These are a direct fit con rod for all Toyota 4.0 Litre V6 1GR-FE V6 DOHC engines. Suits the Landrcruiser and Prado.We have customers making over 1000 RWHP with Spool Conrods.These con rods feature:High tensile 4340 forged steel2 Piece forgingHardness of HRC36-42Dowelled caps for precision alignmentX-RAY & Sonic testedQuenching and heat treatedShot peened100% MagnafluxedWeight Matched Sets + - 1 gramVacuum degassed to remove impurities.  All Connecting Rods come with ARP 2000 rod bolts fitted.