What to do with BBC 427 tall deck?
What to do with BBC 427 tall deck?
The specs for the 427 truck block are IDENTICAL in bore and stroke to the standard 427 with the expection of the block, and the tall deck is heavier as well. The crank and rods are also the same as a standard deck 427. On a production block, max safe overbore without filling is around .060″, and you can stroke it about 1/4″ max, but beware.
How to build a tall deck 427 based big block?
4.25 stroke + 6.385 rods + off-the-shelf 454 normal-pin-height pistons + steel shim head gasket. Deck the block .020 to .030 to bring the piston closer to the top. You can use a composition head gasket; but you need to take more off the deck. If you can find a set of 6.405 rods; they were built to do this.
How tall is a block deck on a car?
The block deck height is 0.400″ taller than the production big blocks that were designed for cars and light trucks, so there are no performance manifolds that will fit the heads without using spacer plates, which are not acceptable by many fellows because of their failure to seal up in all applications.
What kind of engine is a tall block BB?
Tall block BB’s are sometimes categorized as “industrial” engines.This stems from the fact that they were mainly used in heavy duty trucks suitable for farm and/or fleet type work. Although their original intent is more “pedestrian” in nature….they can be built to performance standards.
The specs for the 427 truck block are IDENTICAL in bore and stroke to the standard 427 with the expection of the block, and the tall deck is heavier as well. The crank and rods are also the same as a standard deck 427. On a production block, max safe overbore without filling is around .060″, and you can stroke it about 1/4″ max, but beware.
4.25 stroke + 6.385 rods + off-the-shelf 454 normal-pin-height pistons + steel shim head gasket. Deck the block .020 to .030 to bring the piston closer to the top. You can use a composition head gasket; but you need to take more off the deck. If you can find a set of 6.405 rods; they were built to do this.
What are the pros and cons of a 427 tall deck?
You could put a longer stroke crank, or have the original stroked at the machine shop, and pick ip alot of torque and hp and still keep it on pump gas. The only real major hangup would be any parts that rely on the block hight/width, such as the cam drive, intake, pushrods, and the distributor.
How tall is a 427 tall Stovebolt deck?
Or you can build a 496 stroker,run 8:1 forged pistons and an 8-71 blower at 10% underdriven and make some really impressive torque. Re: 427 Tall Deck…
