Llessur Posted July 8, 2021 Share Posted July 8, 2021 I've got a feeling I've asked this question before but I can't seem to find the thread now so I'll ask it again... I'm (still) in the process of rebuilding the engine from my 2500S and things are finally starting to take shape. My camshaft showed some light pitting to a couple of the lobes so I've sent it off to a reputable place in Victoria (Clive Cams) for inspection and hopefully a re-grind. The cam is a stock 307621 and the head is part number 219021 which is identical (except for the EGR port being drilled for the Australian market - not that I've got one fitted) to the 219016 head. The block is number MM44232HEA. Pistons are +20 thou, bearing shells are all +10 thou. Everything else about the engine and head is standard. Both have had a very light skim to their mating surfaces, the recesses for the head gasket rings on the block are still well within spec. I'll be running rebuilt twin HS6s. Providing my camshaft is assessed as good for a regrind, should I stick with the 307621 profile would it be worth getting it re-profiled to 308778 specs? Am I more likely to breach the hardening if I go with a new profile as opposed to keeping original? I can get a 308778 ground from a new billet but this is around 4x the price of a re-grind. All thoughts welcome 👍 Quote Link to comment Share on other sites More sharing options...
Guppy916 Posted August 9, 2021 Share Posted August 9, 2021 I have a 2.5 in my GT6 which I run a Newwman cam TR16/280/405 Just a thought if you change cam, it has a little bit more get up and go, along with being very drivable 1 Quote Link to comment Share on other sites More sharing options...
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