what is the center to center bolt hole distance?

3 3/8 inch center to center, 3.375 in thousands. The diameter of the water passage is 1 3/4 inch where the outlet meets the intake manifold.

Fit 1995 C1500 with 5.7L 350 ?

Should fit your 1995 5.7 Litre(350 cubic inch). I am using it on a 454 . Most all early V8 chevy engines have same water outlet bolt pattern, only difference is angle of the water neck varies. LS series engines ( 4.8, 5.3, 5.7corvette, and 6.2) are different.

Do you need to use the o ring gasket that goes on the thermostat with this?

Some intakes came with a deep groove designed for an o-ring to be put on the thermostat, others had a shallow groove designed for a paper gasket to sandwich between the thermostat and the housing. Use the right sealing mechanism for your intake.

902 694 Engine Coolant Thermostat Housing

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VT6391

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Specifications

ASIN	B01D8VJL0C
Backlight	No
Best Sellers Rank	#151,206 in Automotive ( See Top 100 in Automotive ) #223 in Automotive Replacement Engine Thermostat Housings
Brand	Dorman
Color	Black
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Touch
Controller Type	Iris
Customer Reviews	4.5 4.5 out of 5 stars (235)
Date First Available	March 21, 2016
Display Type	digital
Exterior	Ready To Paint If Needed
Global Trade Identification Number	00747214270804
Included Components	Thermostat Housing with Gasket
Item Weight	6.7 ounces
Item model number	902-694
Manufacturer	Dorman Products
Manufacturer Part Number	902-694
Material	Plastic
Model Name	902-694
Mounting Type	Wall Mount
OEM Part Number	4992KT; 6238; 6247; 814992; 84992; ch4992; CO34752; 10147884; 8-10147-884-0
Product Dimensions	3.78 x 2.76 x 3.74 inches
Shape	Rectangular
Special Feature	Lightweight
Special Features	Lightweight
Specific Uses For Product	Air Conditioner
Style	Modern
Temperature Control Type	digital
UPC	747214270804

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902-694 Engine Coolant Thermostat Housing

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