Z28-Vortec

iTrader: (4)

Hello,

Hopefully someone can answer this, googled for an hour with no luck.

I am trying to find the actual throttle body size in mm of the 5.3L truck motors.

I know that the LS1 is 78mm, but can't find anything on the 5.3L Throttle body size. Is it the same size?

Does anybody know?

Thanks

chrisfrost

iTrader: (8)

When You say the LS1 is 78mm , have You measured it ? Because I believe it's actually closer to 75mm and the LM7 5.3L throttle body at least Mine was 70mm in factory form . That's actual measurement , not sure what They list it at . I ported mine to 74mm and polished the sh_t out of it .

Z28-Vortec

iTrader: (4)

When I was searching the only size for the LS1 I found was 78mm, but that could be wrong also. I haven't found a place that states the actual dimensions either.

Thanks for the help, if it isn't that much differences anyways I'll just port and polish one.

RezinTexas

my '04 LM7 DBW throttle body was 74mm

96capricemgr

iTrader: (1)

I believe they got larger yet on the later motors.

Z28-Vortec

iTrader: (4)

K, I was debating a LS1 throttle body or a 5.3l one. Since it doesn't seem like much of a size difference I'll just get a 5.3l and port and polish it. Budget build anyways.