wow thanks alot guys for all your input.he would upgrade the valvetrain but ive heard alot of people saying that theve made massive amounts of power with the stock springs and retainers in my book it is better to upgrade them for sure but with a kinda tight budget he cant really afford wayward spending(i know that it is a very smart thing to upgrade them but if there werent so much people making 500+hp with "stock" head and valvetrain i wouldnt have second guessed it).the car that is being built will be a street car/weekend warrior i dont think over 8k rpms would be needed...as much..... i hope not and it is not my car it is a friend's car.
Are upgraded valves and springs necessary?
- Thread starter hks_trinidad
- Start date
There are degrees of "stock" head ie: stock built with all new genuine parts and at the other end stock 100,000 mile old with saggy assed springs. 
CS: BBC Comp cams springs but they're only singles.
See my pic on the previous page if I'd been running singles my motor would be scrap metal now
Redundancy is a good thing.
See my pic on the previous page if I'd been running singles my motor would be scrap metal now
Redundancy is a good thing.
Good info.. Sounds like stock springs might be best for me right now.
So I guess you are(IJ) saying that single aftermarket springs might be unreliable at continued high RPM? I wonder if stock springs will hold up better than (single)aftermarket springs-that is at a lower RPM.
So I guess you are(IJ) saying that single aftermarket springs might be unreliable at continued high RPM? I wonder if stock springs will hold up better than (single)aftermarket springs-that is at a lower RPM.
Mr: At sustained high rpm springs can run hot enough to glow so the very best metallurgy is required as well as extreme care in assembly as the slightest mark on a spring will become a failure point.
I had my Ferrea's Cryo treated for this build, I really wouldn't risk a single spring in this motor as a breakage like I posted with duals while an inconvenience isn't terminal.
Dropping a valve @ 8000rpm you might get away with saving the intake and cam covers the rest would be scrap
I think a set of new stock springs that have been shotpeened and then Cryo'd would hold up nicely for sustained 6K work, above this you really need to spend the $$$.
I had my Ferrea's Cryo treated for this build, I really wouldn't risk a single spring in this motor as a breakage like I posted with duals while an inconvenience isn't terminal.
Dropping a valve @ 8000rpm you might get away with saving the intake and cam covers the rest would be scrap
I think a set of new stock springs that have been shotpeened and then Cryo'd would hold up nicely for sustained 6K work, above this you really need to spend the $$$.
What IJ is saying is that you would want a dual set up so that one spring would save your motor if the other failed. Given that you had a big enough cam to hit a piston. The chevy spring is a very cheap upgrade from stock. Cheaper than new toyota springs. they are the inner springs to a dual bbc set up as said above.
If you have a stock motor.. or even a motor with 1mm OS valves, you'll still have a noninterference motor. IJ is taking it to the extreme by making his motor an interference design. I think it's cool.
*at least I do with 1mm OS and ross pistons, and my buddy does who has 1.5mm OS and ross pistons. This was checked with clay on the piston tops prior to final assembly.
*at least I do with 1mm OS and ross pistons, and my buddy does who has 1.5mm OS and ross pistons. This was checked with clay on the piston tops prior to final assembly.
Al: Mine is still non interference (just)
My point is break a single and it'll soon become interference in a major way!!!
Break a dual and the inner will still hold the valve up, I drove mine 30 KM's home after it let go.
My point is break a single and it'll soon become interference in a major way!!!
Break a dual and the inner will still hold the valve up, I drove mine 30 KM's home after it let go.
get chevy springs at least. for 60 bucks you get new springs with a higher rev limit + you replace almost 20 year old springs.
just my $0.02
-shane
just my $0.02
-shane