installing 1.7 roller rockers
 

When I replace my 1.6 with the 1.7's will I need to get a different size pushrod, if so what size.

No,Ive got 1.7s and have had no problems with the stock length rods.If they are pedestal mount,shims would fix any problems with setting the lash on the rocker.

I don't think they fit under the stock valve covers though.

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1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, Super Competition Hooker Headers, 2 1/2 in. mandrel bent cat back, High Flow H-Pipe, Pro 5.0 Shifter, 16* Timing Advance

yes they will fit, and no you dont need new pushrods, like said before they come with shims to make up differences in length to get them torqued properly, you will have to remove or modify the oil neck baffle on the passenger side valve cover though so they wont hit it

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88 Notchback 5.0, 3.73's, Explorer intake, pulleys, Crane 1.7's, BBK headers, off-road H-pipe, flowmasters, subframe connectors, 65mm TB, shift kit, March ram air kit, motorsport wires, MSD coil, upper and lower control arms, 155lph fuel pump, cheap 2800 stall, Crane Adj.FPR, best time- 13.99@99.75, not yet tested times after rocker and intake install