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Rod Bushing service for 390...asap |
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Plan B
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Rockland Co NY Status: Offline Points: 285 |
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Posted: Feb/01/2013 at 8:25am |
Hi ,
I am in need of a shop that can bush my stock rods from my 68 390. Long of the short, without getting into a ton of detail here is that got my pistons and pins from Bulltear and my engine shop (in the rebuilding biz for over 60 years) is not happy with the pins sizing in the rod. He wants a pressed fit and the pins are able to be pushed out by hand. All my rods are in excellent shape and within factory spec coming from a 65k car that my mother drove as a daily driver. If I can't find a shop that can bush my rods I will need a pin that is 1.0001" as the pin we got from Bulltear is 1.000". Matt could not find anything on his end. My machine shop, Haledon Auto has done motors for everyone I know from my fathers generation in the hobby and has a stellar reputation. The owner told me that everyone he knows that was in the business that bushed rods is closed up. Help I am all ears. As always thanks in advance for any help you may have to offer. Shawn
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tsanchez
AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303 |
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Run them full float steel on steel, My engine went 25 yrs with no issue(still look great), when they get bushed you will have to run them full float anyway.
Are the pistons full float? |
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Plan B
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Rockland Co NY Status: Offline Points: 285 |
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The pins slide in and out of the pistons with ease and would fall out tilted to the side a bit. Is that what full float means? This is where i get lost not knowing enough basic engine knowledge.
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vinny
Supporter of TheAMCForum Joined: Jan/05/2012 Location: Calgary Status: Offline Points: 2837 |
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I admit to not too much experience with this piston pin topic but searching 1.001 wrist pin on the Internet comes up with some stuff.
Sleeving them means you have two surfaces that can creep and I'd try and stay away from that.
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tsanchez
AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303 |
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Clips or locks are used on the piston to retain the pin and it is allowed to spin on both rod and piston
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amx39068
Supporter of TheAMCForum Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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Bulltear's pistons have pin lock recesses that hold the pins in place. I have seen Tony's pistons and rods that he ran for 25 years with some very very hard miles and they are indeed still in as good shape as there they were when he first intalled them. On the other hand, conventional wisdom says you bush the end of the rods when you have floating pins but Tony didn't listen to conventional wisdom and it worked out fine.
There is a local marine machine shop in Mesa that bushed a set for one of the engines we did a couple of years ago and the cost was around $200 IIRC. I suspect you may have an issue with your Machine Shop telling you they won't warranty the engine if the rods aren't bushed because they aren't as brave and pioneering as Tony!
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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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tsanchez
AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303 |
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Many import cars are like this from the factory and so was the chevy 302, not a big deal just drill a hole in top of rod and keep clearance at .001-.0015 and it will be fine.
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390spirit
AMC Addicted Joined: Jun/28/2008 Location: U.S.A. Status: Offline Points: 1849 |
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the shop that does my machining bushes rods.....they did mine.
but just like Tony says will work just fine as long as the pistons have provisions for locks. http://precisionengine.net/ |
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Plan B
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Rockland Co NY Status: Offline Points: 285 |
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Dan you are correct sir!
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jeremy0711
AMC Addicted Joined: Dec/12/2008 Location: Southern IN Status: Offline Points: 1547 |
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Wow, $200 to bush the rods! I got a deal at 90 bucks! I don't know if those guys take orders through the mail or not. I used a local shop that has been in service a long time and uses older equipment but they have a great reputation. There are shops in town that you can eat off of the floor basically. I like my good ol' boy shop better. Guys like me that roll in the fancy ones every 4-5 years get second based service as their regulars came first in line. I waited for two weeks on my Ford heads that all they had accomplished was a tear down. They were suppposed to be done in a few days. Those heads actually required a bunch of work that they haven't even taken two seconds to even look at.
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