{"product_id":"tomei-4ag-main-stud-crank-cap-ladder-kits-ae86-aw11","title":"TOMEI Main Stud \u0026 Crank Cap Ladder Kits | 4A-GE \/ 4A-GZE (1983-87 Corolla \/ 1984-89 MR2)","description":"\u003ch2\u003eTOMEI 4AG Main Stud \u0026amp; Crank Cap Ladder Kits\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFor 1983–1987 Toyota Corolla AE86 and 1984–1989 Toyota MR2 AW11 (MK1) 4A-GE \/ 4A-GZE 16V engine builds\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eTOMEI 4AG main studs and crank-cap ladders reinforce the lower end of Toyota 4A-GE and 4A-GZE 16V engines used in AE86 Corolla and MK1 AW11 MR2 applications. The main studs improve main-cap clamping consistency, while the ladder pieces increase support across the crank-cap area for high-RPM and performance engine builds.\u003c\/p\u003e\n\u003cp\u003eChoose the five-piece ladder set, the main-stud set, or the complete matched package with both systems.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for Toyota \u003cstrong\u003e4A-GE \/ 4A-GZE 16V\u003c\/strong\u003e bottom-end reinforcement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8740 chromoly\u003c\/strong\u003e main-stud construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM10 × P1.25\u003c\/strong\u003e main-stud thread specification\u003c\/li\u003e\n\u003cli\u003eTen main studs, ten nuts, and ten washers in main-stud-equipped configurations\u003c\/li\u003e\n\u003cli\u003eFive special heat-treated crank-cap ladders in ladder-equipped configurations\u003c\/li\u003e\n\u003cli\u003eSupports more consistent main-cap clamping and increased crank-cap rigidity\u003c\/li\u003e\n\u003cli\u003eAvailable as ladder-only, main-stud-only, or complete matched configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eBottom-End Reinforcement\u003c\/h2\u003e\n\u003cp\u003eHigh engine speed and increased cylinder load place additional stress on the crankshaft, main bearings, main caps, and fasteners. The stud-style fastener system provides a more consistent clamping arrangement at the main caps, while the ladder system adds structural support across the crank-cap area to help control deflection under demanding engine operation.\u003c\/p\u003e\n\u003cp\u003eThe complete configuration combines both upgrades for builds where main-cap clamping and crank-cap rigidity are being addressed together.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eToyota Corolla AE86\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1983–1987 Trueno (JDM)\u003c\/strong\u003e — 4A-GE 16V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1983–1987 Levin (JDM)\u003c\/strong\u003e — 4A-GE 16V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1985–1987 GT-S (U.S.-Market)\u003c\/strong\u003e — 4A-GE 16V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1984–1987 SR5 (U.S.-Market)\u003c\/strong\u003e — 4A-GE \/ 4A-GZE 16V engine swap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eToyota MR2 (AW11 \/ MK1)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1984–1989 JDM\u003c\/strong\u003e — 4A-GE 16V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1985–1989 U.S.-Market\u003c\/strong\u003e — 4A-GE 16V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1986–1989 JDM Supercharged\u003c\/strong\u003e — 4A-GZE 16V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1988–1989 U.S.-Market Supercharged\u003c\/strong\u003e — 4A-GZE 16V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFitment Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFitment is determined by the installed \u003cstrong\u003e4A-GE \/ 4A-GZE 16V engine configuration\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThe factory AE86 SR5 \u003cstrong\u003e4A-C\u003c\/strong\u003e engine is excluded; SR5 fitment requires a properly configured 4A-GE or 4A-GZE 16V engine swap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank-cap ladders cannot be used with the factory main-cap bolts.\u003c\/strong\u003e Use the TOMEI main studs or another properly sized fastener setup that provides adequate engagement.\u003c\/li\u003e\n\u003cli\u003eMain-bearing clearance and crankshaft rotation must be verified during final assembly after the reinforced fasteners are torqued.\u003c\/li\u003e\n\u003cli\u003eWith ladder-equipped configurations, verify No. 5 ladder, oil-pan, and baffle clearance; modification may be required if interference is present.\u003c\/li\u003e\n\u003cli\u003eClean and inspect the engine-block threads and follow the supplied tightening, lubricant, and thread-treatment procedures.\u003c\/li\u003e\n\u003cli\u003eProfessional engine assembly is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e TOMEI\u003cbr\u003e\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Bottom-End Reinforcement\u003cbr\u003e\u003cstrong\u003eEngine Family:\u003c\/strong\u003e Toyota 4AG 16V\u003cbr\u003e\u003cstrong\u003eMain Stud Material:\u003c\/strong\u003e 8740 Chromoly\u003cbr\u003e\u003cstrong\u003eMain Stud Thread:\u003c\/strong\u003e M10 × P1.25\u003cbr\u003e\u003cstrong\u003eMain Stud Quantity:\u003c\/strong\u003e 10\u003cbr\u003e\u003cstrong\u003eCrank Cap Ladder Quantity:\u003c\/strong\u003e 5\u003cbr\u003e\u003cstrong\u003eLadder Construction:\u003c\/strong\u003e Special Heat-Treated FC Material\u003cbr\u003e\u003cstrong\u003ePrimary Purpose:\u003c\/strong\u003e Main-Cap Clamping \u0026amp; Crank-Cap Reinforcement\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhich Configuration Should You Choose?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCrank Cap Ladder Set – 5 Ladders\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eChoose this option if the engine already has a compatible main-stud setup and only needs the TOMEI crank-cap reinforcement. \u003cstrong\u003eThe factory main-cap bolts cannot be used with the ladders.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Stud Set\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eChoose this option if upgraded 8740 chromoly main studs are needed but additional crank-cap ladder reinforcement is not. This configuration focuses on improved main-cap clamping without adding the ladder system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComplete Main Stud + Crank Cap Ladder Set\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eChoose the complete package for a bottom-end build that needs both upgrades together. It includes the matching TOMEI main studs and all five crank-cap ladders, providing the complete TOMEI bottom-end reinforcement configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStarting from scratch?\u003c\/strong\u003e The complete set is the most straightforward choice when both main-cap clamping and crank-cap reinforcement are desired. If compatible main studs are already installed, the ladder-only configuration may be the more appropriate option.\u003c\/p\u003e\u003chr\u003e\n\u003ch2\u003eAlternative Main Stud Option\u003c\/h2\u003e\n\u003cp\u003eFor builders who only need upgraded main fasteners and do not need the TOMEI ladder system, the \u003ca href=\"https:\/\/preserverad.com\/products\/arp-4age-main-stud-kit-ae86-aw11\"\u003e\u003cstrong\u003eARP 8740 Chromoly 4A-GE Main Stud Kit\u003c\/strong\u003e\u003c\/a\u003e is a main-stud-only alternative for compatible 4A-GE 16V builds. Choose the TOMEI complete configuration when both the main studs and crank-cap ladder reinforcement are desired.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAvailable Configurations\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCrank Cap Ladder Set – 5 Ladders\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(5) TOMEI crank-cap ladders\u003c\/li\u003e\n\u003cli\u003eMain studs are not included\u003c\/li\u003e\n\u003cli\u003eRequires TOMEI main studs or another properly sized fastener setup; factory main-cap bolts cannot be used\u003c\/li\u003e\n\u003cli\u003ePackage: 15 × 14 × 6 cm; 0.8 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMain Stud Set\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(10) 8740 chromoly main studs\u003c\/li\u003e\n\u003cli\u003e(10) nuts\u003c\/li\u003e\n\u003cli\u003e(10) washers\u003c\/li\u003e\n\u003cli\u003eM10 × P1.25 stud thread\u003c\/li\u003e\n\u003cli\u003ePackage: 15 × 14 × 6 cm; 1.55 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eComplete Main Stud + Crank Cap Ladder Set\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(5) crank-cap ladders\u003c\/li\u003e\n\u003cli\u003e(10) main studs\u003c\/li\u003e\n\u003cli\u003e(10) nuts\u003c\/li\u003e\n\u003cli\u003e(10) washers\u003c\/li\u003e\n\u003cli\u003eComplete matched bottom-end reinforcement package\u003c\/li\u003e\n\u003cli\u003ePackage: 17 × 29 × 8 cm; 1.0 kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TOMEI","offers":[{"title":"Crank Cap Ladder Set – 5 Ladders","offer_id":53605724815669,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true},{"title":"Main Stud Set","offer_id":53605724848437,"sku":null,"price":270.0,"currency_code":"USD","in_stock":true},{"title":"Complete Main Stud + Crank Cap Ladder Set","offer_id":53596597125429,"sku":null,"price":520.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/6005\/8421\/files\/tomei-main-stud-and-crank-cap-ladder-kits-4a-ge-4a-gze-1983-87-corolla-1984-89-mr2-02_20cf4627-7c94-4278-bb85-3f173d5eaa88.png?v=1790709501","url":"https:\/\/preserverad.com\/products\/tomei-4ag-main-stud-crank-cap-ladder-kits-ae86-aw11","provider":"Preserve Rad","version":"1.0","type":"link"}