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Wiesco pistons |
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Nickyb546
AMC Apprentice Joined: Oct/29/2021 Location: Chicagoland Status: Offline Points: 30 |
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Posted: Jan/17/2022 at 8:01pm |
Hi guys I recently ordered a set of Wiesco pistons for a 390 rebuild it seems that the wrist pins are designed to be full floaters at a pin size of 1.000 I’m curious has anyone used these on a stock rod
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2427 |
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You have no need for them unless you have the rods floated (reamed out) to allow the need for the spirolox to be used. The pistons are made so you can use them stock press or a floated rod.
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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Out of curiosity, are you using custom or off the shelf pistons? 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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Nickyb546
AMC Apprentice Joined: Oct/29/2021 Location: Chicagoland Status: Offline Points: 30 |
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Off shelf ones
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flejl
AMC Apprentice Joined: Nov/15/2021 Location: PA Status: Offline Points: 177 |
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If you do not mind, I have a question...
I am not trying to hijack this thread and I am thinking the questions I have fit in here...
At some point I will be rebuilding a 360 to put in my Javelin in place of the existing 304 and have been thinking about Wiseco forged pistons and Molnar connecting rods instead of cast replacement pistons and stock rods. My thinking is the factory cast rods seem to be a "weak link", prone to breaking, and I am guessing the cost of having them checked, new rod bolts installed, and balanced, the old rods will end up being close to the cost of the better rods, so why not just go with forged rods? In regard to pistons, if going to forged rods makes sense, then for a couple hundred more why not go with forged pistons for the same reason? Thoughts. opinions, experiences? , and having the whole rotating assemble rebalanced |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7902 |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6755 |
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Unless you are prepping the cast rods yourself your logic is sound.
For a street engine, you can still buy new cast connecting rods and 9.5:1 cast pistons for 2/3 the cost. They show up on e-bay from time to time, actually cheaper if found in a complete engine kit.
Connecting rods have a life cycle limit and you can with some degree of certainly tell if an AMC connecting rod is close to it's limit by just measuring. A typical street driven cast connecting rod will have the large bore stretched 0.001" to 0.0015" in 100,000 miles of normal driving. I'd prep and reuse these rods. If the connecting rod has 0.002" or over stretch, throw them away, they have been abused. So when you have the motor apart, have the large end of the rods measured and if under 0.0015" stretch, put them up for sale. A person was selling 3 sets of unknown condition for $80 each. Offset the cost of your new rods a little. |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7902 |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6755 |
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You can buy 343 pistons and there have been times that you see 9.5:1 AMC 360 pistons for sale. A quick search and all I see now is 343 pistons but no cc number to determine the SCR.
Most all will have 1.580 CH so you have to take that into account. There were new cast AMC rods for sale last week, but don't see them now. I was thinking of buying a set. RockAuto had cast rods last year but just checked and not listed any more.
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7902 |
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