dont even have 500 miles on new motor.started motor with 750 edel then changed whole system (filter,regulator,pressure gauge and mighty 650)
when i went to the demon i ended up having smoke problems burning oil dont know if i was coincedence or the carb switch but carb was very rich had prob's with it..problem with car is now it smells like its smoking oil and fuel usually at deceleration(high vacuum)or sometimes will just do it when i am at normal speed and come to a stop.how do i test to see if it is my valvetrain or short block.or fuel system.when i bought my protoplines i thought i read somewere were they had problems whith guides,but dont remember for sure.plugs have oil deposits but center electrode is dark tan.this has had me kinda disapointed cause of all the time i have invested.dont really want to pull motor but might hafta'.gettin' worse.!.!.!
shane

What valve guide seals are on them?

dont know brand but i put them on came in my gasket kit felpro.but they are the ons that you have to use the little plastic nipple so you dont scar the edges of the seal.
shane

Then almost certainly, they are the wrong seals. They probably aren't stuck to the guide, with the valve sliding through them; they are riding up and down on the valve stem.

Take a look and see if they've stayed affixed to the guides, or if they're acting like umbrella seals instead.

You probably need seals for aftermarket heads, with precision-sized valve guides, either .530" or .500" OD. The stock seals are for stock guides, which are quite a bit larger, and consequently the seal ID is larger.

Maybe a pcv pulling in oil? Any baffle under that valve cover?

took pcv off temporarily to see,not the problem..

these seals went on pretty tight around the valve
you think they still could be bad??they had a metal spring like band around them.
shane

what are the little o-ring looking seals that come
in some gasket kits..how do they stay down on the valve guide??
shane

after some surfing i have come to find out to use these style seals you need to machine the heads.do aftermarket heads come machined for these style seals?that is what they supplied to me when i purchased the protoplines unassembled..
could this be my problem?can i use regular umbrella seals to hold me over till i pull the heads?how do umbrella seals work,from what i see they just ride on the valve what keeps them from letting unwanted oil down in the guide??
shane

Yes that's all that umbrella seals do.

I (and you) can't accept responsibility for "what they supplied". All I know, is numbers and measurements. I'm rather heartless that way. My apologies. I just measure stuff, and then I know what to get, that fits.

I could be wrong, but I thought somewhere up above, you posted that you used the seals that came in some gasket set for stock heads, which you don't have? What I'm trying to tell you is, the seals you need, don't come in an over-the-counter gasket set. You've got to seek them out with knowledge.

All that the O-rings do, is keep oil that happens to land on top of the retainer, from being able to run down the valve stem. You're supposed to put the valve in, then the spring on, then compress the spring, then put the retainer on, then slip the little O-ring on, then put the keepers on, then take off the compressor. The O-ring gets caught between the retainer and the bottom of the keeper and seals the retainer to the valve stem. Pretty useless in the grand scheme of things.

Best thing to do, is go mic your guides; get the numbers; and buy the right seals for what you find. All this about "what they supplied" is not doing a whole lot of good... as far as you or I can see.

If the seals fit tightly around your guides then I'd say they are probably alright, If it is the seals then you will notice a lot of blue smoke when it is first started after setting all night. Leaking guides seem to show major oil burning after setting for awhile. Get your carb dialed in, sounds like your idle circuit may be way rich. A high vacume condition will pull on the idle circuit, don't the Demon carbs have adjustable air bleeds? Where are your idle mixture screws adjusted at now- 1 1/2 turns out? Bob

dont get smoke at startup or at idle just cruising at 2500-3000 r's and real bad when i take it up to 6500-6800 then let off the car fills with smoke wierd smell not just like fuel but also oil mixed..when i get in the car after being parked for a while it almost smells like burnt wood.could this problem be down below.rings not seated(have some blowby).high volume pump
pushing oil??did a comp test had 160 across the board left each one for 5 min,not a single one leaked down(did it dry).you guys have any more suggestions before i take it out and have my way with it...apparently it didnt work the first time!!i'm not claiming to be an engine guru but i have built a few and was very happy with my success but this is the first set of heads i assembled on my own checked installed height,spring pressure and bind.thought the seals just slipped on over that piece of straw.took the valve covers off last night and from what i can see the seals are still intact on the guide.any other suggestions please help...
shane

I had a similar problem when I put together my 350 with AFR heads and an Edelbrock Performer RPM manifold. I KNEW that the valve guide seals weren't bad (AFR uses really top-notch stuff) but I checked them anyway and they were OK.

It turned out that the intake manifold was WARPED (it was a new one!) and when compounded by the fact that the heads had been decked by AFR for extra compression (although they did also deck the intake side to compensate) it cause major oil suckage ;) from the underside of the manifold where it mates with the head.

I had the manifold machined to match the heads and no more oil usage.

I wonder how often stuff like this happens - a new Edelbrock intake that is warped!

BOD

bod,did you have the same symptoms???
shane

Same symptoms. Did you remove the intake manifold when you changed carbs? If you did, were you VERY carefully with the torquing sequence when you reinstalled it? Did you use thick gaskets and use silicone to seal around each port?

SBC's are apparently known to be sensitive to properly seated intake manifolds, or they will suck oil into the intake ports upon deceleration and at high speeds.

BOD

all the intakes i've ever done never had a problem maybe a first for this.you use sealant around each port i only seal water inlets..
shane