i need advice

shogun · Post by **shogun** » Mon Mar 27, 2006 11:22 am

hi everyone, yesterday i was faced with a dilema, as you may know i started work on a 3asu head, the thing has a slightly bigger port than the normalone but has that annoying bulge around the intake valve, what should i do? do i remove it, and take advantage of the larger port or do i get some kind of performance just polishing the thing smooth (80 grit sand paper )

shogun · Post by **shogun** » Mon Mar 27, 2006 11:23 am

pics...........

Typrus · Post by **Typrus** » Mon Mar 27, 2006 4:06 pm

Hard to tell. That you can see, it the protrusion justified by some bolt or something it might house? Is it a water-jacket extension? If all it is is a casting bump, then it'd likely be fine to remove, but if it serves more purpose, it'd be foolish.

GTSSportCoupe · Post by **GTSSportCoupe** » Mon Mar 27, 2006 5:15 pm

I haven't done it myself, but I've seen a lot of guys minimize the size of that bulge, but still keep it aerodynamic. You can take the size of it down a fair amount, and not compromise the strength of the valve guide. Take the most material off the sides though, and not as much off the front and back (ie. make it thin and aerodynamic). Do some research on the net (club4ag?) to look for pics of professional head work. The bulge around the intake valve is often what they spend a lot of time on. Good luck!

shogun · Post by **shogun** » Mon Mar 27, 2006 5:43 pm

my plans were to sharpen the part that comes from the manifold and then to remove the part that rests behind the valve, since i havo to polish the whole thing it is going to be a handfull, so i dont know if i should remove it completly

shogun · Post by **shogun** » Mon Mar 27, 2006 5:50 pm

as far as i have read, datsun and chevy heads have a swirl port design but it is made for low to mid rpm torque, if you want bottom end it is not your way to go, si ill grind the hole thing off, i meassured ( dont remember the numbers exactly) but the ports are 2 to 3 mm bigger near the valve

takza · Post by **takza** » Tue Mar 28, 2006 4:15 am

hey shogun...

check out....

http://www.fueleconomytips.com/index.ph ... &Itemid=43

http://fueleconomytips.com/index.php?op ... 7&Itemid=2

...a lot of good info and links in the forum also.

shogun · Post by **shogun** » Tue Mar 28, 2006 7:59 am

thanks a lot, i have made my mind up ill remove the whole thing, my valves are allready polished, i did that yesterday, i guess until i can get my head fully cleaned, ill start on the cam sprocket to make it adjustable, im shooting for a 100hp (idealy to the wheels) so im doing every trick in the book as far as heads go