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Author
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Topic: Port-Matching Intake?
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thumpin cat
Gearhead Posts: 474
From: Santa Barbara, California
Registered: Mar 2002
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posted 07-09-2003 11:04 PM
  
I mocked up my Victor Jr. Manifold and Victor Jr. Heads to see how they matched up. It seems like the top of the port on the head comes down just a tiny bit into the opening of the intake port. Other than that it seems that they line up pretty damn good. Can i get away with this or should i have the heads ported a bit to match the intake? please let me know thanks.
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mvierow
Gearhead Posts: 209
From: Bay Area, Ca
Registered: Apr 2001
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posted 07-09-2003 11:10 PM
Intake ports were larger than the head ports? Usually it's the opposite, or atleast manufactures try to make it that way. How much is a little? 1/16"? I'd definately those up especially since those parts aren't designed to make power until the rpm, and therefore, cfm, is really high.
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thumpin cat
Gearhead Posts: 474
From: Santa Barbara, California
Registered: Mar 2002
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posted 07-10-2003 12:44 AM
The head ports are bigger than the intake ports but the intake is mis-aligned so the head ports hang a bit low into the intake ports. Do you think i should port the opening of the heads so they match the intake or do you think i should have the intake lowered so it lines up with the heads?please let me know thanks
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mvierow
Gearhead Posts: 209
From: Bay Area, Ca
Registered: Apr 2001
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posted 07-10-2003 01:07 AM
It's not going to do any harm other than restrict airflow, which is exactly what your trying not to do with those parts. I'd fix them up, atleast so the head port doesn't protrude into the airflow path. There really isn't any point to not doing it all though, so go for it and have it fully port matched. I port matched my air gap rpm performer to my AFR's for 150 bucks, though only the intake needed to be touched. he wouldn't tell me an exact answer when I asked how long it took him, but you could consider it to be about double if they need to disassesmble your heads, port then reassemble.
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Butch Jennings
Gearhead Posts: 626
From: No. California
Registered: Apr 2000
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posted 07-10-2003 10:00 AM
Did you mock it with or without a gasket?------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.231
Butcher's Home Page
"Friends don't let friends drive Chevys"
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 07-10-2003 11:14 AM
If the head port is protruding into the intake air stream it would be a good use of your time to match them.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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thumpin cat
Gearhead Posts: 474
From: Santa Barbara, California
Registered: Mar 2002
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posted 07-10-2003 04:37 PM
What if i used silicon instead of the cork end gaskets on the intake and had the intake thread holes lenghthened so the intake sits lower. What do you think?
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 07-10-2003 05:12 PM
Sounds like way more trouble than port matching the intake and an invitation for vacuum leaks.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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mvierow
Gearhead Posts: 209
From: Bay Area, Ca
Registered: Apr 2001
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posted 07-10-2003 07:53 PM
don't run the cork end gaskets either way. I'd take Butch's advice and make sure you mocked your intake to the head properly before you did anything.
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JCQuinn@work
Gearhead Posts: 850
From: Lakewood, CO, USA
Registered: Jun 2001
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posted 07-11-2003 11:03 AM
I always throw away the end gaskets of an intake manifold set. I also always use silicon to seal the ends. Way fewer leaks and port matching problems that way.I have built dozens of engines for street and race use and the silicon is the best method I have tried. John
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