Carb spacer input required

big2bird

Charter Member, Founder Bird-Run, Cruise-In Bird-R
Joined
Mar 5, 2008
Messages
5,719
Location
Anaheim, Ca.
Scott wants me to add a 1" spacer to his set up. It is a 400HP 350SBC.
With this dyno sheet:
BowkerDyno0001.jpg
And this 750 DP holley carb
PICT0009-22.jpg
And this Edelbrock dual plenum manifold.
PICT0008-23.jpg
Which of these spacers (Inserts)would give the best benefit?
PICT0007-28.jpg
I was leaning towards the open spacer, but now am thinking the 4 holer would be better.
 
Same AutoZone spacer that I bought.... it keeps the drop base air cleaner bottom from hitting the wire boots on the distributor, other than that I have not noticed a difference between open, 4 holes or no spacer..... oh yes, my wallet is $20 lighter.....
:huh::bounce::eek:
 
After discussing it with Lars, I believe I am going to use the 4 hole setup. It would appear the open spacer would do more harm than good with a divided plenum. Unless Scott wants to run above 7,000RPM. :nuts:
 
Bird can't use it because he has a dual plane, and they won't fit on a single plane with a divider. They're for specific manifolds and each one is different but since it's called the turtle I thought I'd mention it here. Who would have thought, a performance upgrade called turtle :D Jim may have something going for him afteral :1st:

I never used one, read about it some time ago.
 
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