Valvetrain for 960 headed T6, wanting to hit 7500rpm reliably.

[244tiCanuck]

Hey,

I'm in the middle of building the T6 for my swap, using a 960 head and early (204hp) cams.
960 has 7mm valve stems, I seem to recall seeing some people recommending to use T6 valve springs and retainers because they're a beehive spring. Aren't the RNs 6mm valve stems? I threw out my T6 head a looonnng time ago, so I can't check it.
Is there a good aftermarket setup for high-ish revving on the 960 head?

 

[poulrais]

Hey,

I'm in the middle of building the T6 for my swap, using a 960 head and early (204hp) cams.
960 has 7mm valve stems, I seem to recall seeing some people recommending to use T6 valve springs and retainers because they're a beehive spring. Aren't the RNs 6mm valve stems? I threw out my T6 head a looonnng time ago, so I can't check it.
Is there a good aftermarket setup for high-ish revving on the 960 head?

I have a B6284t head on my work bench. I can measure the stems tomorrow.

 

[244tiCanuck]

I have a B6284t head on my work bench. I can measure the stems tomorrow.

From what I've been looking at in parts catalogues, they should be 7mm until they went to the 2.9 T6.
I've got a few older RN 5 cyls at the shop here that should be the same. Might just use the springs from them.

 

[Alex Buchka]

I have the same block and head setup on my car and I run these crower 2JZ springs:

Crower 68195-24: Valve Spring Set for Toyota 2JZ Engines - JEGS High Performance

Buy Crower 68195-24 at JEGS: Crower Valve Spring Set for Toyota 2JZ Engines. Guaranteed lowest price!

www.jegs.com

Here are some numbers

	Stock 960​	Crower 68195-24​
Free length [in]​	1.65​	1.66​
OD [in]​	1.031​	1.045​
ID [in]​	0.713​	0.86​
Rate [lbf/in]​	208.8​	251​

They drop right in and I haven't had any issues at all spinning to 7500. The crower catalog lists these as the spring kit of choice for "9000rpm+" on a 2J, take that information for what you will.

 

[244tiCanuck]

I have the same block and head setup on my car and I run these crower 2JZ springs:

​

They drop right in and I haven't had any issues at all spinning to 7500. The crower catalog lists these as the spring kit of choice for "9000rpm+" on a 2J, take that information for what you will.

That's great info! Thanks.

 

[culberro]

The 2J springs have more than enough rate to handle the revs. The ID being a lot larger might cause some issues as the springs will be allowed to vibrate and oscillate more than if they were located tighter to the guide and spring retainers.