Did a search and couldn't find a thread with specific info on the subject.

Here is some of what I have found (others have) Least expensive to most expensive:

Demon DS has done port matching work only.

Rocky has done his own porting and matching.

Sand45 - His quad shoots the hill great. He had "I had precision motorcycle do mine. Its hard to tell in performance just becuse i had them do alot of other upgardes at the sametime. Ill pm you his number am sure he could give you some tips. " Price for the work was $175

MarkyNark had Holeshot racing do his head work (also matched it to the intake manifold) not sure on pricing. Performance??? Any third party opinions?

Boxman has price info for ATV custom cycle in Arizona (please let us know what they do and what they charge.)

Sam Coe offers porting and 1mm larger valves for $500.

Robertson Cycle did work for Velocityraptor (I know not a DS) but, apparently they do work for the DS too. Any info? Sandman430, was that $900-$1000 for port, matching 40mm valves, anything else? (Doesn't include cams right?)

Ron Woods has porting and matching + larger valves 40mm intake / 34mm exhaust for $1820

TVI has porting, matching + larger valves (states 20% more flow than Ron Woods) $2600-$2800 (price includes heavy duty valve springs with shim under bucket, web cams, heavier duty head studs with larger diameter bolts - includes bore of cylinder to accomodate larger head bolts that hare harder and less prone to stretching - AngryBajaBoy, was it you that had problems with this?, etc.) Also avail, o-ring match head/cylinder - "great for use with NOS."

Team Pami Head - I thought I heard it was about $3000-$3500. No idea what it included.

Is this all correct?

Who has what and what do you think. I want to make a move quickly on something and I need your opinions.

Bad thing about the head is once it has been messed with, my understanding is most people don't want to touch it. So, if I have Precision or Holeshot do work on it, I won't be able to get Ron Woods to do work at a later date should I decide I want larger valves. Sounds like Rocky would disagree "Unless it got flattened under a steamroller there isn't much that cant be fixed on an aluminum head." Hope you don't mind me quoting you. [img]i/expressions/face-icon-small-wink.gif[/img]

 

you need to find a guy or shop that knows what kind of riding you do. so they can set your head up for that style. big values(to me) will help ALOT on the top end. they could cost you a little in the lower RPMS.


i'm still running stock values and will soon go to bigger ones. i will be able to help you on the difference between them, but it will be awhile before i got it done.

 

Here is my opinion on the DS portwork. The DS does have some areas that need some attention on the head. They are not huge restrictions and the DS head flows very well right out of the box. If your looking at this being one of your first mods, don't expect big gains from it. What you can expect is to get more bang for your buck whith each and every mod you do from there on out. Hightower talked to Elliot at Ron Woods and Elliot told him there wouldn't be much gain from port work without at least going to a bigger carb. I definitely believe that now. I'm not sure on the larger valves, but generally by going to a larger valve you lose some air velocity at low rpms and do lose some bottom end. Thats no fun for trailriding. I would expect a bigger bore/stroke to be able to compensate for the extra port size on the bottom end and therfore not lose anything at all on the bottom end. It really depends on what you want to do and where your priorities are.<u>You have to ask yourself what you want and how much you want to spend</u>and then get a combo figured out from there. The portwork I did can only help for what I have planned for the my quad. Its not that hard to do, but experience definitely helps.

As far as what I said about an aluminum head always being repairable unless it was run over by a steamroller. I believe I was referring to JeffinRivercity that said he had some damage done to his head. Either way even a bad port job can be fixed, it will just cost you more and some don't even want to do it. Aluminum can easily be welded and intake ports are easily fixed with welding or JB Weld, lots of drag racers use it. The exhaust port can be a bit trickier to fix with the higher temps it sees. Going too thin in some areas could cause you to break through to a water jacket.

 

Yeah that was me with the head bolts, but it was more the nuts that gave me problems. I highly recommend the TVI head bolts from Gary he had them custom made.

 

Great info guys. I plan on adding a high compression piston, cams, valve springs, and a carb at the same time.

Since DSMike doesn't have his installed yet does anyone else have any inpt on what he head does by itself when the other mods are present.

AngryBajaBoy, my understanding is that I have to send my head and cylinder to TvI to have them bore the bolt holes to accept the larger head bolts. If I don't go with TVI I would not be able to go after that option. That gives TVI a bit of a + in the selection process. Did you end up with these bolts? Did you get the o-ring job at the same time?

Thanks for the continued input.

 

I really have no idea if my little tinkering did any good or not. I think one of 2 things have happend. A freind of mine had some sand get into his cylinder and score it up and he was loosing alot of compression. Well to be honest I am now nervous as to if I may have indeed the same problem from when my carb filled up with sand. It does seem as if my quad has lost some of its magic, I know a carb is a good upgrade but i am having a very hard time beleiving it made that much difference on DSa's quad. maybe it did but it seems like i am losing alot more than i used to to less modded machines. When I get my DS back I am going to do a compression test on it. Thats the best way to tell if there is internal damage to the rings/walls.

OR I have maxed out the HP potential of the stock carb and I am not seeing any of the benifits until I do upgrade. Now if I could just find a few more quarters in the couch coushins??!!

 

You may want to PM Majorecho, he did a fantastic port job on his head. I know he wont do it for ya, but he might could provide ya with some good info on how to do it. Might save ya some big$$$$$

 

Just thought I would let you guys know that I made my decision and I went with: Piston 11:1 (wanted to be able to run pump gas out of the Weekend Warrior), cams, HD valve springs (with shim under bucket), race head with larger valves, 45mm carb and heavy duty clutch springs. [img]i/expressions/face-icon-small-happy.gif[/img]

Should be up and running in about 3-weeks.

I hope I can make it up the hill. [img]i/expressions/face-icon-small-wink.gif[/img]

 

So you went with Ron Woods Eh!? Gary never sais anyting to me about having to bore out the head for those bolts but then again? I would really love to get that head work done but man $1500.00 bones is a lot of damn money! I know there is a little labor involved because I used to do Car engine head mods but, this 1.5k is a little crazy I think. I would pay a grand for it though![img]i/expressions/face-icon-small-wink.gif[/img][img]i/expressions/face-icon-small-sad.gif[/img] I am considering a full ehaust but I just don't know about that either. That HMF flows real nice and I think I will have to agree with them that they couldn't squeeze not even 1 more HP out of a full exaust. I still haven't see a fu;ll exahust with as big a head pipe as the stock one. I like the way they go into the collector, also that collector is huge! I thought about the Trinity but it piises me off they didn't make provisions for a heat shield, that is way to lame man! Anyone else making any full exhausts yet besides the usual?

 

Angry, Well there is a huge advantage to going with a full pipe. Major put a Trinity on his as you know and it is a nice pipe even though they did something even stupider than the heat sheild, they dont give you anything to seal the head to the pipe. Were not sure if he gained anything or not from the pipe as far as HP is concernd but the one thing that was definatly evident was how much cooler it runs now, Dsa has problems with heat, even though the Engine Ice does seemed to have helped and he has a slip on. I have never had heat problems with mine and I think it is do to the pipe. I can say though without a shadow of a doubt I gained big from my pipe. I think with your new mods, its crazy to keep choking the engine and letting that heat reside in it. Just my .02

ohh and both the woods pipe and the trinity have a larger diameter head pipe than stock. There is no way in hell the stock pipe can flow more air or even the same amount than either of them.