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post #1 of (permalink) Old 02-06-2001, 10:26 PM
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Rocker Arms

I need to replace my stock rocker arms, and i was thinking about doing roller rockers. I was wondering what the advantages would be by using the stock 1.6 ratio rockers, or cobra 1.7s my engine is an 89 351 with mild mods (K&N, headers, flowmaster exhaust) i ve read that the 1.7s will give the same effects as a longer duration cam, and that decent increases in power can be had. What do you guys think?
thanks,
Bry




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post #2 of (permalink) Old 02-06-2001, 11:16 PM
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Re: Rocker Arms

the bigger rocker arm would yield more lift, without effecting the duration of the cam. thus, it would provide more power, without effecting the power band so without losing your low end power, u can see power gains across the board. the roller rockers in themselves should be good for a couple horses, and a smoother idling/reving engine.

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tree = bad
post #3 of (permalink) Old 02-07-2001, 02:10 AM
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Re: Rocker Arms

Don't forget. If you change out the rockers, lifters and cam to an oversized ratio, than you have to change the pistons so that they have clearence. Just an fyi [img]/wwwthreads_images/icons/wink.gif[/img]
-mike

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post #4 of (permalink) Old 02-07-2001, 05:34 PM
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Re: Rocker Arms

I used the 1:6 crane roller rocks in my 90/302. I did the math and it came out to approx running a compu cam. I stayed with the stock cam, and did not have any problems with piston contact.
http://fordmuscle.com/archives/1999/10/ptov/index.shtml has some great info on checking for valve piston clearance.

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