I'm ordering my AFR heads tomorrow and I want to make sure I'm getting the right plug angle. I will be running SLP 1 5/8 headers on my engine. I was planning on getting the L98 angle plug heads. Does this sound right for an 89 IROC-Z?

 

it's entirely your choice. Whatever you like best.

I run those same headers and I like the angle plug heads.

ODB


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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305 with iron #416 heads,
383 with aluminum TFS heads,
Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, Vigilante 2400 lockup converter, 3.25:1 Ford 9" rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, sometimes advertised at 216/219 @.050 112-LSA .462/.470 lift @1.5:1 ratio. Using Harland Sharp 1.65:1 roller rockers. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch. SouthSide machine subframe connectors, SSM lift-bars, Moroso 4" underdrive crank pulley.

N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99

 

I'd recommend the angle plugs if at all possible, as they put the spark closer to where it needs to be.

Look at a pic of the headers and see if the angled design will fit. Usually it makes the fit of the headers to the plugs more friendly, because the plug angles away from the exhaust port on the outside of the motor. You should check with the specific headers you're going to use though. Get a pic or drawing from SLP, or scope out a car that has them.

I think 1-5/8" headers would be a mismatch with the rest of your combo. I think you will give back most of what you are buying when you spring for those heads, by using the small primaries.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I already have the headers on my 305 so I was going to use them. If I feel they are choking me up, then I'll start searching for 1 3/4. I guess I'll go with the angle heads then.

 

I have a set of straight plug AFR 190s, 58cc, brand new still in the box I would like to sell. I work in Piscataway (centennial ave) right near boundbrook. If you would like to see these heads let me know.

I got straight plugs because all aftermarket 3rd gen headers will clear straight plugs. Lingenfelter claims there is no benefit to angle plugs, I'm sure there are others, just clearance headaches. Yes, there are many members running angle head plugs on this board too.

I am selling the heads because I am going to sell my Camaro.

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'92 Z28 Black 5.7L 5 Speed
'95 Competition Yellow Corvette Coupe ZF6

 

You guys with the Angle Plug heads are they just angle or L98 angle's?


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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.

 

Anyone???

 

Come on....nobody all day could answer this?