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Original Message
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| piston weight/rebalancing/Silvolite problems |
| By David - 10/29/2004 4:30:16 PM; IP 167.6.245.98 |
| Beware of Silvolite pistons. The Silvolite tech line told me that their pistons are the same or lighter in weight than the original ford pistons. Based on that my machine shop(who also told me they should be "about the same weight") ordered a set of 1131's and honed the block to match. After the fact, I purchased a new scale and weighed the pistons. Original Ford 1967 390 4V piston: 653 grams. Silvolite 1131(.040 oversize): 735 grams. As a reference Speed pro forged 2291F40 are 679 grams. The weight is piston only, no pin. I emailed Silvolite to see if I got a defective set and have received no response. Being that much heavier I'm of course concerned about balance. Has anyone used these pistons with stock 390 crank and rods without rebalancing? What was the result? Any vibration problems? I hate to go to the cost and risk of heavy balancing if I don't have to. I plan to run a stock C6OZ-B cam and limit rpm to 5000. Any help would be greatly appreciated. There must be a lot of people that have used these same pistons. Thank you in advance. |
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