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291c Heads |
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69 ambassador 390
Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Why are you pulling the engine just to change heads?
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Steve Brown
Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special |
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GREM
AMC Apprentice Joined: Feb/12/2011 Location: Colorado Status: Offline Points: 46 |
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Sold the old car as a roller & using the drivetrain in another one
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GREM
AMC Apprentice Joined: Feb/12/2011 Location: Colorado Status: Offline Points: 46 |
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I picked up the heads last Tuesday. After an email to the webmaster I was rewarded very quickly with picture posting privileges so here goes... This is what they look like ready for some AMC paint. My machinist replaced the valve springs with new ones to match the cam in addition to the stainless steel valves, hardened seats, new seals, & new keepers...the price for a glob of clay is sounding pretty good right now; so thanks to all of you... I'll be checking clearances long before turning the ignition key for the first time! |
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GREM
AMC Apprentice Joined: Feb/12/2011 Location: Colorado Status: Offline Points: 46 |
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Managed to get a couple coats of paint on one of the heads tonight. Hopefully can finish the other one soon.. Edited by GREM - Apr/27/2011 at 10:41pm |
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GREM
AMC Apprentice Joined: Feb/12/2011 Location: Colorado Status: Offline Points: 46 |
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Finished painting the other head a few days ago. My choice of headers is Hedman and a friend informed me that the header flanges will need to be ground a bit to clear the short head bolts. The cost for having the headers "Jet Hot" ceramic coated inside & out isn't cheap; so a mockup of some sort makes sense before sending them out for coating. The donor engine block won't be available for a while, so I called a neighbor last night & asked him if he'd like to come over for some "bench racing" . We first bolted up the heads to my workbench so the overhang allowed the short ARP bolts with chamfered washers to rest in position. The flanges wouldn't line up to the header bolt holes properly so we took them out & mocked up a few washers & a nut for measurement Here's a pic of how much needs to be ground using the mocked up washers & the nut. Hopefully by the end of the weekend I'll have some more pics with the ARP bolts in place & the headers mocked up in place... |
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Traveller
AMC Addicted Joined: Feb/26/2011 Location: Idaho Status: Offline Points: 1011 |
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Just don't get them coated until after initial break-in is done or use a different set for break-in. The typical 20-30 minutes of break-in running will cook the coating. All the header manufacturers as well as the coating shops will void the warranty on the coating if the headers are used at break-in. Just an FYI. Looking good on the heads!
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GREM
AMC Apprentice Joined: Feb/12/2011 Location: Colorado Status: Offline Points: 46 |
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That's why I ordered my headers thru Jet Hot. Lifetime guarantee no questions asked as long as I own the car. A bit more expensive but well worth it because they'll stand behind initial break in. Jet Hot...800-432-3379. Talk to Dan. I got the flanges ground down to fit the ARP bolts mocked up. It's tight but better than it was... We've strayed a bit from my original post so I'd like to revisit with a direct question about which adjustable rocker studs should I use with the Scorpion roller rockers & do I need to use guides? It's my understanding that the longer small block Ford are the one's? I know they are the 3/8" studs but I'm not sure about the length needed. Thanks... |
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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You only need pushrod guideplates on the wider and more oval shaped pushrod holes from the later heads unless there is excess wear on your exisiting heads guideholes which is extremely and not even remotely evident in your head pictures. I just use SBC studs that are the stock 7/16ths in the head and 3/8ths on the shaft. Your setup has nothing dramatic on it other than the Scorpians so even stock replacement studs SBC studs should do the trick. Only caution is that I am not familiar with how tall the body of Scorpian rollers are so you want want to try one before you put all of them in. The SBC studs fit under stock valve covers which is why I like them.
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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Traveller
AMC Addicted Joined: Feb/26/2011 Location: Idaho Status: Offline Points: 1011 |
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I've installed Scorpion rollers and they look virtually identical to the small Ford versions. We just happened to be building a 306 at the same time I was putting together a 401 and had two sets of rockers to compare. The're awfully close if not the same.
If you stick to stock pushrod diameter then your heads should guide your pushrods.
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jeremy0711
AMC Addicted Joined: Dec/12/2008 Location: Southern IN Status: Offline Points: 1547 |
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I have ford motorsports 1.6 small block adj. rockers on my 401 with ARP chevy studs with 8.1 length Mallory hardened pushrods on 993 heads with stock valve covers. I also checked the pushrod length to make sure the rockers are centered on the valve tops which you should too as you have spent as much as I have on stock heads so you don't want to cause any excessive guide wear. It seems there were several lengths on the studs that you should be concerned with. Am I wrong here guys. Don't remember and I only had to buy one set so not enough repetition to make the stupid smarter.
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