OK folks,
I know this may sound like a stupid question, but how do I know if my heads have straight or angled plugs? Its a 400sb built between 70-72. TIA,

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Honey, its not a $200 hat. The distributor was $200, the hat came with it. kevin d
Maryland Chevelle Club #362
Classic Cars and Trucks of Beaufort #72

Kevin,
No production vehicle ever came with angle plugs. They were only available on over the counter performance heads like the old 292's etc. If the plugs go straight into the head, perpendicular to the exhaust flange, they are straight. If they are on about a 15 degree angle forward and back, they are angle plugs.

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Bill Koustenis
Advanced Automotive Machine
Waldorf Md

1971 Heavy Chevy - original owner
Team Chevelle #100

[This message has been edited by BillK (edited 06-08-2000).]

Thanks Bill!

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Honey, its not a $200 hat. The distributor was $200, the hat came with it. kevin d
Maryland Chevelle Club #362
Classic Cars and Trucks of Beaufort #72

what is the purpose of angled plugs??

Buddy,
The angled plugs are supposed to put the spark plug tip in a better position for proper combustion in a performance motor. On a stock or mildly modified motor it probably does not make enough difference to worry about.

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Bill Koustenis
Advanced Automotive Machine
Waldorf Md

1971 Heavy Chevy - original owner
Team Chevelle #100

bill

when you say that no production motor ever came with angle plugs i presume you speaking of only SB and not BB??

that is correct isnt it??

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Rich
Cocoa Beach, Fla
Team Chevelle #380
46 but feeling like 20 when i'm in my 70 SS 454
wa3men@aol.com
www.chevelles.com/showroom/70_SS_454.jpg (http://www.chevelles.com/showroom/70_SS_454.jpg)

Since Kevin was talking about a 400 small block I'd assume Bill's response was referencing small block heads. I'd give him the benefit of the doubt on this one - especially since he knows a few things about this stuff.

I do not doubt bill..
just trying to clarify/absorb some of his knowlegde in my own mind

i didnt know that no SB came with angle plugs but i am of the impression that many BB did...this is what i am asking

did BB come with both and was there a correlation between performance and plug type??

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Rich
Cocoa Beach, Fla
Team Chevelle #380
46 but feeling like 20 when i'm in my 70 SS 454
wa3men@aol.com
www.chevelles.com/showroom/70_SS_454.jpg (http://www.chevelles.com/showroom/70_SS_454.jpg)

[This message has been edited by 70 SS 454 (edited 06-14-2000).]

Rich,
All big blocks have the plugs angled. There is no "straight plug" head that I know of for the big block.

Only the small block had different spark plug angles. All stock/factory small blocks have straight plugs. As Bill said, the angle plug heads were available only over the counter.

And don't confuse straight and angle. It is not that angle is better than straight or straight better than angle; it is where the tip of the spark plug is placed in the combustion chamber that makes one "better" than the other. All SB could have come with angle plug heads and moving them to straight made the combustion process more efficient.

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-Mark

1967 Chevelle SS396/375
1964 Chevelle 283/195
1971 Vega 350/400

Actually registered 10/98

[This message has been edited by 1BadRat (edited 06-15-2000).]

thanks for the info mark!

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Rich
Cocoa Beach, Fla
Team Chevelle #380
46 but feeling like 20 when i'm in my 70 SS 454
wa3men@aol.com
www.chevelles.com/showroom/70_SS_454.jpg (http://www.chevelles.com/showroom/70_SS_454.jpg)

Rich,
Yes I was speaking of the Small Block heads. Maybe we can figure out a way to make some straight plug Rat heads http://www.chevelles.com/forum/smile.gif


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Bill Koustenis
Advanced Automotive Machine
Waldorf Md

1971 Heavy Chevy - original owner
Team Chevelle #100