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 Post subject: roller rockers
 Post Posted: Fri Apr 21, 2006 1:31 pm 
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can you by any chance run a 1.7 roller rocker on a small block chevy?the reason i ask is a buddy has a brand new set of crane full rollers never been out of the box he is going to give me..so i was wondering thanks


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 Post Posted: Fri Apr 21, 2006 1:40 pm 
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What engine are they for? What do you plan to use them on?

It depends on the rocker stud to valve tip center line diminsion to start with but there are some other things to consider on this also. Push rod position and is there sufficent clearance , ie guide plate slot, along with gross valve lift. My Brodix heads crap out at .700 lift so this is something you will have to check on.

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 Post Posted: Fri Apr 21, 2006 1:46 pm 
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if they will work im going to put them on a 400 sbc and run it on sreet and strip


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 Post subject: Re: roller rockers
 Post Posted: Fri Apr 21, 2006 2:04 pm 
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Avery wrote:
can you by any chance run a 1.7 roller rocker on a small block chevy?the reason i ask is a buddy has a brand new set of crane full rollers never been out of the box he is going to give me..so i was wondering thanks


If they are for a BBC .. no

I dont know of any SBC STUD MOUNTED rockers w/ a 1.7 ratio, Ken, Rick or the others might.


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 Post Posted: Fri Apr 21, 2006 2:07 pm 
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thats just i dont know what they are for i know they have 7/16 stud holes is all i know thanks


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 Post Posted: Fri Apr 21, 2006 3:25 pm 
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ive always wondered guys, what exactly does the 1.5, 1.6 and 1.7 ratios mean

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 Post Posted: Fri Apr 21, 2006 4:38 pm 
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Crane makes a 1.7 stud mount for a sbc and so dose scorpion. I have a new set of scorpions and i have a set of 1.7 on a 2bbl engine.

When you run the 1.7 you will have to modified the guide plate and head. The slot in the guide and head are not deep enought for how far the push rod end is moved on the rocker towards the stud.

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Last edited by Mike Rogers on Fri Apr 21, 2006 4:50 pm, edited 1 time in total.

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 Post Posted: Fri Apr 21, 2006 4:46 pm 
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The rocker Ratio is the 1.5, 1.6, 1.7 it is the cam lift multiplied by those numbers...a 360 cam lift is a .540 lift of the valve..use a 1.6 and get .576
and with a 1.7....612 lift.
Now these are the numbers the cam Manufactures use so when you see them in the Jegs book or where ever most are using a 1.5 Rocker arm.
Hope this helps. \:D/

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 Post Posted: Fri Apr 21, 2006 5:05 pm 
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ok what is the difference between bbc and sbc rockers?you would think 1.7 bbc or sbc would be the same


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 Post Posted: Fri Apr 21, 2006 5:19 pm 
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It is the fulcrum length from the stud to the valve. If you wanted to put BBC on a sbc you would have to relocate the stud just like Jenkins and Smokey did back in the 70,s

As you put longer valves in a head the intersecting lines from the stud to the valve get closer.Crower makes a rocker that they move the stud hole back on the rocker.

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 Post Posted: Fri Apr 21, 2006 5:21 pm 
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Mike Rogers wrote:
Crane makes a 1.7 stud mount for a sbc and so dose scorpion. I have a new set of scorpions and i have a set of 1.7 on a 2bbl engine.

When you run the 1.7 you will have to modified the guide plate and head. The slot in the guide and head are not deep enought for how far the push rod end is moved on the rocker towards the stud.



hey guys....Mike has your answer right here...do not use BBC 1.7 rockers...those have totally different alignment issues....and the 1.7 for SBC you will have to do alot more head work.....so my advise would be to you....don't buy used rocker arms, lifters, or cams....just too many things can go wrong and then you have to pay for that stuff again...I'm not suggesting that you always buy that stuff new, but less problems in the long run...than used stuff.... :-k :-k

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 Post Posted: Fri Apr 21, 2006 5:27 pm 
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ill find out if they are for sbc are bbc..if they arent for a sbc ill have a brand new set of crane roller rockers for sale


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 Post subject:
 Post Posted: Fri Apr 21, 2006 5:38 pm 
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SBC crane part number 1.7 11751-16
BBC crane part number 1.7 13750-16

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Last edited by Mike Rogers on Fri Apr 21, 2006 8:32 pm, edited 1 time in total.

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 Post Posted: Fri Apr 21, 2006 5:42 pm 
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ok thanks


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 Post Posted: Fri Apr 21, 2006 6:55 pm 
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Mike Rogers wrote:
Crane makes a 1.7 stud mount for a sbc and so dose scorpion.


Mike thanks for correcting me on that and providing the information !


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