Trying to pick a head for my combo but can't decide between TFS 23 degree heads or Edelbrock performer 6085's. I know that everyone basically aqree's that AFR makes the best heads but they dont fit in to my bugit. Also wondering which RR to go with 1.5's or 1.6's and what pushrod length would I need.

Mods:
-bored .030 over
-fully balanced
-KB Hypereutectic pistons
-all ARP bolts
-Gm ZZ3 cam 208/221 .474"/.501"
-fully ported stock upper,lower and runners
-airfoil
-Holly AFPR
-MSD 6A, 8.5 wires and coil
-3inch Flowmaster catback minus the cat
-180 stat
-all free mods

 

i would also like to know what time slips I can expect. My car ran a 14.35@96.2 with a 2.053 60 foot time with only a fresh set of plugs and wires.

[This message has been edited by TA88GTA (edited September 20, 2001).]

 

I think everyone would say go with the TFS 23 cause 1) they flow better 2) cost less or the same and 3)if you stroke the motor in the future will support the bigger cubes.

However, the Edelbrock's would be a better match for your engine now because 1) smaller port=faster velocity 2)Comes with the correct Combustion size so you don't lose compression as opposed to the TFS 23* 3)Heads were designed with TPI in mind. 4)Proven Results. Someone on this board ran 13.00 with these heads box stock on a 350 TPI with a Superam and 219 Cam and stock shortblock . The small port, high velocity heads are proven to make power with your ported stock TPI and a mild cam like the ZZ4 engine. You should probably be in the 13.3-13.5 area depening how your tuning skills.

My take is that Edelbrocks are just as good or better box stock than a set of fully ported L-98 aluminum heads.

The TFS 23 heads are better matched to a 383 or bigger engine or a Supercharged engine that's looking to lower Compression Ratio in order to run more boost.

I'm sure I started an argument and others will agree with most of what I said but there's more detail to get into.

 

I would agree. If you plan on keeping the long tube style intake (incl. SR) I would say go with the Edelbrocks. The smaller port was designed for a TPI in order to keep the velocity high. That is the reason I chose them for my car, and have been pleased.

If you ever plan on stepping up to a MR though, I would say get something else. AFR's would work exceptionally nice with a MR.

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Black 88 GTA L98
261 RWHP, 345 RWTQ
13.406 @ 103.72 MPH
ZZ4 bottom end, Edelbrock 6085 heads, LT4 HOT cam, GMPP 1.6 RR's, ported stock TPI, SLP 1 3/4" headers, no cat, Dynomax cat-back, Stock PROM
E.T.F.A Member #11

 

Thanks for the info guys will probably be going with the 6085's. Do either of you have the flow #'s for the edelbrock's

 

I've got the 6085's and I'm VERY pleased with them. I use the AS&M runners and the ZZ-9 cam. I run consistent 12.90's but I managed to pull a 12.84 and a 12.80 out of it 2 weeks ago. That's N/A with a little bitty 3.27 rear

The only complaint I have pertains to any aluminum head:

This past summer I pulled the threads out of 2 spark plug holes in my 6085 heads...had to pull the heads and get them "Heli-coiled"...and yes, I did use "anti-seize" on the plugs...ALWAYS.

If you ask me, I don't know why Edelbrock doesn't put Heli-coils in their heads at the factory...they should. In fact, all aluminum head manufacturers should.


Torq

 

On the topic of pulling threads from al heads, why does trickflow specifically mention NEVER to use antiseize on the plugs or header bolts, but only use motor oil on the threads.

Why?

 

I don't know either but I'd sure like to hear it. I just used it anyway.



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_ ___ _
SMasterson

 

The 6085's are helicoiled, at least for the past 2 years they have been.

 

Uuuuhhh....wrong.

Weren't any in my heads.

but then again, I got my heads from PAW...they may have sat on the shelf for awhile prior to me getting them. Who knows.

 

The 6085 heads work very well and produce some pretty good results. I have run them with a long runner / small cam and run mid 13's... With a SuperRam and 219* cam they get the car to 12.8's with no problem. The quality of the head is great and I have not ported them.... right out of the box

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Hank
87'IROC Z28
Hanks 87 IROC