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12-02-2002, 04:39 PM
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400 SBC Question
If you upgrade a 400 from the stock 5.56 rods to the 5.7 rods do you have to clearance the block? Is there a cam clearance problem?
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12-02-2002, 07:44 PM
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[quote]Originally posted by MI2600:
<strong>If you upgrade a 400 from the stock 5.56 rods to the 5.7 rods do you have to clearance the block? Is there a cam clearance problem?</strong><hr></blockquote> No clearance problems. New pistons for sure. If you are going to buy new pistons and rods, go for 6" Rods. Unless you intend to use a stock GM rod that you have laying around. An aftermarket set of 6" rods and pistons are cheap. The increase in torque is well worth it.
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12-02-2002, 07:45 PM
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Yes to both questions, will also need a custom compression height piston. but why go to a 5.7? we went to a 6 inch rod, was worth it too. I think if you run a small base circle cam there may not be a clearence problem but don`t quote me on that. I just rechecked this post and Info says no problems, we used a Scat crank and had to grind for clearence on both in a 383. Dunno if stock cranks are different.
[ December 02, 2002: Message edited by: DoubleVision ]</p>
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12-02-2002, 07:53 PM
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yes you can run into problems with the 5.7 rod, it depends on the block and the cam, i have built 400's that did not have a problem and i have had them hit everywhere, if you have a problem its usually the very top of the rod bolt hitting, this can be solved by grinding the outer edge of the bolt head at an angle , grind the bolt back towards the shank, usually 1/16" and take the outer edge of the rod bolt seat. this will clear most street cams, grind the lower cylinders at the reliefs and across the bore on the other side over about 1 1/2" wide to clear the oposite side rod. if you have one that hits it is hard to beleive some don't, but thats mass pruduction for you.
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12-02-2002, 08:04 PM
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I guess I need to be more specific with my posts. Nearly all aftermarket rods are designed with extra clearance.
As I mentioned before but did not communicate it properly, IF you are using a stock GM rod. You will need to check for clearance. A 383 is a bit different than a 400 also as far as clearance.
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