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Old 09-21-2007, 08:38 PM
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406

im going to build a 406 this winter i race every weekend im going with a forged piston will the stock rods be ok if not does the block have to be notched for 5.7 rods

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Old 09-21-2007, 11:05 PM
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The short rods are okay, if they are magnafluxed, shot peened, new rod bolts, and resized. a 5.7 rod is far better, run a small base circle cam and you`ll have more clearence, but you still will have to do a complete mock up and check all the clearences, and remember, heat brings expansion, so is sometimes a good idea to add a few thousanths. We ran the stocker 400 rods with good success and they were just that, stock, but we didn`t rev it over 5500 and I think we got lucky. It`s better to use the longer rod due to the added rod ratio, the short rod is so short it out runs the flame front on the power stroke at upper rpm.
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Old 09-23-2007, 08:58 AM
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The 5.7 rods are a better choice they are stronger. You will likely need to cam clearance the rods.However they can be purchased from speedway motors, midwest motorsports etc. for about $10.00 with the clearancing already done the rods resizes magnafluxed and good bolts installed.We run them in dirt track engines all the time at 7200 rpm no problems in a 406.
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Old 09-23-2007, 02:36 PM
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406

thanks for the help
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