Roller Rockers...
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Cross-Country
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Roller Rockers...
Ok, I'm in kinda a pickle here.I have a 400 and a set of redonde heads. They are completely rebiult, and have been planed about 0.020. Well, we bolted them on and when I tighten down the rocker arms, the valves all open. It appars that whatever they took off the bottom of the head, they didn't take off the tops of the valves, which allows the valves to open about 0.020-0.030.
Now, I saw a post somewhere about some roller rockers that didn't require any machining to the head. I have the engine in the truck, and everything put together, so I don't want to pull it apart.
Is there anything else I need???
Thanks
Riley
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Cross-Country
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Roller Rockers...
I found some roller rockers from ford motorsports. They are bolt on, and don't require any machining. Does anyone know of any cheaper ones. They are at
http://www.racesearch.com/CGI/racesearch_ec.cgi?race_product_id=377943;descripti on_id=1637
It doesn't say that they are adjustable, I'm assuming they are??? They seem a little expensive at $253.
Will I need taller valve covers as well???
Thanks
Riley
http://www.racesearch.com/CGI/racesearch_ec.cgi?race_product_id=377943;descripti on_id=1637
It doesn't say that they are adjustable, I'm assuming they are??? They seem a little expensive at $253.
Will I need taller valve covers as well???
Thanks
Riley
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From: (near) Denver USA
Roller Rockers...
[font size="1" color="#FF0000"]LAST EDITED ON 26-Jul-01 AT 11:04 AM (EST)[/font][p]skud (Riley),
If your valves stay open after machining the head, you really need shorter push rods.
The M-6564-C351 rockers are not adjustable, but I believe they can be shimmed under the trunion/fulcrum to compensate (some) for head shaving. Be careful you don't overdo it and lose lift. It's better to get the correct length push rods than to shim the fulcrum.
Your price is a good deal, as the retail is about $300.
FRPP claims they are a direct replacement part, but I suspect they may not fit under the stock valve cover. I know they will fit under the cast aluminum M-6582-A341 (black) or M-6582-A342 (polished) valve covers.
Good luck.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
If your valves stay open after machining the head, you really need shorter push rods.
The M-6564-C351 rockers are not adjustable, but I believe they can be shimmed under the trunion/fulcrum to compensate (some) for head shaving. Be careful you don't overdo it and lose lift. It's better to get the correct length push rods than to shim the fulcrum.
Your price is a good deal, as the retail is about $300.
FRPP claims they are a direct replacement part, but I suspect they may not fit under the stock valve cover. I know they will fit under the cast aluminum M-6582-A341 (black) or M-6582-A342 (polished) valve covers.
Good luck.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
Lead Driver
Joined: Nov 2000
Posts: 6,637
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From: Albuquerque
Roller Rockers...
[font size="1" color="#FF0000"]LAST EDITED ON 26-Jul-01 AT 11:07 AM (EST)[/font][p] Longer/shorter push rods used to be available from Ford. Also Crane cams makes the roller rockers. They also offer shims that go under the stock rockers that I used in the past. The shims would be the quick and easy way.
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
1977 Ford F-100
400m/c6/4:11/Gear Vender O.D.
Crane hydralic roller, forged, ported polished,Deamon,Edlebrock, yada, yada, yada
280,000 miles
Stock on the outside
modified/rebuilt everything
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From: PacNW
Roller Rockers...
Another alternative is getting a conversion kit from Crane which will allow you to install any adjustable rocker out there including the roller tips for about $80. It consists of 5/16-7/16" studs and guide plates with special inserts so you don't have to run hardened pushrods. It's very easy to install and doesn't require any machining.
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From: (near) Denver USA
Roller Rockers...
skud (Riley),
To determine either the rod length you need or the correct amount of shimming under the fulcrum, you need to measure the amount the valves are open when the rockers are installed. Just use a dial indicator in the top of the valve spring retainer to measure the valve opening.
Shimming the fulcrum is really no easier than changing out the push rod, since both require removing the rocker. However, if you get a shim kit with various sizes, you can do it all at once, rather than maybe waiting a few days for the correct length push rods to arrive (if they're not in stock locally).
I'd say as long as you don't need to shim more than 0.025" or so, you're not weakening the valve train significantly.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
To determine either the rod length you need or the correct amount of shimming under the fulcrum, you need to measure the amount the valves are open when the rockers are installed. Just use a dial indicator in the top of the valve spring retainer to measure the valve opening.
Shimming the fulcrum is really no easier than changing out the push rod, since both require removing the rocker. However, if you get a shim kit with various sizes, you can do it all at once, rather than maybe waiting a few days for the correct length push rods to arrive (if they're not in stock locally).
I'd say as long as you don't need to shim more than 0.025" or so, you're not weakening the valve train significantly.
BubbaF250
1980 F250 4x4 Custom, 351M/NP435/NP208/D44HD-TTB/D60-FF/3.55s 6750 GVW, Rust & White.
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Cross-Country
Joined: Aug 2000
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Roller Rockers...
Well, I placed an order through Summit for the shims. I'll let ya know how they work out. I pisses me off that it took two days to find the problem. Anyways, here is what i got so far.
400 (D7TE)
Regular "M" Heads 3-Angle valve job - Bronze guides
Comp Cams 270H cam 224 int/exh 110 Lobe Sep .519lift
Ohio Flat Tops
Comp Lifters and Springs
Weiand Stealth 8010 Intake
Hedman Hedders
Holly 600 Vacume w/electric Choke
C-6 w/shift kit
Clevite 77 Bearings all round
Milodon Head and Main Studs
ARP rod bolts
All this snugly in a 1977 F-150 XLT
It would run for a bit, then die, but when it did run boy was it LOUD!!! (Straight off the hedders)
Thanks
Skud
400 (D7TE)
Regular "M" Heads 3-Angle valve job - Bronze guides
Comp Cams 270H cam 224 int/exh 110 Lobe Sep .519lift
Ohio Flat Tops
Comp Lifters and Springs
Weiand Stealth 8010 Intake
Hedman Hedders
Holly 600 Vacume w/electric Choke
C-6 w/shift kit
Clevite 77 Bearings all round
Milodon Head and Main Studs
ARP rod bolts
All this snugly in a 1977 F-150 XLT
It would run for a bit, then die, but when it did run boy was it LOUD!!! (Straight off the hedders)
Thanks
Skud
