs. He
said that his fix is to cut a small vertical groove at the front and
rear of the adapter plate in the center and to slide a small steel
plate into the groove so that it separates the left and right
injector banks. The width of the plate is equal to the thickness of
the adapter plate. He said it doesn't have to be welded or epoxied
because it will be held in place by the stock manifold below and by
the TBI bottom plate from the top.
He claims that any of us using this type of setup (Holley or Howell)
should improve our performance with this fix.
If am going to do it after I get the rest of the things done to solve
my recent vapor lock problem and will post results when it is tested.
Emery Stora
77 Kingsley
Santa Fe, NM
>
>Don't bother with the 1500 receipts, just pull the air cleaner off and read
>the model and list numbers off the air horn. If it's a spreadbore carb, you
>don't need an adapter for the Performer manifold.
>
>Patrick
This posting reminds me of something that I was recently told by a
speed shop in Albuquerque (Yearwood). I was asking about the
Performer manifold and the use of the 2 barrel Holley Projection TBI.
He asked how I had my TBI hooked up now to my stock GMC manifold and
I indicated that I was using an adapter plate with a relatively
square hole in the center. He pointed out that my 6 year old plate
was different that some that he now has; however, he pointed out that
since my stock manifold has the two small holes in the front and the
large holes in the rear and that the two barrel TBI system has two
large holes that must be mounted forward to prevent fuel starvation
to the front cylinders; therefore the adapter plate that must be used
is like the one I have and it has an open center so as to allow flow
to both the front and rear holes of the stock manifold.
However, he said that it has been determined that by having the
center of the adapter open the engine will get cross flow from each
injector of the Holley (left to right). He claims that this will
result in less torque at lower speeds and that it will shift the
torque curve to a higher rpm which is not what a motorhome needs. He
said that his fix is to cut a small vertical groove at the front and
rear of the adapter plate in the center and to slide a small steel
plate into the groove so that it separates the left and right
injector banks. The width of the plate is equal to the thickness of
the adapter plate. He said it doesn't have to be welded or epoxied
because it will be held in place by the stock manifold below and by
the TBI bottom plate from the top.
He claims that any of us using this type of setup (Holley or Howell)
should improve our performance with this fix.
If am going to do it after I get the rest of the things done to solve
my recent vapor lock problem and will post results when it is tested.
Emery Stora
77 Kingsley
Santa Fe, NM
