i am running a 350 and i will soon be installing a modifyed TPI setup. the TPI has a ported edelbrock base, ported SLP runners, ported plenum, 52mm throttle body, 24lb/hr SVO, 730ecm, accel ignition
componets, S/R torqure heads, and DynoMax headers with 2.5" exhaust.
the motor has a four barrell on it now that runs strong but gets poor gas milage.
the cam that's in the motor now is a recently installed comp cam XE268H-10.
it's durration at .05 is 224/230.
lift with 1.5 ratio rockers is .477/.480
lift with 1.6 ratio rockers is .509/.512
lift with 1.65 ratio rockers is .525/.528
lift with 1.7 ratio rockers is .541/.544
what ratio rocker should i run on the ported TPI setup???
i want to buy the parts soon so any advice
would be greatly appreciated

 

I just checked on the flow numbers for the World S/R Torquers and I would go with the 1.6RR. I don't know how that cam is going to work out. The duration at .050 seems a little big for your application and parts. TPI is good to maybe 5000RPM or so.

If you had the money I would install a roller cam and lifters and get something like the LT4 Hot Cam or maybe a Comp Cam 268HR. Another option is the ZZ4 with 1.6RR on the intake and 1.5RR on the exhaust. The ZZ4 cams can be had brand new for $100 on Ebay. Then you would have to buy the special rollers.

 

Nothing above 1.6 - over kill.