gregrob

iTrader: (8)

What stops us from using a 4.125 SBC stroker crank?

I'm just saying 4.125 crank and .060 over would be a 427...

1redta

I would think one problem would be clearancing on the oil pan rail?

Puck

iTrader: (17)

Nowhere near enough clearance in the block - you will cut well into the water jacket on every cylinder trying to clear that much crank.

gregrob

iTrader: (8)

What about welding the water jackets then? I wonder if anyone has ever tried it.

96capricemgr

iTrader: (1)

Cast doesn't weld well and I believe you have a pesky little cam in the way.
Such cranks are meant for aftermarket gen 1 blocks which are available with raised cam tunnels.

gregrob

iTrader: (8)

Cast can weld fine with the right materials and know how.

What if you ran a small base circle cam?

stevo9389

yes but the cost and impracticality alone is enough to keep people away unless you have more money than you knew what to do with. it might only last a few track passes. you will also be severely limmited on head/intake choice unless you want to convert some SB2.2 heads. if you want a 427 it would be a lot cheaper to just buy a LS7 or a gen 1 big block.

gregrob

iTrader: (8)

Why would you be limited on head / intake choices? If it were still the stock block you could run what ever topend any lt1 can run.

Puck

iTrader: (17)

The whole cam itself would need to be moved in relation to the crank. A small base circle is still not enough. Even a 396 crank takes a lot of clearancing.

There is a reason it has not be done before in the 17 years or so we have had LT1s. It is physically impossible with the factory block.

udlose99ta

iTrader: (18)

The biggest i have seen ran is a 4.00 crank, It was a 410. Even with the 4.00 crank i would not run over a 5.7 rod and you have to grind the rod bolts. But you can do the 3.875 with a .060 and get 401ci ( I think) with no problems i would think

wht97ws6ta

You might could run a 2" rod journal which would help very little but every little bit counts. The number one thing thats limiting you from that stroke is deck height. You cant stuff that long of a stroke in a 9" deck and have a feasable rod or compression height combination. I wouldnt recommend running that kind of stroke with a 5.7 or 5.85 rod and with a 6" rod that would put u less than 1" of compression height on the piston. Its already tough gettin a 4 inch arm in these blocks, and with the Cyl heads available for these engines the extra stroke isnt gonna get you the gains expected.