Extra thick. Not stock. Check thickness of core and tanks prior to purchase. For extreme cooling and ground up builds. 1000 HP rating.<br><br>20 inch core is the OEM without air setup. for the 23 inch with factory air length, see other listings<br><br><br>Core Dimensions: 17 x 20 3/4 <br>Overall Dimensions: 19 1/4 x 28 3/4 - including tanks and bracketing<br>Hose Locations: In -Driver/Out -Pass<br>Core Thickness: 2-3/4<br>Tank Thickness: 3-1/8<br>Rows: 4<br>Tank Construction: Polished Aluminum<br>Core Construction: Aluminum<br>Inlet Diameter: 1 1/2<br>Outlet Diameter: 1 3/4<br>TOC: 1/2" 20 STRAIGHT, THREAD G1/4 <br>EOC: NA <br>Mount: Flange Mount<br>Horizontal - 27 1/4<br><br><font class="HiliteFONT">Suggested Add-Ons:</font><br>Thermostat Relay Kit (<a href="http://www.radiatorexpress.com/product.asp?part_id=221453" target="_blank">SKU 221453</a>) <br>Overflow Tank (<a href="http://www.radiatorexpress.com/category.asp?cat_id=R023" target="_blank">See Category</a>)<br>One 16" (<a href="http://www.radiatorexpress.com/product.asp?part_id=221446" target="_blank">SKU 221446</a>) or 2 x 10" (<a href="http://www.radiatorexpress.com/product.asp?part_id=221448" target="_blank">SKU 221448</a>) Electric fans recommended for this core size<br>Electric Fan Shroud Kits (<a href="http://www.radiatorexpress.com/category.asp?cat_id=R024" target="_blank">See Category</a>) for alternate mounting of fans<br>