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Old 01-09-2011, 10:24 AM
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Splayed Caps on a 406

I am building a 406, the block will be line bored, my question is should i have splayed caps installed? It will be a steel crank motor about 400+ horsepower.

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Old 01-09-2011, 10:31 AM
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It's not necessary unless it will be spinning faster than 5k rpm. Is it a 4 bolt or 2 bolt right now?
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Old 01-09-2011, 10:37 AM
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The engine will be expected to turn 6000+ the block is a 2 bolt now. I just thought that with having the block line bored i might as well put steel caps and do splayed caps.
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Old 01-09-2011, 12:02 PM
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The 2bolt blocks are strong enough to accommodate your use, dont waste your money. You will most likely spend 700 -900 bucks for the caps and machine work. You probably don't need to align bore, a honing of the mains usually all that is required.
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Old 01-09-2011, 11:54 PM
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I'd stud and line hone the 2-bolt caps and use it.

If you think that this won't be strong enough for what you plan and are seriously thinking about adding them, think of this - it is a $500 operation in my area plus the cost of the caps(another $100) - when you add that to the bore and hone, cleaning and crack check, deck cut charges, block filler - you are now very close($100-300) of just buying the Dart SHP block, which is tons stronger than even the best trussed up stock block could ever hope to be.

Guys are starting to realize by the time you need to add splayed caps to a stock block... you are right on top of the point you should actually be in a better block...and you are almost there to the cost of the better block in what you have in the stocker. Dart recognized this.

Circle track under 6500 rpm 2 bolt will last a while, 7500 rpm street/strip will live. Internal balance seems to help a bunch.
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Old 01-10-2011, 02:05 AM
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Before you spend any money in machine work have the cylinders sonic tested!!!
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