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#1
01-26-2024, 09:37 AM
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400 small register crank strength
Getting ready to build a 78' 400 for a customer and it has the lighter, thin counterweight, small crank register crank in it. Has anyone had any issues with these cranks in a performance application? The engine will have out of the box KRE D port heads and a hyd. flat tappet cam, probably be around 390-400 Hp range. I have other earlier N cranks but would like to stick with this crank since it's std/std., if it's strong enough.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#2
01-26-2024, 10:10 AM
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I would only have a start for concern once the 475 to 500 hp level was being reached.
The core of the crank where it counts in terms of strength is still the same, as in from a main or rod journal to the crank cheek. Plus with a 3.750” stroke the rod fillets are seeing 12.5% less G force then if the motor was a 455.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
01-26-2024, 10:44 AM
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Consider most Chevy motors have a small register too.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#4
01-26-2024, 11:52 AM
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Great option... A lot of Super Stock's run these.
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#5
01-26-2024, 12:44 PM
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Quote:
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
| The Following User Says Thank You to Gary H For This Useful Post: | ||
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#6
01-26-2024, 12:46 PM
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Quote:
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#7
01-26-2024, 01:11 PM
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Gotcha!
Like Paul said some of the "Stocker/SS folks" run them. Stick or auto?
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#8
01-26-2024, 02:09 PM
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Quote:
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| The Following User Says Thank You to PAUL K For This Useful Post: | ||
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#9
01-26-2024, 06:14 PM
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What the part number on the crank? Just curious, I tore down two later 400s not too long ago and both crank had a 350 part number on it
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78 T/A 4SPEED, Original paint, match #’s, mine since ‘99. 77 t/a sold 85 Monte Carlo SS sold 83 Mustang GT sold |
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#10
01-26-2024, 07:50 PM
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I know Bill Rink, (RIP) used the small register, light cranks in his stock and SS 74 GTO. That was a 350 inch engine however. He ran it hard and at high RPM's. 10.60's. Not aware of him ever breaking one.
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| The Following User Says Thank You to mgarblik For This Useful Post: | ||
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