I will be running headers. What is the best to run with them? Straight, Angle or L98 Angle and what is the difference?

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91 Z28 5.7l Camaro
T-56, Cross Drilled Brakes, KYB's,AFPR, 3.73 Gears, Borla Adjustable Cat Back, Hypertech Chip, Hooker Headers.
more to come....
My 91 Z28

 

It depends on the headers you get. Most headers are designed around the straight plug heads but some headers are made to fit either (we have the Headman headers and they will fit either). The differance in design is realy a matter of personal preferance. There is no performance differance between the 2 heads and the angle plug heads are just harder to get headers for. The whole thing about the angle plug heads was started back in the 60's and it was to place the spark plug closer to the center of the combustion chamber. If you look at the after market heads now and compair the spark plug locations between the angle plug heads and the straight plug heads you will see that they are in the same place so this thery no longer applies. So to answer your question save youself some trouble and get the straight plug heads because the angle plug heads are alot of hasel for no reason.

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82 Z28 with 350.motor has .030 forged flat top pistions other wise stock bottom end, Summit 214/224 cam with 1.6 Harland Sharp roller rockers, stock 882 heads for now (will be getting a set of the 23 degree Trick Flows this summer), Performer RPM intake, Holley 750 Vacuum secondary, Th350 with 2200 converter, stock 3.23 geared rearend for now (getting 9" later on), Headman shorty headers, custom 2.5" into 3.5" Y pipe into M.A.C. offroad pipe and M.A.C. cat back system. So far car has only been to the track twice and is having sever traction problems but is running 60'-2.34 1/8 mile-9.2 @ 79 MPH.

 

From what I've read on the subject so far, the most efficient combustion is achieved by moving the plug closest to the hottest part part of the chamber - the exhaust valve. Igniting the hottest part of the mixture - which is near the exhaust valve - results in a faster and more complete burn. Of course, I think you'd have to index the plugs so that the spark is pointed at the exhaust valve(which is something you can do with straight plug heads as well), otherwise you might negate the advantage of location.

 

I've got the AFR 190's w/angle plugs and Hooker Super Comp 13/4" headers. No problem with plug installation or interference.

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D&Z Performance
"Putting Power to the Pavement"

 

I have a set of vette angle plug heads to put on and I have slp headers. I have looked at them and I dont think I will have any extra problems with the anle heads over the straight plugs. It may be even a little easier for a few of the plugs.

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If the women don't find you handsome they should at least find you handy
88 GTA Notchback with 91 gfx and ROH Snypers
Aftermarket T-56 (pain in the A$S but worth it)
Lots of things to do still

 

What's the difference between the regular angle heads and the L98 angle heads? I've heard that there are no clearance problems for SLP headers with the L98 angle heads. Can anyone confirm this?

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Riccioli Performance Motorworks

--RPM Racing--

-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, either AFR or Trick Flow heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??


***** Flyby: (n) When you let off the throttle after beating a ***** Racer by a few car lengths and he then blows by you in an attempt to convince you he really won the race.

 

I have AFR heads with L98 angle plugs and SLP headers and the plugs are easy to get to. No fitment problems whatsoever.

Tim

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• Program your own PROMs!. Read my article to get started!
• Research and Experiment before asking questions.
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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
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