Have the 350 crate vortec tpi engine now. I am thinking of going to the fast burn heads and am looking for an estimate on the amount of power to be gained to see if it's worth the cost. I plan on installing the HSR and figured it might be a good time to do the heads too.

Thanks for any info you can provide.

 

unless you're upping compression for those aluminum heads I wouldn't bother.

 

Yup, I just got the new Scoggin catalogue. In one of the sections on engine choices they had the same engine and had different packages you buy on that engine. When they switched heads from the moded vortecs to the fast burns they only picked up about 8hp. The did pick up over 30lbs of TQ which I really don't understand but for 8hp it just ain't worth the cost.

I do wonder it the HSR would be a better match for the fastburns but even then how much more could it be?

I did see an article where they picked up 25hp with twisted wedge heads but I keep seeing comments about problems with those heads. Maybe I'll just keep my eyes open for some AFRs since they seem to pick up the most hp on a swap.

Thanks for the advice!!!

 

For the money you would be much better off getting your Vortec heads cleaned up.

 

There is much better than the fastburns now (E-Tec 200's), and more coming out the door (E-Tec 195 CNC Pro-Port, and World 23* 215's). E-mail last week from Pace Performance expects flow numbers on the e-tecs in October, World mentioned something similar.....search and wait... the RHS (Racing Head Service, modified stock iron) Vortecs will beat the fastburns right now I think.

Also think cam, vortec design desires more exhaust duration, but the crate short block should already have taken that in to account. Search TGO (if it works), for recent discussions on vortec cams. Don't overlook www.stealthram.com. On the 355, the E-tec 170 may work fine, but I really want numbers on the Edelbrock 195's.

 

And I didn't check, but if that is a low compression truck engine you got, you won't get much out of it without more compression.

 

Yes but with having the iron Vortech heads worked over he can also get them milled at the same time to bump the compression a few points.

I don't know what head gasket comes with that motor but GM makes a very nice .028" head gasket that would bump the compression.

 

Like my sig says, it's a crate vortec tpi. Was bought from Scoggin and runs well enough to pull several ls1s. I just feel the need, the need for more speed!

OK, thanks for the input. This came up becasue I ran accross a deal on new fastburns for about 825+60 shipping. Figure I could sell my vortecs and make up most of the cost. This would be especially ture since I'll be putting the HSR on and it likes to breath more.

I ran into another article where there uses a zz4 as a foundation. They started with l98 vette heads and got 355hp/405tq.

Next they ran the vortec heads and got 376hp no tq was given.

Then they ran the fastburns with 1.6 rockers and got a little over 400hp not tq numbers given again.

Last they put a hot cam in and got 432hp and 412tq numbers.

This was a carbed engine.

It looks like the fastburns could be good for about 20hp or so. The tq being higher the fastburns baffles me. I thought the smaller runners on the vortecs would make more tq but guess not.

Thoughts????