Hi chaps,

Sorry for the direct email and hope you can help me. I have a problem with my TBI and need to replace it as a matter of some urgency – due to go on family vacation next week.

It’s a 1991 Chevy P30 Motorhome with a 7.4L 454 TBI
Auto trans 4L80E. My engine variant ,7.4L(7.4N),V8(E.F.I.) 7.4N(L19)
Vin code is 1GBJP37N0M3301377
The Production casting number on the broken throttle body is 17091045 - was stock on the Motorhome.

I was on the verge of ordering a AC Delco replacement (17112563) but I phoned them to check and they gave me a different part number over the phone (17112557).

I have a 1991 truck parts catalogue (not sure it is Motorhome specific), found the reference to the production casting number on my broken throttle body and it says the replacement is yet another part number (17112569).

So, I have multiple suggestions (17112563, 17112557, 17112569) and not sure which one to try and get. There seems to be quite a price/availability differential as well. I hope to take the injectors and just switch them over to the replacement, so no injectors needed.

Would you be able to advise which one to go for? I’m based in the UK, so need to get this shipped over really quickly because due to leave for family holiday next week.

Thanks
Nick