Could you share those FAST legal upgrades that would be worth .10?

Sure. Learn to cheat better. I could tell you but then everyone would know.

It would help if those posting would give enough info when starting a post. I didn’t see this was a FAST engine type build till you mentioned it. Must be top secret. Lol.

Well, you’re allowed to do pretty much anything you want that doesn’t show.

It’s straight up heads up racing....... so whatever else you did...... if you left a tenth on the table by not using a different cam....... it’s still there for the taking.
Maybe the guy next to you didn’t leave it on the table.

But...... I agree that when you're asking for advice for things pertaining to running that class, it’s best to mention it right at the start, since there are things that work for other types of builds that don’t work for FAST type builds.

I did say "all out stock appearing build". Car is being built to run in the SuperCar series, but besides that and FAST I'm unaware of what else that could mean.

Bill

Since you are traction limited I'd think the power difference matters less than the shape of the torque curve. And a roller cam would give you more control over the shape of the torque curve since you can get a lot more creative with the lobe shape. So if it was me, I'd start with a roller cam and never even bother using a flat tappet. I'm not saying it is going to be easy to find the best torque curve to match your chassis and your driving style, but with a roller cam it will be a lot easier to make adjustments.

I cannot tell you how much you would gain. Probably not much if you are keeping identical advertised and 0.050" numbers you have with the Scott Brown cam. A roller isn't going to move the valve much faster than that. Is the 0.200" duration above 165°?

Are you in an all out chase for the top spot relative to the "other" cast iron 4bbl intake BBMs in FAST and SC?

If so, I would probably suggest something like this order:
1) Make the intake the very best you can within your skill set/budget.
2) Install and go to the track and test with the cam you have now.
3) Then after establishing a solid baseline corrected to std conditions, then start changing testing and recording the results of the following for the cam you have now:
a) increase and decrease lash 0.004" on the intake.Keep going until it slows down
b) then do the same on the exhaust
c) then advance and retard the cam in 3° increments.
4) Read the tea leaves from the data and extrapolate your findings to spec youself a solid roller from what you've learned picking lobes that move the valve as fast as possible. Your valvetrain will hate you.

If you have not done this already, you might find a tenth or two and a mph or two with the cam you have.

Or call Dwyane and have a conversation.

Roller is the way to go.... Hands down...

Obviously only one way to know for sure....... but......

Based on my assumption of what that cam is, I’d say it’s 165.

Bill can say if this is right or not, but I think he’s running 1.6 rockers too.



Well...... yes..... and no.
But I’m not going to get into any details....... also, as you say, there’s several ways to go about it.
And...... obviously that cam is working pretty well in Bills car.

1.6 is what the card says. Looks like they are 6583/7396 lobes.

From what I understand, the cam was in a different motor originally.
That motor did have 1.6’s........ I don’t know if Bills are or not.

Those are what I assumed the lobes are as well.

Here you go. My buddy spent 800.00 on carted gears and ceramic bearings and picked up .30 in his 11 second car.
http://microblueracing.com/?fbclid=IwAR17jjdtsHqPgR_JlUC2sLe0Z2RDf_9d04F2I5icDDg3B7mk__Zxi5dHDrU

Untitled by cudadude2, on Flickr

Untitled by cudadude2, on Flickr

Untitled by cudadude2, on Flickr


Untitled by cudadude2, on Flickr
This is the intake that I'm currently using on my 451. I have a much improved one that I'm building now with an even better one planned after that if I continue to try to compete with an iron 4 Bbl. That one will require professional help and I prefer to keep my stuff my stuff.

My rockers are HS 1.6's.

Bill

change those rear tires to drag radials or slicks and you will improve even more. LOL.

what are your cylinder heads like???

Not really relevant to the cam question....... but compression is your friend in these classes....... up to a point.

Not legal for my race classes. Have tried them on test and tunes and didn’t see any improvements. Car is designed to work on the little tires.

B

Better than my intake. Medium porting. Big valves.

Thinking 13:1.

B

Your car already has 60’ times better than the two quickest single 4bbl “383’s” in those classes.

With a 13:1 499 under the hood...... if you can keep the 60’ as good as it is currently, you should be able to go after the top spot.

It’s too bad Jim doesn’t bring the Dart out anymore......... there was a bunch of untapped potential with his car.

A little rivalry makes it interesting.