240ZBUILTBYME Posted July 5, 2022 Share Posted July 5, 2022 Hi all Thought I would start a thread topic on the JMC head project as from what I can tell no one has done so already. would be interested to know if anyone in Australia is planning a build with one of these. for those living under a rock JMC designed and manufactured a brand new L28 head with various improvements over the oem N42 head. - larger intake/exhaust ports with a uniform 2.5mm thickness between ports - reshaped combustion chamber designed for higher compression - redesigned water jackets to improve cooling Overall aiming for a better flowing and more durable head for tuning the L28 Website supplying the US: http://bluemoonperformance.com/project-l6/ has spec sheets and pricing chart video of the head in action Video where they CT scan a worked genuine L series head and found a port wall thickness of 1.2mm The price for a head is around the $7-8k AUD mark. So a significant investment. I haven’t seen any testing or performance/dyno figures with and without the head for example. discuss. gav240z 1 Quote Link to comment Share on other sites More sharing options...
Administrators gav240z Posted July 5, 2022 Administrators Share Posted July 5, 2022 I think what they are doing is a great idea, given that OEM cylinder heads are getting harder to source and often in poor shape by this time. I also like the idea of a head you can bolt on that will straight away flow better than anything else. I am eager to see results also, given cost of porting a head and prepping it, the $7-8k is actually not a bad deal. 240ZBUILTBYME 1 Quote Link to comment Share on other sites More sharing options...
Administrators gav240z Posted November 14, 2022 Administrators Share Posted November 14, 2022 Anyone ordered 1 yet? cracker 1 Quote Link to comment Share on other sites More sharing options...
cracker Posted November 14, 2022 Share Posted November 14, 2022 11 hours ago, gav240z said: Anyone ordered 1 yet? The first batch was sold out months ago I think - have they offered another allocation? gav240z 1 Quote Link to comment Share on other sites More sharing options...
240ZBUILTBYME Posted November 19, 2022 Author Share Posted November 19, 2022 On 11/14/2022 at 7:59 PM, gav240z said: Anyone ordered 1 yet? in terms of exchange rate to the yen there's probably no better time. Id love to get one but really want to see some solid numbers and testing come back from a western source. Quote Link to comment Share on other sites More sharing options...
C.A.R. Posted November 20, 2022 Share Posted November 20, 2022 On 11/19/2022 at 5:50 PM, 240ZBUILTBYME said: in terms of exchange rate to the yen there's probably no better time. Id love to get one but really want to see some solid numbers and testing come back from a western source. Are you intending on building an all out competition engine? Quote Link to comment Share on other sites More sharing options...
240ZBUILTBYME Posted November 21, 2022 Author Share Posted November 21, 2022 6 hours ago, C.A.R. said: Are you intending on building an all out competition engine? No, i just like shiny things…. I haven’t made any final decisions about my engine build. And you could argue it’s unnecessary to spend that amount on a street car head. Quote Link to comment Share on other sites More sharing options...
NickF Posted November 21, 2022 Share Posted November 21, 2022 Might find it better to complete body work before considering mechanicals. Many a build falters in body restoration. Quote Link to comment Share on other sites More sharing options...
240ZBUILTBYME Posted November 21, 2022 Author Share Posted November 21, 2022 19 minutes ago, NickF said: Might find it better to complete body work before considering mechanicals. Many a build falters in body restoration. I agree with you, but if the 240z is cactus I have a 280zx that the worked engine will fit in perfectly….. Quote Link to comment Share on other sites More sharing options...
hmd Posted November 21, 2022 Share Posted November 21, 2022 My vote is to stay with an L6 with carbies. Just a rebuilt L24 but nicely tune. Unless you want to do restomod with big flares etc.. then RB26 it. Quote Link to comment Share on other sites More sharing options...
240ZBUILTBYME Posted November 23, 2022 Author Share Posted November 23, 2022 On 11/22/2022 at 6:48 AM, hmd said: My vote is to stay with an L6 with carbies. Just a rebuilt L24 but nicely tune. Unless you want to do restomod with big flares etc.. then RB26 it. L6 was always the plan, I never had an original L24, only a L20, so I have a L28 head and block for the build, Ive always planned to go with carbies but lately i have been toying with the idea of doing FI wit ITBs, combined with stroking it makes a pretty potent package. Quote Link to comment Share on other sites More sharing options...
hmd Posted November 23, 2022 Share Posted November 23, 2022 ITB are greats but the cost is huge for what it gains over a professionally tuned carbs. Get webbers and go to Steve Boyle in Perth to get it tuned. He's a guru with carbs. 240ZBUILTBYME 1 Quote Link to comment Share on other sites More sharing options...
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