Hey everyone I am looking into building a new engine for my car and I was wondering which would be a better option 383 stroker or 377 destroked, maybe some parts Ill need, price of build, MPG differences, streetability, etc. Im really lookin for some help on deciding which way to go. Also what would be a good tranny set up for this TH350 or TH400.

Im wanting to make right about 450 to the wheels
What about an LS1 383 what all would I need for that besides the parts for the swap

Thanks for your help

 

Got a question about the destroked 377...is that a 400 with a 350 crank?
I think a destroked motor should rev higher but you would lose low end torque. Correct me if Im wrong.
It all really depends on what you want to use the car for.

 

Are talking about a 400 sbc block? Need more information.

 

I can get a 400 cheap for the 377. Its meant to rev high I believe. The 383 would be a 350 block. Im wanting a daily driver that will stomp on almost everything out there

 

If you can get the 400 for cheap, just use that. Bore it .030 over and use the longer 350 rods for a long rod 406.

 

To make a 377, you use a 400 block (If you can still find one). You need a 350 crank with some bearing spacers to fit into the 400 block. 350 con rods, 400 pistons.

The slightly larger bore of the 400 block will make a little more HP but not as much torque if all things are equal but it will also unshroud larger valves in the head. You'll also need to drill steam holes in any heads you use.

377
Pros: Large bore, short stroke engines are always slightly better at making top end power. A typical NASCAR engine is based on the same design although they don't use production engines.
Cons: Finding a 400 block. Main bearing spacers for the crank are not cheap.

383:
Pros: Available from just about everyone. Aftermarket stroker cranks are cheap so you don't need to find an old 400 cast crank. Plenty of kits available to make it in a 1 or 2 piece rear main block. Makes more torque than a 350.
Cons: If you're going to use a crank out of a 400 to make a 383, just build the 400.

 

 

Thanks a lot AlkyIROC that helped out a lot. I think I might actually do a 383 LS1. A buddy of mine is going to sell me his engine for $500 when he goes to get a new one.