[Mike S]

After 5 years I freshened up the 455. Went from .040 over to .060. Freshened up the heads also. Machinist ground the intake valve to 38 degrees with out me knowing he did it. I was worried about the change. He told me it would help low lift flow and if performance suffered he would change it back to 45. These are E-heads that flow 330. Only other thing I changed was increase the header primary tube length from 30 to 36.
Yesterday the DA was about +1900. I had 200lbs of ballast in the car. With the old motor it should have ran 10.05. I had a surprised when it went 9.85/135 with a best ever 60' of 1.332.
Now I need a way to slow it up to run my 10.00 index. I was using weight but now need to slow it up with out adding more weight. Any ideas?

I think it's time to step up and make it legal to go 9's. I wonder how fast it would go if I take the weight out and exhaust off in good air.

[Scott65]

9.55-9.65 is my guess. Is a throttle stop legal in your class?

[Scott Roberts]

Originally Posted by Scott65

9.55-9.65 is my guess. Is a throttle stop legal in your class?

I was gonna say .60.. sounds like it's time to detune the car....

[JSchmitz]

Nice problem to have! Maybe take some timing out of it?

[steve25]

With a open tuned header system low lift ( around .200" lift) Intake and Exh air flow numbers are very important to take full advantage of the Cams overlap scaveng tuning as in making high VE numbers !

Put a restrictive 8" air filter on it and sand bags in the trunk!
That latter wil also help you to keep the 60 ft times consistent.

[johnta1]

Just put a stop on the throttle so it will only open so far?
Adjust it till you get your 10 second ET.
Won't affect low RPM or mid RPM 'feel', just the top end limited.

[thebuick]

Who would do such a thing ? He should be locked up and throw away the key for Adding HP. to that poor car

[Lee]

Shift earlier.

[Scott65]

Originally Posted by Lee

Shift earlier.

That can be a good tool. If you know you got treed, you have some extra to try and run them out...

[jimmy daniel]

Shift earlier x2

[Richie Hoffman]

They make a under carbspacer adjustable blades to slow car down

[Richie Hoffman]

Name of company who makes restrictor is Willy’s

[grandam1979]

Could you take a little timing out to slow it up?

[blaktopr]

Maybe a real electrician can show you how to use the electric Greenlee punch kit to make the restrictor plate.

[Half-Inch Stud]

I'd dial-in a throttle limiter to back off from WOT, or drop Total ADV

[Mike S]

No throttle stops or delay boxes allowed. I was looking at the EZ plate system (restrictor plates).They are a little pricy at $490. A lot of index racers are using them. I am going to make a few plates to try under the carb. If I can get it fairly close I can fine tune with weight.
I have been index racing since the class started. Limiting throttle open never worked for me. It doesn't slow you up as you would think. it is not linear. As soon as you get to a point little adjustments are big swings.
I also never had luck with timing.
Keep in mind everything you change, changes your launch thus reaction time.
My car launched great with the power it was making. my lights where .012/.002/.007/.015/.022. Made it five rounds pedaling it each run. lost in the semi's my .022 light to his .014. I ran a 9.990 to his 10.000.

[Scott65]

I would try short shifting it. I believe you could easily get where you need to be. Probably would only have to short low gear. (I'm assuming a 3 speed, I dont know that) My car would scrub 3 tenths leaving it in drive and letting the governor shift it 550 rpms lower than optimal.(both gears) I guess you could mess with cam timing, but that's a pain, especially to go slower...

[Probird]

The couple guys I know that run an index class use the ET Genie. Its about the same price though as the EZ Plate system without the plates. Just turn a screw and it closes off the butterflys.

[Richie Hoffman]

Restrictor plates under carb work great

[adam woodmancy]

The EZ plate guy i'm told is out of business and will not respond to calls or emails, all the reading ive done on the subject points to the willys or et genie as suggested above, im told they are very similar but the e.t. genie has a dial to make it adjustments consistent. I wanted to run the EZ plate setup myself, but ran into the issue i described above. i am in the process of building a new motor, and would like to build it to run a little faster than the old one wide open, however, due to class flexibility, i rarely every run it wide open. i went from a 4.30 to a 3.70 gear to slow it down with the old set-up, i couldn't shift it any lower than i already was (5200). If i need to slow it down even more to run a 7.50/12.00 class, i can unhook the secondaries and kill another few tenths. Ideally i'd like to be able to open it up with the 3.70 gear and be able to dip into the 10's, but most of the time i will be looking to run 7.00/7.35/or 7.50 1/8 index and brackets. That et range gives me lots of options depending on what is paying out (s/pro,pro,sportsman,super e.t., no E, footbrake, and the various index classes and open comps)

oh and, congrats Mike.. thats badass!