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291 heads with 547 lift cam. do I need guideplates |
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Halfbreed
AMC Apprentice Joined: May/18/2012 Location: Caro, michigan Status: Offline Points: 51 |
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Posted: Mar/30/2015 at 10:24am |
Putting together a 360 with a lunati cam with 547 lift. Using 291 heads. Machine shop says I will need guideplates. says he will have to ream out the guides for the pushrods for clearance because of the lift of the cam. Also wondering where to get a set of adjustable rocker studs? Should I go with a larger stud 7/16 vs std 3/8. Going with roller tip rockers 1.6 ratio. Any help would be appreciated. Thanks
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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There is not enough clearance to allow slop in the push rod wiggle, unless you are using narrow push rods or have modified the slots to be round on the heads, you will need guides. I don't think 7/16 studs fit... All ,mine are 3/8.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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All the threaded holes for screw in studs are 7/16 14.
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Keith Coggins 67Rogue X code
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Halfbreed
AMC Apprentice Joined: May/18/2012 Location: Caro, michigan Status: Offline Points: 51 |
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Thanks for the fast response. Bulltear has a set of guideplates I think will work. Where can I find some adjustable rocker studs? Thanks
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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Check with Bulltear .
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Keith Coggins 67Rogue X code
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tsanchez
AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4302 |
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I ran a .660 lift cam with stock slots in head, no guides. Not needed for that lift, and also I would use 3/8 studs to allow more clearance for the slot in rocker, assuming you are using slotted rockers with roller tip not full roller rockers
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401jim
Supporter of TheAMCForum Joined: Jan/07/2012 Location: Brunswick,Ohio Status: Offline Points: 793 |
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I'm with tsanchez. I was running 291 heads and had a cam with 595 / 608 and used no guide plates. I recommend using roller rockers and 7/16 screw in studs. The 7/16 studs will keep the rocker where it belongs and will be a lot stronger.
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Yup, 30 years ago in a 70' 390 no guide plates...
My heads were 3/8 screw in studs. |
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Gremlin Dreams
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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After seeing you and others with 3/8 studs... What's up with mine being 7/16? I thought my heads were bone stock.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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Provided the original pushrod guide slots in the 291C heads aren't worn irregular you don't need guide plates. The mounting holes for rocker studs are 7/16, but the rocker mounting end of the studs are originally 3/8". Unless you intend to run over 500# valve springs I would simply get a set of studs for 3/8 rockers and corresponding roller rockers. Those parts can be obtained from Summit or Jegs. SKeown
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