Torque Converter & new 350 / 290 hp engine

[motorheadmike]

If that motor has Vortec heads a 3000 stall, 4.56 gears, and a .488" 292 cam will get that thing moving right proper.

 

[pontiacgp]

If you do have vortec heads a roller cam from a crate 604 or the ZZ4 which has the same cam works real nice with those heads...

 

[olds307 and 403]

The 290 hp has 8.5 to 1 compression, smog 76cc heads and a fairly big flat tappet cam. Basically a 220ish duration cam added to cheapest 350 GM offers.

 

[motorheadmike]

https://www.jegs.com/p/JEGS/JEGS-Pe...ortec-350ci-57L-Crate-Engine/5240244/10002/-1

 

[Turbolq4]

https://www.jegs.com/p/JEGS/JEGS-Pe...ortec-350ci-57L-Crate-Engine/5240244/10002/-1

I just spent two hours looking at random crate engines. Anybody want a 4G63T?? Turns out that Jegs has them. How about a ton of Subaru engines??? They have them too. Thanks Mike...

 

[olds307 and 403]

It could be that Vortec motor but I bet it is the cheaper flat tappet version.
https://www.jegs.com/i/Chevrolet-Performance/809/19355658/10002/-1

 

[Clarkwb100]

The converter is stalling at those rpm (1300-1500) not locking up. Converter stall is when it actually produces forward motion. Lockup eliminates the slippage of the converter via a mechanical clutch creating a more efficient mode of power transfer. If it's actually locking the 'verter at those rpm in low gears it would be lurching and bucking all over.

Converters are witchcraft and voodoo. So many things change how they act and perform under specific conditions.

I was so excited with your response a couple months ago I forgot to thank you! I appreciate your clear answer. Thanks

 

[Clarkwb100]

It could be that Vortec motor but I bet it is the cheaper flat tappet version.
https://www.jegs.com/i/Chevrolet-Performance/809/19355658/10002/-1

Yep it is the cheaper one!