quote:Originally posted by Rocky:
Here Doug -
In the spirit of Christmas....
Maybe this will help.
(Be Kind!)
Amazon - Tuning Made Easy...
Ah! The Phoenix rises from the ashes!
Actually my pin vise is sitting right here ready to go but it is probably going to be simpler to just switch the carbs out to 1850's?
This setup originally had its own unique carbs made for it by Holley. Both 465's and 600's!
The 465's are repopped but the 600's are not.
These 4180's have annular discharges in the primaries which is also a positive feature over the 1850's.
I need to determine if I can even do surgery on the idle fuel restriction first?
Probably one carb would only be necessary for idle though?
All premature. I need more header temp numbers to compare first.Then idle fuel restriction dimensions.
On standard Holleys they are much easy to enlarge since reducing the size of the air bleed was not intended to be changeable by Holley on them.
For those who are interested, here is the difference in the 4180 idle circuit vs the 4160 and what needs to be done, BUT this thread is about header temps.
It can not be better explained than this is.
This is the Professor preaching Gospel.
http://www.ifsja.org/forums/vb...wthread.php?t=165441
The main reason you go through this is because you want the accuracy of the annular discharge.
You won't believe the difference it makes until you try it, AND I am balancing two Holleys here, vacuum secondaries at that.
There IS a reason for the madness here. 2x4's get real heavy, really fast and I want to keep them clean.
The response the carb with annular discharge is approaching that of fuel injection.
But I digress. Working on header temps still.
Holleys are son of a guns to work on. Weber IDAs are MUCH easier for me.
Warning: go very gently with the taps. They are small and you can break them off in the carb body EASILY. If you do, you will never get the broken piece out. It will be garbage then.
The "truck" carb is more plentiful and much cheaper. Use those rather than the "GT" carb which is getting pricey now.