manifold studs

[Ruan]

Inlet manifold should be fine with bolts, that's how the petrol ones are secured even on the boosted cars

When you're running 30+lbs of boost, you need the bolts in darned tight, the manifold also tends to "slide" back off the cylinder head as you do it up, causing it to strain the threads as the engine is slanted... I guarantee there's no XU10 running 30lbs of boost... If it was standard 14psi of boost, then they're fine!

I've done it myself where you're tightening them in and it's stiff so you end up knackering the threads.