Roller rockers, 1.7
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Lead Driver
Joined: Mar 2008
Posts: 7,182
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From: Near Los Angeles
Roller rockers, 1.7
I have finally surrendered to the necessity of getting roller rockers. Yep, I'm going to use the chevy 250 rollers, if I can find a good reasonable pair on ebay.
It's just a shame they don't make glass top v. covers so I could show them off. lol.
I'm sure it will enable me to run a 10 second 1/4 mile. At least.
It's just a shame they don't make glass top v. covers so I could show them off. lol.
I'm sure it will enable me to run a 10 second 1/4 mile. At least.
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
I have found that I can go two routes for relatively little money: Either I can retain my 3/8" studs and simply bolt in a set of chevy 250 oe 1.73 rockers for about $50, or replace the studs with 7/16" for $35, and buy a set of bbc rollers on ebay for about $125.
I would like to hear some opinions regarding this switch. I have spoken to several owners who have done it with great success.
I would like to hear some opinions regarding this switch. I have spoken to several owners who have done it with great success.
Elder User
Joined: Nov 2004
Posts: 666
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If you are talking about the stock press-in rocker studs, I would definitely switch to screw-in studs. With stock springs and stock cam, the press-in studs have been known to pull out from time to time. The increased stress from the 1.73 rockers will make it more likely that you might pull one.
As for the studs, you can tap the head for 7/16" threads and get studs that are 7/16" on the bottom and either 3/8" or 7/16" on the top. You are not stuck with having to use 7/16" rockers if you go to screw-in studs.
As for the studs, you can tap the head for 7/16" threads and get studs that are 7/16" on the bottom and either 3/8" or 7/16" on the top. You are not stuck with having to use 7/16" rockers if you go to screw-in studs.
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Lead Driver
Joined: Mar 2008
Posts: 7,182
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From: Near Los Angeles
Does anyone know anything about the Summit brand roller rockers? I'm curious, but would rather spend more than buy poor quality.
SUM-G6930B $220.00
They also sell a set of Comp Cams 1.7 7/16" stud bbc roller tip rockers for $120. I'm guessing but assume these would need larger diameter p. rods.
SUM-G6930B $220.00
They also sell a set of Comp Cams 1.7 7/16" stud bbc roller tip rockers for $120. I'm guessing but assume these would need larger diameter p. rods.
Postmaster
Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
Try over at FSP. Some one or more over there probably have rollers installed and can tell you.
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Elder User
Joined: Nov 2004
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If your head originally had adjustable rocker arms, then the holes where the pushrods come through the head will be slots. If you look closely at the holes, you will see that they have flat sides. This sets the position of the pushrod. If you are going to use the same (stock) pushrod diameter, then you may be able to run without guide plates. You have to check to make sure the slot is long enough for the 1.7 rockers - the pushrod will be moved closer to the pivot on the 1.7 rockers, so make sure the pushrod does not hit the end of the slot. If the pushrod hits, you will need to either lengthen the slots or drill them out larger and run guide plates.
If you are going to use larger diameter pushrods, you will need to open up the holes where the pushrod come through the head. Most people just drill them out and use guide plates.
If you head had non-adjustable rocker arms, the holes will be large round holes. You will need guide plates when you switch to roller rockers.
Hope this helps.
If you are going to use larger diameter pushrods, you will need to open up the holes where the pushrod come through the head. Most people just drill them out and use guide plates.
If you head had non-adjustable rocker arms, the holes will be large round holes. You will need guide plates when you switch to roller rockers.
Hope this helps.
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If you are talking about the stock press-in rocker studs, I would definitely switch to screw-in studs. With stock springs and stock cam, the press-in studs have been known to pull out from time to time. The increased stress from the 1.73 rockers will make it more likely that you might pull one.
As for the studs, you can tap the head for 7/16" threads and get studs that are 7/16" on the bottom and either 3/8" or 7/16" on the top. You are not stuck with having to use 7/16" rockers if you go to screw-in studs.
As for the studs, you can tap the head for 7/16" threads and get studs that are 7/16" on the bottom and either 3/8" or 7/16" on the top. You are not stuck with having to use 7/16" rockers if you go to screw-in studs.
Elder User
Joined: Nov 2004
Posts: 666
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Yes, those failures can be painful. If you are lucky, the stud just pulls out part way and the truck runs like crap. If you are unlucky, it pulls all the way out and your cooling system empties itself into your crackcase. The holes are drilled through into the water jacket. So if you make the change to screw-in studs, you should put some sealer on the threads to prevent cooling system leaks.
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
Luckily when I had the large valves put in the shop installed new screw in studs. If I go with the rollers, I'll most like use the bbc rockers, and that means swapping out the studs for ones with the 3/8's bottom, and 7/16's tops.
With the 1.7 ratio, I'm wondering how it will affect my mpg. Also, I can't help but wonder about the "15--40 hp gain" some manufactures advertise. I could maybe see 3--5 hp gain.
With the 1.7 ratio, I'm wondering how it will affect my mpg. Also, I can't help but wonder about the "15--40 hp gain" some manufactures advertise. I could maybe see 3--5 hp gain.
Senior User
Joined: Jan 2009
Posts: 243
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From: Port Orchard, WA
Does anyone know anything about the Summit brand roller rockers? I'm curious, but would rather spend more than buy poor quality.
SUM-G6930B $220.00
They also sell a set of Comp Cams 1.7 7/16" stud bbc roller tip rockers for $120. I'm guessing but assume these would need larger diameter p. rods.
SUM-G6930B $220.00
They also sell a set of Comp Cams 1.7 7/16" stud bbc roller tip rockers for $120. I'm guessing but assume these would need larger diameter p. rods.
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