Whats the biggest Crank that a 400 sbc can take?

RobZ · 06-19-2002, 02:39 AM

Well I have right now a bare 400 sbc.I will be given a 3.800 scat crank from a buddy of mine.My question will it fit on a 400 sbc?

texlurch · 06-19-2002, 07:34 AM

thats about the longest stroke you can fit in a stock block, and you will probably have to use a small base circle cam to clear the rods. You will still have to do some clearancing on the pan rails, and the bottom of the cylinders. I would double check for piston availability also, although you could get custom ones built.

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Texlurch - 68 Camaro (Just a little ol' LT1 with a Hot Cam, I SWEAR

" a little spray never hurt anyone, spank you very much!"
or the old standby:"I came here to race, not sell real estate. You ain't scared, is ya?"

gs400tx · 06-20-2002, 08:21 AM

they can go to 434 with a 4" stroke.. but its a pain. Check into stroker clearanced rods. Most H beams come clearanced. Some reduced base circle cams are not much smaller than standard and will often times not be enough clearance. I ended up with a .9" basecircle on a 3.75 stroke but i am using I beam rods.

RobZ · 06-21-2002, 05:46 PM

thanx for the info

texlurch · 06-22-2002, 02:37 AM

All the 434's I've seen used aftermarket or Bowtie blocks, and it was still close. On a stock block you have to be real careful not to hit water. I have also had the block poured with Hard block before we started grinding, just to be on the safe side. But each block has to be checked to be sure.

------------------
Texlurch - 68 Camaro (Just a little ol' LT1 with a Hot Cam, I SWEAR

" a little spray never hurt anyone, spank you very much!"
or the old standby:"I came here to race, not sell real estate. You ain't scared, is ya?"