I am going to put roller rockers on my 180 AFR heads and was wondering the diffrence between the self-alining(badspeller) and non other than the obivous. Also what would I need a stud gridle for? I am looking at the Harland Sharp 1.6, are these self or not? Do I need a stud gridle or not? Thanks For all the help!

 

I have AFR 195 heads on my engine, I am running Comp Cams 1.6's w/ no problem at all. You do not need self aligning rockers. Your heads should have screw-in studs and guide plates. Hope this helps.

------------------
1986 IROC, fully loaded, Mini Ram'd 383, Art Carr 700R4, Accel DFI, 12 bolt rear, etc, etc......

 

Thanks a lot and yes it helped, lol

 

Did you have to use tall valve covers or were you able to use the stock ones?

 

on a vortec headed crate engine, can i run 1.6 rockers? just thought i'd ask. thanks, also, i dont quiet understand the ratio stuff, so if someone could explain what the difference between 1.5 and 1.6 and why it adds horsepower it would be appreciated. thanks

 

I am not sure if you can run 1.6's on Vortec heads without having to elongate the pushrod holes to keep the pushrod from rubbing. By going from 1.5 to one 1.6 rocker arms you add about.032 lift to your cam. It opens the valve up a little bit furthure leting more air and fuel in and making more power.

 

The ratio is the result of the difference between lift at the valve divided by lift at the camshaft lobe. All SBC camshaft's advertised lift is based on a 1.5:1 ratio - unless specifically noted otherwise(as in the LT4 camshaft which is designed for a 1.6:1 ratio).For instance a camshaft that has advertised lift of 0.450" at the valve has only 0.300" lift at the lobe. To determine how much additional lift you will gain by going to a higher ratio: divide the advertised lift by 1.5, and multiply the result by the higher ratio. For instance: if the advertised lift is 0.450" and you want to see how much lift you will get with 1.6:1 rocker arms -
0.450/1.5 = 0.300
0.300 x 1.6 = 0.480"

For stock cams under 0.450" lift, it is debatable whether the increased lift from higher ratio rockers will make enough hp to justify the cost. You may pick up some additional hp by using roller rocker arms, as they reduce some of the frictional losses in the valve train.

 

on a vortec headed crate engine, can i run 1.6 rockers?

depends on two things:
1. what is the maximum rated lift of your valve springs - if your springs are only rated to 0.475" lift and the 1.6 rockers give you 0.480" lift, the coils will touch and the springs WILL fail.
2. how much piston-to-valve clearance do you have. this is usually more dependant on camshaft duration but increasing lift may cause problems. the minimum piston-to-valve clearance should not be less than 0.100" on a street engine.

 

I had to run taller valve cover to clear my RR's. But, I saw some valve cover spacers in JEG's the other day, those might work for you if you are running preimeter bolt valve covers.

------------------
1986 IROC, fully loaded, Mini Ram'd 383, Art Carr 700R4, Accel DFI, 12 bolt rear, etc, etc......

 

I was told you have to use a narrow body rocker with center bolt heads. Is this true or is my parts dealer just trying to scam me in to buying the more expensive rockers.

 

I think it depends on the brand of rockers. Some companies make all of their rockers narrow enough to clear the supports of the centerbolt valve covers. Others don't and then advertise the centerbolt compatable rockers under a different part number. I don't have extensive rocker experience from differtent companies, so I can't say who makes rockers that clear, but doesn't advertise them as such.



------------------
Joshua Johnston
1991 Z-28


350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust,Dynomax Bullet Mufflers, T&R Motorsports custom air intake

 

Yes, on ceter bolt valve heads, most companies offer a narrower roller rocker, some come that way no matter what style you get.

And if you have guide plates, DO NOT use self aligning rockers. You will be trying to align the rockers two different ways at two different spots.

This can definitely cause a pushrod failure.

------------------
13.3 @ 101.3MPH 95 degrees and 95% humidity w/ no tuning on motor

Sportsman II, Gear drive, Perf. Res. chip, SLP 1 3/4" headers, Edelbrock muffler, Trans-go stage 3, Vigilante 9.5", Functional Ram Air hood, SLP roller cam, 24lb ADS injectors, AFPR, 3.45 gears, Stealth intake, 58mm setup, Spohn suspension, and other goodies...


raven

Custom EFI Intake Setup

 

I agree with that...my 190s also come with their guideplates and they specifically say to use theirs only. Just be sure to use HARDENED pushrods with the guideplates or else you'll wear out your pushrods prematurely.




------------------
1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'