Will the 1.6 rollors help out a good bit, what will the lift of the stock cam be with these. The motor is stock, just a filter and flows. I will be doing a set of 3:73 gears at the same time if you think they will help out .

thanks

 

I can't give any official numbers, but it will be a noticeable gain. I was going to put 1.6's on mine, but it was either go with RR's now or save up some more money and port my heads with port matched intake...which I picked the heads/intake.

 

I think you should do headers first. I have a Camaro Performer mag and it says they gained 15rwhp off of them i think. I would have to check.

 

I wouldn't put the 1.6 rockers on it without upgrading the valve springs.

 

that shouldnt be hard since you have the rocker arms off anyway... though I would do it with a cam.. and do headers first.

 

I 100% agree with shoebox, definitly upgrade the valve springs if you do put on the 1.6 rockers. A lesson learned in my past...

 

maybe i'll do the headers then , because if i do the valve springs then i might as well do the heads and cam to,

I thought the rockers would help it because it seems to die on the top of the rpms, Could the stock valve springs be weak at 80,000 miles and making it lack top end power.

thanks

 

How hard would it be to replace your rockers? Can you get the valve covers off without any trouble? And can you get a spring compression tool in the back of the motor?

 

i put the crane roller tips on my 95 Z and it ran great. there was a definate noticeable change for the better. the only problem i had was the haynes manual and the crane instructions said to tighten the rockers 3/4 of a turn past 0 lash. lt1-edit tells me that is what caused an intermittent flutter at higher rpms. they all set the lock nut at 1/8 turn past 0 lash. i havent taken the covers back off (driver side very easy, passenger side not so easy) to change mine so it coud still be springs. i also put in new push rods. i will re-adjust this weekend. the 1.6 gives you approximately 30 thousandths lift on the exhaust and intake. you figure it out by multiplying the ratio times the lift. 1.5 to 1.6 is about .030. i can post the real numbers if you need it.

carl
dren70@hotmail.com

 

You can do a rocker swap without removing the heads. You will pick up power in midrange and high rpms. Headers will compliment rocker swap.


It's not hard, it can easily be done in an afternoon. Yes, you can get the valve covers without trouible. And yes, you can get at the springs at the rear.

 

Stock valve springs will be marginally close to coil bind with 1.6 rockers. I'd also recommend upgrading the valve springs with something similar to Comp 987s, or at least LT4 springs.

 

i did my buicks with the heads on but how do you do thes with out the valves falling in when you chage the springs.

 

You presurize the cylinder with a constant supply of air from a compresor.

 

What about the lifters on high mileage cars? I thought the springs should not be changed with rockers due to potential collapse.

 

The idea is not to have a significant increased spring pressure, just fresh reliable ones that are much less likely to break from the increased range of motion.
That said, it is possible that if you have a high mile motor and have spent any time at readline, the rollers on your stock lifters may be galled from bouncing but if that's the case your cam aint any better. That's the problem with mods, there is always one more thing that you may, want or have to do.