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Username Post: 427 Builds
"7th Year" Silver Supporting Member
Posts: 1787
Loc: No. Virginia
Reg: 01-18-13
06-03-21 05:09 AM - Post#2821057    
    In response to Bradfordjlenz

  • 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

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:



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