rjb2968 Posted February 1, 2019 Report Share Posted February 1, 2019 Hello all, for those who have done an overbore to 77mm+ to create a 2.7, what pistons did you use? please be very specific I.e year make model. I know the mazda e pistons were the go to but they are impossible to find.... Quote Link to post Share on other sites
Dave McDonald Posted February 1, 2019 Report Share Posted February 1, 2019 Hello person with no name and welcome to the TR Register forum, 78mm pistons by JE, giving 2725 cc are available at Cambridge Motorsport www.cambridgemotorsport.com Tele 01462 684300 You will need a special oversize head gasket. These are available from a well known TR Specialist in Lincolnshire but much cheaper at Wishbone Classics in the USA, even including the shipping and import taxes. wishboneclassics.com Dave McD Quote Link to post Share on other sites
TriumphV8 Posted February 1, 2019 Report Share Posted February 1, 2019 I have a set MAZDA pistons in 77.75 and a set in 78 complete with rings to sell. It is the piston I already fitted to one of my engines. Gasket can be obtained at Elmeso-Reban in Germany who do a gasket for 78mm. It is about 120 to 140 Euros. It is necessary to have a block with no recess. If the block has a recess it must be milled off and pistons must be cut to fit. That is possible with no problems. It is about 0.7 to 0.8mm. Do not underestimate the work on the pistons. Pins are press fit and the piston must be modified to accept floating pin by shortening the pin and making grooves for the circlips. Quote Link to post Share on other sites
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