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Old 05-30-2011, 01:54 PM
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To pile it on a little more...

Originally Posted by LS-57
I believe it was John Lingenfelter (could be wrong) who built the "first" one in the '80's & they took off from there. The early ones used 350 rods (longer) with custom pistons.
The ONLY thing that would make any sense is if you are talking about a 383 SBC stroker. The 406 is a 0.030" over 400- and was "made" the first time a 400 engine was ever rebuilt, likely within days of when the engine was released into production in 1970.

Scat and others now have stroker kits to bring it to a 427 and 434.
To use a 4" crank in a production block requires a small base circle cam, clearancing, and at least a partial fill of Hardblok to keep it from leaking from where the clearancing hit the water jackets. All a 434 is, is a 0.030" overbore of the standard 400 block w/a 4" crank.

The factory 400 has 5.5" rods
You are wrong by 0.065".

FWIW, a 4" crank in a 0.020" over 4" nominal bore SBC block also nets you 406 cid.
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