"Oops! I guess I should have checked the Tigers United site and read the
original LAT option brochure...
..." Another interesting sidelight is that the illustration is NOT the
Edelbrock manifold, which has dual slots, not 4 holes. This is probably the
previous "TIGER" lettered artwork, of the Shelby/Benevides design, that has
been "touched up" with the "Edelbrock" signature logo and the "F4B".""
The original version of the Edelbrock F4B manifold had four holes and not
two slots. The two slots were added after it was found to add 15 HP over the
four hole model. Gordon Chittenden's book "Performance Tuning the Sunbeam
Tiger" has a photo of the four hole version and has another photo with two
slots (pg 111 & 112) and the caption said a machine shop did the work.
Edelbrock incorporated this change in later versions of the F4B. I have a F4B
that has this slot and it was cast that way.
Another change that Edelbrock did to the Performer RPM, which is the updated
version of the F4B, is to cut a hole in the divider of the two slots. I
think this is supposed to equal out the air pressure between the two manifold
planes thus making more horsepower. My F4B doesn't have this opening and as
far as I can tell they never had this modification.
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