southerniroc

I have been thinking of going with the Trick Flow G2 heads and was wanting to know something. They told me that I could use any pistons as long as my cam stayed at a .50 lift or less. If I went with a bigger lift that I would have to use their pistons which are $500 . Is a cam with a .50 or less lift going to be enough or is it going to be a miss match. Is it worth it to go ahead and spend the extra money for the pistons, so I can have a cam with a higher lift. I am pretty green when it comes to cam talk , so bare with me please. This is my first motor rebuild so I am learning as I go.

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87'IROC-Z 350 TPI
Ported Plenum,Hypertech Air Foil,Ram Air kit,SLP headers,AFPR,80series flowmaster and MAF screens removed.
14.61@94mph(90+ degree weather)

Guido

Why did they tell you that? Did they state a reason?

Do you have the flow numbers on those heads? Its a possibility that they may stop flowing more air around .500 so a larger cam isnt really neccesary.

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-86 IROC
Vortech stuffed EFI 406 in progress
-=ICON Motorsports=-

Matt98SS

I would personally take a pass on those heads. Go with there 23 degree heads if you are set on Trick Flow brand

Superman

The reason they say that is bcause of the angle and position of the valves in the heads.The heads flow good all the way up to .600 on paper.I have Trick Flow Twist Wedge heads and I run a .525 lift cam with 1.6 rockers and JE ultra lite pistons and have not had a problem with them.If you do go over the .500 lift be sure to take extra time to check piston to valve clearance.I'm not telling you it will work,just that I have done it and had no problems.$500.00 aint bad for a set of good pistons,so if your not set on another type I would check them out.

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Superman
Rev'n to Seven

southerniroc

I didn't ask why the cam had to be a .50 lift or smaller, I assumed that any lift bigger than that would hit the piston. Like I said before I am new at this, so what ever they told me was new information to me and I am trying to learn everything I can . I'm not stuck on Trick Flow heads I have heard good things about them, so they were at the top of my list right now. I still have a month or so before I make my final decision. Is there any other brand that you might recommend, I should check into? I was stuck on AFR for awhile, but they are just a little high for me. I have also considered the Edelbrock 6085's too, but I haven't heard to much about them yet. thanks for your help so far.

Matt98SS

the 6085 Edelbrocks are a great street head! awesome out of the box, great components, etc.

I ran them on one motor I built...then they went on a 383 that a guy I know built.

they are really 100% bolt on down to all the accessories and valve covers...no trickery here

[This message has been edited by Matt98SS (edited September 12, 2000).]

southerniroc

The Edelbrock heads aren't limited to what size rr or cam lift are they. I really don't want the hassel I am having with the G2 heads. I really don't know enough to step into what I am steping into with the G2 heads. I guess I want something thats not going to give me the trouble the TFS heads are giving me. Do the Edelbrock heads perform as good as the Trick Flow heads?

Daz

iTrader: (1)

You dont need special pistons for it..If you want a higher lift cam all you need is a meatier piston then flycut(cheap).Comparing the Edelbrock 6085 heads and TFS G2 heads are like comparing apples to oranges if you dont have the combo with it..The Edelbrock flows less on paper which is good for stock to wild on a 350.The TFS G2 heads flow more which is good for a 350 or bigger with .So it all depends on the rest.I have the TFS G1 heads and heres a pic of what was done to the pistons
http://www.freeyellow.com/members8/d...istonclose.jpg

Ive heard a lot of good things about Edelbrocks.Theyre probably the most user friendly head around TFS G2 on the other hand is the best bang for the buck IMO

To quote my engine builder
"All of those heads can make power as long as you do it right"

[This message has been edited by Daz (edited September 12, 2000).]

Ski89Z28

I have the Edelbrock 6085's on my 89 350 TPI engine and have not had any problems do far. The thing about them is a note comes in the box saying you can't use 1.6 roller rockers. However there are people here who do have 1.6 RR on them and everything seems fine.
I talked to a Edelbrock tech guy and he said that the springs will bind with a .560 lift cam. I run 1.5 RR and the ZZ9 cam and have had no problems. You need harden pushrods and depending on the manufacture of the RR you may need either standard length (7.2") or +0.100 over. They give you a list.
Other than that they are like everyone says straight bolt ons.
Good Luck!

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89 IROC 350 Auto
TRUE DUAL Exhaust
Edelbrock Performer Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
14.01 @ 97.0mph with 2.77's gears

Matt98SS

how long have you had the Edelbrocks for? I know that 2-3 years ago I had gotten them and they were good to .600" lift. They have 1.46 springs on them. I used 1.6s on them with no problems

Kevin G

Does anyone know the flow of the G2 heads??

I know thw TFS twisted wedge heads flowed almost identical numbers as the Edelbrocks.. Both maxed around 230 cfm on the intake side@28 inches.

Are the G2 heads that much better???

Mark 89Formula

Kevin, get a hold of the Sept 00 GMHTP mag. They tested 12 cylinder heads including the Edelbrocks and G2s.

Peak values for these two measured at 28 in-H20 were:

Edelbrock
in - 226 CFM @ .500"
exh - 172 CFM @ .550"

TFS Twisted Wedge G2
in - 249 CFM @ .600" (238 CFM @ .500")
exh - 190 CFM @ .600" (175 CFM @ .500")

So the G2s outflow the Edelbrocks but the intake runner volume of the G2s is 21 cc larger (190 vs 169).