The Ford Barn - View Single Post - Cyl Heads-Navarro vs Edelbrock or Offenhauser

JWL · 05-18-2019, 08:47 PM

If you recall I covered the installation, with pictures, and sealing issues associated with crankcase vacuum pumping, in my book. I do not recommend for long term use unless lower vacuum levels are set or there are modifications made to deal with wrist pin problems.

Picking up 20 HP is something we can all wish for but is rather optimistic. Of course I have only examined and tested the results on 4 different Flathead engines with a maximum gain of about 6 HP. It is possible to get a 15 to 20 HP improvement with wet sump overhead valve engines. Most dry sumps do not need additional vacuum pumps.

05-18-2019, 08:47 PM	#38
JWL Member Emeritus Join Date: May 2010 Location: Fitzgerald, Georgia Posts: 2,204	Re: Cyl Heads-Navarro vs Edelbrock or Offenhauser If you recall I covered the installation, with pictures, and sealing issues associated with crankcase vacuum pumping, in my book. I do not recommend for long term use unless lower vacuum levels are set or there are modifications made to deal with wrist pin problems. Picking up 20 HP is something we can all wish for but is rather optimistic. Of course I have only examined and tested the results on 4 different Flathead engines with a maximum gain of about 6 HP. It is possible to get a 15 to 20 HP improvement with wet sump overhead valve engines. Most dry sumps do not need additional vacuum pumps.