What mods will shorten engine life?

Hi everyone..
I'm thinking of upgrading some parts for my 1994 3rd gen N/A sw20..
I know upgrading suspension shouldn't put too much strain although i'm wondering if I got new cams and pistons if that would put strain on the engine?

i see.. What about the cams? Would getting new ones prolong or shorten?

Anything that adds power is going to put more strain on the motor.

regular servicing is whats best for longevity, and not over revving it, or driving it hard when its not up to operating temp. Etc.

Pretty much everything you modify will have a detrimental effect on reliability. Toyota knew what they were doing.
But if you upgrade things properly and don't shortcut, you're not gonna have a major affect. For an NA engine, if you don't touch the compression, keep the rev limit as is, don't screw up the fuelling, and keep it properly maintained, it should last as long as stock.

honestly sell it and get a turbo...easiest and best option. Been there and thats what I had to do albeit in the soarer chassis

Yep, or do a transplant.

I would do the simple stuff like advance timing and run 98 octane (you can just do this with the dizzy ) which will make a small improvement but as others have said you don't get much bang for your buck modifying the NA.

Go for a drive in a turbo and see how you like it.

Cheers

In terms of longevity, the turbo motor is obviously under more stress.  But if you dont go crazy boosting it all up, keeping it relatively normal and treat it properly (fully synthetic oil, warm up, cool down, ear out for detonation etc) then reliability is great, that was my experience with my first MR2, and I did a fair whack of motor sport in it.  It was one of the most reliable cars I have had.  I did change oil and filter every 5000km in it.
 
Cheers

Lol
I wouldn't bother
Do basic mods then learn to drive the car to its limit once you achieve that then go for more power.

Also spend your money in handeljng I'd rather spend 2000$ in suspension sway bars bushes strut braces and tyres and be 20-30kms quicker around corners and on a track then spend 5-10k to have 40-80 extra kws

Just for reference
I was going to do cams 264 duration little more lift
500$
Then new belt 200-300$
Then someone to strip it and install it
600-800$
Then you will probably want to get full benefit
Port and polish the head while its off, do valves and seals, rebuild entire head... Nek minute cya later 2-3k add another 1000 for a good port and polish job
Then you still need to have it tuned properly to see any massive results so there's several hours on the dyno. My partners uncle owns a shop and not even I get free tunes.

So there's a head built and tuned for 5k

Then bottom end you would be silly if you stripped it for another 800$ to remove engine
Then just did pistons
You would while its stripped and out
Do new apr studs
Eagle rods
Forged pistons
Have the bottom end blueprinted and balanced
Even have it bored to 2.2l

For pistons alone you will see barely any result maybe 10kw
Then your changing the compression so new head gasket blah blah

Then with all that power your clutch will need to be done there's 1000$ right there
Then if not already install an LSD

So for a decent built engine and not cut corners and just do 'cams and pistons'
It will probably cost more than what you paid for the car up to 15000$
And you would probably still be beaten by a lightly modded turbo.

Then later if you decide to turbo it
Why bother when you have just spent 15k on building a hi comp engine.

Do what tree did and put a beams in it but go a redtop so much cheaper.

Just do suspension
Intake
Exhaust
Basics.

My 2 cents