Is it 95mm straight or does it bevel down to 87mm?

The entrance is a little larger ID than 95mm but the exit is 95mm. You will need an adapter to make this work on an l86/lt1 if that’s your intention.

ASIN	B07CJF9K8M
Auto Part Position	Inside
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#1,445,967 in Automotive ( See Top 100 in Automotive ) #1,874 in Automotive Replacement Fuel Throttle Bodies #13,082 in Automotive Replacement Fuel Injection Products
Body Material	Aluminum
Brand	GM GENUINE PARTS
Customer Reviews	4.4 4.4 out of 5 stars (21)
Date First Available	April 17, 2018
Exterior	Painted
Fit Type	Vehicle Specific Fit
Gas Type	Gasoline
Global Trade Identification Number	00808709757658
Inlet Connection Size	3 Inches
Inlet Connection Type	Threaded
Item Weight	2.78 pounds
Item dimensions L x W x H	7 x 11 x 5 inches
Item model number	12669871
Manufacturer	ACDelco
Manufacturer Part Number	12669871
Model	12669871
Mounting Type	Flange Mount
OEM Part Number	12669871
Outlet Connection Size	3 Inches
Outlet Connection Type	Threaded
Product Dimensions	7 x 11 x 5 inches
Product Grade	Replacement Part
Specification Met	OE
Style	Gerotor
UPC	808709757658
Vehicle Service Type	Car

GM Genuine Parts 12669871 Fuel Injection Throttle Body