Thread: newbie sbc400 question

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Gears are probably the biggest thing. If you're trying to run a 2.70 rear-end ratio, you'll still feel like your lugging a tank around behind you. A 400SBC will make plenty of torque with that cam. It's the cam I'm planning to use in my 377SBC. It was also recommended to me by a professional engine builder for good low-end torque and also the biggest cam available for a stock converter.

I'd at least pull the rear cover and count the teeth to establish what ratio is there. If you're under a 3.00 ratio, it might be a good idea invest in a set of gears....maybe a posi unit if you have the budget for it.

A little off topic, but that big TH400 behind your motor is eating up some power too. They are heavy heavy heavy and eat quite a bit of power compared to some lighter duty trannies like the TH350 and 700R4. I'm not suggesting that you change the tranny out by any means because the 400 is an incredible piece of work, but that could help explain as to why your not getting the giddyup that you'd like.