This Allstar Performance camshaft thrust button is machined from steel with a black oxide finish and measures 0.940in long. It is designed for Big Block Chevy engines running a roller camshaft.Spec Sheet: Allstar Spec SheetCompatibilityENGINE-SPECIFIC: Big Block Chevy, roller cam version.FAQ What length is the ALL90055 thrust button?The ALL90055 measures 0.940in long. What engine and cam type does the ALL90055 fit?The ALL90055 is designed for Big Block Chevy engines running a roller camshaft. What is the ALL90055 made from?The ALL90055 is machined from steel with a black oxide finish. Is the ALL90055 the same as the ALL90053?No, the ALL90053 is the aluminum flat-tappet-style Big Block Chevy button (0.945in), while the ALL90055 is the steel roller-cam version (0.940in). Match the button to your camshaft type. {"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What length is the ALL90055 thrust button?", "acceptedAnswer": {"@type": "Answer", "text": "The ALL90055 measures 0.940in long."}}, {"@type": "Question", "name": "What engine and cam type does the ALL90055 fit?", "acceptedAnswer": {"@type": "Answer", "text": "The ALL90055 is designed for Big Block Chevy engines running a roller camshaft."}}, {"@type": "Question", "name": "What is the ALL90055 made from?", "acceptedAnswer": {"@type": "Answer", "text": "The ALL90055 is machined from steel with a black oxide finish."}}, {"@type": "Question", "name": "Is the ALL90055 the same as the ALL90053?", "acceptedAnswer": {"@type": "Answer", "text": "No, the ALL90053 is the aluminum flat-tappet-style Big Block Chevy button (0.945in), while the ALL90055 is the steel roller-cam version (0.940in). Match the button to your camshaft type."}}]}