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1. [6pack] Early vs Late Head (score: 1): Author: owenskenbrenda@bellsouth.net; Date: Fri, 09 Nov 2007 18:27:48 +0000; I plan to install Richard Good's triple carb setup on my 71 TR6. The head (early model) was overhauled less than 2 years ago and is working very well. I do have an extra head that is a 1974, but, it; /html/6pack/2007-11/msg00079.html (7,436 bytes)
2. Re: [6pack] Early vs Late Head (score: 1): Author: "John Macartney" <standardtriumph@btinternet.com>; Date: Sat, 10 Nov 2007 00:07:32 -0000; Ken Owen's wrote: Also, since the exhaust valves are smaller, would this not be a reason to use the early model head (without machining the later head to accept the larger valves). I do realize the v; /html/6pack/2007-11/msg00081.html (7,690 bytes)
3. RE: [6pack] Early vs Late Head (score: 1): Author: "Navarrette, Vance" <vance.navarrette@intel.com>; Date: Fri, 9 Nov 2007 16:26:38 -0800; The later head has much better profiles on the ports, and so flows much better than the earlier head. Also, despite the fact that the earlier head has a larger exhaust valve, I believe the later hea; /html/6pack/2007-11/msg00082.html (8,809 bytes)
4. Re: [6pack] Early vs Late Head (score: 1): Author: tr6taylor@webtv.net (Sally or Dick Taylor); Date: Sat, 10 Nov 2007 13:26:10 -0800; Several years ago I noted that my valves had fallen under the desired spec, so far as stem diameter. This was on what is considered to be the late (1973) head, with the better intake manifold. So I o; /html/6pack/2007-11/msg00084.html (8,402 bytes)
5. Re: [6pack] Early vs Late Head (score: 1): Author: "John VanNorman" <jsvannorman@gmail.com>; Date: Sat, 10 Nov 2007 16:26:40 -0500; Question for the group. Originally I had a problem with the engine rpms on the old man's TR6 gradually increasing as the car sat idling, but after doing a rebuild of the carbs, that problem was taken; /html/6pack/2007-11/msg00085.html (7,780 bytes)
6. Re: [6pack] Early vs Late Head (score: 1): Author: "John Macartney" <standardtriumph@btinternet.com>; Date: Sat, 10 Nov 2007 22:06:19 -0000; Hi, Dick Hum, ha, er.... Can't answer that one, though I'd be surprised an earlier model head was hanging around in Engine Assembly for that long. Of course it could happen but I'd be surprised if it; /html/6pack/2007-11/msg00088.html (8,277 bytes)
7. Re: [6pack] Early vs Late Head (score: 1): Author: tr6taylor@webtv.net (Sally or Dick Taylor); Date: Sat, 10 Nov 2007 23:09:00 -0800; John--Other than the diameter of the exhaust valves, every other indication is that of the later head. Port spacing, head thickness and the like. Guess it will just remain a mystery. Dick standardtri; /html/6pack/2007-11/msg00093.html (8,547 bytes)
8. RE: [6pack] Early vs Late Head (score: 1): Author: "Navarrette, Vance" <vance.navarrette@intel.com>; Date: Mon, 12 Nov 2007 08:13:31 -0800; Ummm. Have you had the engine overhauled before? Could the machine shop have upgraded the valve size as part of a rebuild? If you do some judicious reshaping of the combustion chamber in the vicinit; /html/6pack/2007-11/msg00098.html (8,715 bytes)
9. RE: [6pack] Early vs Late Head (score: 1): Author: "Robert Breazeale" <RobertBreazeale@msn.com>; Date: Wed, 14 Nov 2007 08:59:14 -0800; I don't mean to hijack this topic, but I've been following it with interest. I was wondering, is there any advantage in putting the later head onto an early block? Or is it even possible? I have a TR; /html/6pack/2007-11/msg00121.html (9,112 bytes)
10. RE: [6pack] Early vs Late Head (score: 1): Author: Robert Lang <lang@isis.mit.edu>; Date: Wed, 14 Nov 2007 12:10:12 -0500 (EST); The late head will bolt right up to the block. No probs there. You WILL have to change the intake manifold to the later style. I'm not sure if the carb air cleaner will clear the TR250 inner fender,; /html/6pack/2007-11/msg00122.html (8,015 bytes)
11. RE: [6pack] Early vs Late Head (score: 1): Author: "Navarrette, Vance" <vance.navarrette@intel.com>; Date: Wed, 14 Nov 2007 10:17:34 -0800; I would add that the compression on the later head is lower, so you will want to mill the later head to regain compression. And as long as you are doing that, you might as well mill it enough to bri; /html/6pack/2007-11/msg00124.html (9,518 bytes)
12. RE: [6pack] Early vs Late Head (score: 1): Author: tr6taylor@webtv.net (Sally or Dick Taylor); Date: Thu, 15 Nov 2007 23:48:51 -0800; Vance--I finally took the time to look at all records of work done, before and after I started doing my own. I have them all, even from the first oil change when the '73 was still under new car warra; /html/6pack/2007-11/msg00138.html (9,883 bytes)

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