f4r/f4s whats the differance?

[cam_hoof]

as above is it poss to put a f4s head on a f4r block, will it loose power? as i bought what was advertised as a f4r head and it turnes out to be a f4s head,
ta
cam

 

[bmh.01]

Well an F4S would be a 2.1 and it doesn't exist afaik.

 

[cam_hoof]

it has f4s stamped on it

 

[bmh.01]

Pics? Must mean something else as an F4S doesn't exist only F4P (1.8 16v) and F4R (2.0 16v).

 

[cam_hoof]

ok will get some pics, i only noticed when the rocker cover looks differant
and then looked and saw f4s on it

 

[lemonnobby]

F4S doesnt exist as said.

 

[cam_hoof]

ok thanks i think i have solved it

 

[BenR]

the 172 head has F4S inked onto it.

If the inlet ports are CNC'd, its a sport head.