74 T-top, L-48, 4spd, A/C, narly blue. Goodwrench 350 underwent new heads (SR Torquers), Schneider solid cam and Thorley headers. Now runs a Performer Air Gap with a lars majic chokeless Qjet on top. Also Street dampner, MSD dist, 6AL and Baster II.
http://members.cardomain.com/cardo0 What et does this car run?

 

Why would anyone run a solid cam on a Goodwrench engine?

 

Ok , vac ports in the back of HSR. Got it. Thx Gregg.

 

thanks cardo0, found the link info on plexiglass, will try to get accurate readings. Getting it dirty is half the fun.

 

I think he lost his train of thought. SR cam = superram NOT Solid roller.

That is my interpretation and could be wrong.

 

I don't want to hijack this thread, but can you link to a source that discusses how to do this?

 

The OP may add to this but there was a company (USM) making modified HSRs several years ago. Member "Bjankuski" owns one IIRC.

At the time they started business, there was a group purchase proposed. I don't remember if anyone (else) tried/bought one, but here is a link to that thread (in case, there's discussion of the design).
https://www.corvetteforum.com/forums...m-l98-lt1.html

I also Googled "USM HSR intake images" to see if pics still exist from the defunct website....or at least from someone who's modified an HSR. Here are a couple of the images I found:






Considering the ingenuity of people willing to "make" their own intakes, the options for making an HSR fit aren't likely to be limited to one method. Having SAID that, if you "chop" the plenum and make it shallower, you'll affect "air supply" to the runners. (Lingenfelter understood this when designed the Super Ram.)

In the pics, you'll see USM (and others) cut open the bottom of the plenum (using a trace outline of the top of the base). Then they chop off the runner "extensions" (extending up from the base) at an angle. Finally, they weld the two pieces resulting in a plenum that angles downward toward the front of the intake.

With the plenum "floor" angled, you might wonder if better penetration of air is achieved in front runners. ("Ram Air" style intakes typically have more air "rammed" into the rear runners.) You also have to wonder how reversion is affected.

The HSR is considered somewhat more desired than a miniram because it's runners are closer to an LSx intake. (Yes, people recognize there's some advantage in capturing reversion -- especially if it can be done at an "ideal" tq/hp peak where power roll-off doesn't "waste" rpm limitation of the engine.) With varying runner lengths, rear cylinders will "peak" a bit lower than the fronts...but they also tend to get more air anyway. The result might not be "bad". Plus, some builders LIKE the idea of varying how individual cylinders perform.

Hopefully, this information adds inside into what the OP is attempting to accomplish.


Edit: If you have the welding skills/shop, you COULD buy a CHEAPER HSR and chop it EQUALLY front/rear. Basically, you'd have a miniram for less money. Also...I probably could have found more pictures were it not for photobucket. (We can't diss them enough!!! )

 

This mirrors my plans to convert a dual plane carburetor intake to EFI. Mostly for modest cammed street motors it should boost torque below mid-range and you can also include an EGR pad for emissions concerns. It does take an intake elbow and accurate location of the injector bosses. I obtained a converted TPI plenum already but intake elbows are available on the shelf now if desired. I think you would match a dual plane intake conversion to a street performance vehicle rather than a serious race effort. But it could be a very good substitute for a TPI motor/intake.

 

I have the USM modified HSR but never got around to fitting it, can post pictures if required.
Just need to find it in my shed somewhere.

 

Hi Aaron !!

I am still around playing with vettes.... albeit a C6 these days. I race most weekends at the track. I fly by in here from time to time.

I'm looking to pick-up a C4 in the coming months and building something with it.... more of a dedicated racecar than anything.

Still trying to figure out the plan though... it's complicated with the race series I am interested in right now.

 

Hi Greg,

Well, the OP did say just 12.20.... which you can do with a 383 with a stock tube runners, let alone a HSR, SR or MR or whatever.

Whatever he chooses, I wish him well.

 

Good to hear from you. It seems that most of us older guys from the early days have acquired newer model Vettes. What series are you intending to race with the C4?


I wound up taking my old C4 very deep 9s in the mid 2000s, and got perma-banned from my local track due to lack of safety equipment (only a hoop in the 87 vert). It is still street legal, so never intended to do a full cage.


I have a C6 that I wound up doing a bunch of work and is TT. Love that car, but never could get the times that I wanted. I recently bought a C7Z07 and have started acquiring mod parts for that.


I live overseas and only get time to play when I am in the States. I hope to end the ex-pat assignment and return home soon, so maybe a chance then.


I did give my other C4 to my oldest son (2nd son loves his Supra Turbo) and he is running that with many of my old parts (big TPIS cam, my old worked LPE heads, single plane intake, 3.45D44, ect). The "stripper" vette weighs right at 2800lbs and runs strong. He seems to like it!


Anyways, it is always good catching up with old friends on this forum. Cheers!
Aaron

 

I've thought about the new C7Z06.... have a few friends who have them. Friend in his C7Z A8 just ran 10.9 @ 127 mph bone stock in decent air. Very cool car. Last week at the 1/8th he was running 7.00x..... he's after a 6 second timeslip.

I bought a C6 Z06 years back.... intended to leave it stock, but didn't work out. Now a 442 LS7 with an Auto conversion. Run's easy 9 second times on motor, but I mostly race 1/8th where it runs low 6's. Been a fun car... I race some Prep and No-Prep events mostly in the index classes.

What I am considering for a C4 is a True Street project... or Outlaw True Street. I am already involved with them.... most of my friends race in one other other. Problem is, the classes are evolving fast and a lot of talk about rule changes... not sure where it is going. 2 years ago, if you had a 5.50 car you were a player..... now if you have a 5.50 car, there are fist fights in the lanes trying to get next to you, cuz you're the duck.

As of this year, the fastest guys are running 4.80's at over 150 mph. This is just in 2 years of evolution.... imagine it in another year or two. So I don't know yet. I'd at least like the class to slow down so I know a number I'd have to run to be competitive. We'll see.

Hope you can get back to the State permanently soon.... there is racing to be done.

 

Thats the road i am taking Beach Bum.I have a 80 model vette also for racing

 

https://www.corvetteforum.com/forums...ification.html















GREAT WORK JOBY

 

Thanks for that link. Just to let everyone know, I think a bracket or closure of the url tag got left out, and the link is mixed together with a photo link. The full link is: https://www.corvetteforum.com/forums...ification.html.

Now I have some evening reading to do!

 

Yeah...the link closing tag got buried in the IMG tag. Matt beat me to the fix.



Street89Vette: I'll be curious what you use for a distributor