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...How does the heat shield work? Headers look great!
Woosh! VERY NICE!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...)
*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...)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.
peak power at 7400 is extremely high for a street motor. 135hp at reckon at the wheels?I have the Spruel Headers in my 1750.
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.
How did he measure RPM? The right way is from an ignition pickup. A less satisfactory method is where the operator "calibrates" from the roller rpm. If he overestimates it you get inflated HP (torque * rpm) and rpm. If he underestimates it you get low HP and a great torque curve at low rpm.135hp @ 7400 rpm according to one dyno.
On our fall tour in November I had a couple (visiting profs from Italy, I think) following me because they liked the sound my hot-rod Super made with its c/r gears and stainless Alfaholics exhaust. That was fun and it does sound good when driven hard. Then my motor blew up: cracked head, blown head gasket, sundry failures, etc. We're doing a rebuild now . . .For a street car, my gut tells me go w a stainless system n then go drive it.
My comment was made because TS seems to have no interest in performance from headers. So I recaal a job I did for a GTV 2000 from a friend of mine. He wanted nicer deeper sound , no screamer. So we just made a mufflerless tailpipe in ED 60 , thick wall. Result nice deep sound, and on a trackday much nicer sound than many cars with headers.Woosh! VERY NICE!
*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.)
My comment was made because TS seems to have no interest in performance from headers. So I recaal a job I did for a GTV 2000 from a friend of mine. He wanted nicer deeper sound , no screamer. So we just made a mufflerless tailpipe in ED 60 , thick wall. Result nice deep sound, and on a trackday much nicer sound than many cars with headers.
total investment a few bob for the pipe, and some welding by myself.
So if sound is the thing, and performance does not matter why spend a lot on a header..