Re: Holley Pro-Jection for a 258?

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: farna@xxxxxxx
" 
" The max recommended carb for a 258 is 500 cfm, and a 500 2V has a
" little trouble idling smoothly. I wouldn't put one that size on a
" stock 258 unless it was a 4V (there is a 450 4V made -- I think
" by Carter). The most common 4V used on a 258 is a 390 cfm Holley
" though. Holley recommends their 390 for a mild 300, 600 for
" "hot", and 650 for full race. "Hot" includes a high stall
" converter, aggressive cam, and deep gears -- a street/strip
" bracket racer.

holley makes the 450, a stock replacement for small early-'60s ford
v8s - 260?  289?.  it has a thermal choke, unlike the #o-8007 390cfm.

carter [and edelbrock] made a 400 as well as 500 and 600 cfm.  i don't
think you can find them new anymore, but recon/rebuilt 400s should be
somewhere.

-but-

most carbs - including carter 4bbl and holley 2bbl - are rated at 1.5"
pressure drop, but holley rates their 4bbl at 3" pressure drop.  so -
flow ratings aren't -directly- comparable.

i agree with frank's argument on size.  300 should be fine for a
vanilla driver; 400-500 should cover anything you'd call streetable.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen

adh@xxxxxxxxxxxxxxxxx                       and think what none thought