Need porting/matching advice...
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Need porting/matching advice...
Today or tomorrow.. I'll receive the Victor Jr. Intake that I bought off Ebay recently.
I'm planning to match the intake to the 1205 gasket...
I've never done that - so I wonder what I need to do that. Can I just get some grinder inserts for my Dremel and use those???
What's the best way to do the matching??
Any input is appreciated!
Oliver
[Modified by GrandSportC3, 2:17 PM 11/25/2003]
I'm planning to match the intake to the 1205 gasket...
I've never done that - so I wonder what I need to do that. Can I just get some grinder inserts for my Dremel and use those???
What's the best way to do the matching??
Any input is appreciated!
Oliver
[Modified by GrandSportC3, 2:17 PM 11/25/2003]
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From: Forked River NJ
Re: Need porting/matching advice... (GrandSportC3)
I matched my stock LT1 intake to the gaskets. I used the bolt holes and had some dowels that are the correct size to hold the gasket. The gasket matched the heads perfectly so I just matched them. I used a die grinder with some stones and some sand paper rolls. I am by no means an expert on this and can't tell how much it helped but there is no flow restriction. The stock intake did require quite a bit of matching. I blended it all in so it was worth at least 100HP :jester well maybe a couple of HP.
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Need porting/matching advice... (Gordonm)
I matched my stock LT1 intake to the gaskets. I used the bolt holes and had some dowels that are the correct size to hold the gasket. The gasket matched the heads perfectly so I just matched them. I used a die grinder with some stones and some sand paper rolls. I am by no means an expert on this and can't tell how much it helped but there is no flow restriction. The stock intake did require quite a bit of matching. I blended it all in so it was worth at least 100HP :jester well maybe a couple of HP.
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From: In Dreams There Is Truth Ohio
Re: Need porting/matching advice... (GrandSportC3)
Matching can make a nice difference.. especially if both - heads and intake are matched...
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Need porting/matching advice... (GDaina)
Matching can make a nice difference.. especially if both - heads and intake are matched...
You think? I think not...waste of time and money...do a flow test before and after port matching...know how much cfm you will gain? ZILCH..NADA....now bowl blending, that's a complete different story
You think? I think not...waste of time and money...do a flow test before and after port matching...know how much cfm you will gain? ZILCH..NADA....now bowl blending, that's a complete different story
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From: Forked River NJ
Re: Need porting/matching advice... (GrandSportC3)
It cost me nothing and about 1 hour of time. Anytime you disrupt the flow of air it has to cut down on power. If the intake is larger than the heads the air/fuel will run into a brick wall.
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Need porting/matching advice... (Gordonm)
It cost me nothing and about 1 hour of time. Anytime you disrupt the flow of air it has to cut down on power. If the intake is larger than the heads the air/fuel will run into a brick wall.
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From: Rockingham NC
Re: Need porting/matching advice... (GrandSportC3)
The easiest way to port match is to put the gasket on the phead with the bolts, take a wide tipped permanent marker and trace the inside of the ports. This will tell you how much needs to come off the head. Then do the same with the intake. LOOK AT THE DIFFERANCE of amounts to take off and then see if you want to start carving up your intake and heads. To truly port match you cave to cut BOTH. :flag
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From: eville in
Re: Need porting/matching advice... (1970 Stingray)
good advice above, take it easy on dremel or you'll burn it up , use the carbid
cutters, were intake meats port ,have the bottom of the port just a little lower
then intake, it helps with anti-reversion, and if you run into puddleing
cutters, were intake meats port ,have the bottom of the port just a little lower
then intake, it helps with anti-reversion, and if you run into puddleing
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Need porting/matching advice... (1970 Stingray)
I have the Makita 25,000 rpm. I have a variety of sizes and shapes of carbide tips.
The best thing to do is: Forget the gasket because it probably is a slight mismatch to your heads anyway. Trace over the head with some thin card paper and a pencil. Then use a rasor to make the cutout exact match for a head template including the bolt holes. The bolt holes help you keep an alignment reference.
One problem that i can see right off is: Every VJ intake manifold I've seen is 1206 gasket size. So it's probably your heads that need the port matching.
I've ported alot of heads over the years. But I don't do heads anymore because aluminum heads have become a major investment. 5 minutes of bubba working on them could throw the cylinder to cylinder flow balance way out of whack.
My last heads - I took to a flow bench shop and they bolted the intake manifold to the heads and used a bore scope down in the port to match them as a unit. Manifold grinding port matching is relatively safe and easy. Most out of box new manifolds require a couple hours of work
The best thing to do is: Forget the gasket because it probably is a slight mismatch to your heads anyway. Trace over the head with some thin card paper and a pencil. Then use a rasor to make the cutout exact match for a head template including the bolt holes. The bolt holes help you keep an alignment reference.
One problem that i can see right off is: Every VJ intake manifold I've seen is 1206 gasket size. So it's probably your heads that need the port matching.
I've ported alot of heads over the years. But I don't do heads anymore because aluminum heads have become a major investment. 5 minutes of bubba working on them could throw the cylinder to cylinder flow balance way out of whack.
My last heads - I took to a flow bench shop and they bolted the intake manifold to the heads and used a bore scope down in the port to match them as a unit. Manifold grinding port matching is relatively safe and easy. Most out of box new manifolds require a couple hours of work
Race Director
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From: In Dreams There Is Truth Ohio
Re: Need porting/matching advice... (GrandSportC3)
Matching can make a nice difference.. especially if both - heads and intake are matched...
You think? I think not...waste of time and money...do a flow test before and after port matching...know how much cfm you will gain? ZILCH..NADA....now bowl blending, that's a complete different story
Why do all the racers match their ports if it won't make a difference???
You think? I think not...waste of time and money...do a flow test before and after port matching...know how much cfm you will gain? ZILCH..NADA....now bowl blending, that's a complete different story
Why do all the racers match their ports if it won't make a difference???
The Flow Bench doesn't lie.
Le Mans Master
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From: Santa Ana CA
Re: Need porting/matching advice... (GDaina)
"How all this came about, we saw an episode on Hot Rod TV, they did a base test on bone stock heads, first test was gasket matching, no change, next test was bowl blending, big change, tripple grind, increased flow, polishing, no change, and some other items, can't remember what....the the crux is that port matching does nothing."
Maybe, maybe not. Perhaps the port matching does nothing by itself, but aids the other modifications. What it they blended the bowls before they matched the ports? Maybe then they would have seen a gain.
On the other hand, there are those that tell you that on a stock engine you actually want the intake manifold port smaller than the head's intake port to reduce reversion.
[Modified by toddalin, 8:07 PM 11/25/2003]
Maybe, maybe not. Perhaps the port matching does nothing by itself, but aids the other modifications. What it they blended the bowls before they matched the ports? Maybe then they would have seen a gain.
On the other hand, there are those that tell you that on a stock engine you actually want the intake manifold port smaller than the head's intake port to reduce reversion.
[Modified by toddalin, 8:07 PM 11/25/2003]
Thread Starter
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Re: Need porting/matching advice... (MotorHead)
My Victor Jr. is port matched to a 1206, have you put a 1205 up against it yet ?
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Joined: Sep 2003
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From: Indianapolis IN
Re: Need porting/matching advice... (MotorHead)
The "Book" method is to take machinists dye and stain the entire surface. Then lay the gasket on and use an awl to scratch a line in the dye using the intake gasket as a template.
Everything I've read says it makes little difference. I wouldn't pay anyone to do it but as long as you have the tools it certainly won't hurt. I'd at least check them to see if any are way off. I've seen some that were way off and I'd think it would make some difference. If it made no difference at all the pros wouldn't do it.
Everything I've read says it makes little difference. I wouldn't pay anyone to do it but as long as you have the tools it certainly won't hurt. I'd at least check them to see if any are way off. I've seen some that were way off and I'd think it would make some difference. If it made no difference at all the pros wouldn't do it.
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From: Kona Hi
Thread Starter
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St. Jude Donor '03, '06, '17
Re: Need porting/matching advice... (Chevyguy)
:cool: :cool: :thumbs: :thumbs:
Added that site to favorites!! :thumbs: :thumbs:
Added that site to favorites!! :thumbs: :thumbs:
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From: eville in
Re: Need porting/matching advice... (GrandSportC3)
it works, it's one of the Details to building a engine that adds a little edge on
the guys that just bolt part a to part b . it's all in the details....
the guys that just bolt part a to part b . it's all in the details....