TSC Northstar Head Stud Kit — Cadillac 4.6L V8
The Northstar’s dirty secret is an aluminum block that strips before the bolt does. Every bolt-in repair kit on the market is working around that problem. This kit eliminates it.
True Strength Customs engineered a true upsized solution — 5/8”-11 Grade 8 studs machined to spec, stepping up from the factory 11mm bore and threading into fresh aluminum with nearly 3 inches of engagement. The block threads can’t pull out because there’s nothing left to fail.
This isn’t a repair. It’s a permanent upgrade built to handle boost.
Every stud is hand-machined on a lathe in Colorado and proven on a running turbo Northstar build. The kit includes everything you need to complete the job — alignment jig, 37/64” drill bit, 5/8”-11 tap, Grade 8 flanged nuts, and high-temp thread sealant. No hardware store runs. No guesswork.
Kit includes:
20x Grade 8 custom machined head studs · 20x Grade 8 flanged nuts · 37/64” drill bit · 5/8”-11 tap · Drilling & tapping alignment jig · High-temp thread sealant · Full installation spec sheet
$849 — hand machined to order in Colorado
Block and head drilling and tapping required. Professional installation recommended
TSC Northstar Head Stud Kit — Cadillac 4.6L V8
The Northstar’s dirty secret is an aluminum block that strips before the bolt does. Every bolt-in repair kit on the market is working around that problem. This kit eliminates it.
True Strength Customs engineered a true upsized solution — 5/8”-11 Grade 8 studs machined to spec, stepping up from the factory 11mm bore and threading into fresh aluminum with nearly 3 inches of engagement. The block threads can’t pull out because there’s nothing left to fail.
This isn’t a repair. It’s a permanent upgrade built to handle boost.
Every stud is hand-machined on a lathe in Colorado and proven on a running turbo Northstar build. The kit includes everything you need to complete the job — alignment jig, 37/64” drill bit, 5/8”-11 tap, Grade 8 flanged nuts, and high-temp thread sealant. No hardware store runs. No guesswork.
Kit includes:
20x Grade 8 custom machined head studs · 20x Grade 8 flanged nuts · 37/64” drill bit · 5/8”-11 tap · Drilling & tapping alignment jig · High-temp thread sealant · Full installation spec sheet
$849 — hand machined to order in Colorado
Block and head drilling and tapping required. Professional installation recommended