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291c Heads |
Post Reply | Page <1 34567 9> |
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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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They are the same. Only the exhaust gaskets are different.
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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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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10343 |
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I was throwing together a motor from parts I had trying to make a AMC event, 2 weeks and no money, and the gaskets that came off where mangled so could not use them. I did want to check valve/piston as I did not want to take the word of a Summit tech it would fit and find out he was wrong! Because I did not add to the push rod with the headgasket on I must have more room between valve & piston
Dave ----
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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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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69 ambassador 390
Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539 |
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Oh! Man. I forgot to tell him to remove the clay before he bolts the head back on.
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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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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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Don't worry, that chit will bun out of there eventually. No problem!
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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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But what if it turns to ceramic and glazes the cylinders?
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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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All in good fun...The step up dowels from Keith Coggins arrived yesterday & look to be very nice. Tapered & everything. So if I'm reading this right there should be no problem using my 1968 390 AMX square port head gaskets with the 7/16" bolts providing I don't put the step up dowels in first? |
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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If you're old gaskets are aftermarket the dowel pin holes should have 4 little tabs in them. If you push the gaskets down on the larger dowel they'll bend out of the way.
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Keith Coggins 67Rogue X code
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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no such thing as early and later 390 head gaskets. One size fits all unless you go custom to be exactly equal to your bore.
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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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GREM
AMC Apprentice Joined: Feb/12/2011 Location: Colorado Status: Offline Points: 46 |
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I stopped into the machine shop on Fri to see how things were progressing. Even tho the consensus is the stock seats would work fine I decided to go ahead & spend the extra money on hardened seats & SS valves. I don't have much confidence in the quality of fuel getting any better. The machinist ensured me that the new valves are identical in length to the one's in the square port heads so I won't be doing the clay test (great info tho!). He is installing the shallow seats. I've heard that because of the shift in some of the castings from the factory the deeper seats in the forward cylinder may have an issue. The valves were on backorder, but arrived on Wed so the heads should be done the end of next week. The roller rockers & adjustable studs, & gaskets have arrived.
The motor should be out of the car in about two or three weeks & on an engine stand for a few more; so I'll have the option of doing the mockup on the heads & the pushrod measurement out of the car. I have the 7/16" ARP head bolts as well... So if I'm reading this right I can remove the old heads & use the existing head gaskets (squished) for mockup. Before placing new heads on block I'll replace one of the valve springs with a weaker one (I don't have one yet but I'm working on it). Super glue a spare lifter so it won't compress. Bolt on new heads using the 70+ torque specs and adjust the roller rockers so they are centered. Now for the questions... - I'm assuming at this point the backlash on the adjustable pushrod should be 0? - Once one valve is done is it safe to order all the pushrods this length or do I need to go thru this whole procedure for each valve?
Thanks once again |
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