hey im building a high output 7m motor the head of the engine is going to be port and polished and i am getting cams. should the vale springs,valves and retainers be upgraded also? the rough expected output of the car is about 500-600hp .thanks
Are upgraded valves and springs necessary?
- Thread starter hks_trinidad
- Start date
I think your teetering on the edge there. It be a good idea but possible not necessary depending upon your camshafts. I think this thread should be moved to the engine internal section. You would probably find alot more help there from the SME.
no ...... people have made massive power on the stock head http://www.7mpower.com/duane_stephens.shtml
Read this whole thread.:evil2:
http://www.supramania.com/forums/showthread.php?t=38501&highlight=chevy+block+valve+springs
http://www.supramania.com/forums/showthread.php?t=38501&highlight=chevy+block+valve+springs
While people have made massive power on the stock head, it should be pointed out that Duane's engine bumped it's torque up a huge amount when he worked over the head.
Upgraded springs are required IMO if you plan to spin the engine faster than the stock redline.
Upgraded springs are required IMO if you plan to spin the engine faster than the stock redline.
grim i agree 100% however his question was "Are upgraded valves and springs necessary?" to break 500-600hp and the simple answer is NO if his question was do you think it would be a good idea ....... hell yea!
These type of threads are funny. People building a motor for big power but ask these simple questions. Think of engine perfomance as solid internals + air + fuel + spark + how fast it enters and leaves= POWER. Do whatever your budget allows you to increase those things.
I think the head should be one of the last things to do because the gains of valves and springs, porting and polishing the head and are alot less than a good turbo, 550's or bigger, good IC, piggy back, intake and exhaust.
Spend money and time wisely ......
These type of threads are funny. People building a motor for big power but ask these simple questions. Think of engine perfomance as solid internals + air + fuel + spark + how fast it enters and leaves= POWER. Do whatever your budget allows you to increase those things.
I think the head should be one of the last things to do because the gains of valves and springs, porting and polishing the head and are alot less than a good turbo, 550's or bigger, good IC, piggy back, intake and exhaust.
Spend money and time wisely ......
Malloynx passed 600 flywheel hp with bolt on power. I think if he redoes the head, he can simply hit that point easier.
everyone is giving good answers, but remember, he said he is going to put a biggerr set of cams in the head. The the point of needing to upgrade the valvetrain really depends on the cam selected and the rpm he wants to spin the motor. An Under 8mm 264 cam run at near stock rpm will play happy with the stock valvetrain providing that the stock set up is in good shape. Spin that motor to over 8k and yes you need a spring upgrade. A cam with over 8.5mm of lift run at any rpm, I would upgrade the springs for sure. Run 9.5mm or greater cam and I would upgrade everything including the timming belt.
I'll just say it this way, since I'm only BPU and all. If you are building a "high output" engine, don't half ass it, all the extra parts will get you is more reliability and better engine backgorund, meaning all the parts you buy otherwise, like the turbocharger and intercooler and exhaust etc etc will make more power if they are feeding an engine with a well built bottom end and a head that can flow air, boost doesn't neccesarily make power, the amount of air the turbo and head can flow as well as fuel are what really make all that power and torque.
And like mentioned before power without torque is useless.
And like mentioned before power without torque is useless.
but this applies to people wanting major power on a healthy budget, it's not going to make a lot of extra power on its own but a well build engine will be much easier to make power and much more reliable. I kinda feel the weakest link is what breaks, IE Oiling system is a major problem, the head design itself is sucky compared to the JZ series. Good Luck and for 500 or 600 it isn't a requirement, so if you don't have the money availble then yes you can get away with it but when you decide thats not enough you will need the major head work etc.
Hmmm let me see 20 year old sacked out springs and hardware on a 600hp build WHAT WOULD I DO.......... :biglaugh:
I agree 100% do it right the first time, but my thoughts about this question is just based on the whole mkiii way of doing things. Not all, but the majority. If you are building a "high output" motor that has gone as far as a cam upgrade along with the port and polish why would you second guess the valves and springs???????
Thats like me saying i upgraded my injectors, MHG, IC to massive core and 4inch piping but i am running a stock ct26 but hey do you think i should upgrade my turbo??? thats just how i am interpreting this thread
Thats like me saying i upgraded my injectors, MHG, IC to massive core and 4inch piping but i am running a stock ct26 but hey do you think i should upgrade my turbo??? thats just how i am interpreting this thread
suprarich said:
dude he is not asking if its needed to complete his cams and port and polish .... he is asking if its good idea to do valves and spring while he is at.
Last edited:
Depending on the price I'd look at some new Toyota springs if you're not raising the limit.
If you plan on running it at high rpm for extended periods get the very best springs you can afford.
Ferrea duals @ 8000 rpm for sustained runs
(it sagged 3 others by 10psi)
If you plan on running it at high rpm for extended periods get the very best springs you can afford.
Ferrea duals @ 8000 rpm for sustained runs
(it sagged 3 others by 10psi)
