I'm "building" a brand new 350 TPI setup for my '92 RS. It was TBI, now switching to TPI and I have questions about the cam and TPI:

On my 10:1 "ZZ4/LO5" 350, I have Edelbrock 6085 performer heads with 2.02/1.60 valves and a small Crane Compucam (208/214* 467/482" net lift using LT4 1.6 roller rockers, and 112* LSA. The cam was installed with the intent of using TBI. I know that a good strong TPI cam is around 220/220 490/490+ 112*, but usually with smaller valves. Does the fact that I have larger intake valves help my small cam act like a larger cam? Or am I on Crack?

I would be using a complete Edelbrock TPI (base, runners, 52mm TB). Also the brand new Accel 23# injectors. How is this thing going to run? The rest of my stuff is in my sig. Please HELP!

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'92 RS, ZZ4 10:1 350, Edelbrock 6085 heads, Crane 208/214 467/482 cam, GM/LT4 1.6 true roller rockers, Holley Projection TBI intake, Holley 670 TBI, SLP/Jet-Hot 1-5/8" headers, Catco 3" cat, Flowmaster 3" catback, Hughes 2500 stall converter, stock 700R4, Auburn Pro posi w/3.42, 17x9" SS rims w/BFG tires, Medium Quasar Blue w/white SS stripes, 48,000 miles....soon to be an Accel-DFI Speed Density TPI!!

[This message has been edited by Scott C (edited January 06, 2001).]

 

So far as I know, (and I am NOT an expert) smaller valves will build more power/torque at lower RPM than a comparable motor with larger valves due to higher intake velocity. The larger valves will allow you to make more power at higher RPM, due to increased flow volume. So, by simply going to larger valves, you move your torque/horsepower peaks up further in the RPM range.

 

Can you compare the length and fit of your Accel injectors to stock TPI injectors (if you have any)?

 

You've got to mean 2.02/1.60 valves. I don't believe 2.02/1.94 valves will fit.

Your Edelbrock heads have high velocity ports and they will work very well with your camshaft selection. You should have excellent low and mid-range power.

Even though your camshaft selection is not a lot more aggressive than the stock cam, the better ramps and increased valve lift of the CompuCam, coupled with the heads you have will work fine.

Just don't expect to make big power numbers at high rpm since the cam's duration is so short.

Jake

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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

[This message has been edited by JakeJr (edited January 06, 2001).]

 

You're right, Jake. I meant 1.60 exhaust!

Thanks for the info. I'm looking for strong low end & mid range power, so I guess I'll be ok.

I don't have either the stock injectors or the new Accel's yet. I'll be getting the new Accel ones when they come out in a couple of weeks.