Angle plug v. Straight Plug

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Mar 2, 2006 | 03:55 PM

dgruenke

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Drifting

Joined: Apr 2002

Posts: 1,716

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From: New Baden Illinois

Angle plug v. Straight Plug

Is there any performance difference between an angle spark plug head and a straight spark plug head?

How do you decide which type to use?

Thanks everyone.

Mar 2, 2006 | 05:11 PM

Hauq`

Instructor

Joined: Sep 2005

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From: St Louis Missouri

Yes; heads with angled plugs have smaller combustion chambers and therefore higher compression. This is not a rule, but a generality. Heads with straight spark plugs are usually round the 76 cc area for SBC.

Mar 2, 2006 | 06:31 PM

dgruenke

Thread Starter

Drifting

Joined: Apr 2002

Posts: 1,716

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From: New Baden Illinois

But a lot of the heads that I looked at give you the option to pick straight or angled and both have options have the same combustion chamber. How is this?

Mar 2, 2006 | 07:20 PM

Simmo

Pro

Joined: Jan 2004

Posts: 535

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From: Darwin, Australia NT

The angle plug head was originally introduced by GM for more power for motors with a domed piston. The bigger the dome the better the advantage, no dome no advantage.

Mar 2, 2006 | 07:46 PM

StickShiftCorvette

Drifting

Joined: Dec 2004

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I ran Chevy angle plug heads on my 11:1 CR 350/350 and they seemed to offer a lot more power than the stock 2.02's. I ran the stock cam and a Torker intake with a 600 Holley double pumper. The long block, heads, cam, lifters, valves, and springs were all bought new from Chevy.

Mar 3, 2006 | 06:34 AM

enkeivette

Melting Slicks

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I have them, Dave at AFR told me that they tend to make slightly more hp.

Mar 3, 2006 | 08:45 AM

1971corvette

Burning Brakes

Joined: Oct 2002

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Quote:

Originally Posted by torqvette

I have them, Dave at AFR told me that they tend to make slightly more hp.

I remember reading a long time ago they make about 5 - 10 more horsepower,this was on the old iron heads.

thinking about using angled plug heads,make sure the plugs will clear the exhaust or headers.
I am using dynomax full length under the car headers
part #289-86008 and have no problems with clearence on plugs,steering box ,and for $209.99 am very pleased with them.
I hope this helps you.

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