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Cometic MLS head gaskets |
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DragRacingSpirit
AMC Addicted Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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The best head gasket I have used for my application, though I don't have at much compression as your engine is the ROL HG31190HT if you can still find a set. But like I said i dont have 15.1 compression, only 13.5:1. To get the ROL HT gaskets to hold at this compresion level all I had to do is install the extra head bolts on my SR heads, drill the block and used a gasket punch on the ROL head gaskets to match the extra holes. Never had a problem in years running this combination of iron block and SR heads. |
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1006 |
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Well, I dusted off this project to get it back together. I re-examined all the components and found the issue, the coolant port on the lower front corner of the number 3 cylinder is cast too large compromising the gasket. I can’t believe I didn’t see it before, but it is very clear at this point. I’m told to match a set of felpro gaskets up and see if they will seal. If that’s a no go I will need to tig it up and resurface the head. Has anyone encountered this with the Indy SRs before? Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2427 |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1006 |
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Haha, how did I miss that in my very own thread!
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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POS #1
AMC Nut Joined: Jan/28/2014 Location: Ohio Status: Offline Points: 498 |
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when i 1st got my SR's.. i also had head gasket issues... in my case, turned out it took. .015 to get my heads Flat, and that was the issue i had personally.
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1006 |
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Well, disappointment strikes again. I guess the extra head bolts are mandatory. The engine builder I used has remained adamant that I don’t need them but that seems to be BS. What is the best way to approach this? I assume I just have the machine shop drill 3/8” holes where INDY has them? My local machine shop has done this to a few amc engines but typically with steel heads and one with HLR heads. Can I do this with quality results in the car? Any advice is appreciated. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2427 |
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Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1006 |
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So that’s a no? Haha, I honestly can say at this point I don’t care. If the motor blows up I’d probably be relieved, I could either start over on a new engine or sell the car as a roller. This thing has been a disappointment from day one, for someone with time this it’s probably not much of an issue, but I just don’t have it. I spent a lot money and put my faith in the notion that someone who has a great deal of experience was going to do what needed to be done. I didn’t cheap out, I actually brought up adding the additional bolts and was assured that with studs and modern MLS gaskets everything would be happy. If the motor comes out I’d probably like to send it to someone competent to fix it. For something this seemingly basic to this type of build to be overlooked is odd and has me questioning everything. I find it hard to believe this wasn’t an issue on the dyno, Im willing to give people the benefit of the doubt, but this combined with a handful of other things has made it obvious this is a lack knowledge or an intent to deceive. Thanks for all the advise, I appreciate it. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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I'd say yes, but takes extra care and time. If you're not confident in doing it, pull the engine and send to the machine shop.
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i6cj7
AMC Apprentice Joined: Feb/20/2018 Location: virginia Status: Offline Points: 136 |
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What's it cost for a machine shop to do the extra bolt holes in an aluminum head and block?
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