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Username Post: 427 Builds
Bradfordjlenz
Newbie
Posts 9
06-02-21 05:06 PM - Post#2821047    

Hi once again, my 66 Caprice is nearing completion and I will be posting pictures when it looks good with a nice after shot that’s thanks to a lot of great advice from people here.
I have one more question, I was going to do a 427 build for fun and put it in a 68 Impala. Problem is I was looking at an LSX 6.2 block and was told you can’t bore it out to what it needs.
I thought Small Block using a 350 DART block but have been told you can only stroke it to a 383. I could try and find a 7.0 LS out of a vette if lucky enough to find one.
What do you think I should do and how?
Thanks again
Brad
Brad Lenz

japete92
"7th Year" Silver Supporting Member
Posts 1787
japete92
06-03-21 05:09 AM - Post#2821057    

  • Bradfordjlenz Said:
Hi once again, my 66 Caprice is nearing completion and I will be posting pictures when it looks good with a nice after shot that’s thanks to a lot of great advice from people here.
I have one more question, I was going to do a 427 build for fun and put it in a 68 Impala. Problem is I was looking at an LSX 6.2 block and was told you can’t bore it out to what it needs.
I thought Small Block using a 350 DART block but have been told you can only stroke it to a 383. I could try and find a 7.0 LS out of a vette if lucky enough to find one.
What do you think I should do and how?

Thanks again
Brad




The 427 was a BB (similar to the 396).

GM bored and stroked the sbc to 400 cu in in the late '60s/early 70s (? I don't recall exact dates). The '400' had 4.12" bore w/3.75" stroke. There are variations in 383, but 4.03" bore and 3.80" stroke is a common one. The crank from the '400' is the 'basis' for the 383 (which GM did not make for production). Oversimplifying, the 383 is a 400 with a 4" bore (like the 350 and 327).

Because it is EASY to achieve/better the torque and HP of the GM 427 BB, in a 383 sbc, that would be my recommendation (especially if the car was originally a sbc).

How? Buy one already built to meet your 'needs'.

Here is one on MANY:

https://smedingperformanc e.com/collections/chevy-e...

Pete

Bradfordjlenz
Newbie
Posts 9
06-06-21 12:58 PM - Post#2821228    

Thanks Pete,
Great advice, I have a 396 in my Caprice and love those BB.
Maybe that’s where I should stay.
Brad Lenz

brickwhite
Contributor
Posts 232
brickwhite
06-16-21 06:36 AM - Post#2821665    

I put a gen IV 454 (71-73) in my impala. about 450hp on pump gas 10.1 compression. Same external dimensions as a 396/427BB. To the untrained eye look the same or can be made to.

my rebuilt 454 was $2800 with non roller,cast iron oval port heads and aluminum intake, no carb,pullies,exhaust etc..

And they are easier to find rebuilt at 1/2 the price of an actual 60s 427...



Ted

65_Impala
Very Senior Member
Posts 4818
06-17-21 08:31 AM - Post#2821717    

The LSX block can do 454 cu-in. This is a completely different engine that never came in the car so it will require more effort to get it installed. Typically LS engines are fuel injected, but you can put a distributor on the front of one and use a carb if you really wanted to.

There are Dart blocks that can be used to build 427 cu-in small blocks. This size small block pretty much requires all aftermarket parts or else you're just limiting the power and wasting the displacement. 600 very streetable hp is easily possible in a build like this.

But, I think you are looking for a big block, which neither of those are. Finding a 454 and making it look like a 427 might be the cheapest path to a big block.
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