S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

stock 2.8 heads or 2.7 heads

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Old 12-27-2022, 08:30 AM
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Default stock 2.8 heads or 2.7 heads

I am currently building an apb for a "stage 3" setup in my c5 Allroad. I've swapped most of the drivetrain from a b5 so thought I'd come here rather than the C5 forums. I need some help, should I just spend the extra money and do the 2.8 head swap or just keep the 2.7 head till I am ready to build the block?

Last edited by jkangas27; 12-27-2022 at 08:31 AM. Reason: error
Old 12-27-2022, 11:28 AM
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Need much more info. Depends what build goals your trying to achieve. Stock 4 bolt mains apb block is good up to ~500hp. Are you building for more than 500hp? If so then what are your plans for turbo’s including boost pressure and block build etc?
Old 12-27-2022, 11:48 AM
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current build list ko4, rs4 inlets, rs4 clutch, cold air intake, 710dv, 1000cc injectors, 450 fuel pump, rs4 intercoolers, custom catless exhaust, and an intake spacer running on e85. I plan on doing a fully built block with a 3.0 stoker kit in the future with either a single turbo or rs6 turbos. As of right now, I'm looking for a fun street car that can run with all the hellcats in my area.
Old 12-28-2022, 10:14 AM
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Disagree with running catless exhaust on a street car as there is absolutely no reason to do it.

Post pics and enjoy your build 👍
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