Dead old 750 Holley - Resurrected !
CONTINUED:
Here's the shaft in my mill vise. I use .0015 and .002 feeler gauges to keep it level. (within a 1/2 thou anyway)
I generally set the endmill to cut .050 off of the shaft. this will leave a bit over .100 of shaft left.
Glass bead does a great job of deburring.
Fast FWD to completed baseplate. For those of you who haven't had the throttle blades out.. The edges of the blades are tapered to fit the throttle bores, when they are closed. Be mindful of this when reassembling ! Or the carb may not idle correctly and give you FITS.
Next, lets see how it flows ! 876 cfm ! an additional 42 cfm
One thing I always do is, check booster alignment....
Holy smokes Batman! the earth is tilted !!
This is one of the worst I've seen.. The fix is easy. place a tapered punch into the booster, and slowly rotate the booster. (It will slip/rotate on the factory crimp) ...until it is level. Use a center punch to 'steak' the factory crimp, so it doesn't move.
The secondaries received the same treatment, but were not as bad as the Primaries.
A quick flow test showed a 2 cfm loss, Pri and Sec flow. BUT booster signal was raised slightly. 11.5-11.8 Average to 12.2-12.8 average H2o (Dwyer 16" U-tube Manometer)
This is a nice to know gain. More on that later.
Next: lets fix that warpage..
TO BE CONTINUED..
CONTINUED:
Here's the shaft in my mill vise. I use .0015 and .002 feeler gauges to keep it level. (within a 1/2 thou anyway)
I generally set the endmill to cut .050 off of the shaft. this will leave a bit over .100 of shaft left.
Glass bead does a great job of deburring.
Next, lets see how it flows ! 876 cfm ! an additional 42 cfm
One thing I always do is, check booster alignment....
Holy smokes Batman! the earth is tilted !!
This is one of the worst I've seen.. The fix is easy. place a tapered punch into the booster, and slowly rotate the booster. (It will slip/rotate on the factory crimp) ...until it is level. Use a center punch to 'steak' the factory crimp, so it doesn't move.
The secondaries received the same treatment, but were not as bad as the Primaries.
A quick flow test showed a 2 cfm loss, Pri and Sec flow. BUT booster signal was raised slightly. 11.5-11.8 Average to 12.2-12.8 average H2o (Dwyer 16" U-tube Manometer)
This is a nice to know gain. More on that later.
Next: lets fix that warpage..
TO BE CONTINUED..