Why 410 cu in?
 

How did sprint car racing decide on 410 for cubic inch limit? When did this come about?

Cause the pa posse was kicking tail with big blocks,,some were steel crate blocks with factory aluminum heads,different cam add injectors and a motor the could run almost all season with maybe a bearing check half way in the season and the Woo couldn't control it when they raced there ,they were the first series to have a 410 rule and everyone just follow after that , If I remember correctly

Re: Why 410 cu in?
 

Bobby Layne from Kansas City also ran a big block sprint until the WoO told him no more

Re: Why 410 cu in?
 

As far as the “when” I believe it was around 1985 when the World of Outlaws went with the 410 standard and other tracks and series followed suit. As was mentioned, the flash point was out East. Big blocks had been legal at the Pennsylvania tracks. Things started to get out of hand when some of the better funded PA teams, such as Al Hamilton’s, started using higher dollar all-aluminum Rodeck engines that checked in at over 500 cubes. It’s a shame that the big blocks were legislated out of the sport. A lot of inventory was made obsolete. Those old big blocks sounded great too!

Re: Why 410 cu in?
 

So what I am hearing if a prominent group develops a good rule that works well for them other groups will follow also just because it is a good rule and makes sense to them also, kind of like lead by example. That is a very good IDEA.

I do kind of miss the old big blocks.

Honest Dad himself:6::6:

Re: Why 410 cu in?
 

Originally Posted by DAD:
So what I am hearing if a prominent group develops a good rule that works well for them other groups will follow also just because it is a good rule and makes sense to them also, kind of like lead by example. That is a very good IDEA.

I do kind of miss the old big blocks.

Honest Dad himself:6::6:

If only it was that simple.

I was lucky enough to watch those big blocks scream down the frontstretch at Port Royal and Williams Grove.

Re: Why 410 cu in?
 

Originally Posted by fasster23:
How did sprint car racing decide on 410 for cubic inch limit? When did this come about?

I'll attempt to answer.

A lot of people were using Chevy 400 cast iron small blocks.

The 400 Chevy had a bore size as 4 1/8" and a crank stroke size of 3 3/4"

The largest you could safely bore the stock Chevy block was .060 oversize making 408 cubic inches.

To include the growing popularity of Aluminum blocks and to keep the iron blocks competitive they settled on 410 cubic inches. Most teams using an aluminum block then were staying with the Chevy bore size of 4 1/8" and increasing the stroke size to 4 7/8" to make it exactly 410 cubic inches

Not a good explanation I know but on just my first energy drink this morning.


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Re: Why 410 cu in?
 

Turn your Sub-Woofer up to No.10 and enjoy :6:


Warm Up - https://www.youtube.com/watch?v=0qFti5cuWtQ


Racing - https://www.youtube.com/watch?v=16S9KBXH0uM

Re: Why 410 cu in?
 

Take out the S in the https when posting videos from youtube. Little trick Bill Taught me.

You Tube Video

The old 22. Big bertha, I think it was called was fun to watch.