I love the trick flow 23*
am i crazy?

Someone mind telling me the performance difference between the AFR heads and the trickflows? are AFRs supposed to be better?

Im running a tpi engine so to maintain streetability and torque i can't get to large intake/exhaust ports. Thanks guys!

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

I think the trick flow heads will do you a lot of good. The afr heads may be be better, but they also carry a hefty price tag, and seeing as you want to not go overboard in a head, the trick flows would probably be the best choice for you.

 

Aight thanks alot, I appreciate it

I was thinking that

I know AFR has a heavy tag, but not sure why

it better all be CNC'd

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

Since your running a 305, you might want to check for valve-deck clearance. The 23* heads have 2.02 1.60 valves, those would be tight on a 305. i think you can get afrs with smaller valves. Even if the valves clear the deck, they will be pretty shrouded.
If you want to keep good low end torque, look into a set of aluminum L98 heads, got mine used for $400. They are better than the 23* for low end and are a great head for a tpi 305. Just a thought.
good luck

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'88 RS (originally 2.8)
-350, .040 over, vette alum. L98s, stock tpi.
-305 injectors & chip
-TES headers & edelbrock cat back
-3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
on a 2.050 60 ft.
(Damn the 2.8!)

 

The old G2 TFS heads would work on the 305 with their twisted combustion chamber/valve setup. I don't think the 23 degree heads will, don't know. That is assuming you're buying these heads for your 305, you didn't really state...

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

[This message has been edited by Ray87Z (edited July 23, 2001).]

 

these heads are for the budget 383 by the way

not my worthless 305



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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

Which ones are better, the CNC ported Trick Flow 23* heads, or the Trick Flow G2 heads? There is only a $25 difference.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, LPE High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

The G2's have a larger combustion chamber, which means less compression ratio, but their valve angles/spark plug positioning is supposed to be an improvement fromt he 23* if i understand right

someone care to correct me?

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

The trick flows 23* aren't CNC ported. The combustion chambers are CNC cut. But the cutting from regular stock heads increases the combustion chamber size to around 66 cc.

The 23* heads are OK but the port angles and geometry around the ports doesn't look right for TPI. At least not when I put them on. The larger intake port size quickly gets smaller and that transition area is like a wall when bolted to our TPI intakes. Of coarse this is just my keyboard engine designer thinkin'

James

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1985 Z-28, 350 TPI, T-Tops, edelbrock 6085 heads, ZZ4 cam, accel base/runners & 24 lb/hr inj., ported plenum, everything gasket matched, crane AFPR, SLP 1 5/8 headers, single 3" flowmaster catback, 3" Catco cat, modified tranny, 165 ECM & ARAP code, MSD 6AL/wires, edelbrock STB, Spohn SFC, GW "wonderbar"

 

I asked a rep at trickflow about the 23*-vs-g2. He said the g2 will make slightly more power but the pistons have to be fly cut when used with stock flat top pistons.
He leaned me towards the 23*. You have to way the power advantage agianst the simplicity factor. He also made it clear that the hp increase on the g2 wasn't that much over the 23*.

 

Thanks alot, thats some really usefull info

you kick @$$

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

I got the 23 degrees and yes, the opening is huge in comaprison to the intake port outlet on the TPI, but... Thats what they invented aluminum cutting bits for

 

Preston Smith
used to be vortech t-trimed 305
TPI intake
ported 23*

9.90s

nuff said

they work well

 

Yep, my dad just ran into that problem installing a set of twisted wedge heads on a 350 L98. The valves dont clear the pistons, and the pistons for those heads cost $500. The guy is sending them back and getting the 23 degree heads instead.


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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Look at Canfield heads, port the exhaust and the'll flow GREAT! cheaper than AFR too.

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTR, !plenum, 52 TB, MSD 6AL, TPIS level V prom, Superior shift-kit and all the minor mods, a Canfield headed 383 in the works!! ready May 2001...ok..june...july..and with Accel DFI....looking for SR or miniram....
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)

 

Canfield?

Give me a link

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

http://www.canfieldheads.com/

www.jegs.com had them "on sale" for 499.95 each not long ago. IMO they're the best street aluminum head for the money right now.