1.7rr on stock long block?

[stanglover0526]

i just picked up my new project a 91 gt and its completely stock. I dont know much about 5.0s as ive had the 4.6s. My buddy gave me a set of crane 1.7 rr and i tried installing them last night and the bolt was just a little to big for my stock head. Could i go to the hardware store and get some grade 8 bolts that are the rite size? Or is there something special about the bolts that came with them? Any help is greatly appriciated!

 

[apollo12]

Did he give you all the hardware or just the roller rockers? If not you will need to order the crane kit to install the rockers

 

[stanglover0526]

yes he gave me all the hardware its just that the bolts dont thread into my stock heads

 

[stykthyn]

are they pedestal mounts or shaft style?

 

[stanglover0526]

they are pedestal mount i beleive they are original 93 cobra rockers

 

[SpartaPerformance]

I don't think those would fit on a stock head, the Cobras had GT-40's

 

[Chrome_Rust]

i had 1.7's on e7's in my first engine that was in the 93. i bought some different bolts and they went right on no problem.

 

[stanglover0526]

did you notice any chance with rockers on the stock heads? People say it can float the valves. What harm can this cause?

 

[Mustang5L5]

You are prob not gonna notice a thing with stock heads and intake and cam.

If your springs are original and 100K, putting on a 1.72 might increase the chance of floating a valve.

Honestly, i'd either mothball them til you get more mods...or sell them to finance better mods. 1.72's aren't a typical mod for stock 5.0's.

 

[Chrome_Rust]

my valves started floating aroung 5800.... I didn't care as I was changing the engine anyway. I shifted that car when it stopped pulling. Upon tear down I had ringlands in 4 cylinders that were destroyed....