Look here for "got some new stuff for engine R&R" it's about 8-9 pages back now.
I'm making 280whp on a mustang dyno with the old short block. I paid about $2100 for the new ej257 and gasket set.
196k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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