I've been wondering this for awhile it's a 355 flat top pistons comp cams flat tappet thumpr cam advertised lift is 297/279 the heads are just the Tbi swirl port heads but they have been worked a little 2.02 valves stiffer springs for the cam I know the machine shop worked them a little bit not sure exactly what they did has 1.52 roller rockers edelbrock performer air gap intake Holley 600 carb has headers not sure what brand or size they were already on the car if any other info is needed just ask I'll do what I can to answer the questions

 

Those heads aren't doing you ANY favors, they're slug heads. I'd say maybe 225 hp.

If you want to produce hp you need to swap out those heads for some that breath.

 

I have a set of vortecs (got them for $50) in the garage just have to get them to the machine shop and have them checked out and some work done I plan on running the Tbi heads for now get the motor broke in when I switch the heads I also want to switch to a roller cam

 

That sounds like a good plan. The swirl port heads serve a purpose (I have the 5.7 tbi with swirl ports in my 95 K2500) but for hp the vortecs will get you farther.

 

Vortecs will be a huge gain over the TBI heads

 

ya I didn't realize they were such crap heads for performance back when I had them done

 

Take those heads off and throw them into the nearest river,,,that's how good they are..Or sell them to one of "those" guys that believe theyre Vortecs because they use centerbolt valve covers......