[ambmech1]

What stall speed torque convertor would you recommend for this setup?
1970 tempest YS 400 stock 13 heads
Turbo 350 with shift kit
Headers
355 posi
Crane energizer cam. Spec in pic.

If I leave the stock torque convertor am I going to lose a lot of performance?

[goatless]

What is your intended use for the car? I'm assuming mostly street use?

I'd go for a tight 2500 stall. I've had good luck with the Hughes GM25, others are going to recommend a Continental, but they're a bunch more money. Hughes has a BOP version of the GM25 that's built for the torque characteristics of a Pontiac. I ran one for years- it drove like a stock converter in normal driving.

Stay away from the off the shelf stuff from TCI, B&M and the like- they are way loose for around town driving.

[screamingchief]

Agree ^^^^,X2.

2400 to 2600 would be about right.

And yeah,dont go cheap,buy a good unit.

Originally Posted by ambmech1

If I leave the stock torque convertor am I going to lose a lot of performance?

Well,not a ton,but it's enough that most of us would go for it as the gain for $$$ spent is pretty good,and labor usually is'nt a deal breaker either.

Especially true with the 3.55 rear gears.

Bret P.