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Author Topic: 361  (Read 2490 times)

Jason Goldsack

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« Reply #30 on: January 24, 2011, 08:42:31 AM »


Time to get the old 516's off the bench.. LOL

Anyone know what the stock compression ratio was for the '65 361? I think it was around 9:1

1965Windsor3612011-01-24 13:42:47
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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

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« Reply #31 on: January 24, 2011, 09:31:33 AM »

That's about right. Remember, high compression is essentially more power. Why do you think superchargers and turbochargers are so great? Why are NASCAR 355 cubic inch engines making over 800hp? It isn't because of all the cool steel braded lines and such, it is because they are starting out with 14-15.5:1 compression to work with.
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Jason Goldsack

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« Reply #32 on: January 24, 2011, 10:09:30 AM »

So you don't think I need the bigger exhaust valve in the 516 heads since it is only 361 cubes.

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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

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« Reply #33 on: January 24, 2011, 10:19:46 AM »

No, GM used a 1.60 exhaust valve in a 400 without a problem, and I never had a problem with them until you get up to the 440 engine, which did have slight overheating problems with the small exhaust valve, not a 361. You have the advantage of having the larger 2.08 intake already, so there is the advantage you need over a 350/400 small block engine with an extra 11 cubes. Go with the edging and you will be good, you can use several tool to do it, I prefer the carbide burr cutter in a die grinder or drill to do the chamber. I sent Polaraco (Steve) some hand drawing pictures he will post (they were too large for me to insert directly), they will give an idea of what needs to be done in freehand. Even with stock ports these modifications will have a noticeable improvement over stock chambers.
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Jason Goldsack

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« Reply #34 on: January 24, 2011, 10:24:09 AM »

How much can I mill the heads before I get into problems with intake alignment?

For sure I will port match the intake runner to the intake port on the heads.. that should be easy to do.

I'm also going to use my 1 inch spacer this year as this engine seems to long the long runner length down low. I had it on before but removed it so i could run the stock breather. Now that I have seen Steves set-up I might go that way and be able to run the spacer again.



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Jason

(Eileen)1965 Chrysler Windsor, 361/727/2.76 16.49 @ 86 mph

Steve

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« Reply #35 on: January 24, 2011, 11:07:54 AM »

If I recall, .025.  But I would never go over .015
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Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

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« Reply #36 on: January 24, 2011, 12:08:11 PM »

915s are fine without shaving, mine had 225K miles on them, thought I would clean them up and they were only .002 off so they cleaned up easily, and they had overheated many times without damage (wrong radiator cap didn't seal the radiator. ooooops).
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Snotty

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« Reply #37 on: January 25, 2011, 09:44:10 AM »

[/QUOTE]


 
I have a 400 in my back yard.  It was what I traded for the Gremlin, but the guy never picked it up.   In another year the statute of limitations on bhis ownership will run out. 
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It's green here in Chico!!
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