fast7series

are the s4 n/a and s5 n/a rotor housing the same? I know rotors are different.
are housing interchangable?

the same for TII?

last question is if we can use s4 n/a rotors to go with s5 housing/irons. I know that people use s5 n/a rotors for TII rebuild

thanks

farberio

iTrader: (7)

S4 and S5 housings are not the same. For S5 they moved one of the spark plug holes, but I don't remember which atm.

You cannot mix S4 and S5 housings, but you can use two S5 housings on a S4 block or two S4 housings on a S5 block.

This is the same for TII as well, but there are a couple more steps when you try to change the housings from N/A to TII or visa versa.

anarchyb52

iTrader: (13)

The na has a baffle like defuser in the exhaust port. The na also doesnt have holes drilled for coolant to flow into the lower intake manifold for the turbo water feed.

Banzai-Racing

iTrader: (11)

This should help http://www.banzai-racing.com/faq_housings_ID.htm

fast7series

thanks for the information. so, I guess that I can use s4 n/a housing and s5 n/a irons to build an engine for s5 n/a car, right? without much problems like swapping s4 n/a block into a s5 n/a car.