Question from my boyfriend...

[bopate]

He has a 93 5.0 and is looking for advice on an X 303 cam with 1.7 roller rockers with GT40 heads. Should he buy 1.6s or 1.7s? The valve reliefs are big enough for the 1.7s

 

[Steven]

1.6's. GT40 heads don't flow enough at that high of a lift, so in reality the lift would be best kept lower in order to take advantage of peak CFM at the upper rpms

 

[bopate]

Will it help enough if the heads are being ported?

 

[rz5.0]

1.6 on the intake 1.7 on the exhaust.. Doubt he wasn't to spend that..

 

[Musturd]

Like Rz said that's how my cars setup only reason I did it is I found a spare set of rockers for cheap

 

[OnyxCobra]

with the right cam you don't need to mix and match rockers.

 

[white95]

Is this with the stock pistons?

 

[bopate]

No not stock pistons.