105 Headers Comparison/shootout! - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 126 (permalink) Old 02-18-2019, 11:37 AM
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Originally Posted by PocketAce View Post
Will do, was ready to get that done regardless! I can't figure out how the headers hook up to the collector for certain. It looks like the primaries are only secured to the collector by a single bolt on a bracket, which is welded on the lowest primary. Maybe that's another reason why they crack, all that leverage on a single point, etc...

Anyone ever fit a set of Sperry headers with a GTAM side pipe on a S3 Spider? Because that's 100% happening rather soon, unless you tell me it's a terrible idea
sounds like you are building a race spec motor if you are dumping out of the sides with gtam shorty resonator... :-)

sperry's are more race spec due to there 4-1 optimized for higher revs rather than the more street oriented 4-2-1. you pay to play if you plan on your motor living from 5-7.5k

https://www.alfabb.com/bb/forums/alf...05-series.html

https://www.alfabb.com/bb/forums/alf...ks-header.html
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post #17 of 126 (permalink) Old 02-18-2019, 11:46 AM
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sounds like you are building a race spec motor if you are dumping out of the sides with gtam shorty resonator... :-)

sperry's are more race spec due to there 4-1 optimized for higher revs rather than the more street oriented 4-2-1. you pay to play if you plan on your motor living from 5-7.5k

https://www.alfabb.com/bb/forums/alf...05-series.html

https://www.alfabb.com/bb/forums/alf...ks-header.html
Not a race motor right off the bat, but there are only certain things that can be done with a rusty junkyard Spider.

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post #18 of 126 (permalink) Old 02-18-2019, 12:55 PM
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I have the Spruell's. I do not know if they are better than the others. I got them because, I think, they are the only ones that have each tube equal length. Also - they look cool. (but not as cool looking as the Shankle ones.)

My engine is very strong and has a lot of mods that all finally came together well for an incredible street set up- not sure how much power to attribute to the headers but at least they look badass...
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post #19 of 126 (permalink) Old 02-18-2019, 01:24 PM
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I have the Spruell's. I do not know if they are better than the others. I got them because, I think, they are the only ones that have each tube equal length. Also - they look cool. (but not as cool looking as the Shankle ones.)

My engine is very strong and has a lot of mods that all finally came together well for an incredible street set up- not sure how much power to attribute to the headers but at least they look badass...
Care to share a quick list of mods, sir?

~*~*~1986 Alfa Spider Graduate~*~*~
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post #20 of 126 (permalink) Old 02-18-2019, 02:05 PM
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Care to share a quick list of mods, sir?
Spreull 2mm overbore apple bite pistons with the associated liners, spreull aluminum flywheel, 12mm alfaholics cams, ported head, 40 DCOE's, velocity stacks with ITG filter (don't know about performance gains over stock intake but looks and sounds really good...)
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post #21 of 126 (permalink) Old 02-18-2019, 03:09 PM
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How does the heat shield work? Headers look great!

Cars ruined my life! 😱
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post #22 of 126 (permalink) Old 02-18-2019, 03:50 PM
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How does the heat shield work? Headers look great!
the heat shield seems to work well. It is a '69- i run it hard without both of the dual boosters and it brakes well so i guess it is fine. I have the fancy, centerline, wilwood front brake set-up (6/lb per wheel less unsprung weight!) which offers excellent stopping power. If you want to have the boosters (a must for the originality police) then it may be a tough fit. I have had a '69 with the 2 boosters and the current one without any. I notice no difference between pedal feel and stopping power from either set up. With brakes, it seems to me, it is best to have fewer points of failure...

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post #23 of 126 (permalink) Old 02-18-2019, 08:15 PM
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There's a set of Shankle headers for 105 cars on ebay now.

https://www.ebay.com/itm/Alfa-Romeo-...IMy:rk:32:pf:0

'67 Duetto, '74 GTV
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post #24 of 126 (permalink) Old 02-19-2019, 03:46 AM
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for TS: if you only want to do it for sound: don`t.... There are more easy ways to get a nice sound, and headers do not contribute that much in total.
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post #25 of 126 (permalink) Old 02-19-2019, 07:30 AM
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Originally Posted by Dave Garfinkel View Post
Spreull 2mm overbore apple bite pistons with the associated liners, spreull aluminum flywheel, 12mm alfaholics cams, ported head, 40 DCOE's, velocity stacks with ITG filter (don't know about performance gains over stock intake but looks and sounds really good...)
Woosh! VERY NICE!

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for TS: if you only want to do it for sound: don`t.... There are more easy ways to get a nice sound, and headers do not contribute that much in total.
*Partially* disagree on that blanket statement, kind sir. Primary lengths do alter the sound significantly, and so does overall header configuration (4 to 1, 4-2-1, etc...)

I bet a Spruell header (equal length 4-2-1) sounds different from a Sperry (equal length 4 to 1), which sounds different from a Shankle/Centerline/Vick's/Alfaholics (slightly unequal length 4 to 1.)

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post #26 of 126 (permalink) Old 02-19-2019, 08:03 AM
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Agree on the "sound" portion in regards to headers.
Alfa's original cast iron headers are sequenced with the firing order so that alternate pulses come out of the two branches and it generates that unique Alfa pulsating sound when an exhaust system is set up right.
My GTV has the cast iron headers, an Abarth front resonator, a Centerline Magnaflow center muffler and Centerline's stinger. Sounds fantastic and it isn't too loud. My duetto is about to get an identical set up.

'67 Duetto, '74 GTV
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post #27 of 126 (permalink) Old 02-19-2019, 09:21 AM
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Ports 1&4 and 2&3 are always paired in 4-2-1 headers so that the pressure pulses in them are evenly spaced. That is for performance. Sound is a byproduct.
One of the top Alfa engine builders in the US has a set of modified IAP headers that he uses on motors on his engine dyno. He has shared data that shows how the HP peak varies with the length of tube from the collector to the open tail pipe. An engine can make upwards of 5 HP more tuning that length.
One of his customers paid Burns big bucks for a custom 4-1 system with an engineered collector and it made less power than his modified IAP headers. He was able to adjust some pipe lengths to get the Burns unit to equal his standard setup.
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post #28 of 126 (permalink) Old 02-19-2019, 09:34 AM
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For those of us on the sidelines listening in, this is amazing knowledge transfer. Many thanks and please keep it going!
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post #29 of 126 (permalink) Old 02-19-2019, 10:09 AM
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I have the Spruel Headers in my 1750.

https://www.alfabb.com/bb/forums/eng...0-rebuild.html

The engine has 10:1 overbore Spruel pistons for ~1870 displacement
Custom shorter guides, and new seals. Narrow valve stems (BMW I think). Ported and matched to the intake. Work done by Progressive in WA.
Rj cams: Intake: 429, Exhaust: 776 (11.3 lift)
40DCOE webers with 34mm venturi

135hp @ 7400 rpm according to one dyno.

The issue with these headers so far is clearance and heat. They are coated but still throw a lot of heat and are close to the brake booster and air can for my cross over intake (Euro 68 GTV 1750). I've considered wrapping them or coming up with some sort of heat shield. Still torn on how to go there.

They look very cool and the sound is good except for a distinct drone at 4K. (Talked with Paul and it is common if you run a single silencer) I have the stocks pipes with the rear silencer and a stinger so I may opt to redo the pipes in the same diameter as the header (2.5" I think) and run two Borla or Magnaflow silencers. My friend says it sounds like a Ferrari when you go through the range.

68' Parisian Alfa GTV 1750

Last edited by BostonBertone; 02-19-2019 at 10:13 AM.
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post #30 of 126 (permalink) Old 02-19-2019, 10:19 AM
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@boston Bertone, does the heat generated by these headers affect the brake booster and braking as a result? TIA Fran

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