Original Carburetor Size for 454

[HotRodPC]

Mechanical secondaries are great for manual transmissions and properly set up automatics, but they aren't very good for mpg at all.

 

[jake wells]

the original rochester would have a divorced choke this would be a direct replacement http://www.ebay.com/itm/JET-Rochest...Parts_Accessories&hash=item5ae8df7b4a&vxp=mtr

i had a holley on my prev truck and it always blew the power valve so just make sure your power valve isn't blown or you will get crappy fuel economy.