Port matching
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New User
Joined: Nov 2012
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Port matching
I just got some new heads from my machine shop, with new valves, springs, guides, seats, and all put together. So my question is can i port match them still? Or am i risking damaging my new machine work and valves? Can i port match and then clean out the debris as well as possible and be fine? Thank you!
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
Yes still doable but this shouldda been done before getting the heads rebuilt.
Install a valve cover and tape the mating surfaces to seal it. Stuff each runner with a rag. Some guys use shaving cream. You have carbide attachments and a die grinder, right? Other tools: scribe, machinist dye, shop vac. Port match only the first inch of each runner. Leave the runners slightly rough to preserve some surface turbulence and to avoid laminar flow.
Install a valve cover and tape the mating surfaces to seal it. Stuff each runner with a rag. Some guys use shaving cream. You have carbide attachments and a die grinder, right? Other tools: scribe, machinist dye, shop vac. Port match only the first inch of each runner. Leave the runners slightly rough to preserve some surface turbulence and to avoid laminar flow.
Postmaster
Joined: Oct 2010
Posts: 4,656
Likes: 4
From: Northern and Southern Cal
Maybe this will help illustrate my point. The heads flow fine for the street already IMHO and IMHO just need cleaning up. But the manifold to the head intersection is where the shape could use a little help. Take a look at the manifold in the pic. Thats how much extra material is there that has to be taken out to match the head port.
I'm just saying if you're going to run it on the street, you don't need to go over board with porting on the head.
Just my opinion.
I'm just saying if you're going to run it on the street, you don't need to go over board with porting on the head.
Just my opinion.
Mountain Pass
Joined: May 2006
Posts: 173
Likes: 2
What is the intended application for this engine? For most applications short of a race engine, unless there is a huge port mismatch, I doubt that spending a bunch of time grinding on the heads, or intake for that matter will give you any more than a bunch of metal dust in your hair, and that awful taste in your mouth. I can`t imagine you would see any performance gain that could be felt either on the street, or at the track, at least for most street applications.
More Turbo
Joined: Oct 2011
Posts: 636
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From: down a red dirt road
I don't usually mess with the intake side, for one reason it can ruin the turbulence needed for a good mixture and stay street able and two, usually way to much work/too much material will have to come out.
My lil 306 I built I fully matched the exhaust ports to the gasket and fully matched the manifolds and polished as far in as I could. I believe it gave very noticeable throttle response although the bottom end was fully balanced also and probably what made the biggest difference!
my new FE build I did the same but I've yet to run it... I'm like five wires away!
My lil 306 I built I fully matched the exhaust ports to the gasket and fully matched the manifolds and polished as far in as I could. I believe it gave very noticeable throttle response although the bottom end was fully balanced also and probably what made the biggest difference!
my new FE build I did the same but I've yet to run it... I'm like five wires away!
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Yes, i have a die grinder, carbide burs, endmills, burr *****, machinist die and all other tools needed for port and polishing heads. Normally i would do it before but long story short i ended up getting different heads and my others were already done.
The application is in a 4x4 with a 390 new pistons .060 over, new comp 268 cam, streetmaster intake, headman headers, and a Holley 600. I was just looking to squeeze what i can out of what i have, the work and time that goes into it isnt a big deal to me i dont mind it. I will probably just do the intake and not risk getting **** in my heads.
The application is in a 4x4 with a 390 new pistons .060 over, new comp 268 cam, streetmaster intake, headman headers, and a Holley 600. I was just looking to squeeze what i can out of what i have, the work and time that goes into it isnt a big deal to me i dont mind it. I will probably just do the intake and not risk getting **** in my heads.
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