need HELP going from 1.6's to 1.7's [long]

[JMD Engineering]

Im looking for as much "umph" out of the Trick Flow Street Heat Kit as possible. Its airflow will be going through a Accufab 70mm TB, Pro-M 75 Maf, BBK CAI and exiting through FordRacing Shortie's, BBK O/R Xpipe, and 40series flows. The supporting fuel system will be FordRacing 24# inje., 255 Walbro fuel pump, and a Holley fuel Regulator. Now here's the question:

Running the TFS1 cam, what size pushrods would i need to compliment a 1.7 Roller Rockers (TFS-5140051)? The kit comes with 1.6's Rockers (TFS-51400510), and Chromemoly pushrods with the following specs: 5/16in dia, 6.7in length. I looked up the specs on the Trickflow 1.7's and they have IDENTICAL specs (3/8in stud size, 1.630in max spring dia, .6in slot width.) to the 1.6's. Do i need longer pushrods, or am i alright with the ones that comes with the kit?

Another question - will i have enough ptv clearance? i presume i would. ive seen a 302 with 1.7's on top of AFR 185cc's using stock internals work just fine. i just would like reassurance before i go selling/buying stuff that wont even work.

Jeremy

 

[65ShelbyClone]

You do not need different pushrods for a higher ratio rocker. You should check the rocker's contact patch on the valve tip, though, to make sure the geometry is correct. Its more important to do that with TWs than other heads. For the PTV clearance, I dont know. Get the clay and a set of dial calipers...

I have flat top SpeedPros and had to notch them with my Eddies and cam.