{"id":2023,"date":"2026-04-05T11:33:33","date_gmt":"2026-04-05T11:33:33","guid":{"rendered":"http:\/\/australianholden.com\/?page_id=2023"},"modified":"2026-04-17T04:25:54","modified_gmt":"2026-04-17T04:25:54","slug":"complete-hz-holden-restoration-parts-checklist","status":"publish","type":"page","link":"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/hz-holden\/complete-hz-holden-restoration-parts-checklist\/","title":{"rendered":"Complete HZ Holden Restoration Parts Checklist"},"content":{"rendered":"\n<p><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/\">H Series Home<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/hz-holden\/\">HZ Holden<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/amzn.to\/4cqplxi\">HQ HJ HX HZ Repair Manual<\/a><\/p>\n\n\n\n<p>The HZ Holden (1977\u20131980) is one of the most misunderstood but <em>best-driving<\/em> classic Holdens ever built. From a restoration point of view it has major mechanical differences to earlier H-series cars, especially with the introduction of Radial Tuned Suspension (RTS). <\/p>\n\n\n\n<p>The HZ Holden represents the final and most refined evolution of the classic H-series platform. While it shares visual DNA with the HQ\u2013HX range, the HZ introduced Radial Tuned Suspension (RTS), revised braking systems, updated interiors, and further emissions changes.<\/p>\n\n\n\n<p>If you\u2019re restoring an HZ Kingswood, Premier, Statesman, Sandman, One Tonner or Monaro, this checklist will help you avoid the common trap of buying incorrect HQ\/HJ parts that don\u2019t suit the HZ\u2019s unique setup.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HZ Holden Engines &amp; Drivetrain<\/h2>\n\n\n\n<p>By the time HZ arrived, Holden had refined its emissions-era engines and improved drivability compared to HX.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Factory Engine Options<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>173ci Red Motor<\/li>\n\n\n\n<li>202ci Red Motor<\/li>\n\n\n\n<li>253ci V8<\/li>\n\n\n\n<li>308ci V8 (ADR27A compliant)<\/li>\n<\/ul>\n\n\n\n<p>Key HZ note: Many engines received revised carb calibration and ignition tuning to work with RTS and improved braking.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Engine Restoration Checklist<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Six-Cylinder (173 \/ 202)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pistons, rings &amp; bearings<\/li>\n\n\n\n<li>Timing chain &amp; gears<\/li>\n\n\n\n<li>Oil pump<\/li>\n\n\n\n<li>Water pump<\/li>\n\n\n\n<li>Full gasket kit<\/li>\n\n\n\n<li>Stromberg or Rochester carburettor rebuild kit<\/li>\n\n\n\n<li>Engine mounts<\/li>\n\n\n\n<li>Emissions hoses &amp; fittings<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">V8 (253 \/ 308)<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low-compression pistons<\/li>\n\n\n\n<li>Camshaft suitable for emissions-era heads<\/li>\n\n\n\n<li>Timing set<\/li>\n\n\n\n<li>Oil pump<\/li>\n\n\n\n<li>Quadrajet carburettor rebuild kit<\/li>\n\n\n\n<li>Harmonic balancer<\/li>\n\n\n\n<li>Exhaust manifolds<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Transmission &amp; Differential (HZ Holden)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Factory Gearboxes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>3-speed manual<\/li>\n\n\n\n<li>4-speed M20 \/ M21<\/li>\n\n\n\n<li>Trimatic automatic<\/li>\n\n\n\n<li>Turbo-Hydramatic 400 (308 V8)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Driveline Parts Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clutch kit &amp; spigot bush<\/li>\n\n\n\n<li>Gearbox rebuild kits<\/li>\n\n\n\n<li>Shifter bushes<\/li>\n\n\n\n<li>Tailshaft uni joints<\/li>\n\n\n\n<li>Differential bearings &amp; seals<\/li>\n\n\n\n<li>Salisbury LSD (where fitted)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Fuel &amp; Cooling System (HZ Improvements)<\/h2>\n\n\n\n<p>HZ cooling systems were marginally improved but still benefit greatly from restoration or upgrades.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fuel System<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Replacement fuel tank<\/li>\n\n\n\n<li>Fuel sender unit<\/li>\n\n\n\n<li>Ethanol-safe fuel hose<\/li>\n\n\n\n<li>Mechanical fuel pump<\/li>\n\n\n\n<li>Emissions control hoses<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Cooling System<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiator (HZ shroud design)<\/li>\n\n\n\n<li>Fan clutch<\/li>\n\n\n\n<li>Thermostat<\/li>\n\n\n\n<li>Heater core<\/li>\n\n\n\n<li>Correct radiator hoses<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Radial Tuned Suspension (RTS) \u2013 HZ Exclusive<\/h2>\n\n\n\n<p>This is what sets the HZ apart \u2014 and what catches many restorers out.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Suspension Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RTS-specific coil springs<\/li>\n\n\n\n<li>Matched shock absorbers<\/li>\n\n\n\n<li>Control arm bushes<\/li>\n\n\n\n<li>Ball joints<\/li>\n\n\n\n<li>Rear trailing arm bushes<\/li>\n\n\n\n<li>Panhard rod bushes<\/li>\n<\/ul>\n\n\n\n<p>Using incorrect springs or shocks kills the RTS handling advantage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Steering &amp; Brakes (Major HZ Upgrade)<\/h2>\n\n\n\n<p>HZ Holdens received significantly improved brakes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Steering<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Steering box rebuild kit<\/li>\n\n\n\n<li>Tie rod ends<\/li>\n\n\n\n<li>Idler arm<\/li>\n\n\n\n<li>Rag joint<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Brakes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Larger front disc brakes<\/li>\n\n\n\n<li>Rear drum rebuild kits<\/li>\n\n\n\n<li>Master cylinder<\/li>\n\n\n\n<li>Brake booster<\/li>\n\n\n\n<li>Brake hoses<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Bodywork, Rust &amp; Exterior Trim<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Common HZ Rust Areas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Front chassis rails<\/li>\n\n\n\n<li>Floor pans<\/li>\n\n\n\n<li>Inner &amp; outer sills<\/li>\n\n\n\n<li>Rear quarters<\/li>\n\n\n\n<li>Boot floor<\/li>\n\n\n\n<li>Plenum chamber<\/li>\n\n\n\n<li>Windscreen &amp; rear window channels<\/li>\n\n\n\n<li>Lower front guards<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Exterior Parts Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HZ grille<\/li>\n\n\n\n<li>Headlight surrounds<\/li>\n\n\n\n<li>Tail light lenses<\/li>\n\n\n\n<li>Bumpers<\/li>\n\n\n\n<li>Side mouldings<\/li>\n\n\n\n<li>HZ badges<\/li>\n\n\n\n<li>Door handles<\/li>\n\n\n\n<li>Full rubber seal kit<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Interior Restoration (HZ-Specific Details)<\/h2>\n\n\n\n<p>HZ interiors feature updated trim patterns and improved safety features.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Interior Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seat frames &amp; foam<\/li>\n\n\n\n<li>Correct HZ seat trims<\/li>\n\n\n\n<li>Door cards<\/li>\n\n\n\n<li>Dash pad<\/li>\n\n\n\n<li>Centre console<\/li>\n\n\n\n<li>Instrument cluster restoration<\/li>\n\n\n\n<li>Headlining<\/li>\n\n\n\n<li>Carpet kits<\/li>\n\n\n\n<li>Steering wheel<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Electrical System<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Electrical Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wiring loom<\/li>\n\n\n\n<li>Headlights &amp; indicators<\/li>\n\n\n\n<li>Tail lights<\/li>\n\n\n\n<li>Alternator<\/li>\n\n\n\n<li>Starter motor<\/li>\n\n\n\n<li>Voltage regulator<\/li>\n\n\n\n<li>Fuse box<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Wheels, Tyres &amp; Finishing Touches<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Wheels<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Steel wheels<\/li>\n\n\n\n<li>GTS wheels<\/li>\n\n\n\n<li>Period-correct alloys<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Finishing Items<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine bay decals<\/li>\n\n\n\n<li>Correct fasteners<\/li>\n\n\n\n<li>Under-bonnet detailing kits<\/li>\n\n\n\n<li>Period accessories<\/li>\n<\/ul>\n\n\n\n<p><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/\">H Series Home<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/hz-holden\/\">HZ Holden<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/amzn.to\/4cqplxi\">HQ HJ HX HZ Repair Manual<\/a><\/p>\n\n\n<p><script type=\"application\/ld+json\"><br \/>\n{<br \/>\n  \"@context\": \"https:\/\/schema.org\",<br \/>\n  \"@type\": \"FAQPage\",<br \/>\n  \"mainEntity\": [<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"What engines were available in the HZ Holden?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"HZ Holdens were available with 173 and 202 six-cylinder engines, as well as 253 and 308 V8s, all configured to meet Australian emissions standards.\"<br \/>\n      }<br \/>\n    },<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"What is Radial Tuned Suspension on the HZ Holden?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"Radial Tuned Suspension (RTS) was introduced on the HZ Holden and included revised springs, shocks, and suspension geometry designed to work with radial tyres.\"<br \/>\n      }<br \/>\n    },<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"Where do HZ Holdens commonly rust?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"Common rust areas include chassis rails, floor pans, sills, rear quarters, boot floors, plenum chambers, and window surrounds.\"<br \/>\n      }<br \/>\n    },<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"How much does it cost to restore an HZ Holden?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"A full HZ Holden restoration typically costs between $30,000 and $100,000 depending on model, condition, and originality.\"<br \/>\n      }<br \/>\n    },<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"Are HZ Holden parts interchangeable with earlier H-series models?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"Many body and drivetrain parts interchange, but suspension, brakes, and some trim components are HZ-specific due to RTS upgrades.\"<br \/>\n      }<br \/>\n    }<br \/>\n  ]<br \/>\n}<br \/>\n<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>H Series Home HZ Holden HQ HJ HX HZ Repair Manual The HZ Holden (1977\u20131980) is one of the most misunderstood but best-driving classic Holdens ever built. From a restoration point of view it has major mechanical differences to earlier H-series cars, especially with the introduction of Radial Tuned Suspension (RTS). The HZ Holden represents [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":41,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"class_list":["post-2023","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Complete HZ Holden Restoration Parts Checklist - Australian Holden<\/title>\n<meta name=\"description\" content=\"The HZ Holden represents the final and most refined evolution of the classic H-series platform.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/hz-holden\/complete-hz-holden-restoration-parts-checklist\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Complete HZ Holden Restoration Parts Checklist - 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