Good match up? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Doc Harrel · 11-10-2009, 01:36 AM

I have a bone stock 400 sbc in a 68 stepside. The truck has a 400TH tranny and 4:11 rear diff. I would like to drive it to work, about a daily 6 mile round trip, but still be able to turn some good times on the track. I was thinking about boring it out to a 406, and maybe changing the gears ratio in the diff. What kind of suggestions do you guys have? Should I leave the differential gearing alone? Should I leave the engine alone? What would you do, or what have you guys done with similar setups?

Also...what kind of peak rpm can I expect to get out of a 400? 406?

11-10-2009, 01:36 AM	#1
Doc Harrel Registered User Join Date: Feb 2009 Location: Tucson, Az Posts: 25	Good match up? I have a bone stock 400 sbc in a 68 stepside. The truck has a 400TH tranny and 4:11 rear diff. I would like to drive it to work, about a daily 6 mile round trip, but still be able to turn some good times on the track. I was thinking about boring it out to a 406, and maybe changing the gears ratio in the diff. What kind of suggestions do you guys have? Should I leave the differential gearing alone? Should I leave the engine alone? What would you do, or what have you guys done with similar setups? Also...what kind of peak rpm can I expect to get out of a 400? 406?



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