Engine Boring

[USA-PI]

Hello All,

Doing a engine rebuild, My Girl Friend is a 73 TR6 VIN# CF 5407 UG, Engine CC-30915-HE, Head FU-218227

have questions;

Head

Exhaust Valves,

what should be the actual correct size, RevingTon TR says they should be 32mm, GoodParts sells 1.255, British Parts Northwest 1.258,(will be adding hardened seats, Bronze guides w/valve stem seals), trying to get a CR of 10:1

Using a unit converter, I get 32mm=1.2598425197, I round that off to 1.260 correct?,

And are valve stem seals needed on exhaust valves?

Engine

current bore is .040, unsure of piston Manufacturer, should I rule out .060, ( it is my understanding, that with this particular block, it should not present a problem.

 

GentelMen,

As always,

Any and All,

Advise, Suggestions or Information.

Will be Greatly Appreciated.

 

BTW,

still putting in the plumbing for the PI.

 

William F.Tillman.

[Motorsport Mickey]

If the current bores are still good ( if you want a performance mod they can go out to plus 5 thou over Pistons (Pistons aren't round) why not hone them and use it with re ringed Pistons to maintain life in the engine ?

 

Mick Richards

[Waldi]

If the current bores are still good ( if you want a performance mod they can go out to plus 5 thou over Pistons (Pistons aren't round) why not hone them and use it with re ringed Pistons to maintain life in the engine ?

 

Mick Richards

That is what I did.

 

Valve guides and seals I bought from Goodparts, good quality, clear fitting instruction, and includes the bush to press the guides in at the correct depth.

Goodparts is in USA, so his parts are a lot cheaper for you.

Same for new push rods, which you will need when you skim the head.

Waldi

Edited June 10, 2018 by Waldi