If the vendor that sold you the shortblock says to use a 10355, use the 10355.

It is if the bearing clearances are loose and the OP doesn’t want 10psi of oil pressure at idle.

Not doubting you Patron, but Tony has changed his ways these days. During my build, he told me a couple of times that a high pressure pump wastes hp. He sold me a std pressure pump, that he ported for more volume.

Bearing clearance issues. Without the issues, Tony would rather sell you a std. pressure pump for max effort build. At least for me he did anyway.

Ive never read anything bad about those pumps. The cavitation issues with the LS pumps are supposedly eliminated with these. Prolly worth swapping over, if and when rebuild time rolls around.

No one ever talks about their pumps, but i run a schumanns high volume with their proscreen pickup tube and i have been nothing but pleased. I also have no o-ring on the pickup tube to worry about
https://www.carshopinc.com/product_i...130999/LSPROXV

You want looser clearances with more high performance applications. When you loosen the clearance, oil pressure will drop, so you need a higher volume pump to get that pressure back. From a customer standpoint, if something went wrong with the engine, I wouldn’t want the warranty voided because I didn’t use the tecommended oil pump.

I would think Tony knows better than to make a blanket statement like that. People are driving 1000whp setups on the street and something like that shouldn’t be built with factory bearing clearances. Aluminum blocks are especially bad about pressure drops since they expand so much with heat.