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#1
01-06-2005, 08:48 PM
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Bent my stroked 400 crank, need to build another. It was a "N" nodular crank. I have two others that are not "N" cranks. Engine makes over 500 HP without bottle. Not planning on using the bottle anymore on this engine. Will the standard cast crank be acceptable?
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1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot 1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD! 1964 421 GP-Sold 6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold |
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#2
01-06-2005, 08:48 PM
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Bent my stroked 400 crank, need to build another. It was a "N" nodular crank. I have two others that are not "N" cranks. Engine makes over 500 HP without bottle. Not planning on using the bottle anymore on this engine. Will the standard cast crank be acceptable?
__________________
1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot 1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD! 1964 421 GP-Sold 6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold |
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#3
01-06-2005, 09:51 PM
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I can't answer your question for sure about how much stronger the N crank is versus the standard cast crank or what the HP limit is, but if you are interested in another N crank I think I can help you.
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North Dakotas fastest REAL GTO 10.10 @ 131 MPH in the 1/4 Hoping to get it back together some year. www.jandjrepairandrestoration |
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#4
01-06-2005, 11:14 PM
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Jeff, drop me an email
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1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot 1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD! 1964 421 GP-Sold 6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold |
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#5
01-07-2005, 07:46 AM
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It is generally accepted the nodular iron is a better material for higher rev engines, as it has a better grain structure to absorb harmonics. Plain cast cranks are rigid enough for mild performance use, but once they reach their structural limit, they will go away.
400 nodular cranks are plenty easy to come by. The 350, 389 ('66 only) and some of the 326s are also the same nodular casting, and can be balanced to work fine in a 400 race engine. |
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#6
01-07-2005, 05:15 PM
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But the "N" must be present on all nodular cranks, right?
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1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot 1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD! 1964 421 GP-Sold 6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold |
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#7
01-09-2005, 10:13 AM
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Timely question. I stripped down a 75 455 block last night and found a "non-N" crank, PN 496453 and was wondering if it would be suitable for my intensions, race motor of less than 600HP. Is it really nodular iron and just not marked? or is it a different material and if so, is it suitable?
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'71 GT37 9.75/136 474 w/#62 D-ports from SD |
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#8
01-10-2005, 11:38 AM
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In general, yes, the "N" sould be there. I've heard the later 455s were still nodular without the "N", but have no way to verify this.
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