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Old 11-03-2016, 05:12 PM   #12
b454rat
Senior Member
 
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
Re: Upgrading a stock 400sb

Not enough compression will result sluggish bottom end, and might fight a stock convertor. But I ran a 230 duration cam in a 400, stock TH400 and convertor and was fine. Thing had 200k plus miles and it ran pretty good....only other issue was the heads were the limit on lift, and every now and then I would snap a rocker arm...so I just kept spares and a small tool kit with me. Got pretty good and changing after a while lol...
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 6” lift
1999 GMC Yukon 350/4L60 4" SAS
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