w2 rockers ratio

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crazy 340

crazy 340

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friend of mine called me last week end
and we were speaking roller rockers for
his w2 race heads he have and discussion
was going around he told me to have the correct
lift for w2 heads you need to get like 1.6 ratio
instead of 1.5 like OE heads

is it true ???

if so mine are 1.6 so was thinking
I hade more lift that use to

thanks bob
 
I think it has to do with the angle of the push rods.
Not sure, but I have read a little about it.
My 414 with W2's has 1.6 rockers on it. I didn't build the engine, bought it that way.
 
The angle of the lifters and the angle of the pushrods to the rocker is all a bent up Z. You loose lift because it is not a straight shot to the rocker. Thus the correction on the rave blocks to 48*'s.

The 1.6 ratio makes up for it, more or less, because it is lift dependent. The higher the lift, the greater the divide between the old vs. new ratio's.
 
1.6, nothing outside of the rocker set up with proper geometry can change the ratio.

Typically W2 heads use a longer intake push rod to help counteract the angle it runs at.... ummm let's try this lol I'm in Wisconsin, when I angle my 8.5' plow and drive straight it doesn't make an 8.5' path (redneck metaphor)
 
I know they use longer intake push rod
I ran those heads for the last 2 years

how can I know whats the exact lift I got
with the 1.6 ratio

let the redneck aside please
 
hey mike, I'm currently putting together a 420" W2 headed motor. Just wondering what your setup is like. Cam, rockers, intake? What kinda power is it makin?
 
crazy 340 said:
I know they use longer intake push rod
I ran those heads for the last 2 years

how can I know whats the exact lift I got
with the 1.6 ratio

let the redneck aside please
Click to expand...

If your cam says it is a .500 lift, the rotate the engine so the valve is closed and put a dial indicator on the retainer. Set it at .100. As the valve opens. The dial indicators pointer will move towards zero. When the valve starts to close, you should have seen how far the pointer went. Minus that figure from the .100. That figure when a 1.5 rocker is used should be in the low .600 range which would show you not only the exact lift but also how much you loosing from the angles of the tappers and pushrods.
 
crazy 340 said:
I know they use longer intake push rod
I ran those heads for the last 2 years

how can I know whats the exact lift I got
with the 1.6 ratio

let the redneck aside please
Click to expand...

Oh, lobe lift, 0 lash, actual valve lift, do math.... this redneck has W2's and some bigger numbers :)
 
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