How to Stroke Big Block Chevy Engine and more Q&A
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Once you start building a big block Chevy engine, whether for street or track, you will find it can get very complicated, must because there were so many variations, including two distinct block and head configurations. So it is easy to get the wrong parts, or try to fit parts that just won’t work in your engine. Here are some tricky questions anwered about building a big block Chevy V-8.
1.How to stroke a big block Chevy engine?
Owing to the large number of variations, and the desire for more power, lots of folk want to know how to stroke a big block chevy engine. The first essential is to find exactly what engine you have, and you start by finding the block casting number, and then measuring things. You need a tall block engine of fairly small capacity to stroke it.
Then, you need to work out what capacity you want, and get a suitable crankshaft with, for example, a 4.25 in stroke. You can measure the crank, but need precise measuring equipment. Next, you want to find some suitable connecting rods, which will have to be changed. Ideally, you want the longest ones you can get. With very short connecting rods, engine breathing is restricted as piston descends too quickly. So, get some long conn rods.
Then, you will want some forged pistons, and the advantage of many of these is that the crowns can be skimmed to suit the block height you have. All in all, you can see that ‘how to stroke a big block Chevy engine’ is quite a big question.
2.How to measure deck height big block chevy?
How to measure deck height big block chevy is an easier question to answer. Because all the big blocks are V-8s, you cannot just use a height gauge to measure the height from a bed as you can with an inline engine.
Instead, you need to get a special gauge designed for the job. The gauge fits inside the cylinder and you measure down from the top deck. These gauges cost around $50 new.
3.How to install dome pistons in a big block chevy?
It is not so much ‘how to install dome pistons in a big block chevy’ as will dome pistons fit inside my big block Chevy without hitting the heads. There is really only one way of finding ow to install dome pistons in a big block chevy and that is by measuring everything on a proper surface plate. Also, you need to measure the capacities of the combustion chambers as these many have been modified.
The dome pistons cam originally from the early big block engines, and were designed to form the combustion chamber. Some of the dome pistons for 396, 402 and 427 engines can be machined flat if need be. Or you can reduce the amount of the dome by machining. Also, remember that pistons designed for open chambers don’t usually work in closed chambers.
4.How much does my big block chevy weigh?
This question is as long as a piece of string because it depends on the capacity of your big block Chevy engine. For example, the 396 big block V8 weighs about 630 lb. However, the 427s and larger units weigh more, but the smaller engines do not weigh much less.
If your big block engine has an aluminum cylinder block and aluminum heads, it will weigh around 580 lb, depending on the capacity and exact specification.
5. How big can a chevy 229 cid block be bored
Usually, engines are bored to 0.02 or 0.04 inches. However, with the big block V8 it depends on the size of the motor and also the casting number. You can go as far as 060 inches on some blocks, but you need to measure the bore-to-bore spacing first and make sure you can get suitable gaskets.
For a really massive big block engine you can do a lot worse than combine a 4.25 in stroke with the 4.5 in bore to produce a 540 cu in engine. With all the right gear, this size of chevy big block can produce over 800 bhp.
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Posted on: Tuesday, March 31, 2009 at 7:57 pm 
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