1.7 roller rockers

[Zarr]

My buddy has a set of 1.7's that he took off his 'stang. Will they bolt right up to my truck or do they need to be shimmed? Just wondering how big of a project its gonna be.

And how much performance do you generally see with the 1.7s versus the stock ones? I'm running a Powerdyne and full bassani exhaust.

 

[RED SVT]

I had 1.7 on my stock heads and i liked them they made a noticable difference make sure they are pedestal mount if they are going on your stock heads....


jim

 

[Zarr]

ttt

no more responses? will these things just bolt right on or do they need to be shimmed?? that is really my only concern.
-zarr-

 

[95Lightning2]

They bolt right down but sometimes you need to shim one or two. There is a method for checking that but I don't remember the # of turns after the pushrod doesn't spin freely, 1 1/2 or something like that. Also, sometimes you have to modify your valve covers so the rockers don't hit. It's all pretty easy though.

 

[Copperhead]

Each application is going to be different. You won't know if they need shimmed, Until you start installing them.

The rule of thumb for most roller rockers is,.............if the proper torque reading CAN NOT be achieved with one full turn(after the slack is taken out of the push rod) then it needs shimmed!

Out of the 16 on my truck,.............I think it was about 7

No big deal though!

 

[greenstang]

I have always went 1/4 to 1/2 turn past zero lash on hyd cams.When I put the 1.7 Crane rollers on my L,I ended up with 1/4 turn on all but 3 or 4 rockers and they were less than 1/2 turn.

 

[mattmor]

Usually with the Crane 1.7 roller rockers. You go to 18lb/ft of torque within 3/4 of a turn. If you have less then a 1/4 turn you need longer pushrods I believe. If you go more than 3/4 of a turn you need a shim. I might have the backwards - its late and I'm tired

Matt Morrison
91 Mustang LX 5.0 - 12.20 @ 116
94 Lightning - 14.7's @ 93

 

[Marshall Werst]

Stock Lightning has 1.7 stamped rockers so the only gain is decreased friction of the rollers....

 

[Lightning Struck]

No..The stock Lightning DOESN'T have 1.7's from the factory.. There was never a stamped 1.7 produced by Ford unless you call the Cleveland rockers stamped(I believe they were 1.72 though)

So the gain is in lift as well as friction(our cam has .414 intake lift with 1.6 rockers, why would they note the 1.6 if it wasn't) The Cobra however used the Crane rocker, which is a 1.7..

So the Lightning's came with 1.6 stamped rockers, not 1.7

 

[RED SVT]

Will i notice a big difference between the two rockers because i have just recently taken off my 1.7s off of my stock heads and im putting 1.6s on my new trickflows ..........??????


thanks jim

 

[WUTNOW95]

hey red...its all in the cam....you can only have so much valve lift....alot of guys will just upgrade to 1.7 to gain more lift on the stock cam or otherwise....the way you find your total valve lift is by multiplying the total cam lift by the rocker ratio....wut im sayin is...get a cam with specs to the 1.6 and your set....your heads are only going to flow so much to a certain lift then it just a waste of lift. and more strain on your valve train..and if you go to much you get to a situation where the valve hits the face of the piston and well..no bueno

 

[Lightning Struck]

The only good thing about having alittle more lift than you're heads can support is that it will spend twice as much time at max lift and such.. But the problem is with a flat tappet that you can't "ramp up" the lifter too fast, and that because a limitation with our lightnings..We have to keep a relatively small amount of intake duration, but we want alot of lift..That causes the cam profile to accelerate/open the valve very quickly. You don't want the lifter to "gouge" the cam.. Roller cam's are totally different beasts however

I would stick with 1.6's and play with the cam..