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Old 08-15-2010, 09:07 PM
69CSTchevy 69CSTchevy is offline
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SBC 400 -- 5.7 or 6" rods..???

Althought I have built more than 20 "street stock" motors..this is my first shot at a "performance" motor. I have a 4 bolt main 400SBC block, .030 over. I got it with a set of SCAT 6.0" rods. I plan on a SCAT 9000 crank for the build, & have a set of new ProComp 64cc heads & an aluminum intake w/750 carb. Desktop dyno says with the cam selection it should run around 500HP w/480FP.This is a high torque / low RPM build street motor (5200 - 5500 RPM max) My question is this...everyone tells me to build it with the 6" rods..not 5.7"...but noone can tell me "Why..??" What is the reason for the longer rods & associated pistons for them..?? (This will be running right at 10:1 compression)
Any help or education provided will be greatly appreciated...I learned a long time ago to ask all those "stupid" questions....Thanks again for your help.
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