Re: best way to mark ports on heads ot intakes to port?
[Re: 340SIX]
#2528533
07/29/18 08:08 AM
07/29/18 08:08 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Is there a question there?
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: best way to mark ports on heads ot intakes to port?
[Re: 340SIX]
#2528712
07/29/18 06:27 PM
07/29/18 06:27 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I make a horizontle swath of Dyken across the top & bottom of the intake & head ports then scribe a horizontle line across the top & bottom of the ports in the dye (+slight porting ahead of time to get the top/bottoms of the ports even, as needed) then at each "end" of the scribed lines a 90 deg turndown in a bit more dykem. so you have an "L" at the end of each horizontle scribed line (I hope that descrip makes sense). Do the same on the intake then I set the intake down on the side gaskets (SB) & at each end of the eng tilt the manifold a bit up/down (side to side) till the lines between the heads & the intake have the same gap on each of the 4 corners. EDIT (SB) May need thicker/thinner side gaskets or even 2 pairs and or elongating the intake mounting holes or intake milling. Mockup dry & go from there.
Last edited by RapidRobert; 07/29/18 11:35 PM.
live every 24 hour block of time like it's your last day on earth
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Re: best way to mark ports on heads ot intakes to port?
[Re: RapidRobert]
#2529828
08/01/18 04:38 AM
08/01/18 04:38 AM
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Joined: Jan 2003
Posts: 28,639
Shopping @ HoBo Fright
340SIX
OP
Doc Flappergas's Evil Twin
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OP
Doc Flappergas's Evil Twin
Joined: Jan 2003
Posts: 28,639
Shopping @ HoBo Fright
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I make a horizontle swath of Dyken across the top & bottom of the intake & head ports then scribe a horizontle line across the top & bottom of the ports in the dye (+slight porting ahead of time to get the top/bottoms of the ports even, as needed) then at each "end" of the scribed lines a 90 deg turndown in a bit more dykem. so you have an "L" at the end of each horizontle scribed line (I hope that descrip makes sense). Do the same on the intake then I set the intake down on the side gaskets (SB) & at each end of the eng tilt the manifold a bit up/down (side to side) till the lines between the heads & the intake have the same gap on each of the 4 corners. EDIT (SB) May need thicker/thinner side gaskets or even 2 pairs and or elongating the intake mounting holes or intake milling. Mockup dry & go from there. Thanks The intake was pro done as well as the heads. But thinking of doing stock 340 exhaust manifolds. When I have done stuff it was silver and easy to mark. I just want to gasket match and clean up the ports best I can. Never done anything other than soft stuff. So this should be an adventure. Here is a shot of the polish work on the heads. And the port work that was done on the intake. I only have 1/3rd the intake outside polished.  
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Re: best way to mark ports on heads ot intakes to port?
[Re: 340SIX]
#2529943
08/01/18 12:46 PM
08/01/18 12:46 PM
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Joined: Oct 2003
Posts: 11,689
W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,689
W. Kentucky
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With the engine assembled I use gaskacinch or contact cement to stick the gaskets to the head, just three small dabe about the size of a dime. Make sure the gasket and ports are lined up. Once it's set up I bolt the intake on and scribe a line on the gasket along the top of the intake, also mark each gasket for drivers and passengers side. Then unbolt the intake and remove the gasket, some contact cements may require a razor blade scraper to aid in removal. Then bolt the gasket to their respective sides of the intake making sure the scribe line matches the intake, then scribe the ports. I just use a black permanent marker around the ports before I scribe around the gasket.
Last edited by justinp61; 08/01/18 12:58 PM.
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Re: best way to mark ports on heads ot intakes to port?
[Re: 340SIX]
#2529976
08/01/18 01:39 PM
08/01/18 01:39 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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But thinking of doing stock 340 exhaust manifolds. Lookup acid porting exhaust manifolds on utube. good gains to be had.
live every 24 hour block of time like it's your last day on earth
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Re: best way to mark ports on heads ot intakes to port?
[Re: 340SIX]
#2530442
08/02/18 12:49 PM
08/02/18 12:49 PM
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Joined: Oct 2004
Posts: 2,849
Connecticut
FurryStump
master
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master
Joined: Oct 2004
Posts: 2,849
Connecticut
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It’s been a long time, but IIRC isn’t this a street car? What are your performance goals. I did notice a performance gain port matching and cleaning up the exhaust manifold entries a touch, but nothing big. I know of cars running 11.7 with just being port matched. With a free flowing intake side you could be low 11’s. Acid or extrude hone not really worth it unless you are shooting for that last couple of hp.
Last edited by FurryStump; 08/02/18 12:50 PM.
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Re: best way to mark ports on heads ot intakes to port?
[Re: 340SIX]
#2530515
08/02/18 03:08 PM
08/02/18 03:08 PM
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Joined: Jan 2003
Posts: 27,485
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,485
So Cal
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Dykem
Last edited by autoxcuda; 08/02/18 05:08 PM.
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