GM Crate Motor - 502 Ram Jet ??

[Party Cat]

gnarley:
Why did he say to change the valves??? & Replace them with what??? Stainless? Titanium???Crate motors generally have regular valves. Marine ones should have either severe duty or Inconell valves.

[KC]

"Inconell" That is it! That is what Teague mentioned in the article... the motor has Stainless Steel vales from the crate, I guess it depends upon how you drive the motor.
KC

[KC]

Two items..... Tech Specs and some infor on using external oil coolers...
Ram Jet 502 Technical Information
Horsepower .......................................510 @ 5500 RPM
Torque .................................................5 50 Ft Lbs @ 4500 RPM
Maximum Recommended RPM .....5800
Compression Ratio ............................9.6:1
Block .................................................. ..10237292 - Cast Iron 4-Bolt Mains
Crankshaft ..........................................10183723 - Forged Steel
Connecting Rods ..............................10198922 - Forged Steel
Shot Peened, 7/16" Bolts
Pistons .................................................. 12533507 - Forged Aluminum
Piston Rings ........................................12524293
Camshaft .............................................12336 543 - Hydraulic Roller
Lift: .527" Intake, .544" Exhaust
Camshaft Duration @ .050" .............224° Intake, 234° Exhaust
Timing Chain .......................................3891519 - Single Roller
Cylinder Heads ...................................12363390 - Aluminum Oval Port
110cc Combustion Chambers
Intake Valves ......................................12366987 - 2.25" Stainless Steel
Exhaust Valves ...................................12366988 - 1.88" Stainless Steel
Valve Springs ......................................12462970
Rocker Arms ........................................12523976 - 1.7:1 Ratio
Distributor....................................... ...... HEI
Valve Lash ............................................Zero
Fuel .................................................. ......92 Octane
Spark Plug ........................................... 25164642 Rapid Fire
Ignition Timing ....................................8° @ 800 RPM
36° Total @ 5000 RPM
Tech Tip
"Oil Filter & Oil Cooler Bypass Valves"
Excerpt from Speed Reading, written by Wade Hajek of GM Performance Parts
Gen V and Gen VI big-block crate 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.

[230Stingray]

Hey Fat Rat, do you know what cam your friends put in there 502/502 I might do something like that over the winter. It would be interesting to see how 3 seasons of use have treated the inside of this motor anyway.

[gnarley]

KC:
"Inconell" That is it! That is what Teague mentioned in the article...KCAnyone care to explain what is the difference or what is so good about the inconell valves??? I have heard of them but never used them.

[grog]

It's all about heat and strength... I looked it up in the Manley catalog... look at page 5.
http://www.manleyperformance.com/Manley2002Catalog.pdf
Hope this helps,
g

[KC]

Thanks grog... That does help!

[KC]

I've decide....
Measuring the engine bay on Friday night and if clearance allows, ordering the 502 Ram Jet on Monday.....
Should make a great winter project.
KC