Does my 427 have the right flywheel? - see image
12-12-2018, 01:41 PM
#42
Le Mans Master
Member Since: Sep 2001
Location: Unreconstructed, South Carolina
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How 'bout pull the pan & measure stroke?
With pan off and a wrench on crank
Pick a rod any rod
Roll motor through until rod is at 12 O'clock
Measure from straight edge Up to rod cap
Roll motor through until same rod cap is at 6 O'clock
TRY and lay straight edge across pan rails as best you can
Measure from rod straight edge Down to rod cap
sum of those two measurements should be close to either 3.76" (427) or 4" (454).
You might use same method but instead drop a string from cap to floor ... or use a tape measure from floor to cap
Regardless, you're looking for approx 3 3/4" or 4"
With pan off and a wrench on crank
Pick a rod any rod
Roll motor through until rod is at 12 O'clock
Measure from straight edge Up to rod cap
Roll motor through until same rod cap is at 6 O'clock
TRY and lay straight edge across pan rails as best you can
Measure from rod straight edge Down to rod cap
sum of those two measurements should be close to either 3.76" (427) or 4" (454).
You might use same method but instead drop a string from cap to floor ... or use a tape measure from floor to cap
Regardless, you're looking for approx 3 3/4" or 4"
12-12-2018, 02:15 PM
#43
Instructor
Thread Starter
Puling pan now. Wouldn't the crank have a casting number that would tell me weather it's 454 or 427?
I will measure to be sure. I think it's a 454 crank. It has a 454 flywheel, it that flywheel was on a 427 it would shake like a hula girl wouldn't it?
I will measure to be sure. I think it's a 454 crank. It has a 454 flywheel, it that flywheel was on a 427 it would shake like a hula girl wouldn't it?
12-12-2018, 10:30 PM
#45
Race Director
List of all 427-454 crank casting numbers.. https://www.mortec.com/cranks.htm. and here is what casting number looks like.. https://www.ebay.com/itm/CHEVROLET-4...Condition=3000. The number is small and rough-cast. 6-8-3-9can be confused with each other.
Last edited by derekderek; 12-12-2018 at 10:35 PM.
12-13-2018, 08:52 PM
#47
Le Mans Master
No way are you going to get the rods and pistons out the bottom- even with the crank removed. The main webs hang into the bottom of the cylinders just enough----
12-14-2018, 09:10 AM
#50
Safety Car
don't know what the vibration intensity might be with a 454 with just one being wrong, or both being wrong, or just flywheel, or just the balancer.. or a 427 with one or both of them being wrong
potentially a nice surprise that you might have those extra cubes.
I wonder how the shops "balance" engines. especially 454's. do they bolt the externally weighted balancer and flywheel to the assembly when spinning it up for balancing? vs not doing the same for a 427.
what about the bigger stroke aftermarket cranks?
potentially a nice surprise that you might have those extra cubes.
I wonder how the shops "balance" engines. especially 454's. do they bolt the externally weighted balancer and flywheel to the assembly when spinning it up for balancing? vs not doing the same for a 427.
what about the bigger stroke aftermarket cranks?
12-14-2018, 09:28 AM
#51
Race Director
I put a 400 small block in a boat. bought a 400 flywheel. BUT, the flywheel I got was 454. boat shook like a 650 Triumph at idle. bow rails oscillated about 6 inches back and forth. I went to Fonse performance in Erial NJ. he rebuilt and balanced the 400. used the 454 flywheel. he didn't take very much meat off the counterweights. I don't think he took any off the balancer-which was correct OE 400 balancer. engine was perfect smooth. so it doesn't take much weight to do very bad things.
12-14-2018, 01:11 PM
#52
Dr. Detroit
Member Since: Mar 2012
Location: New Braunfels Texas
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Ok......427 balancer with a 454 flywheel is flat out wrong as we know. OP says the engine is original......but that is not 100% so pull the pan and measure stroke......if it is 4.00 inch....use the flywheel and replace the balencer....if it is 3.760.....put a neutral flywheel on it and live happily ever after......
My money says the flywheel is wrong.......the flywheel has nothing to do with the engine builder unless he sourced the part...and we know that builders don't generally install engines....soooooooo.......
Jebby
My money says the flywheel is wrong.......the flywheel has nothing to do with the engine builder unless he sourced the part...and we know that builders don't generally install engines....soooooooo.......
Jebby
12-14-2018, 04:14 PM
#53
Instructor
Thread Starter
Ok......427 balancer with a 454 flywheel is flat out wrong as we know. OP says the engine is original......but that is not 100% so pull the pan and measure stroke......if it is 4.00 inch....use the flywheel and replace the balencer....if it is 3.760.....put a neutral flywheel on it and live happily ever after......
My money says the flywheel is wrong.......the flywheel has nothing to do with the engine builder unless he sourced the part...and we know that builders don't generally install engines....soooooooo.......
Jebby
My money says the flywheel is wrong.......the flywheel has nothing to do with the engine builder unless he sourced the part...and we know that builders don't generally install engines....soooooooo.......
Jebby
The block is number matching.... The flywheel is definitely 454 ... I'm going to pull the pan however I have been down hard with the flu... first day up and around in 3 days... Bitch...
I was told the engine rebuild was done in 2012 but do not know builder. I am wondering if they dropped in a 454 complete rotating assembly. I will get the pan pulled, crank casing number and measure stroke.
It will be about a week... I'll post my findings... Also need to confirm HB...
12-14-2018, 06:26 PM
#54
Race Director
Man, I don't care if you are sick. We gotta know!!! Busting your *****. I assume 2012 was before you owned the car?
12-14-2018, 07:12 PM
#55
Instructor
Thread Starter
12-14-2018, 07:28 PM
#56
Le Mans Master
Member Since: Sep 2001
Location: Unreconstructed, South Carolina
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TK ... I'm with you that it's likely a 454 crank ... and I'm anxious to find out as well. ... but do give yourself time to fully recover before you go at it again. It's a toy and it can wait; we can as well. Godspeed.
12-21-2018, 12:21 PM
#58
Instructor
Thread Starter
Alright boys!!!! got the answer!
Measured the stroke 3.76" dead on. Looks like someone put the wrong flywheel on it.
internals look original as the rods and caps have been numbered 1/1,2/2 ect.
looks like the builder tore it down, referenced all the parts and locations, machined it, replaced what was necessary and reassembled.
Unless the gurus in Corvette land say otherwise, I'll be ordering a new 427 flywheel.
Also as a note about oil pans... i pulled a piece of silicone sealer from the oil pump inlet screen. people have got to be careful with that crap.
Measured the stroke 3.76" dead on. Looks like someone put the wrong flywheel on it.
internals look original as the rods and caps have been numbered 1/1,2/2 ect.
looks like the builder tore it down, referenced all the parts and locations, machined it, replaced what was necessary and reassembled.
Unless the gurus in Corvette land say otherwise, I'll be ordering a new 427 flywheel.
Also as a note about oil pans... i pulled a piece of silicone sealer from the oil pump inlet screen. people have got to be careful with that crap.
12-21-2018, 12:22 PM
#59
Dr. Detroit
Member Since: Mar 2012
Location: New Braunfels Texas
Posts: 9,963
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Alright boys!!!! got the answer!
Measured the stroke 3.76" dead on. Looks like someone put the wrong flywheel on it.
internals look original as the rods and caps have been numbered 1/1,2/2 ect.
looks like the builder tore it down, referenced all the parts and locations, machined it, replaced what was necessary and reassembled.
Unless the gurus in Corvette land say otherwise, I'll be ordering a new 427 flywheel.
Also as a note about oil pans... i pulled a piece of silicone sealer from the oil pump inlet screen. people have got to be careful with that crap.
Measured the stroke 3.76" dead on. Looks like someone put the wrong flywheel on it.
internals look original as the rods and caps have been numbered 1/1,2/2 ect.
looks like the builder tore it down, referenced all the parts and locations, machined it, replaced what was necessary and reassembled.
Unless the gurus in Corvette land say otherwise, I'll be ordering a new 427 flywheel.
Also as a note about oil pans... i pulled a piece of silicone sealer from the oil pump inlet screen. people have got to be careful with that crap.
Jebby