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Old 10-03-2005, 10:27 AM
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sbc 406 / 7102

400 block with interal bal crank, With the extra cu-in I was thinking it may be helpful to use 1.7 rockers to help breathe easy.
Why is this a good or bad idea? I don't see many high ratio rockers on sbc, why is it?
(My 215 dartII heads will take to .62 lift.)

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Old 10-03-2005, 10:54 AM
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We use 1.7 rockers quite a bit, especially on restricted race motors. We feel Crower makes the nicest for this application.

You don't want to break in a camshaft though with these. We have a dyno set of 1.3's from Crower we use.
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Old 10-03-2005, 11:03 AM
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Crower Severe Duty Sportsmans are good for the money. Don't use the regular sportsmans though, they are nothing more than what summit sells for cheap.
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Old 10-03-2005, 05:19 PM
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Quote:
Originally Posted by Rick WI
We use 1.7 rockers quite a bit, especially on restricted race motors. We feel Crower makes the nicest for this application.

You don't want to break in a camshaft though with these. We have a dyno set of 1.3's from Crower we use.
Are 7/16" studs necessary?

I have ARP 3/8" studs with stud girdles. Will they hold up to 1.7 rockers? My cam only has .488" lift.
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Old 10-03-2005, 05:35 PM
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Unless Crower has added them and not updated the online catalog, you do have to use 7/16" studs. For the Stainless steel rockers anyway, I didn't check for aluminum. 1.65 ratios rockers are listed for use with 3/8" studs though.

Larry
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Old 10-03-2005, 05:58 PM
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That is correct, we use the stainless steel Enduro rocker which needs the 7/16 stud.
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Old 10-04-2005, 09:28 PM
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Quote:
Originally Posted by Rick WI
That is correct, we use the stainless steel Enduro rocker which needs the 7/16 stud.
I have seen some rockers that are made for 3/8" studs that have the 1.7 ratio. Do you think the 3/8" studs will hold up to the 1.7 ratio? I have some pretty heavy springs too.
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Old 10-05-2005, 05:38 AM
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If in doubt I would just run a stud girdle, they are available now for around $100 and less-check out ebay. Make sure your pushrod slots/holes in the heads have enough clearance for the 1.7's or you may need to open them up some.
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Old 10-05-2005, 08:53 AM
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77, I don't know. A stud girdle may be a wise option though. With your situation though, new rockers, stud girdle, you may be better off regrinding your existing cam for the additional lift. That is a pretty straight forward process and would be cheaper. Although a bit more work.
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Old 10-05-2005, 05:05 PM
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Quote:
Originally Posted by Rick WI
77, I don't know. A stud girdle may be a wise option though. With your situation though, new rockers, stud girdle, you may be better off regrinding your existing cam for the additional lift. That is a pretty straight forward process and would be cheaper. Although a bit more work.
I am running a 3/8" stud girdle already. That is why I am hesitant on buying 7/16" studs. I don't want to have to buy another stud girdle too.

I have the old Sportsman II heads. They have tons of room at the pushrod slot.

With my compression the duration of my cam is perfect. That combined with the lobe sep. I would just like to have a little more lift to take advantage of the heavier valvesprings that I have.
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Old 10-05-2005, 05:22 PM
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I think the best advise I could give is to talk with Crower. The other option is to talk with Scorpion. They might be able to work something out for you a they have done a few oddball things for us in the past. Scorpion is an OK rocker, not as nice (or expensive either) as Crower.

Scorpion will even do odd ball things like stamp 1.5 on 1.7 or 1.8 ratio rockers, if you catch my drift.
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Old 10-05-2005, 05:44 PM
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Quote:
Originally Posted by Rick WI
I think the best advise I could give is to talk with Crower. The other option is to talk with Scorpion. They might be able to work something out for you a they have done a few oddball things for us in the past. Scorpion is an OK rocker, not as nice (or expensive either) as Crower.

Scorpion will even do odd ball things like stamp 1.5 on 1.7 or 1.8 ratio rockers, if you catch my drift.
Do the Scorpion 1.7s and the 1.8s usually cost more or are you talking about trying to play it stock in appearance?I was looking at some 1.7s being sold on Ebay for pretty cheap. I am a little unsure of their quality. I am running 1.6 Erson rockers right now.

I wish I could get those Miller Mid Lift rockers in a 1.7. Have you seen those?
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