TW170 vs. AFR 205 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 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 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.
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post #2 of 8 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 8 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 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.
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post #4 of 8 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 8 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 8 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 8 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 8 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 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.
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