I want to make around 650whp on my g35 are sleeves necessary are a high risk. I could make more horsepower In The future but not know. Thanks for the comments
Former G35driver Vendor
If you are planning to push more than 700-750 then sleeves are good, but up to there people get by with the HR or other quality head gaskets with good head bolts with seemingly no problems.
Registered User
It was a popular idea in the early days of the VQ but has seen lots of failures due mostly due to improper installation.I know of several people making over 700rwhp without sleves...do a little research over at my350z.com our sister site.