I am not all to satisfied with the performance of my current power plant and wanted to ask you guy for some input.

It's a .030 over 350 and it was not decked.
The pistons are hypereutectic -6cc but I forgot who made them. I think the rods are standard length.
The heads are standard issue 64cc Performer RPM's
I think the cam is a lunati bracketmaster II
part number 638-00010LK
Adv. Duration: 292°/292°
Gross Lift: .480''/.480''
RPM Range: 2000-6000.
I think compression came in right around 10:1.
Performer RPM manifold and 750 demon carb.

I am running 3.08 gears, 2500 stall, 275/40r17 tires, th400 trans.
Car weighs around 3450 with me in it.

Right now I am running mid 14s at around 98 mph. This is at LACR so it would be a bit faster at lower altitude, but I race at LACR so that is not all that relevant.

What sort of improvement can I get out of my existing setup and still be ok for traffic on the 405?

Should I just go for a 383?

Changing the rear gear is not really an option as I already see 4500rpms for far too much of my commute. Remember the rear tires are short due to their low profile.

I have also been considering a holley commander for improved driveability and being a big computer nerd I just like the idea of merging the two. I am also considering just going to a 650cfm carb.

4500 rpm with 3.08s? What's the speed limit on the 405, 150mph??

I'd do a cam swap. That old 292/.480 design never impressed me, a friend of mine ran one in a 350 years ago in a Monte with the same gears as you. With the 3.08 gear your car will like more midrange torque. Lunati's newer grinds are probably much better. Heck, even a Comp XE268 would make the car pull much better IMO. The rest of the combo looks great I think, I assume the car has headers. JMO here, Bob

Harolds's 280º cam would probably do the trick. I don't know the specs but it is quite popular and someone may pop in with them and a part number. It's one of his Ultradyne cams, now Lunati. I think a 268 is a bit on the small side for your CR. A 272 cam would work excellent and is as small as I would go (the 280 is about the largest). I don't know what Harold has in that size.

As for tires, and you probably know this. Get some more side wall and a 15" wheel for the strip. Your ET's will thank you.

Yes, you 292/230, .480" lift cam is a dog down low b/c I had one like it was in my about 9.5 to 1 CR, 406 SB with an M-20, 3.31 gears and 26.5" tall tires until she was up above 2500 rpm..

Been there, done that..

Pat, how about Cranes 274H06 hy-cam??? I would think it should be explosive in the midrange in his motor!!

pdq67

I am running Dougs tri-y design.

I have seen the huge difference that the 15" tires make, but most of the time I can't convince myself to get out the jack and change the tires before I run off the the dragstrip. I usually do see a couple of 10ths when I do swap.

I am also running 1.5 ratio rockers.

I am new to engine combinations, but it seems like what you guys are telling me is that I want a cam with less duration. Would adding lift also be desireable?

And 4500rpms is no where near 150, maybe a touch over 100.

PDQ, that cam has a 106 LSA. That pushes the DCR pretty high. Installed with one degree advance it would work (8.29 DCR, 62º ABDC intake closing). With anymore advance it closes the intake too soon for a driver on pump gas. Closing any sooner that 62º makes it iffy for pump gas (8.29 DCR). The 106º LSA would build a bunch of mid-range torque.

Adding lift helps build torque. That's the secret of a roller cam. You could put 1.6 rockers on the intakes for a bit more power.

your hypers may have your pistons down in the hole another .020..making your CR around 9.2-1. Be conserevative on the cam(unless your sure of the CR) After just building a new engine(and CC'ing everything) the advertised CC numbers are not very accurate. I myself would not run another hydraulic cam. Solid atleast..solid roller if it sees much track time. The xs268 solid or xe268 hydraulic would work well (IM0)

Well, I am a solid cam guy but I was staying away from mentioning them here!!

But you are right, a solid will make more power everywhere but you also have to lash it periodically..

But to me, lashing is no big deal...

pdq67

PS., and thanks for the come back Pat, I figured the 274H06 would be explosive if his DCR wasn't too high, but I figure it is a schosh lower then thought like always unless "measured to the nuts"...

The compression ratio is certainly "negotiable." I am not afraid or lashing the valves once and again, and I really love the pure mechanical sound of a solid lifter setup.

So let me summarize what I have so far.

Run a cam with less duration, 1.6 rockers on the intake, pay attention to the DCR to remain pump gas friendly.

My target for the car is to be able to get through the traps and 102 mph. Is this a reasonable goal?
I want to do it with my street tires and keep the car driveable. Maybe I am being a little too ambitious and need to consider some more displacement.

Thanks for all the advice.

That covers it. I don't think you'll have any problem reaching your goal. When looking at the DCR it is best to stay on the safe side. Unless you have measured eveything, these numbers are guesses at best. When I calculated the DCR I used a .040" quench. If it is different the DCR will be different.

How "negotiable" is the CR? I get 10.14 as is. Not too shabby. You would need to mill the heads or change pistons. Do able but not very convenient. Probably need different length pushrods. All this adds up.

If you want a better time slip, run over to Irwindale on a Thursday night. Only an 1/8 mile but you'll hook better and 1/8 mile better than LACR.