1.7 RRockers on TFS setup

[JMD Engineering]

Just wondering if there would have to be any mods i would have to do to run 1.7 Roller Rockers with my TW heads. I have the trickflow 1.6 RR's that comes with the kit, but - i was wondering if its worth the swap, HP wise. Do i have to get different size pushrods, or are the hardend ones that come with the kit long/strong enough ? I was thinking of the Crane 1.7RR's

EDIT: Running a TFS Stage 1 cam. Specs as follows.

TFS-51402000
Valve Setting Intake: .000 in.
Valve Setting Exhaust: .000 in.
Advertised Duration (Degrees): 275 intake/279 exhaust
Duration at .050 in. Lift (Degrees): 221 intake/225 exhaust
Camshaft Lift: .312 in. intake/.319 in. exhaust
Valve Lift with 1.6 Rocker Arms: .499 in. intake/.510 in. exhaust
Lobe Separation (Degrees): 112
Intake Cam Timing at .050 in. Valve Lift:
Opens 3 degrees BTDC
Closes 38 degrees ABDC
Max lift: 108 degrees ATDC
Exhaust Cam Timing at .050 in. Valve Lift:
Opens 49 degrees BBDC
Closes 4 degrees BTDC
Max lift: 116 degrees BTDC

 

[Dbeck002]

This is a tough question because it depends on your cam too..

Since the TW heads have oversize 2.02 valves the odds are against you if youre running a cam with some lift and more duration. I'm not sure what happens with the pushrod length, this has to be checked with a pushrod length checker available at summit.
Tell us what cam you will run.



And hp wise you will notice a gain with 1.7s because the heads naturally flow better as soon as you bolt them on.

 

[Dbeck002]

I think you should be ok on the clearance...


But this is my opinion, the only way would be to borrow a couple 1.7 RR and install them over a with the right pushrod, turn the crank and make sure it doesnt tap.

But if i had to guess id say it would clear.