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No, it's not a good idea to change to 5.7 rods in a 400. IT'S THE ONLY IDEA! Or even 6.0in rods. Just to add the 5.7 rod to a 400, there is one super easy mod to do (you can do it at home). I would assume you will buy new rod bolts and have the big end resized. AFTER the new bolts are installed and BEFORE the engine is balanced, you need to grind some off the rod bolt head on the side facing the cam. Grind it at about a 45deg angle (or your machinist can do this). This provides clearance between the bolt heads and the cam lobes (this IS manditory. or 1 or more bolts WILL hit a cam lobe).

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Tom Parsons
 

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hey guys while he is at it could i use his old rods and a 400 crank in my 350 without changing pistons ? i want to stroke mine but don't want to buy new pistons to clear the valves/head.

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John Krenn
1970 malibu SS look-a-like well kinda
307/200-4r (soon to be 350 or 383)

Ft.Worth, Tx
 
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