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#1
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All Pontiac / BOP Forged crankshaft
I received my All Pontiac/BOP forged crank last week so I figured I would share what I thought. 3" x 4.25"
All rod and main journals checked out to be round and of equal size. Real nice radius on all of the journals. Very nice ring to it when tapped with a hammer. Well packed with a liberal coating of cosmoline to protect it. Measurements Rods - 2.1986 Mains - 2.9986 Looks like a winner! Appears to be a very nice crankshaft for the money. Make sure you get your order in before they're gone!
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
#2
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Nice to hear they are quality; I cant say off the top of my head, but it looks like they are shooting for .0014 clearance on the bearings. When you get it together can you post the thrust amount ?
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Two 1975 455 Grandvilles & '79 455 Trans Am ‘69 Camaro SS 396/375 (owned since ‘88) ‘22 Toyota Sequoia V8 ‘23 Lexus LS500 awd ‘95 Ford F-super duty 4wd 7.3 p-stroke & countless Jeeps & off road vehicles. Last edited by 455Grandville; 04-15-2007 at 03:33 PM. |
#3
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James, I'll trade you 3 pieces of a nice cast Eagle crank for that new block.
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My Daddy bought me a car but all I got was this old Pontiac. |
#4
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Quote:
"I received my All Pontiac/BOP forged crank last week so I figured I would share what I thought. 3" x 4.25" All rod and main journals checked out to be round and of equal size. Real nice radius on all of the journals. Very nice ring to it when tapped with a hammer. Well packed with a liberal coating of cosmoline to protect it." I think I basically reported the same things on the 4" stuff! LOL! Agree, I think we have a good product here. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#5
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Quote:
__________________
James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
#6
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R-70.Those are good #S on the rod and mains to get decent clearances.What did the Thrust width measure??.I have a crank waiting for me at a freinds place in upper New York.Just about ready to go and pick it up.Thanks for posting the Pics.Looks real nice.
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#7
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Quote:
Has anyone had one balanced yet?
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Holley Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
#8
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The thrust width should be somewere around 1.140".Just curious to know.Thanks R70.These cranks look real nice!
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#9
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My 4.00" crank measured at 2.998" on the mains with 1.205" wide journals on #1-3,thrust width 1.139" on #4, 1.943" wide journal on #5. Rods are 2.198" with 2.085" wide journals. Snout is 1.373", rear seal area 3.185", spigot O.D. 2.75",I.D. 1.703". All consistent, and pretty much spot on I'd say.
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#10
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Thats good to hear.It sure is nice when specs are spot on.Thanks for the update.
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#11
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Cool Parts to compliment those RACE heads. :-)
Jim |
#12
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For 350$ Crankshaft Specialist will give it their Ultra Light treatment and double knife edge it.The one they did for me looks very nice.
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#13
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Nice numbers. And Dragncar, that is very good info too. Thank you to both of you.
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#14
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How much weight reduction was obtained with the lightening process?I was thinking of doing some weight reduction as well.
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#15
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Something to consider. I read that these new forged cranks weigh about 75 lbs & I assume they were trimmed of all unnecassary weight, for both performance & cost. My factory 455 crank weighed 69 lb affter cleaning it up. Steel is more dense than cast iron, which accounts for the weight difference. So if the performance level doesn't require a forged crank, the lighter cast crank would be better.
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#16
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If I can find a good scale,something better than a bathroom scale I will post the weight.All the rod throws were gun drilled and just about every surface looks machined,almost looks like a billet.The best info on the origin of my crank is that it is probly a 5140 990 crank.Pontiac sold a bunch of blanks to the aftermarket crank companys like Hank the Crank back in the day.They could get up to 4.5 stroke out of the factory blanks.The rods and mains came in at 2.1998 and 2.9988.
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#17
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Thanks to all for the great info.
My 4.5" crank was shipped today, I was waiting until all the good news was posted. Gonna build a 535" IA2 within the next year, and I wanted to get mine from this first batch. Frank told me he had but one 4.5" piece left after he sold me mine. Thanks again, AllPontiac!
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Regards, "455HO" Lloyd 2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98 |
#18
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My 4.5" crank came today. I wonder how many were sold if they only have 1 left. Pic just out of the box.
Last edited by Pitch 400; 12-09-2013 at 12:24 PM. |
#19
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We have more on the way of every size.
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Bob C. Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads Boss Bird Funny Car Best pass to date 08/06/2016 6.027@231.64 Allpontiac Big Chief Aluminum Engine Block http://www.AllPontiac.com |
#20
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