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Porting and polishing cyl head ports

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ChadS

02-03-2005 06:44:44

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Good morning Antique tractor pullers! Its warming up a bit here in Northern Indiana, and have been liking the temps above freezing for a day or 3. I had all the tractors running yesterday, after a long nap. I had a few hours to kill late last night, so I broke out my Die grinders, and my IH truck head,for my 460, and started gasket matching the head to the gasket. Sure did not take long to realize, that this was kinda relaxing. And patience worked the best on this area of play. I started out on the Exhaust ports, and OMG! they were able to be opened up to nearly double in size, just going out to the shape of the gasket! I am a firm beliver that the exhaust ports can be opened up as large as possible, long as it is not too thin around where water is on the port wall. On this head, I did not have to worry about that, it is like it is open behind the port opening, and shrinks down in size as it exits the manifold. Now, I may get a chance to port the intake ports, and it is awful tempting to open them up as well. At least to the gasket pattern. These style of head, are pretty large in the ports past the port opening itself, and My judgement was kinda clouded to decide to open them all the way up, these engines seem to be a high rpm engine, not like the 4 cyl IH engines, so, Im at a stand still on what to do to the intakes. Should I open them up? or just lightly polish them? IH 4cyls are a different story to the 6 cyl, Just dont want to over do it. What do you all think? Ill post a photo of the tractor head, and the head Im working on,, let you be the judge,,, any info would be great! ChadS

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ChadS HEAD PIC!

02-04-2005 16:12:22

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

here is a photo of what Im working with. Chads

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ChadS Another veiw

02-04-2005 16:14:36

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Re: Porting and polishing cyl head ports in reply to ChadS HEAD PIC!, 02-04-2005 16:12:22

another veiw. ChadS

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Randy SE-MN

02-04-2005 06:11:40

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

I did late model dirt track racing for 10+ years, only after I was building engines on the side for everything and everybody else. The class I started in was Super Stock, and the engine rule was almost unlimited but for a 500 cfm carb max. The "claimer Rule" is the self policing aspect of local racing. Due to the resriction of air into the engine by the two barrell card, the old adage is very true...Air travels faster through a smaller opening, thus very much enhancing VE (volumetric efficiency) I could twist an unbalanced 355 clean up to 7500 rpm at the end of the straight all season long, and the throttle response was indescribable. I always unshrouded and opened up and port matched the exhaust. (mind you I was running somewhere in the nieghborhood of 13.5 comp) but I only unshouded the intake port to perfect the incoming charge, using the small chambered heads of course. I would definately unshroud and smooth the intake port...use your imagination as to how the air will flow. I don't have any idea if anyone makes swirl polished valves for your engine, but if you want the most, they will do the job.

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02-03-2005 19:59:34

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

#1.Rule of port and polish work in heads and maniflods , If you don't know what you are doing you should not do to much, drastically altering the shape,size, or location of the opening or port could destroy the head, best bet is to do a light deburring/clean-up or send it to a professional.

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JonM

02-03-2005 20:41:06

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Re: Porting and polishing cyl head ports in reply to LW, 02-03-2005 19:59:34

Victor jr- 3500 to 8000 rpm , according to my summit catalog, ex. if the port opening on the head is smaller than the outlet of the manifold their will be unwanted turbulence, i try to gasket match any engine i build , v8 or tractor, anything to make them idle or perform better will help with power or fuel economy.

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02-05-2005 14:43:34

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Re: Porting and polishing cyl head ports in reply to JonM, 02-03-2005 20:41:06

Yeah thats unwanted turbulance when you are tuning 3,500 to 8,000 on a low rpm engine some turb. is needed to help keep the fuel suspended.

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Chip

02-03-2005 19:44:52

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

The Edelbrock Victor Junior manifold is designed to mismatch the ports. Installation instructions tell you not to match the ports just make sure the gasket doesn't hang out in the open. This design stops reversion of the air flow. Reversion is when the air is stopped suddenly (by a valve) the air bounces back, reversing direction, then the valve opens again then the air has to reverse again. Some manifold runners have ribs cast into them,to help?? Think of waves on the water, if the valve opens at the certain time, certain RPM, the cylinder will get a big gulp.

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Butch-Ky

02-03-2005 19:42:32

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

Put head on tractor run either a rich mixture or add a little 5w oil to gas so you can look at top of piston to see how your flame pattern is across piston. If you are running flat top pistons you can change pattern by Frecting the top with a series of small hloes with a drill

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Drew

02-03-2005 16:12:24

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

I'm with Clarence on this one. Call Jeff @ Murphys, he has worked on those heads before. If the exhaust runner is not matched to the intake runner flow, you may have just went backwards grinding it all out. Bigger IS NOT ALWAYS BETTER!!! Jeff can explain to you better than I can about how well you want the exhaust to flow compared to the intake. It is possible for the exhaust to flow too good.

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clarence barenie

02-03-2005 15:36:08

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

i've got 10 hours in a farmall head rite now and i'm not done yet. GIVE MURPHY MOTOR SERVICE A CALL AND see what he think's about bigger exhaust runners. At this particular point in time, I think the exhaust side is breathing to well.(on a four cylinder)

just an opinion !

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JonM

02-03-2005 14:33:30

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

How does the gasket match the intake? if the manifold holes are larger, then I would want the opening of the head to be the same, for a smooth transition of air/fuel, doing a clean up of the bowl area under the valve is the best place to pick up a little flow, just be careful not to nick a valve seat

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ChadS

02-03-2005 15:08:21

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Re: Porting and polishing cyl head ports in reply to JonM, 02-03-2005 14:33:30

Thanks gentlemen! Some real good points to ponder over. I did not get a chance to take any pictures, darn batteries were dead in the camera! I thought bout it, and have decided to just polish up the intake ports with rough grit. Its looking pretty good! On the exhuast ports, I openend them up to the gasket, and that really opens it up. The truck heads, though a smaller casted port opening, VS a tractor head, behind the port, where it enters to the valves, (truck head) is huge!! They are casted differently, and are much more open and dont have to cut alot, just the opening to make it pretty straight through. The intake ports are a tad bit samller than the tractor head in diameter, There is 3 small rings that fit inside the gasket, pressed fit into the head, to align the manifold to the head. Im not too concerned with this, due to it being bigger inside the port itself, Just going to smooth out the rough spots. The Tractor manifold is a bit larger than the head port, but pretty close. I think,, it will create a good vacuum draw, through the updraft carb to give it a nice mixture upon atomization. My plan for this pulling tractor is to run around 3000 rpms, no more,,, either a 291, or a 301 kit will be installed. I belive with this head, and the cubic inch increase, it might be very close to 110 hp at 3000. And at 3500-4000 lbs,, should have a good grunt when the load is on! The old tractor head is so restricted, It has made me wonder if the head design was at fault for the 460-806 gassers to burn up valves so easily, the head cant get rid of the the heat from the exhaust, and well it leans out, and burns up. The stock 263 in it now, has problems, It sounds so clogged up when reving it up, the engine is there, but it is kinda slow, to rev up, it will stutter, then catch on,, and stay there. The truck engines were a high rpm engine, same block as the tractors in design, just, detuned. Thanks again for all you guys helping me. Ill post a pic tomorrow. ChadS

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A.P.

02-03-2005 08:05:03

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

Unless you are going to turn a LOT of rpm's you are not going to need big ports. Build some cubes if you want to go this way or turn it real hard.

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Cshaffer

02-03-2005 07:08:54

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Re: Porting and polishing cyl head ports in reply to ChadS, 02-03-2005 06:44:44

You have to remember sometimes too big can hurt HP in porting. Depending on big your B & S is. If too big on porting the air and fuel can not get mixed well. Also you don't want it too smooth so the air and fuel can tumbel and help mix.Hope this makes sense to you and hope it helped.

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buickanddeere

02-03-2005 08:12:11

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Re: Porting and polishing cyl head ports in reply to Cshaffer, 02-03-2005 07:08:54

Amen. Just clear off the casting flash and maching rough edges with a coarse stone. Then scuff up the rest of the port for fuel droplets puddling is reduced by the wall turbulance. Flow and torque is mostly from an inch upstream and an inch down stream of the valve. This is where the fancy intake valve head & stem shapes aissist flow. Along with a quality 3 or 5 angle valve job and blending the edges.

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Oli 70 puller

02-05-2005 17:30:48

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Re: Porting and polishing cyl head ports in reply to buickanddeere, 02-03-2005 08:12:11

Don't forget what rpm that truck pulls compared to your tractor.If you port anymore it'll be to big.

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buickanddeere

02-06-2005 22:47:44

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Re: Porting and polishing cyl head ports in reply to Oli 70 puller, 02-05-2005 17:30:48

I was trying say, keep the stock port dia and volume. The cleanup grinding, fancy valve shape and seat shape. This should increase, not decrease port velociy.

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