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Old September 23rd, 2013, 09:37 AM   #1
swampjeep
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Default proform roller rockers?

I have a new to me K5 blazer with a supposed rebuilt 350 in it.

first trip to the dunes this past weekend, pushrod broke through a rocker arm

I'mm thinking who knows how old or worn the rest of the rockers are so might be a good idea to just buy a set and upgrade to rollers.

any one know how there are?
http://www.jegs.com/i/Proform/778/66927C/10002/-1

this is just a basic 350, suppose to be rebuild as stock, bored .030" over, with slightly bigger then stock cam, stock TBI system. With valve cover off, it looks like the heads are pretty clean, so it' is possible.
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Old September 23rd, 2013, 10:22 AM   #2
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Those would be better than factory. Not great, but better. If it has a bigger cam in it and not much else done to it I wouldn't get the 1.6 arms. Stick with 1.5. Stock valve springs, larger cam and increase rocker ratio could cause some valve float at lower rpms than with factory ratio.
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Old September 23rd, 2013, 11:17 AM   #3
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just better then factory is good enough for me, problem on the 1.5 vs 1.6 is I have no ides the cam size, I was told "it's stock or just slightly bigger"

maybe I should just stay with 1.5's then,
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Old September 23rd, 2013, 11:43 AM   #4
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I would just stay with the factory ratio. Factory valve sprigs don't like having to move a lot. The cam if its just a little bigger will be good enough. Plus if you don't know about the cam the lift might be too big for the 1.6. Factory sbc springs are only good for about .550 lift. More than that and they might bottom out. So mild cam plus increased ratio might blow out your lifters, bend a pushrod, mess up the valves, or break another rocker. 1.5 roller tip rockers and your golden. I would pull out the pushrods and make sure they are all straight too.
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Old September 23rd, 2013, 11:50 AM   #5
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thanks
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Old September 23rd, 2013, 08:11 PM   #6
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I don't like anything from proform.....junk
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Old September 23rd, 2013, 08:16 PM   #7
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The ones he posted were just roller tips. So the stamped construction would clear factory covers.
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Old September 23rd, 2013, 08:20 PM   #8
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Quote:
Originally Posted by koochman450r View Post
The ones he posted were just roller tips. So the stamped construction would clear factory covers.
I should have clicked the link I guess

I fixed my post, thanks
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Old October 3rd, 2013, 08:05 AM   #9
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I have the proform rockers on the 355 in my camaro. 25k miles on it and haven't had any issues. 6500 rpm rev limit and no failures. mine are full aluminum roller rockers 1.6 ratio.
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Old October 3rd, 2013, 10:39 AM   #10
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How'd this go, I saw you guys working on the rockers last weekend :)
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