Re: OLD Modified Corvettes
 

Dick,
I agree with you on keeping cranks from getting crazy,alum rod I don't see as issue,a good high quality steel rod cost more than alum rod does,so don't see it as money issue,personally if this class existed,and I was'nt allowed alum. rod I would probaly spend $300-500 more on steel rods I would trust @RPM I would be cranking.
Randy,
Stud mounted rockers vs.shaft are toss up, if starting with nothing cost is not much different,on these engines shafts would not be expensive,first off no offsets would be need so that cost less. Shafts are easier to get on engine like we are talking about if has long valves ,stud mounted have to buy $400.00 ish rocker that has clearance for anything over 1.500 spring or clearance some that cost 250 ish then add 75ish for best arp stud,150-250 for stud girdle,you are right at shaft price.

One thing that could be possibly good ideal is limit lift @ valve to .630-.660 lift that eliminates reason for having valves over .100 longer,don't need all the extra installed height to get springs on heads that will work with bigger lifts,and that eliminates problems of getting rockers to work. If you ever have put .200-.300 longer valves in sbc w/stud rockers you know what I talking about,as rocker is higher up stud,pushrods get longer, rocker body gets closer to retainers,roller gets moved to outside tip of valve,this also happen on shafts,but all you do is get set of stands that moves rocker back toward intake,and has material added to bottom of stand so you don't need .150'' worth of shims.

Also if shafts was allowed that would be level for all three brands on valvetrains.
All rules look good to me,I would maybe add if not covered,material, bore spacing,deck height, maybe say deck has to be 9.00-9.500 that will cover sbc,mopar,and ford,or some how keep short deck exotic stuff out. I know this elimnates 8.200 (302) based windsor,but it's is probaly too short and could give advantage of lighter rotating assm to that combo over the others.
Mike Taylor 3601

Re: OLD Modified Corvettes
 

Mike, I actually agree with all your points. I spent $2,600 on a set of steel rods, and I actually think aluminum rods are easier on parts. I love shaft rockers. I just didn't want people to think this is just about me. Blocks, a very good point made. Min. Deck, say 9". Cams, name your poison. I'm game for anything. Cranks, again, whatever works for me just so we make tear down easy.

Re: OLD Modified Corvettes
 

I agree.

Re: OLD Modified Corvettes
 

We have limited the air intake to 750 cfm, and the exhaust to 2" primaries.

Re: OLD Modified Corvettes
 

Why don't you use the old C/Super Mod rules from the 70's when it was introduced.
no porting, any lower end. at the time over the counter manifold. 750 carb. no big tires, etc., etc..

Bob Lasko
one of the original SS/CS or C/SM people.

Re: OLD Modified Corvettes
 

Bob, I actually have applied some of the rules from the old C\SM, and SS\CS. I never ran C\SM, but ran SS\CS for years, and ran D\EM, and C\EM IHRA. We weren't going to allow any porting on the Brodix spec head, and about the only difference is the tire size. The classes are close to the same, and might be interesting. The head potential is almost identical. As of now it's just an idea, nothing more.

Re: OLD Modified Corvettes
 

The old C/SM head rules were cheaper than a set of Brodix heads. Had to be production iron heads. Stock valve stem size, only 1" below the valve seats, 1/2" back from the intake gasket surface to match the manifold. No welding or epoxy. We had more C/SM cars in class at Indy than in SS eliminator at many races today. Guys that liked to write big checks were no faster than guys with a clue what they were doing. You can hide more work in aluminium heads than iron. With the 1970s C/SM head rules there was no reason to send anything to Brodix, or anybody else, for verication.

Re: OLD Modified Corvettes
 

I am assuming this thread is just off season fantasy stuff but OK, I'll bite. You realize that any one of several Comp racers would make a mockery of this in no time. This will instantly turn into a $100,000 car class dominated by a handful of racers. How much fun do you plan to have when you get your butt kicked in the first round every week? Stock has very restrictive rules, look how cheap they are to build. So how do you intend to enforce a 'must clutch' on the shifts rule? Is a tech official going to ride along or do you have to download your GoPro after every run? Sorry to ruin your fun, please procede with your fantasy of believing there is a way to devolve racing back to the 70's.

Re: OLD Modified Corvettes
 

Good job on establishing a baseline set of rules. That was something even I could understand.

Want to address Caughlin's infinite money Comp-racer issue? Refer to prior post: Restrict the air intake and exhaust. What you've done is a start, but consider what you could do that would be easily policed that would substantially mitigate the effects of people spending massive money on anything... whether it be highly modified carburetors, doctored cylinder heads, etc.

There's actually an interesting solution devised by a mad scientist racer many years ago. I did extensive computer modeling on it, and it works ridiculously well, despite (or perhaps because) it being very simple.

Re: OLD Modified Corvettes
 

Michael. I'll bite. Anything that works. Jim. I doubt very much even a comp racer could fool the manufacturer with all the computer controlled design today. Get real. Super mod evolved to where it is today because of innovative racers that at that time, were tough to catch. Today, not so much. I know a guy at Brodix that said "Bring em on, we'll decide who's smarter." On the clutching every gear thingy. Let me respond. At our track, if anyone was suspected of shifting without a clutch, a protest fee was paid, then the car under protest was required to make up to 3 runs, backing up his other runs that night within .02 in the 1\8th, and .01 in the first 60' with, now hear me out, a roll cage mounted camera recording the left foot. What do you know, it worked. I still have the camera. I was going to get more detailed later. I was just throwing options out there. I think going back to actually driving a race car would be far more interesting. By the way, no one has to send their head to Brodix unless they are under protest. Surely the comp guys, ( who I have the utmost respect for) don't need to cheat to beat a bunch of redneck hillbillies. I welcome the challenge, thank you.