481 chevy tune

new motor,bbc 481

blown,14-71littlefield,50%over

58s all in injector

what port jets? what main jet?

 

call fred 905-384-0675. he can answer any questions. jon

 

go to spud millers site it is fuel injection enterprises he has a tune-up section which you can enter your combo and look at the results and pressure at the nozzles i run a 555bbc and my hats are 44s but i have 4 in the back of the blower case with 25 nozzles in them. and my ports are 52s 50 48 46 front to back.

 

Lots of opinions,..........

How many nozzles do you run/have in the hat?

I also run a RODECK 481, "T" version, with 557 cu". At one time, long ago, I ran 16 nozzles in the hat. Now, with the High-heliz, retro, 14-71 set-back blower....I run 6 nozzles in the hat, 2 in the blower itself and then installed port nozzles. The alcohol fuel system was set-up, installed and flowed by Jim Rehfeld at Enderle, Simi Valley, Ca.

 

8 hat

8 port

went to fuel site + says need .018 main sonds small ?

 

have similar set up. 50 percent mite be getting up there with that big blower if that BBC is a real steel BBC. Not sure you can be advised without knowing gpm?

 

Yes,....need to know more.

Whose Injector are you using?

What/Which Injector model/size?

What pump are going to use?

 

pump is 17 gpm

alloy buzzrd

brooks rods

calliss crank

ross piston

thanks all

 

Hello.........

 

what main you guys run

 

Rodschevy Check Your Pms

 

have sent e mail thanks

 

Sea level try hat average.044 port average.053.
port check 20#
main .075
1st high speed .070 @ 65#
2nd high speed .050 @ 115#
blower 40% or 39#
25 deg timing mag 44
30 to 34 mag 10 12 20 or mallory 3 or better
(single mag )

 

Sea level try hat average.044 port average.053.
port check 20#
main .075
1st high speed .070 @ 65#
2nd high speed .050 @ 115#
blower 40% or 39#
25 deg timing mag 44
30 to 34 mag 10 12 20 or mallory 3 or better
(single mag )



thanks for tune forgot to add is standard helix charger.1471

 

Sent you nozzles sizes in an e-mail, but it came back.
Sorry to take so long to get info to you.....you probably have had a dozen or so responses by now.

Port Nozzles:

Cyl #1 = #52 Cyl #2 = #56

Cyl #3 = #50 Cyl #4 = #50

Cyl #5 = #48 Cyl #6 = #48

Cyl #7 = #46 Cyl #8 = #46

Injector/Hat Nozzles:

Nozzles: 6 @ #50

Blower Case Nozzles:

Nozzles: 2 @ #50

NOTE Until you are sure what you want to do with the "High Speed",...leave it alone or blocked off....we use a #70


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