Thread:

new relatively stock small block flatbottom circle class

Is there a chance that the final engine specs could be made a sticky or at least placed on the first page of this thread?

I don't wanna scan 50 pages looking.

Anybody gotta link to them?

Thanx

CC

RULE 55 – SPORTSMAN ENTRY (SE) CLASS SE (Sportsman Entry) is an entry level class intended to promote a fun, affordable class with a maximum speed of 85 mph using only GM cast iron small block and cast iron heads derived from passenger or truck model vehicles, and abiding by inboard runabout and safety rules.
55.1 General Rules
55.1.1 A prop shaft release is recommended but not required.
55.1.2 Maximum speed of 85 mph is allowed.
55.1.2.1 Starts may be either clock start or flag start. For flag start lane selection shall be by draw.
55.1.2.2 A GPS may be run in a heat of racing to determine speeds that may require the use of a restrictor plate.
55.1.2.3 Because this is a speed limited class, there shall be no competition or kilo records kept.
55.1.3 Minimum length of an SE hull is 16 feet.
55.1.4 Minimum width of a SE hull is 72 inches.
55.1.5 Hulls under these minimums which competed in an older racing class are to be grandfathered. Contact the Class Chairman for confirmation.
55.1.6 Minimum weight, including driver and safety equipment shall be 1850 pounds weighed immediately after a heat of racing, after draining the hull of water.
55.1.7 If a hull with a safety capsule participates, it must start and race from the outside.
55.1.8 SE boats are to run with only two-bladed propellers.
55.2 Hull Configuration
55.2.1 The hull must conform to the flatbottom hull requirements as specified in the Technical Manual for the Inspection of Racing Runabouts. Non-current hulls which do not conform to these specifications may be exempted by petition to the Class Chairman.
55.2.2 All fins shall be mounted between the chines on the underside of the hull.
55.3 Engine
55.3.1 General Notes
55.3.1.1 No titanium engine parts are allowed.
55.3.2 Block Assembly. Any GM cast iron small block engine block designed for general automotive or truck use may be used.
55.3.3 Bore and Stroke.. Maximum Bore x Stroke is 4.065” x 3.500” 55.3.4 Crankshaft. Any aftermarket crankshaft may be used.
55.3.5 Pistons.
55.3.5.1 Only flat top pistons with valve relief(s) are permitted.
55.3.5.2 Any aftermarket pistons may be used..
55.3.6 Connecting Rods. Any aftermarket steel connecting rods may be used.
55.3.7 Cylinder Heads.
55.3.7.1 Only stock GM cylinder heads with in-line valves.may be used.
55.3.7.2 No porting, polishing, or grinding is permitted in ports or combustion chambers.
55.3.7.3 Heads shall have a maximum intake runner volume of 170 cc
55.3.7.4 Combustion chamber volume using compressed gaskets and deck height shall meet the following values: Compressed Gasket and Deck Height in Inches Minimum Volume in cc’s
(0.085” 64 cc)--- (0.070” 68 cc) -----(0.055” 72 cc) ------(0.040” 76 cc)

55.3.8 Camshaft and Valve Train 55.3.8.1 Camshafts.
55.3.8.1.1 Only flat tappet camshaft and lifters may be used.
55.3.8.1.2 Either hydraulic or mechanical lifters with a maximum diameter of 0.843” may be used.
55.3.8.1.3 Maximum lift, measured at the valve, shal not exceed 0.450”.
55.3.8.2 Timing Chain. Use of any chain set or gear drive of dual idler design only is permitted.
55.3.8.3 Valves.
55.3.8.3.1 All steel or stainless steel valves with a miniimum valve stem diameter of 11/32” with a minimum 0.340/0.341 stem diameter
55.3.8.3.2 Maximum diameter of intake valve is 1.945”
55.3.8.3.3 Maximum diameter of exhaust valve is 1.505”
55.3.8.4 Valve Springs. Valve springs shall have a maximum diameter of 1.260”.
55.3.8.5 Rocker Arms. 55.3.8.5.1 Roller type rocker arms with a maximum ratio of 1.52 may be used.
55.3.8.5.2 Studs and/or guide plates with 5/16” pushrods may be used.
55.3.8.6 Adjusting Nut.. Any adjusting nut may be used.
55.3.9 Intake System
55.3.9.1 Intake Manifold.
55.3.9.1.1 Any production style as cast/as produced iron or aluminum intake manifold may be used
55.3.9.1.2 Sheetmetal or tunnel ram style intake manifolds are expressly prohibited. 55.3.9.2 Other Intake System
55.3.9.2.1 A carburetor spacer is required; it shall have a minimum thickness of 0.500” (including gaskets) and a maximum thickness of 2.25” (including gaskets. The spacer may be wedge shaped, if desired, providing it fits within the above envelope. A restrictor plate, if required, shall be in addition to this thickness.
55.3.9.2.2 The intake manifold may be matched or blended to the carburetor spacer. 55.3.9.2.3 Use of any intake scoop, velocity stack, and/or air cleaner is permitted.
55.3.10 Fuel System
55.3.10.1 Carburetor
55.3.10.1.1 Carburetor is to be a Holley #4776. Only the following dimensions are to be inspected.
55.3.10.1.2 Maximum venturi diameters: Primary/Secondary = 1.265”/1.3275”
55.3.10.1.3 Maximum throttle plate bore is 1.5675”
55.3.10.2 Fuel and Fuel System
55.3.10.2.1 Any pump gas may be used, including E85. See Rule 40.18.12
55.3.10.2.2 Any fuel pump is permitted 55.3.11 Ignition.
55.3.11.1 Ignition system may be either points-type system or HEI system
55.3.11.2 Electronic ignition systems are not permitted. Pertronix distributor points conversions may be used. 55.3.11.3 Any plug wires may be used.
55.3.11.4 Firing order is to be 18436572
55.3.12 Exhaust. 55.3.12.1 Any manifold or steel header with a collecter of the standard straight style may be used
55.3.12.2 No multi-step or 180 degree systems may be used
55.3.13 Lubrication System.
55.3.13.1 A wet sump system with the oil pump mounted in the stock location is required.
55.3.13.2 Any oil pan is permitted
55.3.13.3 Accusump systems are permitted
55.3.14 Other Specifications
55.3.14.1.Any gasket set may be used.
55.3.14.2 Vacuum pumps are not allowed.
55.3.14.3 Use of a heavy duty/SFI flexplate or aluminum flywheel is recommended.
55.4 Class Chairman. 55.4.1 The Class Chairman is Paul Grichar. He may be contacted at pgrichar3@aol.com. 55.4.2 Vice Chair is Dave Weber who may be contacted at billsheliarc@gmail.com 55.4.3 The class shall be directed by the Class Chairman and Vice-Chairman through 31 October 2016. 55.4.4 Rule change proposals for this class shall be submitted to the Class Chairman.

is the choke flap allowed to be removed on spec'd carb?

Originally Posted by 78CoLeBBF

is the choke flap allowed to be removed on spec'd carb?

Yes.
Basically, you have to START with a 8776 and you cannot increase the venturi or throttle blade size. E85 is legal, and you're never going to get E85 to work in a 8776 with simple jet changes.

Originally Posted by gn7

Yes.
Basically, you have to START with a 8776 and you cannot increase the venturi or throttle blade size. E85 is legal, and you're never going to get E85 to work in a 8776 with simple jet changes.

Are we allowed to change air bleed sizes

Originally Posted by 78CoLeBBF

Are we allowed to change air bleed sizes

YES! You can not change the size of the venturi or throttle blades.


55.3.10.1.1 Carburetor is to be a Holley #4776. Only the following dimensions are to be inspected.
55.3.10.1.2 Maximum venturi diameters: Primary/Secondary = 1.265”/1.3275”
55.3.10.1.3 Maximum throttle plate bore is 1.5675”

Originally Posted by Roaddogg 4040

Lookin' good there Tim Sounds like you need to clone yourself of hire some help for the house chores...

Steve

Thanks Steve,
I did just that !! I hired a couple young guys to help me with the house. They start next week. The boat is coming along. The paint turned out pretty good, but it's not exactly the way I had it in my head. The stripping was not supposed to end in the red, but into the white about 4" following the raised arc of the deck seam. Bringing the stripes down the dash was a after thought when I strated taping. Not sure if that was a good idea or not but it is what it is now. I don't know how guys like Billy B and RCL and all the other painters keep all thoes lines in their heads I had so much paper and taping off thing most of the time I didn't know where I was going next or what color to paint. Trying to measure everything with my carpenters rule to keep things even, was about all my old brain could handle !!! Anyway the paint came out very nice, no runs and very little dust for a garage paint job. Some pinstripping, Numbers and lettering and a little buffing and it will be ready for the first bounce off the dock or someone in the first turn. Tim

Originally Posted by Roaddogg 4040

Now you are cooking with gas! Great idea getting help with the house chores Tim. As far and painting goes, I bet that you now understand how painters like Rattle Can and Billy B can charge the outrageous prices like $300, $400 and sometimes even $500 for some of the paint jobs that they do Seriously Tim, I can't figure out how they even begin to figure out how they do the incredible work that they do. My painting talents end with the spray painting of the old rusty patio furniture that I do

Rosie and I have just finished getting the apartment in my shop prepped for the kids and the grand kids visit in July so you and Carol will have a place to stay when you come out for the races this fall... Oh, Rosie just told me to let you know that this apartment is nothing like our Cottage that you stayed at in Michigan. This one even has Heat and A/C, full kitchen, laundry, indoor plumbing etc

Steve

Steve,
Thoes are outrages $$$'s but I do have a much better understanding why they get up to $500.00 for a paint job !!! I wanted to paint the boat with PPG GM white dimonds untill I found out it was a several stage paint and a gallon to the stuff was $750.00. After talking to the guy for awhile he told me about a 25gram bag of white sparkle pearl pigment some guys were using in the clear coat. I decided to give it a try so I ordered 2 bags of it. Directions said to use 1 bag per gallon of clear. I got out my old trusty Sharp paint gun(probably hasn't been used in 10 years) and decided maybe it was time to buy one of the new gravity guns. Back to the paint store to buy a new gun. Talked to the guy a little more about the pigment and he told me after I spray clear with the pigment, to go over it again with just the clear( I've never painted with base coat/clear just old single stage). I did just that and cannot believe how good it looks. The white looks every bit as good as the white dimonds if not better and it turned the red and black into candy colors. In the sun it's unbelievable and it has not even been washed. I started this project to learn how to flow coat(With advice from RCL thank-you) and paint to restore my Biesemeyer. I've made mistakes but have a much better Idea what to do and what not to do. I can't wait to start the Biesemeyer restoration. I was going to sell this one once the Biesemeyer and Starfire were done but I think I might just keep it and use it for a river boat. Steve, There was nothing wrong with your cottage in Mich. I'd stay there anytime. When is the Fall race ? Tim

Originally Posted by Roaddogg 4040

As far and painting goes, I bet that you now understand how painters like Rattle Can and Billy B can charge the outrageous prices like $300, $400 and sometimes even $500 for some of the paint jobs that they do

Steve

RCL never got 300.00 for one of those paint jobs he does with a garden sprayer.
With Billy's 500.00 include the cool logo