I've been researching doing a 3.4L swap in my Fiero. I'd been using Desktop Dyno to compare modifications and camshaft specs. I was under the assumption I'd be using a 3.4L engine with a hydraulic flat tappet cam.

What I would up finding (unexpectedly) and buying today was a 3.4L pushrod longblock with factory hydraulic roller cam and roller lifters for my rebuild!! Now what do I do??

If I stay with a roller lifter cam (I'd like to) - I'm stuck with the factory cam, as there are no aftermarket performance roller cams for this application. Otherwise, I have to change over to a standard hydraulic cam setup and lifters.

I haven't found any specs for the factory roller cam, so I can't even test it out in Desktop Dyno to make comparisions.

At this point, if I want to keep the roller cam, is my best bet is to use 1.6 rockers with it, and "hope" for more performance? Or - get the stock roller cam reground to a better profile? But the, who would be capable to of doing a proper regrind??

Any suggestions??

Thanks in advance...

Is this a "new" block assembly? If so, is it a GM performance parts engine? The reason that I ask is that the only roller cam that I have found is the GM performance parts cam. The GM dealers will have the cam spec's in their catalogs. It is a very nice performing cam with better bottom and top end than the CompuCams have- the ramp profile for the rollers is an amazing thing!

I thought the 2.8/3.1/3.4 cams were interchangable? If this is true there are plenty of aftermarket roller cams availible for it.

[This message has been edited by Oreif (edited 06-17-2000).]

Hey Fierosound good find.

Hey Fierosound.. I am thinking of doing the same thing. What did you find your block in? Camaros and Firebirds or are thoes the push rod one?? What's the diffrence? Is this the Over Head cam one? I am confused. Anyone wanna explain the diffrence to me?

[This message has been edited by Formula 18 (edited 06-17-2000).]

i'm assuming Fierosound means a 3.4 pushrod engine that has a hydraulic roller cam and roller lifters. If you can find a replacement roller cam, that's the way to go. Formula 18, the possible reason for your confusion is that there is another 3.4 engine that has special heads and uses 4 overhead cams, two per head. These are called TDC 3.4 which means Twin Dual Cam 3.4, which are not the same as the Camaro 3.4 pushrod engine.

I don't know what this engine came out of, but it must have been an APV or Transport - the starter bolts are where I need them...(woohoo!!)

OREIF... would you please post some links to any cam manufacturer's online catalog page swith V6 roller cams listings for the 2.8/3.1/3.4 that you have found?? I couldn't find any when I searched, you may have a better search engine... The speeed shop guys here didn't even know V6s had performance cams of any kind!! Thanks...

Thanks to all...

BB-
I got the difrence between the Twin Dual OHC engine and the push rod one, but what the diffrance between the roller cam and the other one? is it just the lifters, and cam or what? What are the advantages to these roller cams? Sharper angles, more lift?

Fierosound-
I looked up the engines (on Carpoint) in thoese van and this is the only one I could find. Is it the one and if not will it work ??

3.3L 180 hp V6 SEFI
Horsepower 180 @ 5200 RPM
Torque (lb-ft) 205 @ 4000 RPM

It is out of a 96 or newer Trans Sport

Thanks for all the help?