Big Block Chevy Roller Rockers

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F-250 Restorer
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Big Block Chevy Roller Rockers

Post #1 by F-250 Restorer » Sat Aug 12, 2017 3:46 pm

I am hoping this thread will be used for the benefit of others.

I am concerned with fitment and exact measurements with the 1.6 big block Chevy roller rockers. I would like to hear from someone knowledgeable, who has used, or is using, the bbc r.rockers, and who can explain the differences between this rocker and one manufactured for the 240/300 engine. For example, these bbc rockers: https://www.summitracing.com/parts/cca-1826-12

Is there an issue when using the bbc r.rocker? Or is everything kosher? Thank you for taking the time to explain.

pmuller9
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Re: Big Block Chevy Roller Rockers

Post #2 by pmuller9 » Sat Aug 12, 2017 4:04 pm

Those are exactly the roller rockers I use on my last 300 build.
No problems all. Here they are!

https://dl.dropboxusercontent.com/u/393 ... G_0135.JPG
https://dl.dropboxusercontent.com/u/393 ... G_0133.JPG

The last photo shows stock pushrods. The SBC valves used for this head are .100" longer that stock.
Longer Manton pushrods were needed to get the rocker roller working across the center of the valve stem.
Manton 4 series 5/16 x .118 Wall, 10.290" length.

old28racer
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Re: Big Block Chevy Roller Rockers

Post #3 by old28racer » Sat Aug 12, 2017 8:08 pm

What did the Manton push rods cost? How are they on turnaround?

pmuller9
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Re: Big Block Chevy Roller Rockers

Post #4 by pmuller9 » Sun Aug 13, 2017 8:03 pm

old28racer wrote:What did the Manton push rods cost? How are they on turnaround?

Depending on how busy they are they can complete an order in 1 to 2 days
Racer price is $16.38 each
Jobber price is $13.65 each

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THE FRENCHTOWN FLYER
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Re: Big Block Chevy Roller Rockers

Post #5 by THE FRENCHTOWN FLYER » Mon Aug 14, 2017 9:17 am

pmuller9 wrote:Manton 4 series 5/16 x .118 Wall, 10.290" length.

Wow, that makes the hole in the center .076 dia.
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pmuller9
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Re: Big Block Chevy Roller Rockers

Post #6 by pmuller9 » Thu Aug 17, 2017 7:29 pm

THE FRENCHTOWN FLYER wrote:
pmuller9 wrote:Manton 4 series 5/16 x .118 Wall, 10.290" length.

Wow, that makes the hole in the center .076 dia.


Consider that the hole in most aftermarket insert pushrod tips are around .065".

Stock pushrod tip holes are .095", Wall thickness .060"

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THE FRENCHTOWN FLYER
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Re: Big Block Chevy Roller Rockers

Post #7 by THE FRENCHTOWN FLYER » Thu Aug 17, 2017 9:59 pm

OK, just to be clear, I was not concerned that the hole is too small, which may imply that lubrication would be inadequate.
I make my own pushrods, using hardened tips available from various suppliers. The boss on the tips that get pressed into my 3/8" 4130 chrome moly blanks has a diameter of .300". Thus I end up with a 3/8" D pushrod that is light and strong in column bending. What struck me was that the 5/16 pushrods with a .076" D hole are roughly 81% heavier than the aforementioned 3/8" pushrods. I guess either option will work - I just try not to beat up my valve train too much by keeping things light - also using titanium valves / retainers, etc when max revs are a concern.
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pmuller9
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Re: Big Block Chevy Roller Rockers

Post #8 by pmuller9 » Thu Aug 17, 2017 10:11 pm

I wasn't sure, Thanks for clearing it up.
I agree that a 3/8" pushrod is a better choice.
I already had the 5/16 guide plate pairs welded together so I took the easy route.

Next time I will consider 3/8" pushrods.

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