Porting a Chy 340/360 head.

Place to post some pics of whatca all work on, race, drive etc . . . I personally enjoy seeing what the members here do as a "hobby" and am sure the other members would also be interested. Feel free to post your pics!!

Postby Flash » Sun Oct 25, 2009 2:36 pm

I read over at speedtalk about what others have to say. It seems with these early heads not able to really handle over .28 L/D ratios that everyone has a different way to do things. That's why you must bite the bullet and learn.


Chris, i must have been reading to fast and miss this!
If you could post up a link to that thread, it would be GREATLY appreciate!
Have been searching over at speed talk, even have two thread up over there, because i couldn't find ANY info on the old 340/360 aka LA heads.

Any thread you or any body else come across on speed talk please post up!
If you find any that were started by Cudafever.....a, ya, read them, as,.. I started them:-)
That's why you must bite the bullet and learn.


O ya, learning as i go for sure........just wish i was doing it on a junk head instead of trying to NOT make one out of this one, trying :)
I took my SSR out wider instead of the cant/bias or nice radius on each side ((1/2 radius) because I needed the CSA (3 sq/in) in addition to the help to even out the speeds.

I have read that a few time, "cant/bias" What is that?

On small block Chevy heads there's water in that location. I remove just enough material to blend the transition from the push rod pinch to the bowl. I don't straighten this wall. The wall to straighten is the divider wall.

Are you taking about the wall between the two port, roof bump or guide bulge?
Gordon
Flash
 
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Postby Flash » Sun Oct 25, 2009 3:02 pm

Guys when using the ZSpar SplashZone you have to make sure
that the area you are going to use it in is really clean.

I have used this stuff in the passed it does work very good.


Malvin you mix this suff 50/50?

How long does it take to harden.

Mine is kind of a minor repair, but how big of a hole have you filled with it. or have you just used it to fill dead spots?

I had taken Friday off, to give me a good 3 day weekend to get a list as long as my arm accomplished......well. that "hole" let all the air out of my sail,......... got a good nights sleep, ready to go at it again. still have so much i want to try.......wish i could take another day off.........
Gordon
Flash
 
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Postby coulterracn » Sun Oct 25, 2009 5:35 pm

The divider wall is the wall betwee ports. It's usually straightest of the two port walls. In most cases you only have to worry about the head bolt hole protrusion.

I have used JB Weld (original not quik-set) to repair heads and blocks with good results. The block I'm running now was cracked between the lifter valley and water circulation opening in the deck. I drilled through the block at the end of the crack and ground a gruve along the crack from outside to inside the block. I filled it with JB Weld and let it cure with a 100 watt bulb in a reflective shield fixture. That was in the mid 80's.

Ray
"I know I'm in my own little world, but it's ok, they know me here"
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Postby Flash » Sun Oct 25, 2009 9:37 pm

thanks Ray,

Well laying back the ssr and widening it, a lot on the prp wall.

Tried to smooth any bump i could find.

resoles?

Well, compared to my best cfm #### lost 7cfm a .100 -6@.200 Match @.300 - 2@.400 - 2@.500 and +1@.600

This is the first time that .600 cfm was higher then .500.
I have my max cfm back........but it's at .600 lift :(

compared to the low # when i messed up the seat. I had 20+ cfm more all the way too .600 lift.

My choke was enlarged do to short 75*cut. And when i roled back the ssr, it opened up the choke csa enlarger...................at least that my theory on the .600 lift starting to flow now.

Sound is better, no tire screeching sound.
fps port tells me the ssr has slowed, almost to much265-350(Compaired to the 398-444 i started out with)
but mid port and roof has increased.
the vary top of the roof wouldn't hold even 100 cfm now is a 199
Clay experimentation is the only port work i will be doing on this port from here.
Gordon
Flash
 
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Postby Malvin » Sun Oct 25, 2009 9:54 pm

Flash just follow the instructions that is what I did & when
I did it turn a olive green or close to that color worked
out for me very good.

I levee it dry for 48 hours @ 72 degrees I do not want to
take a chance.

I filled holes about 1/4" make sure you get some worked back in
around the back side of the hole to help hold it in there. Then
I pressure tested the head it held & has been on that engine
for five years now with out a leak.

Malvin :)
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Postby Flash » Thu Oct 29, 2009 1:19 am

Thanks Malvin!

Well, after reading Tom's thread,and Larry's post/link to the "Flow Balls"
I decide to make me a primitive set of flow balls.
Image
Image

I made mine out of some old ball bearings and the smallest one came form a carburetor kit. The wire, is a larger diameter, mechanic's wire. Think I'm going to make me one more that's even smaller. the smallest one, float in the are stream, in some places.

This make a much better picture of were the air is going. Much better then the FPS probe..........But then again, the the ball would slam to either wall but didn't like the center..... went, Hmmmm wonder what the fps is in that area :D

Here is another idea, for those that, want to try and build one.
remember the "Blow Dart guns" you had as a kid.
the wire would flex a lot, but not bend like mechanic's wire.
the balls would flow much better in the air stream then steel or lead...........

Any ways it was vary interesting to watch the ball move along the floor of the port like a snake!
Enter the port, it went to the, non prp wall. An inch in, it go's to center. a faction more and it slams up agenced the prp wall.
As i go farther into the port, it centers up and head straight for the fastest fps point of ssr.

Now, I have no clue, how to apply this to my port. But after i get some more play time with these, and start mapping the direction of the air, and at what height,..........I thing i will experiment some more with clay.(don't dare grind much more on this port.......It's to large any ways!)
My largest ball, made vary little difference(good or bad) threw most of the port.

My next port, i will be attacking, from a hole different direction.

Man i have so much to learn............Just to be able to call my self a "Educated IDIOT" :p :D
Gordon
Flash
 
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Postby Flash » Mon Nov 02, 2009 2:18 am

Chris could you expand on this statement a little.
I took my SSR out wider instead of the cant/bias or nice radius on each side ((1/2 radius) because I needed the CSA (3 sq/in) in addition to the help to even out the speeds.


well spent some more time with my balls Flow balls that is. :laugh:
what i found the most interesting.......Was the hole i created in the runner.

When i run the largest ball in the port, at that part going up and down......there is no air flow change. Move the ball in 1/4 of a inch and it starts to affect the flow toward the ssr.

In other words, that visual straight line i cut between the prp and the bowl area, and creating a hole in the proses, yeah bad move!
By the way my head has a core shift (shocker :p ) and is what caused the thin part to brake through. The lower half, has plenty of metal to grind.
It's go me worried about some other places in this port.
Gordon
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