GM Base marine 502 Valve question.
 

Do these motors come with Inconel valves? I'm thinking of buying one from www.1800runsnew.com for 5800, but want to make sure its a good motor. Does mercruiser use Inconel valves in there 502 415hp

Merc does not use innconnel valves in any black engines.

Not even in the Mag 502 or 454?? So i shouldnt be worried about droping one of the these GM Base motors in as long as I run it stock and no mods without changing to Inconel valves.

I just want to have a super relieable motor.

Are the GM Base motors the exact the same as a Merc long block.

I just want to make sure this is a good motor.

I've installed quite a few of these motors from 800 runs new. Infact a friend just got one last week. It's new not a re-man. They are a good deal, never an issue.

Kurt

Hello,
I bought Brand new GM long Block from 1800runsnew last year and disassembled it down to a short block and yes they do use the best parts GM performance sells. They do use stainless intake and Inconel exhaust valves

Here are the specs on the cylinder Heads
http://www.crateenginedepot.com/stor...-P1063C50.aspx

The intake valves are stainless part # 14097045 2.19in Intake Valve
The exhaust valves are a GM Inconel part#14097049 1.88in Exhaust Valve
Timing chain
http://www.crateenginedepot.com/stor...3-P244C28.aspx

Crank shaft part# 10114186 Crankshaft Gen. V & Gen VI (1053 Steel) 10114186
http://www.crateenginedepot.com/stor...6-P109C27.aspx

Piston ring pack is a JE700 piston This 502 standard, pressed pin, high performance piston has a 8.75:1 compression ratio. Use with all 502, 8.2L engines (compression base on 199cc head). Note included with this piston is ring package PN 12524293
http://www.crateenginedepot.com/stor...07-P93C26.aspx

Rods 7/16

http://www.crateenginedepot.com/stor...2-P103C26.aspx

I reworked the heads and I drilled out the heads for 7/16 /7 16 arp studs NOT the 3/8 to 7/16 studs. Installed new springs , heavy duty 10 deg retainers and locks felpro 1075 mls head gaskets and arp head bolts gm performance roller rockers Bigger camshaft 228 /238@50
http://www.crateenginedepot.com/stor...3-P135C25.aspx

Wow, thanks for all the info! Nobody has been able to tell me if the GM motors have inconel valvess, most say no, and say all black mercruiser motors dont have them unless its a Mercury racing motor.

How did you tell that the ones in your motor were inconell, can you tell when you disasemble the heads?

Ok now im confused....gm part # 14097049 doesnt say anything about being inconel?? It looks like its the same valve they use in the 502 car and truck motors. I googled that part number and nothing about marine came up.....

I wish GM have a break down of internal components in there Marine motor this would be alot better.

They dot even list a 502 on the GM Marine web site, just the new 6.0 and 496 new generation stuff. I looked for a phone number to call gm but nothing is listed for the marine division.

mrfixxal
 

This seems like a better deal...


http://saltlakecity.craigslist.org/pts/1433234640.html

Im in salt so , aluminum heads are out, also cams different, intake...to much to convert.

You really don't need inconel exhaust valves in stock 415hp engine anyway.

That part number may very well be an inconel valve. They are $49 each at Pace Perf and that is about the same cost as Manly extreme duty/inconel valves. Pace lists the part number with an F in front of it, so it could even be a Ferrea valve.

Actually the exhaust valve that is in those heads (1800runsnew) and in the Merc black engines ( 454/502 Mag) is a 2 piece valve. It is welded in the middle of the stem. It has a stainless stem and an Inconel head. Next time you have one out of the head, put a magnet to it. Inconel is not magnetic and the stainless is. If you run the magnet up the stem starting at the head, all of a sudden it will stick to the stem. :drink:
Eddie

I had no idea. Once again Eddie teaches me something new:D I thought they just ran GM SS valves in black engines and use inconel in Merc Racing stuff.

I found it purely accidental. Those valves are susceptable to breaking at the weld, so I started looking at one to try to figure out what it is made from and why they broke in the same spot. I had a magnet on the workbench one day and it stuck to the valve stem. I was playing around a little later and realized it wouldn't stick to the head. Then I figured out that it is a two piece. It is crazy that you can not tell where it is welded without the magnet. There is absolutely no line what so ever. Whoever does it does a fantastic job. It is actually a good money saver. If they could figure out how to make it stronger, it would be a great alternative to the expensive, heavy Inconel valves. There is no need to have an Inconel stem....only the head. I'm sure they save a small fortune on the valves by doing it this way since the Inconel is over twice the cost of the SS.
Eddie

Make sure you change the bypass valve in your oil filter head or you'll be looking at trouble. Just some FYI

:party-smiley-004:


You better call on the price, everyone else is getting $6,700 to $6,900 for the exact same engine assuming this is a true Merc engine.

I did call, 5795. check out the site..www.1800runsnew.com its the same that everybody sells GM BASE MARINE 502

Can u tell me more about this?? It the oiling system routed differently or what?? thanks. I wish there was a How too for 454 to 502 swaps, i thought everything was just a swap over.

If you are running a gen 5 or 6 there are two bypass valves installed in the engine block one for the filter bypass and the other one is for the gm factory remote oil cooler witch is up inside the block where the threads for the remote adapter would bolt up to the block remove the one in the middle. where the adapter is and the one offset needs to be changed to a 30 psi or plugged so all the oil will go throught the filter and cooler.
Dont run the engine untill you have the right bypass valve or you will be removing the engine due to you buring it up like a lot of other guys have done. I spent a lot of research on my set up with the right bypass valve install I'm only running a filter on the block and I'm motioring the oil temp then going from there run a good filter like napa 1061 wix do not run fram they are junk.
Do a search here on bypass valves if you would like to talk to me about the whole set up give me a call @ 734 383-0730 ask for Dale

Back to the valves.
I just took a valve out of a head and the magnet only stuck on the TIP. Do you need a super strong magnet? I just used a telescopic one used to things you drop in hard to get places.

Yes I did check out the website. The prices seems to good to be true. I am in the market for two.

They are the best gm performance parts you can buy. I have one I would gladly send you pic's of the engine in parts whats your e-mail?

I did talk with the guy there for 30 mins, i asked him his name and he said they call me the old guy!! He said price is good for now but is only going up, so buy sooner than later, after the 1st im sure it will go up to 6000 if i had to bet

Here is the same engine
http://cgi.ebay.com/ebaymotors/8-2L-...item56365be1db

http://www.cpperformance.com/detail.aspx?ID=3511

They all have the same pictures!

Here is shipping desc. 355lbs sounds a little on the light side.

Engine weighs 355lbs fully packaged and crated.
Shipping $180-$350 depending on location of
delivery, to be paid by winning bidder

The valve stem is more than likely 4140 steel. Friction welded or stun welded to the inconel head. Stainless wouldnt work well in a valve guide because its a softer material. The 300 series stainless isnt magnetic. It has very little carbon. The 400 series stainless has some carbon so a magnet will stick and its a little stronger. But its still a softer weaker material than carbon steels. Just a little machine shop info from a friendly machinest. Bobby

Didn't they offer a 540 and 600+ big blocks? I don't see them mentioned on their site. Doug

when i talked to them the other day , he said he lost his engine builder so he's not doing them anymore for the time being.

So when i remove all the stuff from my old 502 mag for my new 502 mag what excectaly do i need to take out for valves? Where is the one by block filter boss, is it in the middle of threads, how do i remove it?, im going to reuse the 502 remote filter so i should be god there, but i just need to know that i have all the stuff i need before i sell my old 502.

Ok, here's the deal I ended up with and info I found out, GM marine engines carry NO warranty from GM, any warranty is from whoever you purchase from, and that could become a joke as I found out when I had a issue on a pair of new GM 454 marine engines. if I had it to do over again I would have bought GM crate engines from GM performance parts, made the changes to marine use, and as long as you have a vin # you can use you get a 3 year warranty from GM. Rob

I'm just taking my old 2000 502 mag apart, stripping it to swap everything to the new 502, i looked in the old 502 and can see a bypass valve in the center of the oil filter boss and also right beside it. So why would i want to plug the offset one and remove the center one if my 502 has one now and i will be useing all the stock fremote filter and oil cooler??? I' m not really clear on the whole oil bypass set up that i need. I havent picked up the new 502 from 1800runsnew but im not sure if it even comes with bypass vales installed and if they are the right ones. How do i tell with out removing the pressed in valves.

Read all this about the problems.
http://www.offshoreonly.com/forums/g...-hardware.html

I did read all about it, still alittle unclear. The way my stock motor is the 502 mag 415hp is that it has one bypass in the center and one offset, so when i get my new marine base 502 should i duplicate the same set up as i have or do i change the offset bypass to a 30psi, remove the center? I want to make sure i dont fry my new motor. My motor will be bone stock, just a merlin intake, 800cfm carb and EMI headers, internal all stock.

What does the 2000 502 mercruiser come with for bypass valves stock, I can see two but what pressure are they? Can i just order them from merc and dubplicate what i allready have....

Gen V and Gen VI big-block engines come with two oil pressure bypass valves installed in the engine blocks. Both of these valves are rated at 11 psi pressure differential. One valve is for the oil filter and the other is for the production oil cooler. If you install an aftermarket oil cooler or remote oil filter that attaches to the oil filter pad on the engine block, you should be aware that you need to change the oil filter bypass valve in the engine block. The aftermarket oil lines add resistance which will cause the bypass valve to bypass the aftermarket oil cooler and/or oil filter all the time. Obviously, if the cooler and filter are bypassed the oil will be dirty and hot. Your engine could run hotter and could be damaged by dirt in the oil. If you choose to use an aftermarket cooler or remote oil filter that attaches to the pad, you should change the bypass valve to one with a higher differential pressure rating. A good choice would be GM# 25161284 which is rated at 30 psi. Remove the valve that is closest to the crankshaft and replace it with the new valve. Press the new valve into the engine block and stake it in three places. You should note that the bypass valves don't need to be changed if you use a production oil cooler which uses the production holes in the engine block and you don't use a remote oil filter. Also, if you use an adapter that just angles the filter for clearance you don't need to change the bypass valves.

I am running the stock oil cooler and the stock remote oil fiter setup that came with the 502 mag from merc. So when i get my 502 marine base motor it will come with 11psi vales in both the center hole and the off set one in the ol filer boss on block.......So if i run all the stock stuff that o took off my old 502 i ned to change the new outer bypass valve to a 30psi and then do i just leave the 11psi one in the center that the new block came with? I wont be using an afternarket oil cooler or remote filter, I will be useing the factory merc coooler and remote filter sysyem.

My old 502 i took out has 2 bypass valves in it, and i know that it worked great, what are they in my old motor. The motor has never been apart, so what does Mercruiser use for outer bypass valves and for the center one too???? I just want to duplicate my oild system.