evans280z Posted August 28, 2006 Share Posted August 28, 2006 i have a 400sbc in a 78 whats the best rearend 3:54/3:90 to go with for 1/4 mile racing Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted August 28, 2006 Share Posted August 28, 2006 the answer depends 0n factors like the cam,compression ratio, heads and intake youll use, generally the 3.90 ratio would be my choice on a well built street strip combo example build the 400 with 10.5" cpr similar to this and youll get good results with a 3.90:1 rear gear ratio with a manual trans or useing a 4000rpm stall converter 385 Cu.In. 10.5:1 cpr GM 4 Bolt "010" Block 4.04 Forged SRP pistons -16cc Eagle Cast 3.75" Crank Crower 6.0" 4340 I beam rods Crower Billet Steel ROLLER Cam 254/257 @ .050 .712 lift w/ 1.6 rockers 108* LSA installed at 104* Jesel Shaft Rockers 1.6:1 PSI Springs 230# closed, 620# open Super Victor Intake ported to match heads, Fel-Pro 1209 Wilson Manifolds 1.5" carb spacer Holley HP950 Carb, 79-81 jets, .055 air bleeds all the way around MSD Pro-Billet Distributor Custom Stepped headers 1.75 - 1 7/8 - 2" Iron Eagle Platinum 230cc Heads CNC'd by M2 Racing 320cfm @ .700 333 cfm @ .800 66cc chambers 42* total timing 110 octane on dyno will run 91 on street It's a custom billet steel ROLLER cam. Youll need to order one 282/286 adv 254/257 @ .050 .445 lift @ lobe .712 lift w/ 1.6:1 rockers 108* LSA 104* ICL Solid Roller 450tq 580hp http://i5.photobucket.com/albums/y197/stevemc1979/finaldyno.jpg http://i5.photobucket.com/albums/y197/stevemc1979/finaldynonumbers1.jpg http://i5.photobucket.com/albums/y197/stevemc1979/finaldynonumbers1.jpg http://i5.photobucket.com/albums/y197/stevemc1979/finaldynonumbers2.jpg http://www.crower.com/misc/contact.shtml Quote Link to comment Share on other sites More sharing options...
evans280z Posted August 28, 2006 Author Share Posted August 28, 2006 bored 40 over,flat top pistons, 300hp double hump heads,roller cam,750 carb Quote Link to comment Share on other sites More sharing options...
Phantom Posted August 28, 2006 Share Posted August 28, 2006 And what are you running for a transmission and tires? You need to provide all the information. GIGO Let's see if you're serious enough to provide complete information on your set-up in order to get an even remotely correct answer. Quote Link to comment Share on other sites More sharing options...
evans280z Posted September 1, 2006 Author Share Posted September 1, 2006 running 350 trans,8in slicks Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted September 1, 2006 Share Posted September 1, 2006 Well, my build is; 3.75 stroke eagle crank 6 inch Eagle rods Lunati 14:1 4.155 bore pistons AFR 220 heads Comp solid roller .645 lift, 260 duration Edelbrock Victor E MSD 7AL2 S&S long tube headers 4000 stall PG 4.30 gears dyno'd at 690HP! Quote Link to comment Share on other sites More sharing options...
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