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Old 03-21-2011, 07:21 PM
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406 vs 377 small block chev

hi my name is mario i am currently building a drag car from a mercedes benz 300 coupe and would like to ask your opinions on the following engine combinations. i have a 400 small block chev that iwould like to put in the car. the combination is with a 700r4 trans, an 8.8 diff from a mustang
the consern is rpm

your thoughts would be appreciated


mario

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Old 03-21-2011, 07:24 PM
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And exactly what do you mean your concerns are RPMs ?


Cole
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Old 03-21-2011, 07:40 PM
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Originally Posted by eloc431962
And exactly what do you mean your concerns are RPMs ?


Cole
i understand that the 400 has a poor rod ratio so going to the shorter throw makes sense but when i run the engine on a symulator it tells me the piston speed is to high and failure is highly probable. im going to use aftermarket rods and pistons to help lower the recipricating mass but is 6500 rpm to high
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Old 03-21-2011, 07:45 PM
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Quote:
Originally Posted by mcc1
i understand that the 400 has a poor rod ratio so going to the shorter throw makes sense but when i run the engine on a symulator it tells me the piston speed is to high and failure is highly probable. im going to use aftermarket rods and pistons to help lower the recipricating mass but is 6500 rpm to high
IMHO no 6500 is not to high someone may say different but i know with my 408 6500 is easy. 5.7 x beam rods flat top pistons dart iron eagle heads and more. I guess something to think about is just how often are you going to be bouncing off 6500 RPMs anyway.
JMO


Cole
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Old 03-21-2011, 07:55 PM
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every weekend weather permitting
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Old 03-22-2011, 05:44 AM
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Build your 400. Use 5.7 rods. Have the bottom end balanced by a good shop and you`ll come out alright.
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Old 03-22-2011, 11:02 AM
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The bigger concern is your transmission choice. There's no sense in running a 700 when a TH350 will do a better job and cost much less.
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Old 03-22-2011, 09:19 PM
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Unless that 700 is built,it isn't going to live long.
Shane
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Old 03-22-2011, 10:29 PM
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How much street use are you planning? If not alot id go powerglide with some 4:10 or higher gears
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