454 block with 427 components - Chevelle Tech

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post #1 of 40 (permalink) Old Oct 13th, 10, 8:52 AM Thread Starter
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454 block with 427 components

I don't remember where, but I was reading where someone used 427 components in a 454 block. Why would someone do this? Is there any advantages/disadvantage to it. I am no engine guru so I figured I would ask.
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post #2 of 40 (permalink) Old Oct 13th, 10, 8:54 AM
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Re: 454 block with 427 components

427 and 454 blocks are identical. They just used different cranks. Whatever crank was installed would make a 427 or a 454. Basically, bigger engine makes more power. No big issue.

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post #3 of 40 (permalink) Old Oct 13th, 10, 9:47 AM
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Re: 454 block with 427 components

That's what my engine consists of.....454 block, 396 crank. The hardest part was finding pistons that are for a 427. Someone told me that I can't use 454 pistons due to the skirt length.

Anyway, I don't think there are any advantages either way, other than I don't need an externally balanced flywheel......
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post #4 of 40 (permalink) Old Oct 13th, 10, 9:49 AM
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Re: 454 block with 427 components

The 427 stroke is 3.76", the 454 is 4.00".

Some fellows enjoy the shorter-stroke engine's
powerband and RPM range.
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post #5 of 40 (permalink) Old Oct 13th, 10, 10:17 AM
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Re: 454 block with 427 components

Quote:
Originally Posted by baloo28 View Post
Someone told me that I can't use 454 pistons due to the skirt length...
Not skirt length...can't be used due to the different compression height between a 427 and a 454 piston when using the same length rod.

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post #6 of 40 (permalink) Old Oct 14th, 10, 6:52 PM Thread Starter
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Re: 454 block with 427 components

Thanks for the info. If one was useing the 427 crank could 454 rods be used?
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post #7 of 40 (permalink) Old Oct 14th, 10, 7:05 PM
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Re: 454 block with 427 components

I have a good set of used 427 pistons. I'd have to check on the overbore size.
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post #8 of 40 (permalink) Old Oct 14th, 10, 7:05 PM
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Re: 454 block with 427 components

I used a 396 crank/rods and a 454 block, no problems at all. I just got 427 pistons and off I went.

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post #9 of 40 (permalink) Old Oct 14th, 10, 7:21 PM
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Re: 454 block with 427 components

my mostly gm 427 has standard length 396/427 rods,396 crank.my newly built 427 motor is 396 crank,the longer rods,shorter comp height kb pistons,both all forged parts,60 overbore

rth
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post #10 of 40 (permalink) Old Oct 14th, 10, 10:09 PM
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Re: 454 block with 427 components

Quote:
Originally Posted by 70topless goldrush View Post
Thanks for the info. If one was useing the 427 crank could 454 rods be used?
396/427/454 rods are all the same length.
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post #11 of 40 (permalink) Old Oct 15th, 10, 3:26 AM
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Re: 454 block with 427 components

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Originally Posted by Rich-L79 View Post
396/427/454 rods are all the same length.
yep,454 crank is 4 inch stroke,rods are all the same,forgot that,crank and bore size make the differences between 396/427/454,---- 454 and 427 both 4.250 bore
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post #12 of 40 (permalink) Old Mar 25th, 11, 7:01 PM
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Re: 454 block with 427 components

Quote:
Originally Posted by Stikman33 View Post
I used a 396 crank/rods and a 454 block, no problems at all. I just got 427 pistons and off I went.
I am having that same engine built right now! I have the "802" heads which I think are very similar closed chamber heads like your 215's. Correct me if I'm wrong.... Do you know the CC's on your heads, and what 427 pistons are you running? Thanks in advance for any help. I am also running a hydraulic roller setup and haven't decided on my cam yet
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post #13 of 40 (permalink) Old Mar 25th, 11, 7:35 PM
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Re: 454 block with 427 components

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Originally Posted by bracketchev1221 View Post
427 and 454 blocks are identical. They just used different cranks. Whatever crank was installed would make a 427 or a 454. Basically, bigger engine makes more power. No big issue.
The 512 casting 427s are the same but the earlier 427s aren't clearanced for the larger 454 crank.

Jerry
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post #14 of 40 (permalink) Old Mar 25th, 11, 7:41 PM
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Re: 454 block with 427 components

Basically,the MAIN reason for this concoction is for the internal balance that 396 or 427 cranks have as the advantage compared to a 454 with the external balance feature.Internally balanced is the way to go and you can get a 454 internally balanced but if youre on a budget like most of us on here,than most of us go for the 396 or 427 crank.

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post #15 of 40 (permalink) Old Mar 25th, 11, 8:19 PM
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Re: 454 block with 427 components

It's all about bein' able to say " It's got a four-twenny-seben in it"

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