Help Identify This Replacement SBC

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First post.

Finally bought myself a money pit😄 1972 GMC 1500 Super Custom 350/350.

I'm looking for some help identifying this motor. The suffix does not show up on any of the websites like nastyz28.

Thanks in advance.

[67 chevelle]

GOODWRENCH replacement motor

[Hotcorner]

Well, yes. But any ideas about the specs? I know it was made in Flynt. Beyond that, don't know. 2 or 4 bolt? Original HP?

[B. W.]

because it's goodwrench engine, info on the stamped #s may be limited. You might want to pull the casting #s & try those. Anyway, looks like a base 350, specs somewhere around 200 HP.

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Originally Posted by B. W.

because it's goodwrench engine, info on the stamped #s may be limited. You might want to pull the casting #s & try those. Anyway, looks like a base 350, specs somewhere around 200 HP.

Will do before I spend any money on improving the performance.

Since I'm not burdened with keeping the engine original, was contemplating a limited budget performance bump with this as the foundation.

[Bishops Trucks]

Here's a link I found. This is for a stock GM Crate motor. : http://www.jegs.com/p/Chevrolet-Perf...52506/10002/-1

Specifications •4-bolt main with 2-piece rear main seal
•Nodular iron crankshaft
•4.000" bore x 3.480" stroke
•Internal balance
•LT1/LT4 powdered metal connecting rods
•Cast aluminum pistons (dished)
•8.5:1 compression ratio
•Hydraulic flat tappet cam (.383"/.401" Lift, 194 / 202 Duration @ .050", and 112° lobe separation)
•Cast iron cylinder heads with 76cc chambers
•1.940" Intake / 1.500" Exhaust valves
•1.250" diameter valve springs
•1.5:1 ratio rocker arms
•3/8" pressed-in rocker studs
•Block is compatible with left or right side oil dipstick (Requires Plug for Unused Side - sold separately) - p/n 809-14091563 left side plug; or p/n 809-9421743 right side plug
•4-quart oil pan
•Oil pump, oil pump pickup and oil pump drive shaft installed
•Includes timing tabs for a 6-3/4" or an 8" balancer (balancer not included)
•Recommended spark plug: 14mm thread, .460" reach, 5/8" hex, tapered seat, projected tip (AC Delco p/n 065-R45TS, Autolite p/n 417-144)
•Requires p/n 809-19299222 or p/n 555-23605 Oil filter adapter (not included)

Hope this helps.
If this is the motor you have, it's a great foundation to start with.

[Hotcorner]

Hopefully, that's it. The blue paint makes me wonder if this was a crate motor or a warranty replacement. I had read that all GM crate motors are black. I suppose it could've been repainted, but why blue.

Many thanks.

[Tator]

Not a warranty engine. The suffix code would look different. There would be CE then 6? numbers.

That decodes as built in Flint, Oct. 30 and I would bet that the AJP is a late 1973 350-155hp 2 bolt main. Since it follows AJN. Gm used thousands of suffix codes in buses, boats, motorhomes, etc.

It would not surprise me if there are still some unknown.

Valve covers could be swapped. Check the casting number on the block and the date code if it is there by the oil filter housing.

I would go as far as to pull a valve cover and check the numbers on the head as well.

[Hotcorner]

Originally Posted by Tator

That decodes as built in Flint, Oct. 30 and I would bet that the AJP is a late 1973 350-155hp 2 bolt main. Since it follows AJN. Gm used thousands of suffix codes in buses, boats, motorhomes, etc.

I thought the same, but wasn't sure, i.e., a 1973 C60/Omega motor? That's starting to sound like a turd for a foundation.

[Tator]

I would back up and punt it. It would be as much work and possibly $$ to do a head/cam swap than to R&R a better foundation. If you are going for more hp/tq.

[Hotcorner]

Yes, I was thinking of heads, cam, headers, and an intake. Keep it simple and mild. 350 ish HP, but maybe this isn't the block to work from.

[67 chevelle]

The most telling tail will be the head casting number , dont think I would put a top end kit on one of those old goodwrench motors , especially if it has dished pistons . Id opt for an l31 long block and go from there . But thats just me .

[CUSTOM/10]

I would run the engine & head casting numbers and see what they come up as !

Being blue it very well could be a 305 !

[Hotcorner]

Originally Posted by CUSTOM/10

I would run the engine & head casting numbers and see what they come up as !

Being blue it very well could be a 305 !

Hush your mouth!

[Hotcorner]

I would note that all of the AJ_ motors are 350 ci.

[bruceman1968]

AJP = 1985, Truck, 350ci, 160hp, manual trans, 2bbl, LF-5 RPO code, VIN code A, 60 series, federal and California emissions.

[Hotcorner]

Originally Posted by bruceman1968

AJP = 1985, Truck, 350ci, 160hp, manual trans, 2bbl, LF-5 RPO code, VIN code A, 60 series, federal and California emissions.

Good information. I guess they slapped a 4bbl on it for the swap. Anyone known if the LF-5 RPO motor is 4-bolt?

[demian5]

http://www.mortec.com