Are these rods forged?

« **on:** March 13, 2014, 07:09:43 PM »

Out of '84 454 hardin marine engine.
Rods have gm stamped on them along with the numbers 367 or 357 (not sure if its a 5 or 6 on those numbers)
Sorry the pics are blurry

Sent from my iPhone using SoCal Jet Boats

« **Reply #1 on:** March 13, 2014, 07:47:57 PM »

They look cast to me. Normally forged anything will have a thinner part I line. Cast normally will have a bigger grinf mark on them.

Sent from my SAMSUNG-SGH-I747 using SoCal Jet Boats mobile app

« **Reply #2 on:** March 13, 2014, 07:57:55 PM »

I think you mean the other way around casting leaves a very fine parting line from the mold forging leaves a thicker line that has to be ground off.

Sent from my SM-P600 using SoCal Jet Boats mobile app

« **Reply #3 on:** March 13, 2014, 08:03:14 PM »

Quote from: Beaveretriever on March 13, 2014, 07:47:57 PM

They look cast to me. Normally forged anything will have a thinner part I line. Cast normally will have a bigger grinf mark on them.

Sent from my SAMSUNG-SGH-I747 using SoCal Jet Boats mobile app

Actually that's backwards. Forged has a wide mark, while cast stuff has a thin line where the molds came together.

Also I'm pretty sure all gm rods were considered "forged" by definition, but I could be wrong. I'm sure someone else will chime in on this.

Sent from my iPhone using SoCalJetBoats

« **Reply #4 on:** March 13, 2014, 08:37:02 PM »

Oh you guys are right. I was writing that in class tonight. My mistake

Sent from my SAMSUNG-SGH-I747 using SoCal Jet Boats mobile app

« **Reply #5 on:** March 13, 2014, 10:05:17 PM »

So were you saying they look forged or cast? Tried to find info online but there is very little.

Sent from my iPhone using SoCal Jet Boats

« **Reply #6 on:** March 13, 2014, 11:06:06 PM »

I am pretty sure that all connecting rods were forged before the factories started going to the powdered metal process in the early nineties. Those are forged.

« **Reply #7 on:** March 14, 2014, 01:34:28 AM »

So are the factory forged rods not as good as the aftermarket stuff? I'm going to throw a 100-150 shot of spray on it, I'm buying forged pistons but I wasn't sure if the rods would hold but I guess since they're forged I should be ok?

Sent from my iPhone using SoCal Jet Boats

« **Reply #8 on:** March 14, 2014, 11:52:06 AM »

Quote from: Ckaz21 on March 14, 2014, 01:34:28 AM

So are the factory forged rods not as good as the aftermarket stuff? I'm going to throw a 100-150 shot of spray on it, I'm buying forged pistons but I wasn't sure if the rods would hold but I guess since they're forged I should be ok?

Sent from my iPhone using SoCal Jet Boats

Just make sure to use good bolts. That's the weak link IMO

Sent from my iPhone using SoCalJetBoats

« **Reply #9 on:** March 14, 2014, 03:00:41 PM »

Quote from: Jet Boat Maloney on March 14, 2014, 11:52:06 AM

Just make sure to use good bolts. That's the weak link IMO

Sent from my iPhone using SoCalJetBoats

yep at just a 100 or 150 shot stock rods are fine just have them rebuilt using good rod bolts

Sent from my SCH-I545 using SoCal Jet Boats mobile app

« **Reply #10 on:** March 14, 2014, 06:33:22 PM »

They are forged... they are the "truck" style rods, which are the better of the two (actually 3) versions of the 3/8 bolt stock rods. Resize with ARP bolts in them and they'll be plenty fine for a 150 shot...

matter of fact... with a good tune, I've thrown 275 at a set of beamed and shot peened 3/8 rods w/ARP "pro" bolts and they took it perfectly fine for dozens of bottles worth of passes. GM rods are really not as bad as people like to claim them to be... You'd be amazed at what you can reliably build with on a nicely built/machined 2 bolt studded, balanced cast crank, 3/8 ARP bolt rod, bottom end.

« **Reply #11 on:** March 14, 2014, 07:42:31 PM »

Quote from: Six-Oh-Nine on March 14, 2014, 06:33:22 PM

They are forged... they are the "truck" style rods, which are the better of the two (actually 3) versions of the 3/8 bolt stock rods. Resize with ARP bolts in them and they'll be plenty fine for a 150 shot...

matter of fact... with a good tune, I've thrown 275 at a set of beamed and shot peened 3/8 rods w/ARP "pro" bolts and they took it perfectly fine for dozens of bottles worth of passes. GM rods are really not as bad as people like to claim them to be... You'd be amazed at what you can reliably build with on a nicely built/machined 2 bolt studded, balanced cast crank, 3/8 ARP bolt rod, bottom end.

Same here with my 67' Camaro 275 shot with a four speed never had any problems. Like I said good bolts is the key. 396 .030 forged crank & 10:1 pistons squeezed the shit out of it....never should've sold that one!!!!

Sent from my iPhone using SoCalJetBoats

« **Reply #12 on:** March 14, 2014, 10:22:24 PM »

That's a sick ride man! Thanks for the info guys I'll slap some ARP bolts in them and call it good!

Sent from my iPhone using SoCal Jet Boats

« **Reply #13 on:** March 15, 2014, 12:14:25 PM »

Just make sure you have the big end resized after you install the bolts... the big end bores will distort a little bit with the installation of new bolts and the better clamping of the arp provides.... .002 out of round just installing new bolts is not uncommon.

« **Reply #14 on:** March 15, 2014, 06:00:30 PM »

Resizing is a must. Rebuilding 101. I guess I shouldn't assume that. Guys if you're building a motor and spending money on parts at least buy a book to make sure doing it right.

Sent from my iPhone using SoCalJetBoats

Ckaz21

Are these rods forged?

Beaveretriever

Re: Are these rods forged?

rush1

Re: Are these rods forged?

JBASHAM

Re: Are these rods forged?

Beaveretriever

Re: Are these rods forged?

Ckaz21

Re: Are these rods forged?

Flusher

Re: Are these rods forged?

Ckaz21

Re: Are these rods forged?

Jet Boat Maloney

Re: Are these rods forged?

rush1

Re: Are these rods forged?

Six-Oh-Nine

Re: Are these rods forged?

Jet Boat Maloney

Re: Are these rods forged?

Ckaz21

Re: Are these rods forged?

Six-Oh-Nine

Re: Are these rods forged?

Jet Boat Maloney

Re: Are these rods forged?