I'm debating between the quality of the edelbrock (centerbolt w/ 59cc) and the better flow of the TFS 23* heads (centerbolt w/ 64 cc).

They will be on a 350 w/ 9.6:1 CR (w/ 64 cc, more with the edelbrock **85 59 cc heads), ZZ4 cam, accel base & runners, SLP headers, aftermarket cat and cat-back.

James

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1985 Z-28 305 TPI
221,000+ mi., Original Eng.

 

Get the Trick Flows.

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Mike s

 

I read an article on heads and flow numbers a few years ago. They tested the flow and rated them while running .400 lift. The edlebrock had lower numbers than the tws heads 216 cfm. The TWS G2 heads ran 229 cfm. But the article did state that the Edlebrock heads numbers were much lower but the heads do flow extremely well and although the numbers were not that impressive, the velocities in the chambers were much higher than one would think. I had a set of the tws heads on my corvette and was told they had bronze guides....BS! The guides went south after 6Kmi! However, the tws heads made Huge power! I would go with the Edlebrock, Or get a set of dart heads and have them ported! Dart heads are always overlooked compared to TWS, AFR's etc.

 

I am running the Trick Flow g2 heads on my Trans-Am and they are making great power. With good tires my car runs high 12 second times. Even with the new G2 heads they still do not have bronze guides. Most of the problem with these heads isn't the guides ,it's the use of incorect pushrod lengths. I have about 10,000 hard miles on mine and still no smoke. If you want your car to run get the Trick Flows or AFRs not those week edelbrocks.

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Mike s

 

Whatever you do... don't get the Trick Flows because they don't do ****. They flow as bad or worse than my ported L98s did. I'm sorry I spent almost a grand on them.

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92 Z28 5.7
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Trick Flow 23° heads, Comp Cams XR270HR-10 cam, Accel intake base + ported TPI,
TES headers, Flowmaster catback, MSD ignition, #24 SVO injectors, 1LE aluminum driveshaft.

Click here to see pics of my car.
Check out our car club Truspeed
Check out the Bin Archive for all your .bin needs

 

Synergy, what have you done to your eprom?

It has to match, and that is not a "formula" combo. Time to scope out the DIY PROM board.

 

If you had the G1 twisted wedge heads then they would flow about like a stock head. If you have the new G2 twisted wedge heads and cant suck some air your problem is not the heads.

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Mike s

 

We're talking about the 23 degrees heads here NOT twisted wedge. Might want to read the title and other posts first.

 

Synergy,

was your old username Blade?


James

 

which would be better for the ZZ4 cam with
free flow exhaust and accel base/runners?

Edelbrock 6085 w/ ~10:1 CR
TFS 23* (w/CNC comb. cham.) w/9.6:1 CR


James

 

I just ordered the 23* heads per a lot of advice from guys running them. I think synergy's problem is his Compression Ratio. Did you do anything to bring up your compression?? Remember that an Aluminum head will dissipate heat much faster than an Iron one will and that results in a slower burn rate with identical CR's. An Aluminum head will require a boost in CR to make the cumbustion temperatures get hot enough to get a full and efficient burn of the intake/fuel charge.

Laterzzzzzzzzzzzzzzzzzzzzzzzzzz

 

All I know are that I have seen tests where trick flows heads barely beat vortecs. Also, GM high techs car "Magnum" has them and doesn't run well. They are cheap and it shows.

 

I run the Edelbrock 6085 heads and love them. There is a lot to say for the velocity of the ports on these......

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Hank
87'IROC Z28
Hanks 87 IROC

 

Gotta agree with Hank. Flow is only one aspect for a set of heads. Velocity is quite important, and considering the TPI setup is a mid range torque design, the higher velocity, lower CFM edelbrocks will probably be a better choice. If you are going to change your intake and go for some higher RPM, then the TF heads might be a better choice.

I am running #6089's with a ZZ3/4 cam and a stock intake setup (ported here there and everywhere.) I am really impressed with how it turned out. Plenty of power where I drive most. Mileage is stellar too.

I have never used the trick flow heads, but I would say I have heard more bad things about those heads than I have heard about the edelbrocks. Not sure why, just an observation.

Mark.

 

I run the Edelbrock performer RPM heads on my 383 TPI. I was very imporessed with the quality and workmanship on the heads. bronze guides, stainless swirl polished valves, nice seals, good quality springs. The casting quality looked very good and the bowls were blended very nicely. They are produced in a very high volume foundry and the quality control is very good. Performance wise I am very happy.

 

GMHTP's car was an abortion from the start. They threw that thing together in a hurry and it hasn't had all of it's bugs worked out. Can't blame the heads, in that case anyway............

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Matt

1987 GTA L98 MD8 GW6

"Stop Lights timed for 35Mph are also timed for 70Mph"

 

matt87gta have you ran the 23* heads yet? How do they perform?

James