Pontiac OHC rods vs Chevy 250 - Inliners International Bulletin Board

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#62227 - 12/20/10 07:51 PM Pontiac OHC rods vs Chevy 250
tlowe #1716 tlowe #1716 12 PORT ADVERTISER Active BB Member Registered: 04/01/04 Posts: 2335 Loc: Dysart, Iowa	I edited this post and title. Did it to help anyone that needs the info in the future and to make it easier to find. Check out the beefy rod on the left in most picture. It is from a 230, 250 Pontiac inline OHC engine. See how beefy it is in most areas compared to a stock 153/ 250 rod? It is marked with GM on one side. Does anyone have anymore of these? Edited by tlowe #1716 (12/22/10 07:17 AM) _________________________ 12 PORT ADVERTISER http://www.inliners.org/Advertisers/index.html trbo writeup http://www.inliners.org/ubbthreads/ubbthreads.php?ubb=showflat&Number=43253&fpart=1
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#62236 - 12/21/10 08:37 AM Re: What rods are these? [Re: tlowe #1716]
Beater of the Pack Beater of the Pack Active BB Member Registered: 10/06/07 Posts: 2492 Loc: Northern Nevada	None of mine look like that. _________________________ "I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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#62241 - 12/21/10 01:00 PM Re: What rods are these? [Re: Beater of the Pack]
tlowe #1716 tlowe #1716 12 PORT ADVERTISER Active BB Member Registered: 04/01/04 Posts: 2335 Loc: Dysart, Iowa	They look like a good alternative for the 230/ 250 chevy engines. Edited by tlowe #1716 (12/22/10 06:58 AM) Edit Reason: Better info _________________________ 12 PORT ADVERTISER http://www.inliners.org/Advertisers/index.html trbo writeup http://www.inliners.org/ubbthreads/ubbthreads.php?ubb=showflat&Number=43253&fpart=1
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#62242 - 12/21/10 02:05 PM Re: What rods are these? [Re: tlowe #1716]
strokersix strokersix Active BB Member Registered: 05/23/09 Posts: 303 Loc: NW Illinois, USA	I pulled a set from a later '68 I think OHC Pontiac that had GM on them just like that. I remember they looked beefier than regular Chevy rods but not sure if it's the same as your photo.
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#62243 - 12/21/10 03:16 PM Re: What rods are these? [Re: strokersix]
sprintbird sprintbird Active BB Member Registered: 12/17/04 Posts: 6 Loc: Ohio	Ditto. Looks like Cammer rods to me also. Pontiac had the right idea!
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#62244 - 12/21/10 04:24 PM Re: What rods are these? [Re: sprintbird]
tlowe #1716 tlowe #1716 12 PORT ADVERTISER Active BB Member Registered: 04/01/04 Posts: 2335 Loc: Dysart, Iowa	Sprintbird and Stroker6, I think you are on the right track. Got any pics? _________________________ 12 PORT ADVERTISER http://www.inliners.org/Advertisers/index.html trbo writeup http://www.inliners.org/ubbthreads/ubbthreads.php?ubb=showflat&Number=43253&fpart=1
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#62246 - 12/21/10 06:20 PM Re: What rods are these? [Re: tlowe #1716]
Mean buzzen half dozen A.K.A. Hank Mean buzzen half dozen A.K.A. Hank Active BB Member Registered: 09/23/04 Posts: 4550 Loc: Ca	I have been told a long long time ago to use Pontiac OHC 6 4 bbl engine rods, because they were supposed to be stronger. Never got a chance to look @ them. Check the Pontiac 6 forum. MBHD _________________________ 12 port SDS EFI
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#62247 - 12/21/10 07:51 PM Re: What rods are these? [Re: Mean buzzen half dozen A.K.A. Hank]
Beater of the Pack Beater of the Pack Active BB Member Registered: 10/06/07 Posts: 2492 Loc: Northern Nevada	Once again I am frustrated in the lack of information available on connecting rod specs. There is plenty of detailed info for pistons, cranks, cams, lifters, rockers, valves, springs, etc. But rods? Some stuff for Vs but we should be able to find all specs for every rod ever used in a production engine. Thank God for oral tradition! My books don't help. _________________________ "I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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#62251 - 12/22/10 04:29 AM Re: What rods are these? [Re: Beater of the Pack]
strokersix strokersix Active BB Member Registered: 05/23/09 Posts: 303 Loc: NW Illinois, USA	I found them: http://i965.photobucket.com/albums/ae131/strokersix/DSCN37001.jpg
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#62253 - 12/22/10 05:17 AM Re: What rods are these? [Re: strokersix]
Nexxussian Nexxussian Active BB Member Registered: 06/12/07 Posts: 1337 Loc: Anchorage	Stroker, I'm having difficulty reading your post. The link worked fine, but I can't see if there is anything below it (there is a scroll bar on the bottom and right, but neither will move for me ). What did you find them for? Edited by Nexxussian (12/22/10 05:18 AM) Edit Reason: durn auto correct _________________________ My, what a steep learning curve. Erik II#5155
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#62257 - 12/22/10 06:59 AM Re: What rods are these? [Re: Nexxussian]
tlowe #1716 tlowe #1716 12 PORT ADVERTISER Active BB Member Registered: 04/01/04 Posts: 2335 Loc: Dysart, Iowa	They have the same dimensional sizes. Small end pin .927 Big end made for a 2" crank pin. _________________________ 12 PORT ADVERTISER http://www.inliners.org/Advertisers/index.html trbo writeup http://www.inliners.org/ubbthreads/ubbthreads.php?ubb=showflat&Number=43253&fpart=1
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#62258 - 12/22/10 07:13 AM Re: What rods are these? [Re: tlowe #1716]
strokersix strokersix Active BB Member Registered: 05/23/09 Posts: 303 Loc: NW Illinois, USA	Nex, I found them for Tom since he asked for a photo. Edited by strokersix (12/22/10 07:14 AM)
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#62263 - 12/22/10 10:37 AM Re: What rods are these? [Re: strokersix]
strokersix strokersix Active BB Member Registered: 05/23/09 Posts: 303 Loc: NW Illinois, USA	Beware not all OHC rods are beefy like these. I have a set of early ('65?) ones that are light and these later ('68?) ones that are heavy. I don't know if it's a production date difference or if it's 1 barrel versus 4 barrel or 230 versus 250. Maybe some Poncho guys will jump in with the details.
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#62267 - 12/22/10 03:51 PM Re: What rods are these? [Re: strokersix]
tlowe #1716 tlowe #1716 12 PORT ADVERTISER Active BB Member Registered: 04/01/04 Posts: 2335 Loc: Dysart, Iowa	Did some more checking on these rods. They may be beefy but they are made out of inferior material compared to the Chevy's. Took a small ball peen and struck each one. The pontiac rod has a dull thud. The Chevy rod has a tool steel ring to it. _________________________ 12 PORT ADVERTISER http://www.inliners.org/Advertisers/index.html trbo writeup http://www.inliners.org/ubbthreads/ubbthreads.php?ubb=showflat&Number=43253&fpart=1
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#62282 - 12/23/10 07:35 AM Re: What rods are these? [Re: tlowe #1716]
TheSilverBuick TheSilverBuick Active BB Member Registered: 12/22/10 Posts: 25 Loc: Ely, NV	I might be the new guy, but I find that funny, they are both made of drop forged steel (per the service manuals). Plus remember the Pontiac engines from the factory made peak power a good 1,000rpm higher than the chevy (and even the base engine made more HP). They used beefier forged rods. Here are a few pictures of the rods out of my '69 Pontiac OHC _________________________ Rebuilding an OHC Pontiac 250 with EFI and a Turbo
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#62283 - 12/23/10 07:52 AM Re: What rods are these? [Re: TheSilverBuick]
strokersix strokersix Active BB Member Registered: 05/23/09 Posts: 303 Loc: NW Illinois, USA	Notice the camshaft oiler groove on the OHC rods? Pontiac must have left that feature in for some reason. Or Chevy designed the rods. Probably left there so the rods can be used in other applications with cam in block. Maybe marine engines?
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#62284 - 12/23/10 08:22 AM Re: What rods are these? [Re: strokersix]
TheSilverBuick TheSilverBuick Active BB Member Registered: 12/22/10 Posts: 25 Loc: Ely, NV	I've heard not all Pontiac's had that oil groove. I've read it was phased out by '69, but my block and head are both '69 date coded, so... I can only correlate the rods to those dates. My best engineering guestimate is that they are there to spray the accessory drive internals. The distributor drive gear and fuel pump eccentric. _________________________ Rebuilding an OHC Pontiac 250 with EFI and a Turbo
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#62288 - 12/23/10 09:08 AM Re: What rods are these? [Re: TheSilverBuick]
Greybeard Greybeard Active BB Member Registered: 01/27/06 Posts: 75 Loc: Sequim Washington	I worked on a Cosworth Vega in the '70s and they had what was referred to as a small journal, 6 cylinder version of a Z28 (or pink)rod. They were subjected to peening and magged. What I remember is that they looked a lot like the ones you are showing, but 35 years does cloud the memory a bit. We turned that motor near 8grand repeatedly. The aftermarked sold the rods under the same part #s as with the Chevy11. Built and ran a few Chevy11s in out 2.5litre boat but always went to the after market with them and remember the notes referring to the Cosworth. _________________________ '37 Master Deluxe 2dr sedan '66 Elcamino, 250, 3sp OD http://greybeard.shutterfly.com/
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#62377 - 12/28/10 08:44 AM Re: What rods are these? [Re: Greybeard]
67pete300 67pete300 Active BB Member Registered: 03/09/08 Posts: 50 Loc: Burke, VA	Good to see you found your way over here SilverBuick! I saw this thread and immediately thought of you and here you are already... _________________________ 67 Chevelle 300 2 door post 230 Inline six, 3 on the tree 58k Original miles
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#62378 - 12/28/10 09:21 AM Re: What rods are these? [Re: 67pete300]
TheSilverBuick TheSilverBuick Active BB Member Registered: 12/22/10 Posts: 25 Loc: Ely, NV	Hi Pete, I've browsed this forum for information for quite a while now. This thread is why I finally signed up, took a day though for the admin approval though. _________________________ Rebuilding an OHC Pontiac 250 with EFI and a Turbo
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