TR5 valve springs measurements

[DJB350Z]

Hello,

I have a GT6 with a 2.5 PI engine from a 2500. At some point in time the PO swapped the head and I'm struggling to find out what car it came from, since the valve springs I just bought for the aforementioned engine are too small.

The stamp number is 516816, which I now think may make it a TR5.

It has inner and outer valve springs.

Before I order TR5 valve springs and try them, can somebody do me a massive favour and give me the measurements?

My old inner springs are: 43mm tall by 20mm OD (Measured with a steel rule and not verniers so could be slightly +/-).

If TR5s match that I'll give them a try.

Thanks

Edited August 18, 2022 by DJB350Z

[BlueTR3A-5EKT]

This is from some ancient notes I have for the Triumph Tune replacement set for TR5/6  TT1207

Inner  46.5 free length  18.95 O/d

Outer  42.5 free length  28.25 o/d

 

It could be all rubbish......

 

[tr graham]

The above is correct , and a 516816 is indeed a Tr5 be careful there are different length pushrods  in a 6 cyclinder depending on block and head .

Mini Cooper race springs work well 1 less winding 

graham

[DJB350Z]

Thanks. I can see the TT1207 springs listed in a Moss catalogue.

Since the measurements of my old springs are different can I safely assume that any of the following part numbers would be suitable?

[Waldi]

I would order the springs from Chris Witor, I got mine from him, including new exhaust valves; do not order “uprated” springs, unless you are a racer boy, as these will increase the risk of wearing out the followers and cam.

Waldi