I have had my 75 since about 38 years!!!
I changed to a 502 HO 440 hp BB in 1995. I`ve never looked inside the engine. No problems after ca. 40.000 miles. Oil is Castrol edge, synthetic 10W- 60. Drive often high speed on german"Autobahn", up to 155 mph...
I bought the engine with a flat tappet cam. Gen.V. 91-95 must be flat tappet. A friend of mine did`t agree and sad, it must be "roller cam "inside.
Can some one help me to identify my motor by engine vin and casting numbers? Any information about the early 90th mark V?
Casting nr: 14096859
Vin: 1J27XXW4
Regards from Hamburg/ Germany, Kalle

 

The gen-5 is a flat tappet. The gen-6 is the factory roller set-up. 96-00 and newer with over-counter 502 HO and ZZ502 engines. Pull a valve cover and shine a flashlight down a pushrod hole and you will see that there is no retainer on top of the lifter.

 

this is the retainer you would see sitting on top of the lifter and you would see two flats machine to the size of the lifter to go through the hole. https://www.ebay.com/itm/454-502-GEN...kAAOSwV-Nbr5Xr

 

The VIN you provided, 1J27XXW4, does not make sense. The 1 is United States, the second character should be a G not a J, and the third character 2 is Pontiac.

 

This is a counter engine, not a vehicle vin. I am sure no 502 ever left the factory in a vehicle with a road legal title.

 

if you mean a 502 HO 450 HP not 440 HP below is from the GM Performance Parts Catalog 2011
part number: 12568778
engine type: Chevy Big-Block V-8
Displacement (cu in): 502
Bore x stroke (in): 4.470 x 4.000
Block (p/n 19170540): Cast-iron with 4-bolt main caps
crankshaft (p/n 10183723): Forged steel
connecting rods (p/n 19170198): Forged steel, shot peened
pistons (p/n 12533507): Forged aluminum

With 450 horsepower and 550 lb.-ft. of torque, our 502 HO crate engine
has power on tap for every need – whether it’s a ’69 Chevelle at the
drag strip or the Suburban that towed it there!
The 502 HO is all about torque. It hovers just below the 500 lb.-ft. mark
at only 1,500 rpm and arcs gently above the 500 lb.-ft. level by 2,800
rpm, remaining there through 4,200 rpm. All those axle-twisting lb.-ft.
are rooted in a stronger, updated four-bolt cylinder block that houses
a forged steel crankshaft, forged and shot-peened rods and forged
aluminum pistons. In other words, it’s a super-stout assembly that is
as durable as it is powerful.
Iron, rectangular-port cylinder heads keep the 502 HO affordable
and our crate engine assembly includes an aluminum, dual-plane
intake manifold, a water pump, 14-inch fl explate, balancer and more.
You add the carburetor, starter and ignition system – all available at
camshaft type (p/n 24502611): Hydraulic roller
camshaft lift (in): .510 intake / .540 exhaust
camshaft Duration (@.050 in): 211° intake / 230° exhaust
cylinder Heads (p/n 12562920): Iron rectangular port; 118cc chambers
Valve size (in): 2.190 intake / 1.880 exhaust
compression ratio: 8.75:1
rocker arms (p/n 12523976): Stamped steel
rocker arm ratio: 1.7:1
water pump (p/n 19168606): Cast-iron, long-style
flexplate (p/n 10185034): 14"
recommended fuel: 92 octane
ignition timing: Base 8° BTDC, 30° Total
maximum recommended rpm: 5,500
Balanced: External

 

So jealous!!!

 

Thank you for your answers!
As I wrote I bought my 502 HO gen V in 1995. The 440 hp was maybe the rating for the first HOs? I thought the roller cams came first with the VI 1996.
My distributor has no melonised gear. Until now I have had no problems at all. Seems a little bit difficult to identify my engine...
Greetings from Germany, Kalle

 

what tires?
150+ mph needs some good ones

 

My tires are Goodrich, 255/50 16 on 9,5 " ZR c4 whees.(with adaptors from Eckler`s)

 

Did you buy the engine new, if so, do you have anything with the part number?

 

Yes, I bought it new. No, I`ve nothing from that time. (24 years ago...) Only the numbers I`ve wrote. but now im sure, that all 502s/454s gen V from 91-95 were flat tappet engines. Anyway, its a very relayable, strong Motor. No Problems with full synthetic oil.

 

Kinda says something positive about synthetic oil, doesn't it?

 

If used from the beginning in an all new engine? I did it. As I said: No problems at all, good oilpressure, about 4psi at idle and 5.5 at higher rpms.(engine warm)

 

I googled the block casting number and it is definitely a 91-95 flat tappet engine. My gen 6 502 is a different number. 10237300.

 

I hope you mean 40 PSI not 4?

 

If the OP is from Germany, the oil pressure (4 to 5.5 N/m2) could be in 27.5 to 37.9 psi

Just sayin'...

GUSTO

 

Sure, 40 PSI on my original corvette meter.