RAMCTD2003
340dart
I have been building a 74 dart sport that I put a magnum 360 in and I am running into a problem. I don't know if it is fuel or ignition. Let me give you the specs.
1995 magnum 360 block
LA Edelbrock heads w/ stage 2 porting from Mike at MRL
1.6 hughes shaft mount roller rockers.
Roller cam exh 227 @ .050 int. 231 exh.
110 LSA Center Line 106
.530 lift int. .535 lift exh. w/1.5 rockers but I have 1.6 ratio.
Open seat pressure 320 closed seat pressure 140
springs installed height 1.81
Smith brothers push rods
Turbo action 3500 stall converter
8.75 rear with 3.91 gears
MSD 8388 ready to run distributor.
Walbro in tank fuel pump regulated down to 6 psi
AED 750 HPHO carb.
18 degrees initial timing 18 degrees mechanical for a total of 36 degrees
using the blue springs which brings the mechanical all in by 2500 rpm.
The car starts and idles just fine. I can rev it up and it will be clean up through the rpm range. I took the car to the track last week and it ran just fine. Now all of the sudden when I put it in gear and drive down the road it starts to break up above 3000 rpm.
I live at about 4700' here in Colorado so I jetted the new carb down 2 sizes per the recommendation of the AED tech.
Everything on this is brand new. There are maybe 50 miles on this combo.
I pulled my MSD plug wires and measured the resistance on all of them and they checked out according to the spec of 50ohms per foot.
I am running vacuum advance. When I rev it up the advance goes up to 50 degrees.
I have checked everything I can think of and am at my wits end.
Hopefully somebody has some suggestions.
Thanks
1995 magnum 360 block
LA Edelbrock heads w/ stage 2 porting from Mike at MRL
1.6 hughes shaft mount roller rockers.
Roller cam exh 227 @ .050 int. 231 exh.
110 LSA Center Line 106
.530 lift int. .535 lift exh. w/1.5 rockers but I have 1.6 ratio.
Open seat pressure 320 closed seat pressure 140
springs installed height 1.81
Smith brothers push rods
Turbo action 3500 stall converter
8.75 rear with 3.91 gears
MSD 8388 ready to run distributor.
Walbro in tank fuel pump regulated down to 6 psi
AED 750 HPHO carb.
18 degrees initial timing 18 degrees mechanical for a total of 36 degrees
using the blue springs which brings the mechanical all in by 2500 rpm.
The car starts and idles just fine. I can rev it up and it will be clean up through the rpm range. I took the car to the track last week and it ran just fine. Now all of the sudden when I put it in gear and drive down the road it starts to break up above 3000 rpm.
I live at about 4700' here in Colorado so I jetted the new carb down 2 sizes per the recommendation of the AED tech.
Everything on this is brand new. There are maybe 50 miles on this combo.
I pulled my MSD plug wires and measured the resistance on all of them and they checked out according to the spec of 50ohms per foot.
I am running vacuum advance. When I rev it up the advance goes up to 50 degrees.
I have checked everything I can think of and am at my wits end.
Hopefully somebody has some suggestions.
Thanks