After my 50's carbs fail I'm wondering if any Y-Blocker have tried a 090470 Holley 470 CFM Truck Avenger off road. They claim it is for 300" engine which won't see over 4500 rpm. I'm not looking to tip one 40 degrees so that claim doesn't mean much. A 390 cfm sound too small even tho I would like the small primaries for milage. 

Stock jetting for the Truck Avenger is 57 with a 25 power valve. The 390 is 51's with a 65 PV.  Looks like both would be pretty economical. Thanx ...JD

56 Vic, B'Ville 200 MPH Club Member, So Cal.

I think a few people here run the 390 moreso on the trucks I would imagine. The 465 seems to be the most popular. Run what ever power valve that suits your driving. Personally I run a 10.5 in my 600.



"Came too close to dying to stop living now!"

I fought a hesitation with a 390 for years. From comments on this site I increased the primary jets to .057 & problem was fixed..

Doing Fords for 45 years. '56 Customline Victoria

E.J. in Havana FL

I would have no qualms running a 390 cfm Holley.  They are/were a spec carb on some NASCAR engines that were spun wa-a-a-a-y over 4500 rpm.  Restrictive?  Perhaps, but they can be tuned to support healthy power levels.  JMO