Still waiting on my Vortec HSR through Thunder Racing... Was wondering what people here thought of my [soon-to-be] combo...

Vortec HSR with 58mm Holley TB, and new 24lbs Holley Fuel Injectors
Heads are E-Tec 200's
Comp Cams 268XFI Roller CamComp Cams 26986 Beehive Springs, Comp Magnum Roller-Tip Rockers

I've already got the Cam, rockers, springs installed, and it runs pretty good with the current intake (SDPC base, Edelbrock Runners), but I feel like it has a lot left to be unleashed. (btw, motor is a 350 with stock bottom end).

I ordered the HSR on May 27th (its still on backorder from Holley), so I thought I'd post here in the mean-time to satisfy some curiosities. Anyone else have a similar combo??

 

I was wondering if you have any dyno numbers or track times with your current setup. also are the vortec heads stock with those spings installed or did you have to have the heads machined to get those springs to fit. i have a set of stock vortec heads that i want to install on my car but i am still trying to decide between the sdpc base or a stealth ram. also do you want to sell your sdpc base when you install the stealth ram? i am interested. how do you like that cam, i am also looking at that same cam. how is idle/power range ect. any of these questions you can answer would be greatly appreciated. thanks

 

I am also curious, any track times to see what is does with the current setup. I would like to see the before and after the HSR intake with this setup.

 

your cams abit small.... not a bad cam tho, u could get more wit a larger cam
bc ur heads are gona flowwwww alot bc its a 350 so those heads are gona need more RPM to take advantage of there large 200cc runners. your cam and those heads are lil missmatched... more duration will give u more power bc the heads/intake are gona flow alot more and increase your RPM range. also your TB is probably too much for your motor, unless your spinning 7000 rpms that 58mm TB is too much for your 350, and u would prob gain alil HP/throttle response with a 52mm (flows 900cfm) i went with a 58mm TB bc im goin wit a 383 and i need the air otherwise i would get the 52mm in your case
im going wit
HSR383
30# SVO injectors
58mm professional products TB
195cc patriot heads
comp cams XFI280 cam 230/236 .567/.571 lift 113 lobe
1.6 extruded full roller aluminum roller rockers
im hoping for peak HP at 6000rpms and i matched them to the intake/heads/cam

 

I agree that the 58MM throttle body is too much.. But, a bigger displacement engine is in the future at some point, and the HSR is (from what I've read) matched with 58mm bores. I was thinking about getting the 280XFI, but I decided on the 268XFI before I decided on upgrading to the HSR.

 

I think you will be just fine with the parts you have selected. Well maybe one thing. The 24# injectors "could" turn out to be on the small side. At the least plan on bumping up the fuel pressure.

Also you might want to consider having the Etec 200cc heads worked over with some porting. The couple that I have seen locally were lacking on the advertised figures flow wise.

One person will have his worked on and the other got some pretty good results with his after they were cleaned up.

By the way I'm running a monoblade on my 355TPI with no drivability problems. Will find out the dyno results shortly.

 

wats the flow rate on those etec 200cc heads? maybe not working them over might help u since u dont need 260cfm for a mild 350 with that smaller cam... the HSR is matched for 58mm TB altho a 52mm wouldnt hurt the larger bores or affect the flow. the cam u got is still a good cam it will just create more low end torque and have a lower RPM than the XFI280. and with ur combo i would def be bumpin the fuel pressure to about 50psi.... u need more fuel and i would get it tuned for the correct pressure

1989GTATransAm.... yea i saw ur mono blade haha we will see.... u gona show the diff with the monoblade and a reg 52mm or 58mm? thats what u should do just to see the differences.

 

I will have replaced the Edelbrock TPI manifold with the First TPI manifold along with the change from the Holley 58mm TB to the AS&M monoblade TB. So no apples to apples in that manor. However I can look at the MAP/KPA and see how it compares to my previous dyno runs. That is what I'm trying to accomplish anyways.

Sorry for the hijack of the thread.

 

No worries here... What kind of springs are you running?? I've not seen many people with the 26986 Beehives (they were a fairly new size when I got them originally); Have more people started using these nowadays on aftermarket heads??

 

that cam acts larger than it is. seen a ported heads LT1 car untuned put down 370whp with xfi 268

another guy on here uses that cam in a siamesed TPI setup and put down 350-360whp. revs out to 5800 easily. shift by 6000 or so.

HSR, etec 200's and that cam should easily be 350whp and capable of bottom 12's high 11's in a drag setup

 

yea i read your thread on the progress of the first intake... looks good but thats alotttttt of custom work. u really opened that thing up, it should flow alot.

yea its a good cam, still should give u gobs of power enjoy!

 

"What kind of springs are you running??"

If that question is to me I'm running the 918's. Comp Cams has improved their beehive spring lineup. Peterson Automotive Corp(PAC) makes maybe the best beehive valve springs. They used to make the ones for Comp. Hopefully the ones I have are from that batch.