- Oct 7, 2007
- Amherst, NY
- 1996 Torch Red Coupe (Prior 1988 and 1989)
The radiator cap that is on my 1989 L98 is an AC Delco RC-44. Cap states 17 PSI. I've confirmed that is the right cap for the L98 using several different vette parts catalogs. Yet the GM service manual states the cap pressure relief should be 15 PSI. After a little more research it looks like the LT-1 uses a 15 PSI rated cap (RC-27 or RC-36). An aftermarket cap at AZone is rated at 16 PSI, and is the same cap for either the L98 or a LT-1. I'm not sure a few PSI makes any difference, but a little surprised that the GM manual states 15 PSI when the recommended cap is 17 PSI.