Holley 4.3 Manifolds

[Rich Vandervoort]

Yesterday I noticed that Holley now offers a TBI intake manifold for the GM 
4.3 v6.  I called Holley tech to discuss the suitability of modifying this 
intake for use on the 4.3 "vortec" heads.  I was told not to do this because 
this manifold like all other Holley products is optimized for its intended 
usage.  The bottom line was this manifold was designed for the tbi heads 
with their small restrictive ports.  Therefore this manifold shouldn't be 
used with heads that flow significantly better than the tbi heads.  This 
sounded like good advise to me.  After this discussion I noticed another new 
4.3 intake manifold.  The 4.3 MPFI manifold (dual plane) is optimised like 
all other Holley products with a 1000 cfm throttle body.  From my 
unelightened knothole this seems a bit large.

Rich V.
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