Race numbers & names...

[gn7]

SS, pretty much a spec engine. 440 max cubic inches big block Chevy only
18ft max length flat bottom approx. 1850 lbs with driver
Specified manufacture for piston, manifold, and heads as manufactured zero modifications
spec gasoline
Single Carb limited by the throttle blade size but open to any modification.
Flat tappet camshaft,
steel connecting rods of the stock length.
Max 4.320 bore, stock 3.766 stroke Limited manufactures allowed for crankshaft
wet sump oil system with oil pump in the pan

Pro Stock:
500 cubic inches, any make production type, iron block, aftermarket OK, no overhead camshaft
Unlimited modifications unlimited carburation or fuel injection, no blowers
methanol alcohol or any gasoline
18 max length flat bottom 1850 lbs minimum weight with driver

K boat
open cockpit: 470 cubic inch limit 8-71 blower
capsuled: unlimited inches unlimited blower
any engine production type, iron block, no overhead camshaft
Unlimited engine modification
18ft flat with special rules for boats up to 21 ft. Minimum weight 2250 lbs. with driver for 18ft, 2400 for 21ft hull

GN
470 cubes for blown engines 525 cubes for unblown engines
any make engine production type, iron block, aftermarket OK
8-71 blower with 3% limited to 3% overdrive
any carburation or injection
unlimited engine modification any oil system
any gasoline or E85
25 ft max, no weight requirement but most weigh in the excess 2500 lbs no driver

All of the above must have rear engine driven thru a v drive to a prop under the boat.

APBA Crackerbox
Probably get some of this wrong
13.5 to 15.5 length with some pretty strict dimensions laidout in the rule book
Minimum weight???
314 cubes iron block based on production engine. aftermarket OK
No overhead camshaft
650 cfm carb with virtually no modifications allowed
unlimited engine modifications
direct drive, no v drive or gear box
gasoline
Note: there is a alternative 275 cube engine that is allowed methanol and fuel injection, but nobody I know of uses the alternative engine today.

Cracker Pro (Lucas Races)
Pretty much the same as above. You would have to ask Andrew about any differences.

EDIT for minimum weight corrections

[hbchgirl]

SS, pretty much a spec engine. 440 max cubic inches big block Chevy only
18ft max length flat bottom approx. 1600 lbs with driver
Specified manufacture for piston, manifold, and heads as manufactured zero modifications
spec gasoline
Single Carb limited by the throttle blade size but open to any modification.
Flat tappet camshaft,
steel connecting rods of the stock length.
Max 4.320 bore, stock 3.766 stroke Limited manufactures allowed for crankshaft
wet sump oil system with oil pump in the pan

Pro Stock:
500 cubic inches, any make production type, iron block, aftermarket OK, no overhead camshaft
Unlimited modifications unlimited carburation or fuel injection, no blowers
methanol alcohol or any gasoline
18 max length flat bottom 1600 lbs minimum weight with driver

K boat
open cockpit: 470 cubic inch limit 8-71 blower
capsuled: unlimited inches unlimited blower
any engine production type, iron block, no overhead camshaft
Unlimited engine modification
18ft flat with special rules for boats up to 21 ft. Minimum weight 1800 lbs. with driver

GN
470 cubes for blown engines 525 cubes for unblown engines
any make engine production type, iron block, aftermarket OK
8-71 blower with 3% limited to 3% overdrive
any carburation or injection
unlimited engine modification any oil system
any gasoline or E85
25 ft max, no weight requirement but most weigh in the excess 2500 lbs no driver

All of the above must have rear engine driven thru a v drive to a prop under the boat.

APBA Crackerbox
Probably get some of this wrong
13.5 to 15.5 length with some pretty strict dimensions laidout in the rule book
Minimum weight???
314 cubes iron block based on production engine. aftermarket OK
No overhead camshaft
650 cfm carb with virtually no modifications allowed
unlimited engine modifications
direct drive, no v drive or gear box
gasoline
Note: there is a alternative 275 cube engine that is allowed methanol and fuel injection, but nobody I know of uses the alternative engine today.

Cracker Pro (Lucas Races)
Pretty much the same as above. You would have to ask Andrew about any differences.

WOW!!! Thanks gn7!

[28eliminator]

Makes a little more sense now.. Thanks Bob.


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[gn7]

Heres something to consider about the above rules. Look at the differences between SS and PS, and then consider that the top running SS run well enough to usually beat most of the PS boats, and have won the PS championship numerous times. In fact the PS championship this year will go to a legal SS boat. Those SS guys have their shit together.

[Mitch]

GN7 KM "unlimited marathon" , was that not the last class name before GN ? Or was that a different group ?

[WESTERNAERO]

Heres something to consider about the above rules. Look at the differences between SS and PS, and then consider that the top running SS run well enough to usually beat most of the PS boats, and have won the PS championship numerous times. In fact the PS championship this year will go to a legal SS boat. Those SS guys have their shit together.

Isn't that generally the case with most "limited engine mod" racing? The guys restricted need to learn the finite ways of making power. And the unlimited guys just buy the best off the shelf parts and expect to make big power. Plus there is a lot of power to be made up in rotating weight of everything. Maybe the SS guys have a better handle on this idea.

[Sharp shooter]

GN7 KM "unlimited marathon" , was that not the last class name before GN ? Or was that a different group ?

Ya Bob, what gives? No love for KM?

And since the subject on numbers and classes is rolling here, I'd like to point out that many classes have went away. If you see a boat with PC, SK, E etc. The boat possibly raced those classes before the classes disappeared but the letters weren't removed.

Another thing were club letteres. For example DB stood for Desert Boat and ski club and there were many clubs in the 60's.

[Sharp shooter]

Isn't that generally the case with most "limited engine mod" racing? The guys restricted need to learn the finite ways of making power. And the unlimited guys just buy the best off the shelf parts and expect to make big power. Plus there is a lot of power to be made up in rotating weight of everything. Maybe the SS guys have a better handle on this idea.

My humble view concerning the SS vs PS debate is multi faceted.

First, the popularity of the ss class brought in some big money teams in the late 90's. The competition was on a heightened level. The top 3 or 4 teams would spare no expense and experiment with a wide variety of rigging, hull and propeller technologies that hadn't been explored before. Because of this (and some great drivers) the boats and the class excelled.

At the same time, ps became the step child class. I'd even venture to say that ps was a better starter class than ss at one time (before the 80mph nostalgia class took hold). With the less restrictive rules, the performance potential is higher in ps but rarely would you see a boat in that class utilizing every means available to push the limits of the class and driver skill also plays a huge part.

IMO, if Gordon Jennings and David Rankin were to focus as much effort on a PS boat as they do on SS-80 it would never loose to a Super Stock boat unless the drivers were unparalleled.

[WESTERNAERO]

My humble view concerning the SS vs PS debate is multi faceted.

First, the popularity of the ss class brought in some big money teams in the late 90's. The competition was on a heightened level. The top 3 or 4 teams would spare no expense and experiment with a wide variety of rigging, hull and propeller technologies that hadn't been explored before. Because of this (and some great drivers) the boats and the class excelled.

At the same time, ps became the step child class. I'd even venture to say that ps was a better starter class than ss at one time (before the 80mph nostalgia class took hold). With the less restrictive rules, the performance potential is higher in ps but rarely would you see a boat in that class utilizing every means available to push the limits of the class and driver skill also plays a huge part.

IMO, if Gordon Jennings and David Rankin were to focus as much effort on a PS boat as they do on SS-80 it would never loose to a Super Stock boat unless the drivers were unparalleled.

That's interesting, I didn't know there was an ongoing debate about this. I go to long beach every year to watch and that's about all I know about the circle boats.
However, what Bob was saying reminds me of almost all roundy-round racing. And to your point, I think a lot of racers enjoy the more limited classes because of the competitive nature of it. I would guess the SS boats have 20 times the money, time and experience invested than the PS.

[rivergames]

Hey Bob, I beleive the "P" stand for Pacifc