The Ford Barn

F1 Flathead · 05-23-2010, 06:56 PM

I'm running a mostly stock 40 Merc flathead with a mild cam in my 29 roadster. I'm running stock exhast manifolds with a just a short, 3 foot open pipe on each side. The engine missfires at high rpm. I've gone through the ignition and am now thinking I need to richen up the jets a bit. Can someone recommend a jet number for me? Also, I'm just running the holly powervalve that comes in the standard kit. I remember reading that it is not really correct. I've forgotten which of you has the proper powervalve available for that carb. Can you let me know? I know this was all available on the old Fordbarn but I didn't find anything when I searched this new setup.
Thanks guys!
Dan

05-23-2010, 06:56 PM	#1
F1 Flathead Member Join Date: May 2010 Location: Brighton Michigan Posts: 47	Holly 94 jet recommendation for a flathead running open exhaust? I'm running a mostly stock 40 Merc flathead with a mild cam in my 29 roadster. I'm running stock exhast manifolds with a just a short, 3 foot open pipe on each side. The engine missfires at high rpm. I've gone through the ignition and am now thinking I need to richen up the jets a bit. Can someone recommend a jet number for me? Also, I'm just running the holly powervalve that comes in the standard kit. I remember reading that it is not really correct. I've forgotten which of you has the proper powervalve available for that carb. Can you let me know? I know this was all available on the old Fordbarn but I didn't find anything when I searched this new setup. Thanks guys! Dan