3/S Head Swap

[c2xejk]

yes!

[m90daytona]

i would like a set when you are ready. but i would perhaps like one w/ longer valve stems and stronger springs...can you do that too?

[c2xejk]

All a question of money... That said, longer valve stems will start changing valvetrain geometry. Not sure what you hope to gain. If you want to use a higher lift cam, the easiest solution is probably to machine the underside of the valve spring retainer.

The valve stems can be left a little longer than stock if you are intending for that to take up some of the slack for regrind cam...

As for stronger springs, my machinist tells me there are some aftermarket Chevy springs that are just a few thousands larger than what we have stock. If so, that should give us a large selection of springs...

All the heads I am doing are semi-custom. ie. I can taylor them to your specific application. (ie manual trans/auto/auto with a high stall torque converter, Cam choice, etc...)

The +1 intake/+4 exhaust I mentioned before is intended specifically for turbo/super applications. Stock, the exhaust flow desperately needs some help. Even more so with forced induction. Thus I am moving the E/I ratio closer to .9.

For normally aspirated, I would recommend keeping the E/I valve ratio closer to .8. Though, larger exhaust valves should help clean up/improve the exhaust port siginificanty.

The welding was done reduce the exhaust port exit which is way too big stock. It also fills in the floor were there is little activity... There is so little flow there that grinding off the nubs in the exhaust manifold (on the floor of the manifold) made no improvement in flow...

Filling the port floor improves flow. Just tough to get a welding torch in there...

[Ondonti]

The springs sound interesting........but Im assuming that stronger springs will just contribute to our lifters collapsing at a lower RPM or on a smaller cam.

Lighter retainers would probably be a better choice....The aftermarket valves will probably be lighter as well. Mine were about 10 grams lighter I think

[c2xejk]

Quote:

Originally Posted by Ondonti The springs sound interesting........but Im assuming that stronger springs will just contribute to our lifters collapsing at a lower RPM or on a smaller cam.

So are you still using a second inner spring???

[Ondonti]

Quote:

Originally Posted by c2xejk So are you still using a second inner spring???

No my machinist didnt locate any at the time he was looking.

Just new OEM springs.

[m90daytona]

well i am in no hurry, but i def want a set. as soon as you get it where you want let me know.

[dodgeshadowchik]

i know i am a latecommer into this thread, but... i have dynoed my stock 3.0L 12V.

127HP
192 ft-lb Tq. <-- don't know why this was so high.. but i'll take it.

oh and a few pages back, i noticed that something about seeing if the 24V heads will fit on a 12V block. i am picking up a 24V SOHC engine this weekend and i have a spare 12V laying around. heck, i even have a vr-4 block. (and yes, there are noticable differences between that block and the sohc 12v's that would pose problems) i think i shall try to fit those 24V SOHC heads onto the 12V block to see. if they work, that'll save me some time with the motor mount issues of swapping the 24V into my shadow. heh! hmm.. i think i have a slight obcession with mitsu 3.0's!

[Ondonti]

Im guessing you have an auto tranny.......4speed.

[dodgeshadowchik]

it did.



'tis 5-speed now.

[Ondonti]

Would be fun to see a dyno with just the 5 speed being different.

[m90daytona]

i dont know if i trust those numbers...if the torque number is way off, whos to say the hp number is accurate.

[Ondonti]

Quote:

Originally Posted by m90daytona i dont know if i trust those numbers...if the torque number is way off, whos to say the hp number is accurate.

The torque number is not off.

Its called an auto tranny.
Why do you think I was able to guess what transmission she had??????

[m90daytona]

Quote:

Originally Posted by Ondonti The torque number is not off. Its called an auto tranny. Why do you think I was able to guess what transmission she had??????

what makes the auto trans put down so much more torque? our motors arent that much torque at the flywheel are they? did she have the 5spd or auto in when she did the dyno?

[jory]

automatics multiply the torque due to the torque converter.. that's one reason auto's are better for towing.