I keep seeing different exhaust port spacings for F series motors
I look for F22 and F23 manifolds but find pics of evenly spaced ports (O O O O).
I want the (O OO O) port spacing.

Which f-series motors have the exhaust ports like this (O OO O)
and which ones are like this (O O O O) ?

F22A
F22A1
F22A3
F22A6
F22A7
F22A8
F22B
F22B1 (O OO O)
F22B2 (O OO O)
F22B5
F22B6
F22B8
F22Z2
F23A
F23A1 (O OO O)
F23A2
F23A4
F23A5
F23A7


I dunno maybe everyones swapping on H series heads, which would explain why I see so many evenly spaced ports on F series.

Thanks


Modified by A20A1 at 10:15 PM 1/28/2006

 

the f22a series of USDM motors had evenly spaced ports o o o o
the f22b and f23 USDM motors had uneven ports o oo o

im not sure where you are seeing evenly placed ports...alot of times aftermarket f22b/f23a headers LOOK evenly spaced, but they really arent...also, if you are on a website and you see a pic and its NOT evenly spaced, thats just a sample pic

 

the port difference between early and late year models. The 1990-1993 looks like 0-0-0-0, shown here as the header. The 1994 and later look like 0--00--0 shown as the gasket.
I copy pasted this from F22 parts.com

 

Okay thanks, maybe it's just their sample pics.