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Old 11-20-2012, 08:27 PM   #39
ASF Machine
Former Vendor
Member#: 236349
Join Date: Jan 2010
Location: Western Colorado
1993 Impreza
OD Green


This isn't a metallurgy or manufacturing issue IMO.
It's in the tune, mostly.

That said, north of 550whp on our DD, we recommend our sleeve job with Dartons.
Our record on that:
Zero dropped sleeves with a main housing bore straighter than a homophobe.

Splitting isn't the only repercussion of big cylinder pressure, as ovalling can lead to a decently short life. Some folks swear by stock sleeve blocks; ask some of them that really track these cars north of 550whp how often they go through cases.
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