Looked and looked but still would appreciate some input. Here's the deal...

I have scoggin crate vortec tpi in my car now with about 40,000. Of course the heads were modified to take the lt4 hot cam with the 1.6 rocker arms. I managed to spin a bearing so the engine is coming out to fix the problem. With the engine out I was thinking about just having the bowls etc. cleaned on the vortecs before putting them back in but started thinking about maybe some Fast Burns or AFR210s. There is also a HSR that will be going on instead of the TPI. I am concerned the AFR 210 might be a little much for the street but again am looking for opinions. I am concerned that the cleaned up vortecs will likely flow within about 10hp of the Fast Burns so that didn't seem cost effective.

Input will be appreciated. I intend to do some '07 Vette (no not the z06)hunting with the new package.

Thanks!

 

The switch to aluminum drops a fair bit of weight (about 50 lbs.) off the nose of the car, so consider that when you make your decision.

If you want to go with AFRs I'd definitely recommend something smaller than the 210 for your combo. The new Eliminator 195s are plenty big and flow like Niagara Falls. I'd even consider their little brother, the 180s, which are still bigger than the Vortecs you currently have and flow better. HOWEVER, they are not Vortec-style heads, which means your current Vortec intake won't bolt up.

I have no experience with the Fast Burns, but I haven't heard of many people gushing over them about their spectacular performance.

Another alternative is the GMPP Vortec Bowtie heads. They're still cast iron, but have some significant performance-oriented improvements over the production line pieces and are available in both small (175cc) and large (206cc) intake ports. Here's a link to the fully assembled large port version on Scoggon Dickey's website:

http://www.sdparts.com/product/25534...inderHead.aspx

I recall a year or so ago one of the magazines did a back-to-back test with the Bowtie Vortecs and knocked almost half a second off the ET of the car they tested them on. The car originally ran low 12s with pocket-ported production line Vortecs and ran high 11s with out-of-the-box Bowtie Vortecs (the larger intake version, if memory serves) with no other changes.

 

other than the money factor, i dont even think there is a question.

i would go AFR, i would probably go for the 195cc though.

 

I think I'll just have the heads massaged at this point. While the 50lbs sounds good that is about 5hp if memory serves me. The AFRs came up because I had a chance at a set for $800 but again they were 210s and at 1500+ for the 195s it doesn't seem cost effective. From what I can gather the massaged vortecs will flow within maybe 10 hp of the fastburns so $800 for 10 to 15hp looks like a poor investment as well.

Mabye I'll just get a vigilante since it will help the car as much or more than the heads at this point and for less money!!

Anyway, thanks for the help.

 

Well, it's good news and good news. Found out it WAS NOT a bearing but a a piece had come loose so no engine pull for now. Good news.

Next, just found a set of 195cc AFR heads on ebay with 'only 7,000 miles', and they do look quite good, for....are you ready for this?.......$775 shipped. Yes, I'm still in shock. Good news again.

Now I have to dump the stealth ram vortec I have for a regular stealth ram and get them on.

I was wondering if anyone would be willing to venture a guess as to how much more hp the AFRs and Stealth Ram will make over my TPI which is gasket matched and the plenum is well proted. I am guessing that the heads are good for about 40 and the HSR is good for about 30 which could mean 70ish? Thoughts?

Thanks!

 

I was going to estimate 50, assuming no cam or compression ratio change. But I don't like to give overly-optimistic HP guesses- too easy to be disappointed.

That thing is going to need a chip tune to get it, though. It's going to be a very different animal than the current heads/intake combo, even with no cam change.

 

"Over optomistic"...I understand.

The car already has the lt4 hot cam and 1.6 rockers along with custom chip which no doubt can be improved with the new set up.

I was basing my number on several dyno test for the HSR which showed at least 30hp at around 4500 rpm, if memory serves, and over 90hp at 6000 vs a modifed TPI set up with large tube runners. Right now I have stock runners with a 52mm Holley up front.

As for the heads, well I hope 195s aren't to large but they seem to be a good set for the HSR. The tests I have seen show between 45 to 50hp gain over the bowtie heads which already out flow my modded vortecs.

So with that said I figure 35 for the intake and 35 for the heads may give 70 but you don't know until you hit the dyno or strip.

As she sits right now she's pulled a new 350z, 2004 audi s4 twin turbo, SS camaros, WS6 TAs, numerous old and new mustangs including one '04 Cobra (was pulling him slightly until he missed second and he wouldn't run me again for some reason), and one LS1 vette who thought I had nitrous. They were stop light runs up to from anywhere 50 to 100 mph with a modded TA being the last run up to 100 and that was pretty close. Ran a new vette about 3 months ago to about 50. At 50 he had 1/2 a car but I had traction problems while he stuck.

Next only the list is to get rid of these 2.73s!! After the heads and intake of course.

Thanks again for the input.