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how important to gasket match intake to head? #2089838
06/10/16 10:25 PM
06/10/16 10:25 PM
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kielbasa Offline OP
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Hi guys, am about to install my intake....super victor going on a small block stroker.
The port on the head is larger vs the port on the intake, sooooo I'm thinking how necessary is it to match? If it was the other way around (manifold port larger than the head) I assume it would be an issue, but the way it is, maybe not so much?
Thanks for any info!

Re: how important to gasket match intake to head? [Re: kielbasa] #2089849
06/10/16 10:42 PM
06/10/16 10:42 PM
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sixpackgut Offline
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Your reducing the size of the port. On a stroker...


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Re: how important to gasket match intake to head? [Re: kielbasa] #2089852
06/10/16 10:47 PM
06/10/16 10:47 PM
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Pattison Texas
CSK Offline
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it is much better to have the port on the head a little bigger than the intake I say run it!!!!!


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: how important to gasket match intake to head? [Re: kielbasa] #2089958
06/11/16 01:25 AM
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Scully Offline
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The valve is the greatest restriction, the port alignment means next to nothing but it looks good to the eye.

Re: how important to gasket match intake to head? [Re: CSK] #2089965
06/11/16 01:53 AM
06/11/16 01:53 AM
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Romeo MI
MR_P_BODY Offline
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Originally Posted By csk
it is much better to have the port on the head a little bigger than the intake I say run it!!!!!


Its called turbulence....I make them as smooth as
possible on the match point..... use your gasket
and match it to the larger of the two them cut on
the other.. if the head is smaller.. blend the head
about 1"in.. if the bowls havent been touched that
is the biggest improvement.. my W-5s are a touch
bigger on the bottom so I will be working on the
intake tomorrow... its about .030 off on the bottom..
its due to using a different block.. the W-2s lined
up perfect..... as they say.. a engine is a pump and
the smoother the air gets in and out the better the pump is
EDIT
the tops and sides look great...maybe its only .020
but I will partially torque everything in place
tomorrow to make sure
wave

Last edited by MR_P_BODY; 06/11/16 01:58 AM.
Re: how important to gasket match intake to head? [Re: kielbasa] #2090030
06/11/16 08:55 AM
06/11/16 08:55 AM
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"Little"John
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Originally Posted By kielbasa
Hi guys, am about to install my intake....super victor going on a small block stroker.
The port on the head is larger vs the port on the intake, sooooo I'm thinking how necessary is it to match? If it was the other way around (manifold port larger than the head) I assume it would be an issue, but the way it is, maybe not so much?
Thanks for any info!






I hate to tell you this because the Super Victor is not a CHEAP intake but they kinda stink with-out some porting work. When I received one in a trade I was very disappointed the first time I stuck it on my flowbench for some testing. At the very least gasket match it.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: how important to gasket match intake to head? [Re: kielbasa] #2090051
06/11/16 11:35 AM
06/11/16 11:35 AM
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Mt Morris Michigan
mopar dave Offline
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Mike at MRL Performance built a 470 awhile back using 440-1 iron heads non ported and a supervic intake. did not port match and the beast still made 730+hp

Re: how important to gasket match intake to head? [Re: kielbasa] #2090053
06/11/16 11:42 AM
06/11/16 11:42 AM
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kielbasa Offline OP
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my concern if I gasket match it, the matching will have to go very deep into the manifold, the head port seems that much bigger (max ported eddies), if I just gasket match it, it will look like a "cave" in the manifold and might be worse than just leaving it alone?
I think it would end up being a job I would have to farm out (porting the entire intake). If the matching only gives me 5 horsepower or so, I'm not gonna do it - not looking for the last available ounce of horsepower for this application - the only reason I have this manifold is it already has the efi injector capability (car will be efi).....
Thanks for the info so far!!

Re: how important to gasket match intake to head? [Re: kielbasa] #2090066
06/11/16 12:07 PM
06/11/16 12:07 PM
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Mt Morris Michigan
mopar dave Offline
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you can always take it off and have ported later if it don't work out. may help with reversion as well if it has any.

Re: how important to gasket match intake to head? [Re: kielbasa] #2090107
06/11/16 01:35 PM
06/11/16 01:35 PM
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AndyF Offline
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Standard answer is "it depends".

Daily driver who cares. Trying to set the record in Super Stock? might want to make those ports line up.

Re: how important to gasket match intake to head? [Re: AndyF] #2090117
06/11/16 01:53 PM
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RapidRobert Offline
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I would think that the sharp dropoff (as is right now) would be far worse than the "cave" you spoke of that would be developed with matching em & on that I would go in far enough for as smooth tapered transition as possible. It'd cost an arm and a leg to farm it out but if you could do it your self I definitely would. EDIT if a person ain't never ported before I would highly suggest spending a few hours on a junk head just to get a basic feel for how it feels

Last edited by RapidRobert; 06/11/16 02:07 PM.

live every 24 hour block of time like it's your last day on earth
Re: how important to gasket match intake to head? [Re: RapidRobert] #2090131
06/11/16 02:18 PM
06/11/16 02:18 PM
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I've ported intakes for guys that race in classes that you are only allowed to (blend) into the port 1 inch and thrust me that takes some time. It sounds like you are not limited like this so trust me its worth doing. That intake stinks if untouched and the good old Victor beats it hands-down. One other thing to check out on the Super Victor. It sits MUCH higher and you may have to run valve cover spacers with some valve covers. Even with some grinding I had to so if the engine is out of the car check this out before installing.

http://www.medicemfg.com/products_get.php?c=Valve%20Cover%20Spacers%20-%20Mopar


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: how important to gasket match intake to head? [Re: kielbasa] #2090147
06/11/16 02:57 PM
06/11/16 02:57 PM
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kielbasa Offline OP
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i took another look at the intake now....with the combination of core shift in the manifold and the huge ports on the head, there may hardly be enough material to match the ports! roof and floor looks doable, but the sides will be close!
by this time the entire manifold may as well get ported....i've never done this, nor do i have the tools - and i will agree, i can easily see sinking 10 hours into this - doesn't look like a quick and dirty task i can do in a night after work.....
i guess my real question is, for a 500 hp pump gas street car, how much would i be giving up?

Re: how important to gasket match intake to head? [Re: kielbasa] #2090156
06/11/16 03:14 PM
06/11/16 03:14 PM
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justinp61 Offline
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I always port match my intakes, yes it takes some time but IMO it's time well spent.

Re: how important to gasket match intake to head? [Re: kielbasa] #2090157
06/11/16 03:20 PM
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Thumperdart Offline
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I always gasket match/blend the manifolds to the heads and see no reason not to unless they look good as is and that's not very often.......


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: how important to gasket match intake to head? [Re: kielbasa] #2090158
06/11/16 03:21 PM
06/11/16 03:21 PM
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Some intakes will give up 30-40 CFM when bolted on a set of heads. Just for an example I ported a set of Chevy Dart Platinum 215 heads for a good Friend. He didn't want to go with a bigger valve at the time so we ended up around 305 max flow so we bolted on his stock Victor Jr and with the intake installed the heads were now flowing 260 CFM. He told me to go ahead and port the Victor Jr but that he was still going to buy the 400.00 Dart intake. After I finished porting the Victor Jr we were only down 3-5 CFM with the intake on. Guess what, the Dart intake was down almost 35 CFM too so I ended up porting it later that year for him. Using the industry standard 35 CFM is approximately the equivalent of 70 horsepower.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: how important to gasket match intake to head? [Re: mopar dave] #2090270
06/11/16 07:24 PM
06/11/16 07:24 PM
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Originally Posted By mopar dave
Mike at MRL Performance built a 470 awhile back using 440-1 iron heads non ported and a supervic intake. did not port match and the beast still made 730+hp


And what would it have made if it was ported.. I never
seen them loose power when match ported.. if your concern
is version then the cam and headers are wrong
wave

Re: how important to gasket match intake to head? [Re: MR_P_BODY] #2090296
06/11/16 08:26 PM
06/11/16 08:26 PM
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mopar dave Offline
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Knowone knows, but he was very happy and surprized it made that much.

Re: how important to gasket match intake to head? [Re: kielbasa] #2090317
06/11/16 09:53 PM
06/11/16 09:53 PM
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mopar dave Offline
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i think whats more important and would give better results would be to port the intake as the intake needs to flow 20-30% more than your head intake port to prevent a bottle neck. IMO i dont think port matching 1" into the intake is worth much as you still would have a smaller port in your intake.

Last edited by mopar dave; 06/11/16 09:54 PM.
Re: how important to gasket match intake to head? [Re: kielbasa] #2090373
06/12/16 12:10 AM
06/12/16 12:10 AM
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sixpackgut Offline
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On a particular intake for a GM. I do a $100 intake port job for alot of guys. Its a gasket match and i only work on 4 runners in the plenum. Its worth at a minimum of 15hp on stock short block engines. Every time. Its a nice after my real job extra money to spend on my toys


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