For the 355 I am building I was thinking of getting Vortec heads but then I have to get different rockers, valve covers, intake, etc... How do the SR Torquers with 2.02 valves and 67 cc chambers compare to the Vortec heads with all other internal internal engine parameters being the same. Here are the basics: Comp XE268 cam, approx. 8.75:1 - 9.0:1 compression, Performer intake (I don't think the RPM Qjet will fit, or will it?), Edelbrock TES cat forward, higher flowing Cat, Flowmaster Force2 catback, 700R4 Tranny, 3.42 rearend gears, CC Qjet, and what ever ignition system to go with the CC distributer. What would you go with, the Vortecs or the SR Torquers? All opinions are definately appreciated. Thanks for your time.

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1986 IROC LG4 "Bone Stock" (for now)

 

I am currently having a 358 built for my '86 Z28 and have the exact S/R Torquer heads you are describing, milled to 64cc. In fact everything is pretty much the same-cam specs, comp ratio, 700R4, rear gearing-with the exception of TPI on my engine. The engine is nearing completion and will be dynoed. For cost sakes, I would go with the S/R's over the vortec heads. The S/R's are an excellent street head with good runner velocity, they "breathe" well and should be very reliable!

Good luck and enjoy!!

[This message has been edited by BlackZee (edited May 04, 2001).]

 

I was never impressed by the S/R Torquers, personally. My old 882 heads ran within a tenth and 1 MPH versus a set of equivalent S/R Torquers. I have not used Vortecs but I suspect they will give a lot more performance than S/Rs.

One set of heads I CAN give the thumbs-up to is the Dart Iron Eagles. Only about $150 more than a set of S/Rs, they perform FANTASTIC right out of the box. I picked up 3 tenths and 4 full MPH versus the S/Rs with NO other changes. All your stuff will bolt right onto them, too.

 

S/Rs come in around $700+ don't they? You're still looking at spending more with them, and they don't flow as well as Vortecs, although they're not too bad...

Here is a chart that flows the S/Rs and the Vortecs, along w/ several other heads: <a href="http://www.inter-scape.com/ray/headstest/headstest_4.jpg">Here</a>

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray


[This message has been edited by Ray87Z (edited May 07, 2001).]

 

That is the chart I have been going thru my mags to find but haven't had any luck. I see that the flow chart shows that nothing beats the Vortec on the intake side, and the SR's are second on the exhaust side only to the Performer's between .400 and .600 lift. It looks like the Vortec exhaust falls short along with the Exhaust to Intake ratio at only 66%. What is the optimum ratio?

Thanks a bunch!
Mark

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1986 IROC LG4 "Bone Stock" (for now)

[This message has been edited by wiggy'sIROC (edited May 07, 2001).]

[This message has been edited by wiggy'sIROC (edited May 07, 2001).]

 

I guess the exhaust side could be opened up like Edelbrock did to their E-Tec Vortec style heads. Is this feesable?

Mark

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1986 IROC LG4 "Bone Stock" (for now)

 

Most of the stuff I've seen advises staying away from messing w/ the ports yourself on Vortecs, because if you don't do it correctly you'll lose velocity which is their advantage in the first place.

Just be sure to run a nice dual pattern cam to make up for the weaker exhaust a little. They perform excellently without any port work in most of the magazine tests (350+ish hp) w/ the CompCams 268 cam...

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

[This message has been edited by Ray87Z (edited May 08, 2001).]