dellyend1 Posted September 6, 2021 Report Share Posted September 6, 2021 Hi All, whilst investigating a sudden and temporary stalling of my car (GT6 mk III) at the weekend (on another section of the forum), I have been checking engine numbers etc and discovered that a previous owner has put what I think is a 2.5 Saloon Head on the block as has number 219016 & 313248 on it. It goes like a rocket now all set up properly, but wondered why someone would do this. All I know about the history is that the car was re-built by someone that wanted to do classic race / track events in it and the engine has supposedly been re-built with this in mind. I've been reading up on 2.5 heads on 2.0 L blocks and think I understand that low compression is a risk if the head is not skimmed enough. Just after any info really, what is needed to be done to the engine etc to make the 2.5 head work so as I have reference for the future. Also just checking that there is not anything i this that would contribute my engine stall at idle after a 40 min spirited drive. Many Thanks Jeremy Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 6, 2021 Report Share Posted September 6, 2021 It's entirely possible that the head has already been skimmed to fit the 2.0 litre block, maybe it was used as an exchange unleaded head or similar, or was just a case of a PO using what came to hand? Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 6, 2021 Report Share Posted September 6, 2021 chris witor gives a lot of head identifications on the download chart here https://www.chriswitor.com/technical.php Link to comment Share on other sites More sharing options...
Clive Posted September 6, 2021 Report Share Posted September 6, 2021 You can measure the depth of the head and compare to the unskimmed height. That should tell you if it has been skimmed (I think a lot needs to be removed!) Of course, if your engine is fitted with domed pistons, it would have had a 2.5 head from the factory (just not the late 2.5S version). Or another possibility is the engine has been built as a 2.5. Just crank/pistons and job done. You need to investigate further.... Link to comment Share on other sites More sharing options...
Dick Twitchen Posted September 7, 2021 Report Share Posted September 7, 2021 12 hours ago, dellyend1 said: It goes like a rocket now all set up properly I would suggest use it and enjoy it; if something goes wrong and the head has to come off all will be revealed (maybe)! Dick Link to comment Share on other sites More sharing options...
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