I'm replacing the heads on my 351, and while I'm in there I thought I would replace/upgrade the valvetrain. I'm wanting to put in a set of 1.7 ratio rocker arms.
My question is, will these work with factory valve covers? If not, what aftermarket applications has anyone else had luck with?
Thanks,
-Steve

 

The 94-95 Cobras came with Crane 1.7 roller rockers so those valve covers may work. I'm told on Mustangs at least that the stock valve covers can be made to work with a little massaging. The baffles may need to be trimmed, the cover dimpled, etc. On my 'Stang I went with aftermarket Trick Flow valve covers (Summit part # TFS-51411801) because they are somewhere between stock height and tall valve cover height. I did have to use a 3/8" spacer between upper and lower manifolds and extend the egr tube.

 

I was looking into these too.

Do they add to the high rpm HP at the cost of low RPM torque?? If so, they don't sound like a good idea for a truck.