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Old 12-23-2005, 10:04 AM
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355 vs. 377 SBC

Just so I can get this through my head correctly. If I had a healthy 355 for street use and it had, let's say 400 ft. lbs. of torque at a givin RPM. Would a 377 with the same cam, heads, etc., make at least the same torque as the 355? The reason I ask, is because people say 377's aren't really street engines. It is the same as a 350, though it has a 400 block for the big bore. Is it the big bore that makes it less streetable? I've had many 355's and yes you had to runlower gears, higher stall.etc........just wanted to know if the 377 was worse.........Thanks

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Old 12-23-2005, 10:12 AM
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All other things being equal it would make more Tq.
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Old 12-23-2005, 10:49 AM
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It not about what makes more torque it about where in the RPM range it's made. 377's with a short stroke make torque at a higher RPM, Which means a much lower gear. That takes out the "street" in street rod.
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Old 12-23-2005, 10:56 AM
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OK, it would make more torque, but would it be at the same RPM as the identical built 355 or would it still be an even higher RPM......?
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Old 12-23-2005, 11:08 AM
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Very interesting question. My thoughts are it would make more torque and at a lower RPM than the 355. The reason I say this is, it is a larger engine using the "same" parts. This means the cam will "act" smaller and the velocity through the heads would be higher. This only assuming everything being the same.

Now I know this was just a question, but to take advantage of the 377, you need to build it to RPM (so you wouldn't want to use the same cam, heads, intake, etc.. that you would on a 350). If not you will be better off with a 400 or 383. I think this is where the "not good" for the street thing comes from. If you have a 400 block why would you not want to use the extra cubic inches? Now it also depends on what "street car" it is going in. If it is a light car with say a 5 or 6 speed manual tranny and the right gears, it could be a blast to drive on the street. Now if it's a heavy car with an automatic, I think it would not be a fun street car.

Royce
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Old 12-23-2005, 11:20 AM
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That's right Royce, it will make more Tq...at a lower rpm AND a higher rpm.

man, I wish I was more word gifted to go into details. My science on my act's was 32...my english, well I won't mention
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Old 12-23-2005, 12:30 PM
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They have the same stroke. 3.48

The 377 has a 400s block/bore of 4.125+ and will accept bigger valves and induction which increases upper end breathing and tends to reduce the lower end due to lower VELOCITY through the ports at lower rpm. How many 377s have you seen with dual plane intakes???

They are correct:
If it were apples to apples on the heads and induction..... the 377 would STILL be 22 inches bigger and give you at least 25/25 more on power across the board.

edited added: Think of the super big bore, super short stroke Mopar 383. 4.250 x 3.38 It works with small valves!!!! Even moreso than the 377 SBC.

Last edited by xntrik; 12-23-2005 at 12:48 PM.
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Old 12-23-2005, 01:42 PM
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The 377 should make more torque at about the same RPM. The bigger bore may alter the breathing and improve low lift flow actaully shifting it down a bit in RPM.
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Old 12-23-2005, 02:26 PM
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By Desktop Dyno 2000 using the parts in my 406: the 355 and 377 make about the same peak HP, but the 377 always makes more torque.
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