Bore or Hone 300 6 cyl.?

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golfmiser
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Re: Bore or Hone 300 6 cyl.?

Post #51 by golfmiser » Tue Jan 10, 2017 9:58 pm

No wonder they looked different. By the way that polish job on the head there looks good.



golfmiser
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Re: Bore or Hone 300 6 cyl.?

Post #52 by golfmiser » Tue Mar 14, 2017 2:11 pm

I thought I would post some pictures of the head I've been working on. Between work and the grandkids sports I've not had a chance to work on it very much. You can see by the scribe marks how big the exhaust and intake ports are on the gasket. The header inside diameter is way smaller than that gasket. I hope I can do some grinding on the header and open it up some. I just started on the exhaust/intake side. I will clean them up and smooth them a bit more before finished.
I appreciate your comments on the work done so far. I'm thinking I may need to open it up a little more below the valve seat, Just not sure how deep the new valves will sit.
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pmuller9
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Re: Bore or Hone 300 6 cyl.?

Post #53 by pmuller9 » Tue Mar 14, 2017 2:45 pm

Looks great!
Don't open the ports up to the gasket dimensions.
The intake manifold runner can be the same as the head intake port or the head port can be a little larger than the manifold so that there is a lip to act as an anti-reversion edge.
The exhaust port can be smaller than the header opening for the same reason but in the opposite direction.

Do not open the throat area up below the seat too much. There needs to be some room for a 60* angle just below the seat to help direct airflow at low valve lifts.
Just do a good job of blending the angle into the bowl area.

Just remember that the port walls are thin.



turbo2256b
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Re: Bore or Hone 300 6 cyl.?

Post #54 by turbo2256b » Tue Mar 14, 2017 4:29 pm

Havent read all tis thread but if your going to bore and or hone the block install water pump and torq to speck to prevent distortion of no 1 cyl.



golfmiser
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Re: Bore or Hone 300 6 cyl.?

Post #55 by golfmiser » Mon Mar 20, 2017 11:31 am

It looks like I got a couple of exhaust ports to big already.



golfmiser
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Re: Bore or Hone 300 6 cyl.?

Post #56 by golfmiser » Tue Mar 28, 2017 1:43 pm

Trying to get back to finishing this head. Do you think I should just work the other ports to the size suggested and not worry the one already sized to the gasket?



pmuller9
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Location: Olympia, WA

Re: Bore or Hone 300 6 cyl.?

Post #57 by pmuller9 » Tue Mar 28, 2017 3:57 pm

golfmiser wrote:Trying to get back to finishing this head. Do you think I should just work the other ports to the size suggested and not worry the one already sized to the gasket?

Yes.
On the one exhaust port just open up the header pipe at the flange to match if possible.



golfmiser
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Re: Bore or Hone 300 6 cyl.?

Post #58 by golfmiser » Tue Mar 28, 2017 5:02 pm

Ok that's what I was thinking might be the best bet. I know I can modify the header some. Appreciate your help as always.



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