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1957 D500 rebuild. Jump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
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tberd62 |
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Veteran Posts: 206 Location: California | I have my 325 Hemi motor torn down for a rebuild and seem to be having some problems locating pistons in 40 over. Egge is out and won't be making any soon. Falcon Global on ebay has the size but doesn't know if they are poly only. So, its a crap shoot if I order a kit from them. Are the pistons the same as a 325 poly? What should be the compression distance on the Hemi piston? Thanks in advance. | ||
56D500boy |
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Expert 5K+ Posts: 9855 Location: Lower Mainland BC | tberd62 - 2017-12-27 1:42 PM I have my 325 Hemi motor torn down for a rebuild and seem to be having some problems locating pistons in 40 over. Egge is out and won't be making any soon. Falcon Global on ebay has the size but doesn't know if they are poly only. So, its a crap shoot if I order a kit from them. Are the pistons the same as a 325 poly? What should be the compression distance on the Hemi piston? Thanks in advance. The factory piston PNs for the 56 315 and 57 325 D500 engines do not cross to non-hemi engines. Furthermore, they only seem to have come in Std size, 0.005 over and 0.020 over. (56-57D500PistonSizesAndPNs.jpg) Attachments ---------------- 56-57D500PistonSizesAndPNs.jpg (199KB - 111 downloads) | ||
tberd62 |
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Veteran Posts: 206 Location: California | My engine has .030 over in it currently. So, somewhere in the past there was a source. | ||
uncltank |
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Extreme Veteran Posts: 380 Location: Kennewick Wa | Is Hot Heads a no go? A friend got some parts for his 325 about 2yrs ago... | ||
tberd62 |
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Veteran Posts: 206 Location: California | I didn't know about them. I'll give them a call. Thanks for the info. | ||
DEH |
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Veteran Posts: 110 Location: Falcon, CO | Here is the link for the .040 over pistons for a 325 Hemi: http://www.hothemiheads.com/dodge/pistons_rods/pistons_cast_replace... Don H. | ||
Powerflite |
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Expert 5K+ Posts: 9604 Location: So. Cal | Stock compression ratios suck. I would purchase custom pistons instead. It will be another 3-4 hundred dollars, but well worth it for the extra compression. | ||
tberd62 |
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Veteran Posts: 206 Location: California | So stock compression is 9.25:1 What would you recommend taking into consideration that we only have 91 octane gas in California? | ||
mstrug |
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Expert 5K+ Posts: 6487 Location: Newark, Texas (Fort Worth) | I wouldn't go past 9.50 without octane boost. | ||
wayfarer |
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Elite Veteran Posts: 888 Location: Peoples Republic of Oregon | Cast pistons, from wherever, will be at the oem c/r and, keep in mind, that the listed c/r is very optomistic....rarely accurate. We sell custom forgings for most of the Hemi/Poly headed engines for about $800 so compare to the cost of castings to decide if an upgrade is worthwhile. We regularly use 10:1 in rebuilt Hemi engines w/o issues but limit the Spitfire to 9.5:1 for most customers. The fuel quality seems to vary around the country, odd in that it mostly comes from the same refineries..... If oem cast type pistons are desired then also look at Kanter as a supplier. I do believe that most castings come from the same manufacturer so the only difference is the markup. | ||
Powerflite |
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Expert 5K+ Posts: 9604 Location: So. Cal | I ran 10.5:1 in my 392 without issues. The 361 BB in my '58 DeSoto has 10:1 and even it does fine on Mid grade or Premium. I am not certain, but I would bet that the hemi could run 11:1 on Premium. I think the new motor I built for my '57 New Yorker has about 11:1, so we'll see how it does. Edited by Powerflite 2017-12-29 1:17 PM | ||
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