Randystys
Member
Hey guys, this is Randy, I have a 66 El Camino, 383 tunnel ram...
I have a post or three on the forum on it with pictures and all the specs, and you guys have real helpful in getting the twin 450s sorted out and driveable...
I just built a new 383 motor for it, all forged internals and clearances for nitrous. Comps NX nitrous Cam and the same tunnel and carb setup that ran just fine on the last motor... Has HEI ignition and I added a MDS 6A box so I could add a retard control... Other than that it's the same setup as my last motor.
Fired right up broke in the Cam at 2500 or so, but when it came time to idle it down... Idles smooth, 17-18" vacuum...right down to 1600...but soon as you got 1500 it drops out dead...boom... No stutter, flutter, choking...just drops dead...???
What might cause this?
I sprayed all around the manifold with starter fluid while it was running checking for vacuum leak no change...?
Thanks in advance for any help
I have a post or three on the forum on it with pictures and all the specs, and you guys have real helpful in getting the twin 450s sorted out and driveable...
I just built a new 383 motor for it, all forged internals and clearances for nitrous. Comps NX nitrous Cam and the same tunnel and carb setup that ran just fine on the last motor... Has HEI ignition and I added a MDS 6A box so I could add a retard control... Other than that it's the same setup as my last motor.
Fired right up broke in the Cam at 2500 or so, but when it came time to idle it down... Idles smooth, 17-18" vacuum...right down to 1600...but soon as you got 1500 it drops out dead...boom... No stutter, flutter, choking...just drops dead...???
What might cause this?
I sprayed all around the manifold with starter fluid while it was running checking for vacuum leak no change...?
Thanks in advance for any help