[76 elco]

I heard that chevy truck motors from 2000 and older came with forged crank and rods is that true???? or did just certain aplications come with forged parts???

[35WINDOW]

Which Engine are you asking about?

[76 elco]

Originally Posted by 35WINDOW

Which Engine are you asking about?

well the info that i got said truck motors specifically small blocks

[oldbogie]

Originally Posted by 76 elco

I heard that chevy truck motors from 2000 and older came with forged crank and rods is that true???? or did just certain aplications come with forged parts???

A definite "maybe", you can't tell for sure till you open them up. General rule is that half tons might or might not have forged cranks and 4 bolt blocks. Three quarter tons usually, but not always do. One tons and up always do.

Bogie

[Mustangsaly]

I know some 1970 to 1980 C50 C60 chevy trucks with factory 350s had steel cranks. some school buses in them years had 350 steel crank motors. prob these yr and size trucks with big blocks could of had factory steel cranks too. I heard the 69 to 72 or 74 C10 chevy pickups had factory 4 bolt main 350s with steel cranks. but I have had several in them yrs and not on had a steeel crank. I haven't heard that about newer than late 70s trucks having steel cranks but they could of. back in the 80s we looked for the 70s to early 80s chevy P/Us and buses for builder SBC 4 bolt main motors. and them years for BBC builder motors too........

I like the GM steel Cranks in SBCs & BBCs, and I know GM made 350 1 piece rear main steel cranks, I heard there were in the high performace motors and in one ton and bigger trucks. and GM made BBC 1 piece rear main steel cranks too, but not sure what they put them in.

http://www.gmpartsdirect.com/perform...CATID=883.html

look here too
http://www.mortec.com/cranks.htm


Mustangsaly

[Hippie]

Originally Posted by Mustangsaly

I like the GM steel Cranks in SBCs & BBCs, and I know GM made 350 1 piece rear main steel cranks, I heard there were in the high performace motors and in one ton and bigger trucks.

I have a 350 out of a '96 1 ton, I bought it on that same assumption, got it home and opened it up and .............. 2 bolt mains and a cast crank . But hey, it was in good shape and a roller cam block and I didn't pay all that much so .

[automotive breath]

I have two in the shop, 350 4 bolt mains, 2 piece seal steel cranks with
X rods. One came out of a 1970 one ton, the other was a heavy duty
replacement crate engine for a dump truck. These make great race
engines if you can find one

[baddbob]

Automotive Breath, how much stronger are those x stamped rods than the olther stock rods? I have a few sets laying around and wondered if they are much better. Believe it or not there was x rods in a 262 I tore down. I've also seen them in 305 motors. Every 1/2 and 3/4 ton truck engine I've torn down had a cast crank-all of them.

76 elco, all chevy sb and bb rods were forged.

[automotive breath]

The X rods apper to have a thicker beam, that's all I know for sure. I read that
they are the strongest production SB rods made. When I use a pressed pin
piston I use the X rod and run them to 7500 RPM with out worry.

From what I read the PM rods aren't as strong as the older forged rods. I have
used them, I just keep the RPM down.

[Chevrolet4x4s]

does anyoune have aphoto showing a cast and a forged crank side by side
Shane

[oldbogie]

Originally Posted by Chevrolet4x4s

does anyoune have aphoto showing a cast and a forged crank side by side
Shane

I don't but there's a couple instant give-aways when looking at the real thing. Probably the most apparent is the parting line. A casting has a narrow, well defined line where the mold haves join. A forging has a wide, smudged line where the dies crash together.

The surface is often different; a casting has a smooth lightly grained surface; a forging is often grainy, twisted and rough by comparison.

Bogie

[302 Z28]

You can also tell them by standing them on their flange and tapping them with a metal object. The forged crank will have a sharp ring, the cast crank will have a dull thud. The flange on a cast crank is also bigger when compared to the flange of a forged crank.

Vince

[11echo]

Here is a pic. of a forged steel crank. If you'll look at the seam line it will be "thick" about 1/2" wide or so. A cast crank has a real narrow seam line NOT wider then 3/16" or so. I tried to show a dimension line in this pic. to know where to look and approx. how thick/wide it is (think I got it a bit too wide) bit this should give you some idea where and how wide to look for. Good Luck!

[Mustangsaly]

I have two 350cid GM 3.48" stroke 1 piece rear main forged crank shafts #14088532 I'm not sure what they are out of. I just bought the cranks. I have over the yrs had several 350 GM 1182 crank shafts. here in the future for a couple upcoming projects I want to use a 96 or newer 350 4bolt main Vortec roller block, with a forged GM crank I have, and forged I beams or some H beam rods and forged pistons, with a roller cam and be set for some nitrous. I won't have much in the block, crank or rods. so it will be a cheaper build price wize I hope.........



SBC ONE PIECE REAR MAIN OIL SEAL
14088532...350.......forged..medium journal...3.48" stroke


SBC TWO PIECE REAR MAIN OIL SEALS
3941182....350.......forged..medium journal...3.48" stroke

[Mustangsaly]

Originally Posted by 11echo

Here is a pic. of a forged steel crank. If you'll look at the seam line it will be "thick" about 1/2" wide or so. A cast crank has a real narrow seam line NOT wider then 3/16" or so. I tried to show a dimension line in this pic. to know where to look and approx. how thick/wide it is (think I got it a bit too wide) bit this should give you some idea where and how wide to look for. Good Luck!

what is the crank in the pic ? GM Big Block Crank ? Aftermarket Big Block Crank ? GM Small Block Crank ? Aftermarket Small Block Crank ? one or two piece rear seal ?