Roller rockers
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Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
Roller rockers
Happy New Year guys!
So I was doing a little day dreaming web surfing as always and I saw these on Summit Racing website.
https://www.summitracing.com/parts/scc-scp1059
Thoughts? They're for pedestal mount head so to mount them would you just do like the stock rockers torque to spec. Also they're 1.7 vs 1.6
So I was doing a little day dreaming web surfing as always and I saw these on Summit Racing website.
https://www.summitracing.com/parts/scc-scp1059
Thoughts? They're for pedestal mount head so to mount them would you just do like the stock rockers torque to spec. Also they're 1.7 vs 1.6
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
I looked into those for my build, but since at that point, I already had a pretty big performance cam, I didn't want to increase the lift even more.
Stock lift is 0.398" (with 1.6 rockers) so going to 1.72 would increase that to 0.428". I already had 0.504" and 1.72 would have increased it to 0.542"
My only issue with them would be the pedestal mount. Pedestal mount rockers are great for a stock engine, since everything is already cut and measured, but if you did some head work, the geometry won't line up anymore and you'll have to use shims (which seems like a pain) to get it set just right.
Otherwise, they seem like they'd be a really nice upgrade for a stock engine, especially since the Chevy rocker arm upgrade can only be done on non-pedestal mount heads.
Stock lift is 0.398" (with 1.6 rockers) so going to 1.72 would increase that to 0.428". I already had 0.504" and 1.72 would have increased it to 0.542"
My only issue with them would be the pedestal mount. Pedestal mount rockers are great for a stock engine, since everything is already cut and measured, but if you did some head work, the geometry won't line up anymore and you'll have to use shims (which seems like a pain) to get it set just right.
Otherwise, they seem like they'd be a really nice upgrade for a stock engine, especially since the Chevy rocker arm upgrade can only be done on non-pedestal mount heads.
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
I looked into those for my build, but since at that point, I already had a pretty big performance cam, I didn't want to increase the lift even more.
Stock lift is 0.398" (with 1.6 rockers) so going to 1.72 would increase that to 0.428". I already had 0.504" and 1.72 would have increased it to 0.542"
My only issue with them would be the pedestal mount. Pedestal mount rockers are great for a stock engine, since everything is already cut and measured, but if you did some head work, the geometry won't line up anymore and you'll have to use shims (which seems like a pain) to get it set just right.
Otherwise, they seem like they'd be a really nice upgrade for a stock engine, especially since the Chevy rocker arm upgrade can only be done on non-pedestal mount heads.
Stock lift is 0.398" (with 1.6 rockers) so going to 1.72 would increase that to 0.428". I already had 0.504" and 1.72 would have increased it to 0.542"
My only issue with them would be the pedestal mount. Pedestal mount rockers are great for a stock engine, since everything is already cut and measured, but if you did some head work, the geometry won't line up anymore and you'll have to use shims (which seems like a pain) to get it set just right.
Otherwise, they seem like they'd be a really nice upgrade for a stock engine, especially since the Chevy rocker arm upgrade can only be done on non-pedestal mount heads.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Do you have pedestal rockers on your head? Or are they studs?
If you're using studs, I don't think those would work anyway.
Otherwise, for about $50 more, I went with Harland Sharps on mine and really like them.
If you're using studs, I don't think those would work anyway.
Otherwise, for about $50 more, I went with Harland Sharps on mine and really like them.
Thread Starter
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Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
Yes, I have pedestal mount rockers. I'm super tempted it's bad. Haha!
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Just a quick thought. If you're using performance springs, or something similar, they have a spring pressure for when they're completely closed and completely open (with the lift of your cam taken into account). As well as a coil bind (which is the furthest they can open before they are 100% compacted). This is something a head rebuilder would have measured all out (if you had someone do all that work for you).
If you increase the lift, you increase your spring pressure, which puts more pressure on your cam lobes and components. If your spring pressure goes over what the cam is rated for, you could wipe a cam lobe. All of these pressures were taken into account when I was researching springs to go with my high lift cam. (Another reason why I didn't want to go from 1.6 to 1.7 with rockers).
You might totally be in a safe range to do that, but it's something to check first.
If you increase the lift, you increase your spring pressure, which puts more pressure on your cam lobes and components. If your spring pressure goes over what the cam is rated for, you could wipe a cam lobe. All of these pressures were taken into account when I was researching springs to go with my high lift cam. (Another reason why I didn't want to go from 1.6 to 1.7 with rockers).
You might totally be in a safe range to do that, but it's something to check first.
Thread Starter
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Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
Oh man. Thanks for mentioning that I honestly didn't think of that I'm gonna have to have a talk with my machinist. It's was five or more years ago that I did the rebuild I dont remember I just remember giving him the cam card and the springs and kit that came with the cam.
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Lead Driver
Joined: Mar 2008
Posts: 7,177
Likes: 377
From: Near Los Angeles
Using the bbc higher ratio rocker moves the p.rod closer to the rocker pivot point, closer to the valve. With your type of head you'll need guide plates, but you can convert to the stud mount type rockers easily. Then you can pick up a set of bbc used rr's for about $100.
I found this a while back: A pedestal mount 300 head can use stud mount rockers if you use a pushrod guidplate conversion kit. I have intsalled it on my 90 cyl head and it all works just fine. Crane part number 36655-16 will give you 3/8 studs and guideplate for 5/16 pushrods. If you go this route hardened pushrods are not required becuse the kit has nylon inserts in the guidplates. I had to mix a couple of kits on mine cause I needed 7/16 studs for BBC rockers I already had. It is best for long life of the nylon inserts if you polish the pushrods to make sure there are no burrs on them. This is easy to do in a drill.
This conversion kit will also make your valvetrain adjustable. Btw, they do make the bbc rockers in 1.6 too.
I found this a while back: A pedestal mount 300 head can use stud mount rockers if you use a pushrod guidplate conversion kit. I have intsalled it on my 90 cyl head and it all works just fine. Crane part number 36655-16 will give you 3/8 studs and guideplate for 5/16 pushrods. If you go this route hardened pushrods are not required becuse the kit has nylon inserts in the guidplates. I had to mix a couple of kits on mine cause I needed 7/16 studs for BBC rockers I already had. It is best for long life of the nylon inserts if you polish the pushrods to make sure there are no burrs on them. This is easy to do in a drill.
This conversion kit will also make your valvetrain adjustable. Btw, they do make the bbc rockers in 1.6 too.
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