TSP Level 2A-R Prototype Specs and testing (Larry's motor)

Cam and bumper, lifters, pushrods, dist gear and $$$..

In the car, the biggest worry would be probably the valve springs. My records on your motor indicate that we used the 1125AL spring set at 125# at an installed height of 1.875.

I would have to grab one of those an see if it could be shimmed to get the required pressure, without going into coil bind. Larry had a set of springs from Greg that I am not familiar with, but they had mean spring rate on them, they set up fairly short, at 1.800 for a flat tappet cam, and then 1.725 for his roller. I was actually surprised they were able to make the pressure without going into coil bind, with that big lift cam.

I am fairly sure I have used that spring on solid lifter cams with similar lifts and the pressures required for the hyd roller, so I don't think that's an issue.

Of course the easiest way is to just yank the heads and intake, and go Larry's route, but that might end up with you knocking on Larry's door for a place to sleep.. :laugh:

Seriously, it might be interesting to do a cam swap like this at one of the national events this summer.. would be cool to have some real world before and after drag strip times, and a wonderful opportunity for a "how to" seminar. We would need a tent to keep the dust clouds at bay, but it's doable.

My Schedule for this year is pretty nuts, but I think I could get away for a weekend for something like this. Something to think about anyways.

You should have sufficient valve clearance for Larry's cam.

You could always take it out of the ragtop and drop it on the wagonmaster later on.

As far as freshening your shortblock again, I am pretty sure this time around that's going to involve some new pistons.. you got about a decade or so on those, it's time to let them go.

JW

 

Jim,
Nice work! Congrats Larry! I wish I had $15,000!
I was at TSP a couple of weeks ago and Jim said to me "This is our new roller cam motor that is going to make 600 horse" Damn good guess! What a beautiful piece of work.
Were all three cams installed at 4* advanced? Would peak HP and torque be brought down a few hundred rpm if installed at 5 or 6 and if so how would it affect idle quality?
I'm mostly wondering because that is likley the 413 I will be using and I don't want to have to rev quite that high for peak hp.

Thanks,

 

Larry, thanks for the quick reply.
At 5000 there is still 30 hp left on the table. I am just wondering if changing the advancing would bring the peak hp rpm down a bit. I am running 70 ported iron heads with a stock 70 bottom end so I am keeping "rpm kills" in mind.
You have a sweet motor that makes killer hp and tq so you don't have to run hi rpm for great performance.
Yards was advised to run his 413 at 6* adv for more bottom end so I am wondering if it applies in my case
I'm no expert so I ask questions to the experts (aka Jim) to get the answers.
Thanks,

 

Hey, Jim, I have a question about the shims under the valve springs here. And bear with me a little because Im pretty green when it comes to this stuff, but are they being used to create a better geometry with the roller rockers or to create more spring pressure (or am I completely missing the point)? I ask because you mentioned something about using .060 locators on my STG1 SE heads with the Comp Cams dual springs and not needing any shims. I guess Im just trying to figure out if I need to factor in different springs/locators/shims should I decide to run a larger cam or use roller rockers in the future.

And thanks for sharing this project with us, guys. Its gonna be a good year for Larry!

 

Matt,

Glad you saw the thread..

On your motor, without the killer alum heads, we are better off to install that cam around 107 or so.. it will give a better idle quality for your Q-jet, and the motor is cylinder head limited, so trying to rev it to the moon doesn't make any sense.

Take note of the degreeing of it in the other thread, as we will have to upgrade to the more expensive chain set to get it installed correctly, due to how it was ground.. figure another $80...

Let me know if you want it, I have other guys who will take it if we go with the smaller cam on yours. I would say it's still a toss up.

Larry,

Haven't made it out to the shop yet, since the dyno session..this illness really knocked me on my butt.. Doctor says I have both a sinus and ear infection.. gave me a bottle of horse pills and told me to take it easy. So I called Brian up and had him dictate the numbers to me..

They are

Intake
.100... 76
.200... 162
.300... 236
.400... 289
.500... 327
.600... 334

Exhaust

.100... 56
.200... 124
.300... 179
.400... 210
.500... 238
.600... 250

JW

 

Brent,

Shimming the springs is simply about pressure, nothing else. Your setup didn't need any extra shim, just the locators.

You can run a bigger hydraulic cam with the springs set up the way they are. You would only have to shim them to a higher pressure if you wanted to run a solid cam, or a hyd roller.

JW

 

Jim,
Hope you have a quick and painless recovery, if not I know a guy who knows a guy who can get horse tranquilizers cheap jk
With the advanced timing I think the 413 will be just fine for me. Consider it sold.
Thanks,

 

Congrats Larry! That is quite the "Can of Whoop Ass"!!!

John:TU:

 

Jim or Larry , what size fuel line and which fuel filter are you using with this engine ?

 

Congrats Larry, looks like you've got a real stout beast there! :beer

 

If you up the resolution, when possible, to 480p or higher, the sound quality does go up. I just listened to it on my little 5.1 i have for my pc and it sounded about like I was standing in the dyno room.


Lovin those numbers Larry, you're makin me jealous!

 

Jim or Larry i was wondering what size intake valve? also Jim, did you not use a girdle because it will stay under 6000. if you plan to shift at 6000 i was wondering where does that put you at thru the traps?

Cody

 

Hi Larry,

Just so you know, Jim should have your new oil pan in his hands by tomorrow or Tuesday at the latest.

Thanks!!

Steve