6/26/19 10:44 a.m.

Hey GRM! 

I've been lurking for years and finally decided to post/ask for opinions and or guidance. This is my 74' TR6 that my dad bought in 77. It is THE car that got me addicted to cars and it became mine about 2 years ago. One problem. As a kid in my mind this was a LEGIT performer. Now grownup and having owned some actually fast vehicles/bikes I realize this thing can't even get out of it's own way but dam does she still look good. So my goal:

I'd like to build this into the car I thought she was as a kid. Something that could compete with a 240z as best as possible. I'm keeping the engine as the sound is part of the nostalgia for me but EVERYTHING else is on the table. Short term projects:

-full top end rebuild with bigger valves, hardened seats, roller rockers, Cam, and CR bumped to 10:1

-Suspension is lowered but new shocks in front and see what new synthetic oils can get the most from the lever shocks

-Seats. The tiny vinyl suspension seats can't hold me in a straight line let alone a curve plus a low back seat makes me feel very unsafe. OMP Classic? Intatrim? Will they fit? I know the Corbeau classic does but I want a high back that looks good.

-Roll bar. I'll admit mainly to look the part but hopefully have it tied into the frame in such a way that a frame-off is still possible. 

Long term:

-diff mounts, diff (lsd or r200?), CV axle shafts, and anything else to make sure the wheels don't literally fall off.

-bottom-end: .040" pistons, billet crank? (almost 3k!!) or just treated and balance rotating mass. 

-6 mikuni carbs would be the last thing powerwise.

-Transmission. Can't really make it bulletproof so.... There's a kit that allows for a Toyota 5 speed but the kit alone is 2k.


I don't plan on selling this car as it has too much sentimental value to me so I'm not concerned with the resale value aspect. Asking these types of questions around british car guys yields more arguments than constructive opinions so thanks in advance for any and all input. I know there are other people out there with some VERY capable Triumphs but it seems to be difficult to find any info on their builds especially because I'm only 30 and the Heyday of Triumph is LONG over. 


Dual Hitachi SUs replaced the Strombergs. Full big bore exhaust.

Indy-Guy UberDork
6/26/19 10:52 a.m.

In reply to RenoTR6 :

JoeTR6 will probably chime in with some advice, in the mean time, here's his build thread

Lot's of goodies in there and very detail oriented.


Edit:  I've got the TR6's older brother in my garage, a 1965 TR4.  I'm going to ruin it with an LS swap though.

tdrrally HalfDork
6/26/19 12:54 p.m.

In reply to Indy-Guy :


RenoTR6 New Reader
6/26/19 3:10 p.m.

In reply to Indy-Guy :

Awesome! I'll be excited to follow your progress on that! How much weigh will that add to the front end? 

JoeTR6 Dork
6/26/19 8:45 p.m.
Indy-Guy said:

Edit:  I've got the TR6's older brother in my garage, a 1965 TR4.  I'm going to ruin it with an LS swap though.

Ruin?  I think that's a great idea.  Done right, you will have more power than you will ever know what to do with.  In a good way. devil

I also setup a friend's TR6 for autocross.   The build thread is here.  It doesn't go into very much detail, but the list of mods is fairly complete.  The first things to address are the hubs (particularly the rear), the diff mounts, and insuring the frame isn't rusty.  It looks like you have a good starting point, and knowing the previous owner helps.  You will most likely become acquainted with Richard Good's business Good Parts.  He makes some very nice upgraded parts for a TR6.  For instance, don't even consider rebuilding the stock rear hubs.  His are so much better for not much more money.

frenchyd UberDork
6/26/19 8:57 p.m.

In reply to RenoTR6 : If you really want to go faster etc  you need more power.  A serious big chunk of power.  

That Six is a serious handicap  but it’s part of the car.  Don’t screw it up. And especially don’t blow it up trying to make it something it’s not.  Take it out and save it.  If you throw big chunks of money at it it will still be weak and feeble compared to today’s offerings.  

Now what to replace it with?  Obviously it has to be British.  Properly British.  Preferably a inline six about the same dimensions .  One that is  preferably lighter,  stronger, a lot more reliable.  Plus it would be nice if it got decent fuel mileage while making a lot more power. 

Ok before we go further, what are your skill levels?  How often do you complete a task?  Do you work on something until it’s done or lose interest and get distracted?  PS there are no wrong answers,  it just shapes how I approach this.  

Can you turn wrench’s successfully?  Weld and fabricate?  If someone walks you through it could you?  If you mess up ( and we all do ) can you toss it away and start over?  Or salvage what you can and start over?  

Finally what do you really want ?  You mentioned a Datsun 240 Z  is that what you want but it should look like a TR6?  



RenoTR6 New Reader
6/26/19 10:30 p.m.

Joe, thanks for the build thread I'll have to carefully read it when I have some more time. 



I should have added a little more to my original post but I had to head to work. 

I spent a good deal of time contemplating an engine swap and researching what engine/tranny I would use. But every time I came home and started her up I just couldn't imagine not having that sound. I don't need to go THAT fast unless I went ahead and put a full cage in to stiffen up the noodle chasis. With that being said I recently read Kastners book and believe a lot more power can be had fairly reliably. 

To answer some of your questions though; I was a mechanic in the Navy and know my way around an engine just fine however I've only built one engine so my tech manuals will be with me every step of the way. Can't weld or fabricate and hope not to throw anything away if I mess up. Your last question is a tough one. I would LOVE a 240z however I don't want to live without my 6. 

TED_fiestaHP Reader
6/27/19 6:14 a.m.

   Have you  seen what can happen to a track car?

     I would suggest something not as special and as nice as that TR6.  Your TR6 is a  very special car.  Maybe not a great track but a very special car.

       To many other  cars that are not so special that could be safer and more fun on the track.

   With the TR6 you might consider some social road rally's.  



Mike924 Reader
6/27/19 7:06 a.m.


My thoughts on this as I track an older classic.  Make the car as good as it can be.  Drive it and enjoy it on the track.  No matter what people will be asking questions and pointing and just happy to see it out there being driven like it was meant to be.  Learn to drive it, and learn what your limits are with the TR6.  Then, when you are at it's limits, enjoy it on the road, on the back roads with other Triumphs.  But when that time comes, see if there is another car (240/260/280Z) that you can buy and go faster with.  

Remember we are the curators of these beautiful cars, but that cannot stop us from enjoying them to the fullest.  Yours looks like a great solid car to start with.  


frenchyd UberDork
6/27/19 10:45 a.m.

In reply to RenoTR6 :

I’ve built too many engines to count and yet my shop manuals are always open and with me.  

One point I’d like to make.  The sound from an exhaust is unique to that engine, exhaust system.  Change the engine a little bit and the sound changes too, change the exhaust system and the sound changes.  

I’m not challenging your choice of engine, if you want to modify that Triumph six. Good for you. Although if there is as much sentiment to that car I’d build a separate engine. Still a TR6  if that’s what you want but I’d wrap up that one for the time in your life when racing is no longer possible or desired.  

As far as building as much power as Kastner’s book, I’m sure every TR6 owner feels the same way.  However look at when that was written and imagine what has changed since then.  The engines I build now are different from back then. Some things have gotten better, much better and some things worse or not even available.   

As far as welding, and fabricating. Not everyone can do it. My first attempts were a disgrace.  With help I got better. With Practice even better still.  Now I pretty well know what to do but still mess up occasionally. Then I just trash it and start over. 

RenoTR6 New Reader
6/27/19 10:53 a.m.

In reply to Mike924 :

Thanks Mike! You actually said it better than I could obviously. I'd like to build it/drive it as it was meant to be and the image I always had in my young mind. Once I find that limit I'll turn it down a few clicks and comfortably drive at that level. I know I said track car but I also put it in quotations because I want it to be track "worthy" like buying an SS, STI, Type R. Si etc. 

Anyways the top end stuff can't start until August when we move into our new place so until then I'm shopping for cams and seats. I've heard the stories of dealing with Wishbone Classics but I've also hear their cam has a great profile. Seats: I know that lowback seats were the style but I want to ditch them for something safer! OMP makes a classic but it's 22.1" wide. Inatrim has some very good looking seats but finding pictures of other Triumph seats only yields stock, miata, or full race bucket. None of which I want. Not to mention the idea of spending that much money on seats I've never sat in is a little intimidating. 

RenoTR6 New Reader
7/9/19 12:12 p.m.

Well I keep going back and forth between low-back and high-back seats. I love the safety aspect of a high-back and the fact I likely would not have to pad the roll-bar however seeing a Cobra at Cars & Coffee this weekend reminded me just how good low-backs look in these old convertibles.

This is mostly a street cruiser that I want capable for the track. Any opinions are welcome. 

bearmtnmartin SuperDork
7/9/19 2:16 p.m.

I happen to have a billet crank leaning up in the corner of my officelaugh

Aside from that, they are still quick if built correctly. Look at some SCCA results. You can make a nice quick car without loosing the soul of it.

Sideways technologies used to be the place for fast Triumphs. Haven't been there for a while.

Get all Kastner books because they are great. He also has a Q and A forum on his website that has some good info.

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