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Topic Review (Newest First)
04-06-2013 09:11 PM
matt2491 Boy that sounds pretty good to me! #283 it'll be! Thanks for all the input guys!
04-05-2013 09:58 AM
Hogg These engines are exactly the same save for the center 3 mains being 4 bolts on the 283 engine.

These engines are the basis of the 350HO 330hp crate, they just take these longblocks, strip out the roller cam, pushrods, roller lifters and drop in a 212║/222║ flat tappet cam and add a Vortec carb intake.

These are also teh basis for the Ramjet 350. They remove the stock 191║/196║ 0.412/0.428" 111║ LSA roller cam, add the HT 383/Ramjet 350/Marine roller cam that has 196║/206║ 0.413"0.451" 109║LSA roller cam, add 1.6:1 roller rockers, and throw on the Ramjet fuel injection.

The 282 and 283 L31's have nodular iron cranks, frged PM rods and hypereutectic pistons topped off with the highest flowing production GEN 1 heads GM ever installed on a production vehicle.

these engines are rated at 255 sae net hp@4600rpm/330 sae net lb/ft torque @ 2800rpm, but actually output around 310 gross hp.

1/2 and 3/4 ton vehicles that had under 8600gvrw got the 2 bolt L31, and 3/4 ton and 1 ton vehicles with over 8600gvrw rating got the 4 bolt.

There is also a 3rd L31 variant p/n 12569010, it has 4 bolt mains and lists at $4600, can be had for $3809. Its almost twice teh price of either the 2 blt and 4 bolt L31 engines. Its used in the W4500 trucks. Because of the price I wonder what goodies it has inside?

For the money you might as well get the 293 with the 4 bolt mains. These engines also come with a small windage tray as well.

04-05-2013 03:36 AM
75gmck25 GM sells these engine as emissions-approved OEM replacements that also have a GM warranty. It appears that to keep in line with emissions regs they need to sell a slightly different engine for HD than for the standard 1/2 ton. However, in your case either engine should work fine unless you have to provide proof of emissions compatibility for some reason (not likely for your '64).

I used one of the older style SBC 350 crate engines for my '75 truck since it was a direct replacement, and it works fine. However, I think this newer engine design with Vortec heads and a roller cam would have been a better choice as a starting point. The engine does not have the fittings for a mechanical fuel pump, and you need to use a Vortec intake manifold, but other than that they are a very simple swap.

04-04-2013 02:45 PM
Originally Posted by matt2491 View Post
Great. So there are no other differences like in the heads or valves or anything? If that's the case, then the 4-bolt is probably the one to go with huh?
yup.. the cam and everything are the same.. both 9.4 to 1
04-04-2013 10:17 AM
matt2491 Great. So there are no other differences like in the heads or valves or anything? If that's the case, then the 4-bolt is probably the one to go with huh?
04-04-2013 02:48 AM
gearheadslife part # ending in 3 is 4 bolt mains, part ending in #2 is 2 bolt.. only difference
04-03-2013 06:32 PM
Valkyrie5.7 Makes sense. The only difference between the light duty and heavy duty L31s was the head casting and whether it was two or four bolt main. I'd go with the 4-bolt only because if it's only $40 more it's no big deal now, but they're worth a lot more to most people if you ever want to get rid of it. I can't believe how crazy people get over a vanilla 4 bolt 350 sometimes.
04-03-2013 06:22 PM
GM Vortec Crate Engine Differences

I'm looking to put a replacement style GM truck engine in my '64 C10. Specifically, I am looking at their L31 type engines originally found in '96-00 Chevy full size trucks.

Does anyone know what the differences are between GM #12530282 and #12530283? They seem to be identical EXCEPT that #12530283 has 4-bolt mains. Are there any other differences? #12530282 is designated for 1/2 ton trucks while #12530283 is listed for 3/4 and 1 ton trucks with the "heavy duty option". This is all according to Pace Performance. Can't decide which to go with if the 4-bolt mains is the only difference. Hell, its only $40 more... but I wanna check with you guys first!

GM Goodwrench - 12530282 - 5.7L (L31-R) 1996-2000 Chevy/GMC Full Size Trucks, 1996-2002 "G" Van, Savannah,Express Vans - Under 8,600 GVW

GM Goodwrench - 12530283 - 5.7L (L31-R) 1996-2000 Chevy/GMC Full Size Trucks, 1996-2002 "G" Van, Savannah,Express Vans 1996-1999 "P" Vans- Over 8,600 GVW 96-00 CK2,3 G (L31) 99 P3 (5.7R) CPI HD

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