Thanks for all the GOOD info. Lash, I am sorry but there are NOT three dials. I checked again this AM and it only has TWO. And yes I did read the article. Jr....I don't have the delphi sticker. I guess this means I must have the Dorman intake? Any other thoughts on this? Thanks again for all the help!! Chad

PS: Are the Dorman intakes the best out there? When should I be looking at replacing??

Sorry if I gave you a bum lead on the date stamps. I was NOT aware that the Dorman only used year and month.

Anyway, based on that info, you had yours replaced in 2004. As far as how often to replace there are at least two schools of thought. One says to be safe and replace every 60,000 just in case, the other says to keep a good eye on your coolant use and your engine and it will tell you when it'* time.

On the other hand, I don't know if we have any good record of failure on the Dorman intakes yet (if any). They are definitely stronger with more meat at the failure area and more air gap around the EGR tube. I would guess that jr's3800 and or willwren know the most about this aspect.

I believe the EGR bore diameter (ID) on the Dorman is the same as the Rochester or Delphi - just a little over .750". The new Dorman kit comes with a reduced diameter stovepipe (.510 pipe, .624 base) that will provide a .125 air gap for 99+ engines. If the stock 99+ GM pipe is re-used, the gap is about .065.

For folks with 95-99 engines, and a stock .750" stovepipe, the gap is just a few thousandths. That is why we recommend a reduced diameter stovepipe - to get some space between the hot pipe and the plastic. I also recommend reaming the bore for a 7/8" sleeve so you won't have to do the job again.

Radchad, Bob Dillon will sell you a sleeved upper. I will sell you a reduced diameter stovepipe for $10. If you want to sleeve your own upper as shown in the link above, I will sell you a sleeve for $5.

Lash, or Don, please correct me if I'm wrong on that Dorman EGR bore size.

As far as I know, you are correct and I wasn't careful enough with my post. I should have stated the whole detail as you have above. I meant that the net result of a Dorman kit install is a larger air gap.

Thanks for clearing that up for me, Bill.

Thanks everyone for their help, this is great info!! No problem Lash about the info....I just kept wondering where else to look!!! So is it safe to say, I can wait several years and then do the Bob Dilion mod/UIM? I watch my coolant level fairly closely! Thanks again for everyone'* input!! Chad

I would think yes.

So when these things go, is it an obvious decrease in coolant level. I notice small fluctuations in the coolant level as it is. Do you just check the level at the same time, all the time, ie. when first starting or after enigine is up to running temp? Thanks again!! Chad