Just lost the pump in my '89 TA. I'm also at the point of rebuilding the motor to make some more power.
I have an LT1 and plan on trickflow heads and possibly stroking it to 383..

A stock replacement here gets me a Bosch fuel pump but I'm wondering at what point should I consider a higher volume pump?

Thanks.

 

I am interested in this as well! I would like to know for what I could bump my nitrous up to.

 

I'd say go ahead and throw a Walbro 255 in there and call it a day. I'm sure a healthy, aftermarket-headed 383 LT1 will thank you for it!

 

I believe its rated at 150 lph. A 255 lph pump supports 600 hp. A 150 should do 400. Some say 450, as 150 lph is close to 248 lbs /hr fuel and by calculations you get a theoretical max of 475-500 hp but that seems optimistic to me. Also assumes 100% duty cycle on injectors. 400-450 is abit more realistic and you maybe within that realm of power with a 383

 

Thanks.. sounds like I'll play it safe and upgrade.. Always good to check, often bigger doesn't always mean better or is necessary.

 

I actually ran my Walbro 255 with my stock TBI 305 motor for a couple of years because I knew I would be putting a 355 Tuned Port motor in soon. The stock TBI fuel pressure regulator kept the pressure where it needed to be, even with the high pressure/high volume pump, so it wasn't a problem.