Greg K
07-04-2003, 08:19 PM
As previously posted, we tore out the 454 and replaced it with a brand new 502. Here are the results below with pics.
It turned out my carb was not an 850 cfm, but an 800 cfm carb. My neighbor who builds engines for Hendrick Motorsports took my carb to go thru it. They honed out the main carb body and air horns, replaced the carb base with an 850 plate, modified the idle circuit on the base plate to fit the carb body, new matched metering blocks and power valves. New high flow squirter screws. Modified the primary and secondary to a 1:1 opening rate, which opens all barrels at the same rate. Matched the accelerator pumps. All this with four corner mixture screws and dual idle adjustment on primary and secondary sides of the carb. The throttle plates are now stainless and the throttle shafts are a low profile about half the diameter of stock shafts. Floats in bowls were changed out to the ones they use for road course racing. The choke was also removed form the carb. One J-tube broke while moving it out of the way, but no biggie really. I was surprised at all the little things my neighbor did and how different the carb appeared after all the modfications. The results is a very responsive and very tuneable. Underneath the carb is an Edelbrock RPM Performer Air Gap intake.
http://www.donzi.net/photos/gregkcarb1.jpg
http://www.donzi.net/photos/gregkcarb2.jpg
Below is the look of the new engine before we primed and set the distributor in and after we fired it up with everyhting in place except mounting throttle cable to carb. Fired up on the first turn of the key :D
http://www.donzi.net/photos/gregk502-1.jpg
http://www.donzi.net/photos/gregk502-2.jpg
It hits the water tomorrow morning with a new prop for some initial break in on the water for a couple of hours.
Along with a new shift cable down the to the King Cobra while we had it off and replaced the bellows too.
No cuts, bruises or fingers were lost in the process of changing it out.
Plenty of oil pressure now! And Griz, I did set the timing with a timing light, so I'm not a D%!* head anymore!!
It turned out my carb was not an 850 cfm, but an 800 cfm carb. My neighbor who builds engines for Hendrick Motorsports took my carb to go thru it. They honed out the main carb body and air horns, replaced the carb base with an 850 plate, modified the idle circuit on the base plate to fit the carb body, new matched metering blocks and power valves. New high flow squirter screws. Modified the primary and secondary to a 1:1 opening rate, which opens all barrels at the same rate. Matched the accelerator pumps. All this with four corner mixture screws and dual idle adjustment on primary and secondary sides of the carb. The throttle plates are now stainless and the throttle shafts are a low profile about half the diameter of stock shafts. Floats in bowls were changed out to the ones they use for road course racing. The choke was also removed form the carb. One J-tube broke while moving it out of the way, but no biggie really. I was surprised at all the little things my neighbor did and how different the carb appeared after all the modfications. The results is a very responsive and very tuneable. Underneath the carb is an Edelbrock RPM Performer Air Gap intake.
http://www.donzi.net/photos/gregkcarb1.jpg
http://www.donzi.net/photos/gregkcarb2.jpg
Below is the look of the new engine before we primed and set the distributor in and after we fired it up with everyhting in place except mounting throttle cable to carb. Fired up on the first turn of the key :D
http://www.donzi.net/photos/gregk502-1.jpg
http://www.donzi.net/photos/gregk502-2.jpg
It hits the water tomorrow morning with a new prop for some initial break in on the water for a couple of hours.
Along with a new shift cable down the to the King Cobra while we had it off and replaced the bellows too.
No cuts, bruises or fingers were lost in the process of changing it out.
Plenty of oil pressure now! And Griz, I did set the timing with a timing light, so I'm not a D%!* head anymore!!