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Message: [QUOTE="TARM, post: 263317, member: 578"] Back pressure IMO has nothing to do with the need for or against headstuds. Even positive boost psi in and of itself doesn't IMO. Now the effects boost has on other factors certainly does but its not direct. Consider what the highest BP you have seen with a bad turbo setup or one pushed way past its range. Now consider what the static CP of a cylinder is when you test it just by cranking it over without any detonation. 400-450psi? Compared to what a super high BP woudl be like 100-150 even 200. Now consdier what the CP is when a engine on the power stroke is producing 1000-1500 ftlb tq. At the most basic level the amount of torque your engine is producing has a direct correlation with the amount of cp. That CP is being held by the studs or bolts. At a more tech level how and when the actual pressure curve is also has a significant effect IMO. I agree BP can be damaging and is something to be avoided but I do not believe it has an effect on the clamping force between head and block. IMO tuning has a lot to do with it but at some point CP will be too high for bolts to hold. If you want to play it safe from what I have seen 1000 ftlb tq would be a swag as a line. That of course is with original factory sealed heads. [/QUOTE]

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