TW170 vs. AFR 205 - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 16 Old 03-18-2017, 10:39 PM Thread Starter
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TW170 vs. AFR 205

All things being equal in setup what power gains would be expected by switching from TW170 heads to AFR 205's ? The TW170's are 1262 gasket matched and tapered upwards while the AFR's are the #1450 CNC ported from manufaturer. Current setup is in sig.


'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #2 of 16 Old 03-18-2017, 10:52 PM
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What would this swap do to your compression ratio?

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post #3 of 16 Old 03-18-2017, 11:10 PM Thread Starter
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Same CR. Both are 58cc chambers and 10.5:1 CR

'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #4 of 16 Old 03-19-2017, 12:19 AM
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I'd think it would depend on your intake. If intake is the bottle neck then you won't see much gain.
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post #5 of 16 Old 03-19-2017, 02:17 AM
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Are you sure you didn't quote the gasket part numbers backwards? I'm pretty sure the 205's take a 1262.
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post #6 of 16 Old 03-19-2017, 07:55 AM
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I am a fan of the Stealth intakes, but I think you would be faster with a Victor Jr. with either head.
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post #7 of 16 Old 03-19-2017, 12:04 PM
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You would see some gains, but not sure how much. Changing your current intake and cam would be more worth it over getting a new set of heads. You may make the same amount if power switching to the AFR 205'sx and keeping the rest the same. Personally I'd get the AFR Renegade series heads, a new cam, and a Super Vic.

89 LX: 308, AFR 165 Ren., FTI cam W/LSX style springs, TFS Box-R w/Accufab 75mm, TKO 600/Spec Stge 3, Quicktime bell, 31 spl. Moser 5 lug 8.8 w/9" ends, AFM PP, Team Z Sus., Fluidyne rad, 2.5" Harwood , etc..
86 GT Hatch: CHP- 408w, AFR 205's, TKO 600, FAST XFI, sold 8/2013
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post #8 of 16 Old 03-19-2017, 08:19 PM Thread Starter
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I will be changing intake to a Victor Jr. that should make power from 3500-7500 rpm's

Current Cam:
Advertised Duration (Int/Exh): 276/282
Duration @ .050 (Int/Exh): 241/249
Gross Valve Lift (Int/Exh): .554/.576
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016/.016
RPM Range: 2600-6800

New Cam:
Advertised Duration (Int/Exh): 290/298
Duration @ .050 (Int/Exh): 257/265
Gross Valve Lift (Int/Exh): .600/.624
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016/.016
RPM Range: 3000-7200

'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #9 of 16 Old 03-25-2017, 11:05 PM Thread Starter
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Was hoping for more input before I get the 205's

'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #10 of 16 Old 03-26-2017, 12:47 PM
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I know a couple guys making right at 400 to the tire with a custom cam, AFR 205's, 347, naturally aspirated. I've never heard of anyone making 400 rwhp NA with 170's. I have 11r 190's on a 363 I'm putting together. I wish I would've bought the 11r 205's or maybe even high ports.

I can't see your sig on my phone to know the rest of the combo. Hopefully I provided something that can help you out.

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post #11 of 16 Old 03-26-2017, 01:01 PM Thread Starter
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Current setup:

91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 800DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 28/10.5/15W slicks. 7.12@95.5mph 1.58 60' so far.

'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #12 of 16 Old 03-26-2017, 01:26 PM
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I think it's hard to guess when your 170's are not stock. Do you know how many cc's they are now?

1982 Ford Fairmont Futura H/C/I, fuel injected and turbocharged 10.67@128
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post #13 of 16 Old 03-26-2017, 07:57 PM Thread Starter
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The Tw170's are 56cc after surfacing. The new AFR 205's will be 54cc.

'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #14 of 16 Old 03-27-2017, 01:01 AM
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Sorry, meant the intake port.

1982 Ford Fairmont Futura H/C/I, fuel injected and turbocharged 10.67@128
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post #15 of 16 Old 03-27-2017, 08:01 AM Thread Starter
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Ports are basically stock, I only opened them up slightly at the 1250 gasket surface tapering back up the runner and no bowl work.
Looking at manufacturer head flow specs the AFR's outflow the 170's by 50cfm intake and 40cfm exhaust- wondering what real world experience is.

'91 Hatch - 358W 10.5:1 -TW170's - Lunati Solid Flat cam (61041) 241/249@.050 .554/.576- Weiand Stealth intake- Holley 750DP- C4 w/4000 stall -8.8 rear with 4.30 full spool w/31spline eliminators - M/T 275/60/15 Drag Radials. 7.07@95.5mph 1.58 60' so far.
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post #16 of 16 Old 03-29-2017, 02:04 PM
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that engine combo only needs around 280cfm at 7k rpm. so i doubt there would be much of a gain even with an intake swap. itll likely pick it up a bit, but i doubt it will be night and day. we had a big cleveland head that flowed 340 cfm on a 358 and pump gas. it went 6.80s at 98mph on motor. put the same head on an 11.5:1 408 and it went 6.30s@111 on motor. the smaller engine just doesnt have the cylinder demand.
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