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Posted by: ChrisReale Jan 29 2003, 05:45 PM

What can one do to a pair of stock 2.0L heads to improve power, reliability, longevity and all that? I am thinking about 50,000 miles in the future, but I want to gather idea's now. The car is stock injection. Who would you send them to, porting and polishing, inlarged intakes...? Ideas

Posted by: Bleyseng Jan 29 2003, 05:54 PM

Chris, locally there is Jerry at NWCS who does good work on heads. You can port and polish them to a degree mostly working on the exhaust port carefully. Match port the intakes to the manifolds. Jake Raby likes to weld up the plug holes so you can install the smaller plugs to avoid the cracks across the plug hole to the intake/exhaust seats.
There are several other companies in California that do this work on heads. Depends on how much you want to spend and how much hp you want....
Staying with the stock Djet limits your choices mostly because of the mild cam not the 2.0l 914 heads.
Geoff

Posted by: Dave Cawdrey Jan 29 2003, 09:22 PM

Mine got done today. I'll pick em up tomorrow, and post pics and opinions...

Posted by: Dave Cawdrey Jan 30 2003, 11:26 PM

DAMN!! Heres one head:

Posted by: Brad Roberts Jan 30 2003, 11:44 PM

That pic scares me. Somebody pulled some material off that head big time. I find it interesting how he staked the seats.

B

Posted by: Dave Cawdrey Jan 31 2003, 12:01 AM

And my lightened, H-beam rods:

Posted by: Brad Roberts Jan 31 2003, 12:02 AM

How did he lighten them ?? and WHY do you have H beam rods for street engine ?? Does that say "chev" on them ??

B

Posted by: Bleyseng Jan 31 2003, 12:12 AM

I think it sure does say Chevy and those heads look like alot of material was taken off. Hard to tell . What's the valve sizes?
Geoff

Posted by: Dave Cawdrey Jan 31 2003, 12:18 AM

Took some material off the journal end. Chevy journals, for when I get the crank...

H beams for the deal. Got them balanced, rebuilt, lightened, and rebushed for 22 mm pins for 400. Its kinda turning into a track/street car.

Posted by: Dave Cawdrey Jan 31 2003, 02:08 AM

Stock size valves, Geoff. How about Sunday for the pass. pan? Chris wants to be there, but works till 4p on Sat. Lemmeno

Posted by: Bleyseng Jan 31 2003, 10:24 AM

Sunday will work for me, around noon? Where is the new location of the car?
Geoff

Posted by: Dave Cawdrey Jan 31 2003, 02:59 PM

Geoff,

Noon's good. Its in Fremont, 3601 Fremont Ave N. There is a parking garage off of 36th. Its across from the new Dubliner bar. You know Fremont?

Posted by: Bleyseng Jan 31 2003, 04:36 PM

Like the back of my hand, dude! Hoki's is another good spot and the Triangle is always good to pick up women plus the Redhook Alehouse is nice late on a Friday.
Geoff

Posted by: Dave Cawdrey Jan 31 2003, 04:47 PM

You know Dad Watson's? My family owns the building its in. We live upstairs, in 414. We'll be up there, just knock (if you dont see us downstairs)

Posted by: Bleyseng Jan 31 2003, 07:23 PM

Yes, I know Dad Watsons ( the food sucks since he died)
Geoff

Posted by: mr914 Feb 1 2003, 01:02 PM

Is Mark Stephens still in business? Heard he did good 2.0 big valve heads?

I'm in Michigan and have a pair of 2.0 heads that need to be rebuilt. No major hp planned, just a minor bump and a desire for reliablity.

Any suggestions?

Posted by: Mark Henry Feb 1 2003, 05:07 PM

Mark Stephens is long gone. I heard some bad things about his stuff, but it's all second hand so I don't know for sure. But that doesn't matter, he's gone.

Rimco and Audirac do T4 head work, both are in California. Don't know the sites off hand but you can find them with a simple web search or someone will chime in. I do head work but I doubt if you want to send them to Canada, (didn't think so, lol).

When it comes to heads don't cheap out, go with someone that does VW/Porsche all the time and pay to have them done right.

Posted by: Jake Raby Aug 31 2003, 04:51 PM

That head has to be the scariest thing I have seen in years!!! All those peen matks are pre detonation waiting to happen!

Those are a BIG mistake..

Posted by: Dave Cawdrey Aug 31 2003, 05:05 PM

What peen marks ?? Thats the staking of the seats. Those are freshly rebuilt...

Even Bleyseng refers to Jerry

Posted by: Jake Raby Aug 31 2003, 05:50 PM

Simply not needed...everyone has their own ways of doing things.
I have not had a dropped seat since 1997. That was 250 engines ago.

The main key is the seat material, combined with the interferance fit.

Like I said, to each his own....

Posted by: cgnj Aug 31 2003, 08:03 PM

Headflow Masters head. 44x438. Guess Adrian expects the seats to stay where he put them.

Carlos


Attached thumbnail(s)

Posted by: DuckRyder Aug 31 2003, 08:24 PM

Who did those,

I'd be scared that they would end up looking like this:

Posted by: Jake Raby Aug 31 2003, 08:46 PM

Headflow KNOWS HIS STUFF. Adrian has done 85% of my valve seat work in the last 5 years.......There is NO BETTER TIV head tech in the world, than Adrian....I have pretty much tried them all with my own demands for cylinder heads.

Posted by: Korijo Aug 31 2003, 09:43 PM

Everyone is soo SCARED of my heads.

Jerry is a reputable machinist. Ask anyone here in the NW.

I don't wanna send my $$$ to another state,
when I could help out a local VW/Porsche business.

I trust him. Many others do to !!

Posted by: DuckRyder Aug 31 2003, 09:54 PM

If only he would return calls or answer his phone.

(It has been a while, but I gave up on the guy)

Posted by: ChrisReale Aug 31 2003, 10:02 PM

I agree with Dave, Jerry has been doing this stuff since we all were still in our mothers womb(that includes you 40 somethings!). If ya dont like it, dont have him do your heads. Probably 90% of the Porsche?VW's around here that have had rebuilt engines Jerry has prolly done the heads.

Posted by: Dave_Darling Aug 31 2003, 11:25 PM

True, Chris. But those photographs have removed Jerry from my "short list" of people I would send my own cylinder heads to.

--DD

Posted by: Korijo Aug 31 2003, 11:54 PM

Why ?? Its a picture... Seeing them, touching them; you MAY get an idea of HIS way. There is no ONE way to do a task.
Maybe, in his many years of experience, he learned a new way to "better" the 2L seat drop issue

I'm happy w/ how they turned out. And thats what matters...

Just my "nickel bag o' funk" ($.02)

Posted by: ChrisReale Sep 1 2003, 12:05 AM

Then dont.

Dave, were those 2 liter heads of your 1.7's?

Posted by: Bleyseng Sep 1 2003, 08:59 AM

Jerry didn't "stake" my valve seats in when he did em 3-4 years ago. I should swing by and talk to him about what and why he is doing that now. He did do a nice job of porting the heads as they make nice power.

Chris, I think those are the 1.8 heads not the 2.0L ones.

Geoff

Posted by: DuckRyder Sep 1 2003, 09:25 AM

Damb, yous guys are awful touchy about it.............

Perhaps the stakes are not as severe they appear in the photo. The rest of the heads look nice (if one can judge that sort of thing by looks)

I would be concerned that the stakes would create hot spots and cause pre-ignition problems particularly if the compression is raised.

Nothing wrong with a little discussion about it.

Certainly there is more that one way to do things, but I don't see the need to throw the bird and "F" word around.

The guy who did the head in my photo, does probably 85% of ALL the heads that are redone around here, but that sure doesn’t mean he didn't screw that one up. By the way, there were indications that that little spot on mine was pre-igniting, and they don't have more than 500 miles on them.

I'm not trying to rain on anyone’s parade, but if Brad and Jake are worried about it, that would be enough to get me to make a phone call or two. Someone else says their heads by the same guy were not staked like that (or at least didn't appear to be) it may very well be that the stakes were supposed to be polished out or heli-arced over and they some how got shipped without it having been done?

Posted by: Jake Raby Sep 1 2003, 10:50 AM

Any pit like that in a chamber must be polished, else it will cause detonation much earlier than if it were polished away.........

Posted by: Charles Deutsch Sep 1 2003, 11:17 AM

Jake,

Would the end of a Heli-Coil insert protruding into the combustion chamber (stock 2.0) cause preignition problems? (Glad you're here, btw.)

Posted by: Korijo Sep 2 2003, 01:58 AM

Nope. 2L heads.




The pitting is not very deep. Its MORE pronouced in the photo. Looks worse on the monitor.

Now, I'm getting worried

Posted by: Racer Chris Sep 2 2003, 02:46 AM

Why would the end of a heli-coil prodrude into the combustion chamber? I assume you are talking about a spark plug hole repair. If it was done properly it wouldn't stick out at all.

Posted by: rdauenhauer Sep 2 2003, 11:02 AM

So Jake, on the topic of spark plugs and Type4 heads, its been suggested that you advocate the Weld up of the existing spark plug hole to re-tap for the smaller Motorcycle type plugs (10-12mm).
Is that correct ?
Seems logical to avoid the cracking weve all seen but is there any downside?
IF you go to bigger Valve sizes do then creep back into that territory?