throttle body 85mm??
throttle body 85mm?? i bought this throttle body here at the parts area and the guy said its a 85mm
how do i determine if it is or it isnt the is a part number stamped on the side number is 23950
how do i determine if it is or it isnt the is a part number stamped on the side number is 23950
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OK there is alot of misinformation in here right now. A stock tb is technically 75mm from factory as that is what the diameter of the throttle blade is. But there is a ridge in front of the blade that is 71.2mm so air is restricted through this ridge. By porting a stock tb and removing this ridge it makes it a true 75mm tb.
75mm is the largest a stock throttle body can be ported to, without adding weld to the outside, boring the throat and making a new throttle blade. So if you have a stock casting tb then it can only be 75mm.
Every gm ls1 98-02, 04 gto, 97-04 c5, ctsv 5.3, 4.8 and 6.0's are all 75mm tb's. Ls2, Ls3, Ls7 run 90mm from factory and thats it.
EDIT: And a correctly ported stock 75mm tb is the best route for any ls1, ls6 intake as they flow more than out of the box 80mm tb's that aren't ported and use a restrictor to get into the 78mm inlet of the intakes.
75mm is the largest a stock throttle body can be ported to, without adding weld to the outside, boring the throat and making a new throttle blade. So if you have a stock casting tb then it can only be 75mm.
Every gm ls1 98-02, 04 gto, 97-04 c5, ctsv 5.3, 4.8 and 6.0's are all 75mm tb's. Ls2, Ls3, Ls7 run 90mm from factory and thats it.
EDIT: And a correctly ported stock 75mm tb is the best route for any ls1, ls6 intake as they flow more than out of the box 80mm tb's that aren't ported and use a restrictor to get into the 78mm inlet of the intakes.
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