my new Mantons should be here tomorrow would hate to see something like that happen
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Before you try another take a good flashlight and have someone turn the engine over to make sure the pushrods are not rubbing on the block or heads.
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I'd call up Manton and order a good set.
If you bought the parts seperately and married them together then, unfortunitly the burden of responsibility lies on you (the end builder).
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That to me looks like a brittle break - could be the steel was tempered wrong
On eof my freinds had the same thing happen on another set of Smith Bros but it broke at the very top under the ball cup end, mine had a defect in the material where it broke 
I now have Mantons in all of my motors, PM if you want a set. I'm a dealer for all three companys 
Quote:truer words were never spoken! i don't think i've ever seen a pushrod failure that wasn't due to some exogenous issue. check everything. betcha find a problem other than spontaneous failure.
I'd start looking at the entire valvetrain before making any calls. How close do you run to spring coil bind? I'd throw an adjacent pushrod in the problem ho le and measure lift, watch trajectory during motion. Take a spring compressor (jesel-style) and see what addl. travel you have until C/B via the dial indicator. Get back with us.
should know something from Trend next week!
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See if you can look thru the spark plug hole with a good bore scope , check the exhaust relief in the piston for a contact mark, You wont always bend a valve with piston to valve contact, We broke a push rod in the middle like that pic of yours, turned out to be a guide that was too tight, I ran this engine for 2 weeks on and off at the shop and it was fine, broke the push rod on the return road after the first pass, I ended up pullin the heads cause I couldn't find the problem, I bought a good bore scope the next day
neither of us could see anything on the piston or the valve! Neat tool to have! laid a straight edge across the retainers etc. and all are straight! just trying to be as fair as possible here... we will see what Trend says and go from there now! 
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That to me looks like a brittle break - could be the steel was tempered wrong
I worked in a specialty steel plant and it never took us that long to test our product. I surely hope Trend is a company we can still trust to make a great product.
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I'd start looking at the entire valvetrain before making any calls. How close do you run to spring coil bind? I'd throw an adjacent pushrod in the problem ho le and measure lift, watch trajectory during motion. Take a spring compressor (jesel-style) and see what addl. travel you have until C/B via the dial indicator. Get back with us.
Quote:Well... its still a valid question... unless I misunderstood the long YB trash post
Sledgie, did ya run the engine with the offset lifters on the exhaust side, the 4 wrong ones
Quote:Yep sure did... I missed that one all my fault and it had nothing to do with the pushrod deal ! got the right lifters in there now and im up and running again yes trend sent me a couple extra pushrods with a "disclaimer" for some reason as I know performance parts/ warranty is always a sticky subject! I knew something was up with the lifters way back when and just went by what supercomp said as I never messed with offset stuff before but it took until I emailed Bigtime a pic and the offset is supposed to be towards the exhaust lifter not away as listed in the post below! I actually had the lifters right in the block (the 4) in this old thread and the block has been clearanced for all the intake side of the lifters now for pushrod clearance... yep you posted in there alsoQuote:Well... its still a valid question... unless I misunderstood the long YB trash post
Sledgie, did ya run the engine with the offset lifters on the exhaust side, the 4 wrong ones
everyone will have there opinion on ALL parts Mfgs one way or another... I am up and running and going for that 9 on pump gas and radials real soon and im gonna leave it at that Quote:
...just went by what supercomp said as I never messed with offset stuff before >>>BUT<<< it took until I emailed Bigtime a pic and the offset is supposed to be towards the exhaust lifter not away as listed in the post below!
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...just went by what supercomp said as I never messed with offset stuff before >>>BUT<<< it took until I emailed Bigtime a pic and the offset is supposed to be towards the exhaust lifter not away as listed in the post below!
I knew it!!! It was Supercomp's fault all along for not making certain you understood what he told you. I doubt he'll let you throw him under the bus again. I will give big props to Bigtime for being patient and helpful. I doubt this post will change how you operate but, as a business I personally would not do business with you based on how you've been posting during the whole process of your build. IMO you have bashed BEST, and Trend and then backpeddled. Yet the truth is not out. Noone, including you, knows what the real reason of the failure is because you have not taken the correct steps to validate measurements during building. I really hope you take this constructively and we move on because it appears you have built a cool car there. People here have been willing to help with good advise etc. so, you can do it yourself, and save or have some satisfaction.
It took about 5 seconds to blame Trend and 3 weeks to finally admit he screwed up. What's the big deal, we all have and will hopefully live to do it again. Live, learn, and try again. You have a very nice car that runs great.!!! Now go enjoy it.
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I still have never seen one snap in the middle like that. I used to run 3/8ths .135 wall manleys and never broke one.
I now have 7/16ths .165 walls and picked up 700 rpm. So my old ones were flexing.
No kidding..........man that really makes one think about this stuff. How much spring pressure you running on that beast.
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...(do a search hardcoreb). They sold me the heads... then sold me the T&D rockers. the T&D rockers they sold me would not clear the spring package they put on the heads (yes I posted about this in the past) I sent my heads back and Best Machine made it right! Great company thanks Pete
Quote:Hmmm..... 700 turns on just a push rod change...Quote:
I still have never seen one snap in the middle like that. I used to run 3/8ths .135 wall manleys and never broke one.
I now have 7/16ths .165 walls and picked up 700 rpm. So my old ones were flexing.
... Wow 
Quote:Quote:Hmmm..... 700 turns on just a push rod change...Quote:
I still have never seen one snap in the middle like that. I used to run 3/8ths .135 wall manleys and never broke one.
I now have 7/16ths .165 walls and picked up 700 rpm. So my old ones were flexing.
