406 stroker vs 421 stroker
Thread Starter
On The Tree
Joined: Apr 2010
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From: Dallas, TX
406 stroker vs 421 stroker I have a 4,244-4,314 lb chevy caprice with a stock sbc 400 in it. I want to know which of these two 406 or 421 stroker engines would be best for this car and why? The car will be a dd/street rod. 
Wallet friendly too, or just better? The 421 would have more torque down low to move a heavy car, and would be able to keep better street manners with the same amount of cam as the 406. How high of a stall/gears do you plan on running? Have you also considered a 434?
Thread Starter
On The Tree
Joined: Apr 2010
Posts: 142
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From: Dallas, TX
It really don't matter about the wallet, Which is Better? I haven't thought about a 434, and the gears are 373s and stall I guess about 2800 to 3000 somewhere around that. I want be able to run pump gas though.
I'd go for the larger cubes, consider the 434. It's easier to make streetable power from the larger motor, and a heavy car would benefit from the lower RPM power band.
On The Tree
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From: NORTHEAST
The 421's we have been building we have been able to use a cam with a 1.000 base cirlce and even at that we go tot the .903 lifters with the bigger wheel, bigger axel and bigger body it makes for more durable lifter over an .842 lifter.
X2 That would be any standard cam tunnel and standard pan rail block, Trying to get a 4.000 arm in a stock block you end up with a cam that looks like a pencil and lifters hate small base cirlce cams.
The 421's we have been building we have been able to use a cam with a 1.000 base cirlce and even at that we go tot the .903 lifters with the bigger wheel, bigger axel and bigger body it makes for more durable lifter over an .842 lifter.
The 421's we have been building we have been able to use a cam with a 1.000 base cirlce and even at that we go tot the .903 lifters with the bigger wheel, bigger axel and bigger body it makes for more durable lifter over an .842 lifter.
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Good torque can still be made from a 406 and it will be easier to get the 3.750 stroke in the block. I'll have to get the dyno sheets from my 406 and show the torque that it made. It really surprised me on the torque it made.
http://www.sonnysracingengines.com/e...p-new-for-2011
That one should do it
Al 95 Z28
