Straight or angled plugs

[GT63]

Is there a performance advantage\disadvantage with heads that have angled plugs vs straight plugs?

 

[ellis8500]

In all the reading I've done over the past few years I have never seen anything about straight vs angled plugs regarding one being better than the other. I have read where the angle of the plugs might interfere with the install of some headers. This is a definite problem with the Ford GT40P heads. I'm sure more knowledgeable people will chime in on this. Maybe we'll both learn something new.

 

[putz]

Here is a link to a discussion on this very topic.
Angled VS straight

 

[ellis8500]

Well I learned something new. Checked my stock Ford E7T heads and the plug is angled toward the exhaust valve. Now I know why it was designed that way.

 

[Screaming Metal]

plain and simple....flame travel, quence area and valve placement and size all determine horses. One on the most sought after heads were the early Chevy FI and angle plugged, double hump heads. If you were racing or into high performance, it was the only way to go....well....besides the Hemi's.

 

[Mike]

As noted earlier, be careful with an angled plug head and most street headers, as they won't play well together.

If you're not the type to index spark plugs, I wouldn't waste my time with an angled plug head casting. No sense worrying about flame travel, if you're not going to index the plug into the chamber properly.

S.M., there are still people thinking those heads are the hot lick. With all of the aftermarket heads available, why would anyone want those old castings today? Milled to within an inch of their lives, a dozen valve jobs, sinking the seats into the chambers and people still think they're a deal?

How many of you remember the days of converting straight plug heads to angle plug? We still had one of the tool kits when the shop was sold, but we only had 5 or 6 of the plugs left.

 

[RPM]

As noted earlier, be careful with an angled plug head and most street headers, as they won't play well together.

If you're not the type to index spark plugs, I wouldn't waste my time with an angled plug head casting. No sense worrying about flame travel, if you're not going to index the plug into the chamber properly.

S.M., there are still people thinking those heads are the hot lick. With all of the aftermarket heads available, why would anyone want those old castings today? Milled to within an inch of their lives, a dozen valve jobs, sinking the seats into the chambers and people still think they're a deal?

How many of you remember the days of converting straight plug heads to angle plug? We still had one of the tool kits when the shop was sold, but we only had 5 or 6 of the plugs left.

Yep remember all that, way back in the day. Then there was angle milling. Cut .100-.150 off the exhaust side of the head and nothing on the intake side.

 

[Screaming Metal]

Yep, that was back in the old days, I agree with both of you. With all the alum. heads, they can be purchased with optimized features the twisted chambers to permote flame travel, unshrouded valves, indexed chamber centerlines, CNC Porting so the ports are within 5 cc's of each other, and all the other good stuff.
We've come along way the past 25 years in street performance....and on the track.