[ss3966]

Starting up a rebuilt 496 and can either swap an old oil filter adapter off the orginal 350, or use an adapter without a bypass available at the local speedshop. The fellow there said bypasses are used for street vechicles that likely will go over the recommended mileages between oil changes, and that performance vehicles paid closer attention to don't need them.

The oil is changed every 3-4 weeks depending on how much bracket racing is done and do drive to the track. Of couse there is the start-up itself, complete with moly on the cam and lifters, Comp Cams cam protector in the oil, Clevitte 77 red bearing protector, and GM EOS on the rings to consider also. Should I discard the oil-filter bypass unit for my application?

 

[GuysMonteSS]

I've just finished rebuilding my big block,(468),and I plugged the bypass,I think its a good idea.But I will let the engine warm up a bit first.
Guy

 

[wotr]

Same here, plugged bypass,, also filters have a bypass, I get one from napa that does not have a bypass, just warm her up before reving it. LJ

 

[upstand2]

plugged= 10psi more on my sbc.

 

[BillsCamino]

Bypass plugged here...motor was recently dis-assembled. Looks brand new!! :thumbsup:

 

[ericrickster]

just as a note on the gm oil filter adapters

they can and do crack,somewhat rare,but it does happen

moroso,jegs,summit all make a billet adapter that does not have a bypass

also,a high burst strength oil filter such as k&n is manditory with no bypass

just in case you do forget and rev the motor before oil temps are up

 

[BillsCamino]

moroso,jegs,summit all make a billet adapter that does not have a bypass

also,a high burst strength oil filter such as k&n is manditory with no bypass

Correct! :yes:
I failed to mention this...using the Moroso filter adapter and K&N 3002 filters.
Re-using the same pistons, crank is perfect!. It even looking like the same bearings could have been re-used.
And this motor hasn't been babied.

 

[fabio]

Same here, plugged bypass,, also filters have a bypass, I get one from napa that does not have a bypass, just warm her up before reving it. LJ

do you know the part #?

 

[wotr]

Fabio,, I will get the number tomorrow.

Eric,, I read about one person saying he had an adapter crack. I have never seen one crack, have you? GM has built millions of them,, just wondering what the odds are. I run a $3.00 napa filter, 80 psi at idle, 60 psi hot,, I have experimented on several occasions by reving to 5000 rpms when cold and pegging the needle. Then I pull the filter and inspect it,, I have never found a problem with my filters. Of course I am not advising people to do what I do,, sometimes expensive things are better and sometimes they are not needed.. LJ

 

[dgrobels]

I would def use it

 

[ericrickster]

wotr,there is a recent post over at www.speedtalk.com that covers the oil filter adapter breakage,i never heard of it before this post.

http://speedtalk.com/forum/viewtopic.php?t=10368

wayyyy too many stories of people that have seen it first hand,ain't worth the risk for me

the moroso piece is a $30 item

 

[wotr]

I am well aware of speedtalk and the thread you speak of. Most parts that break do so because of abuse or mishandling in stock type situations. Not wayyyy enough stories to change my mind on the adaptors for most chevelle enthusiasts. Your car is not your average car, $30 is a very small percentage of the money in your engine. I don't pay much attention to stories,, judges call it "hearsay", unproven facts are also referred to as "opinions". If I had your car I would feel safe with a stock adaptor and a NAPA[wix] filter.,,, no bypass of course,,,, LJ

 

[ss3966]

If I follow, then to use an adapter without a bypass - the filter must have its own bypass valve within it. This would mean I buy a filter with a bypass valve in it each time and throw it away. The instructions for the Perma-Cool filter adapter I bought at the speed shop say it requires a filter with built-in bypass valve.

I asked a counterperson at Carquest, and they didn't know of a filter with a bypass valve in it, and spent some time in the filter catalog looking for any with a bypass valve. Would this mean I'm now tied to a more expensive, harder to find K&N filter? Easy parts availablility is a plus and I flogged my LS-6 crate motor for 15 years with standard bypass before starting to bracket race, but I'm sure we can all cite similar usage experiences. I don't really want to buy a bypass valve to throw it away with each oil change without a very good reason.

The long-timers who have only seen two break over 40 or so years imply that its very rare, and probably from overtightening.

 

[fabio]

ss3966, no a standard filter is ok. Just try to allow the engine to get up to temp before hammering the engine.

 

[Wolfplace]

If I follow, then to use an adapter without a bypass - the filter must have its own bypass valve within it. This would mean I buy a filter with a bypass valve in it each time and throw it away. The instructions for the Perma-Cool filter adapter I bought at the speed shop say it requires a filter with built-in bypass valve.

I asked a counterperson at Carquest, and they didn't know of a filter with a bypass valve in it, and spent some time in the filter catalog looking for any with a bypass valve. Would this mean I'm now tied to a more expensive, harder to find K&N filter? Easy parts availablility is a plus and I flogged my LS-6 crate motor for 15 years with standard bypass before starting to bracket race, but I'm sure we can all cite similar usage experiences. I don't really want to buy a bypass valve to throw it away with each oil change without a very good reason.

The long-timers who have only seen two break over 40 or so years imply that its very rare, and probably from overtightening.

=
Almost every filter you buy has a built in bypass with a few exceptions & these are some of the performance filters
I almost always block the bypass, have for the last 30+ years
I do not like running dirty oil through my engines
The factory bypass has a spring that bypasses at a differential pressure of about 5-8lbs
This means it is open most of the time
The bypass in the Wix HP filters is in the 20lb range which means it is not open most of the time, fact is it is rarely open
I cannot tell you at what pressure most filters bypass at but my sense is from all of the ones I have cut up it is quite a bit higher than the factory GM bypass

To each his own but my preference is to either plug the bypass or at least find one that has about double the spring of the stock GM one.

 

[Ron454]

I've seen the stock bypass stick open!
The little disc somehow got sideways.
Took the bearings out in a few thousand miles, none of the oil was being filtered.

A good reason to block it!

Ron

 

[wildman926]

Cheapest one I have found HERE and HERE.

Got to get one.....

 

[ss3966]

How can I tell if a filter has a bypass in it? The instructions for the Perma-Cool adapter say the filter used must have its own bypass and this is in bold, underlined, and with exclamation points so they're probably serious. I usually use the Carquest premium 85060 filter.

But then the Carquest countertop cowboy looked it up and couldn't tell if it did or not. I hate to turn something usually not even considered into a big issue.

 

[wildman926]

If you do a search like HERE, select one of the filters and you will see if it has a bypass in it or not.

As Mike Lewis stated, most all have them.