lightning heads

[Lang]

Hey, Is there any advantage to using the heads off the 351 lightning trucks or are they the same as the gt-40's or gtp's?

Thanks

 

[Mustang5L5]

I beleive they are GT-40 heads

 

[TheBocSez]

Hey, Is there any advantage to using the heads off the 351 lightning trucks or are they the same as the gt-40's or gtp's?

Thanks

They are GT40 Heads, the down side of using them from a Lightning instead of a Cobra are

1. They have 1/2 inch bolt holes so you will need step washers or bolts. (not a big deal)

2. They have a larger combustion chamber 69cc I believe which will lower your compression ratio depending on your pistons to under 9.0:1.

You could mill them, but it would have to be a lot to bump the compression back up and for the amount you would spend, I would go with some GT40P's and new headers needed to make em work.

 

[85_SS_302_Coupe]

They are GT40 Heads, the down side of using them from a Lightning instead of a Cobra are

1. They have 1/2 inch bolt holes so you will need step washers or bolts. (not a big deal)

2. They have a larger combustion chamber 69cc I believe which will lower your compression ratio depending on your pistons to under 9.0:1.

You could mill them, but it would have to be a lot to bump the compression back up and for the amount you would spend, I would go with some GT40P's and new headers needed to make em work.

+1. I'm in the same boat though with some '69 351W heads....they're ported and polished really nicely though, probably will out perform P heads, but they need a new set of valves....

 

[R2D2]

+1. I'm in the same boat though with some '69 351W heads....they're ported and polished really nicely though, probably will out perform P heads, but they need a new set of valves....

how about some aussie 2v closed chambers?


LOL j/k man

 

[f4fntm]

The low compression would be fine with forced induction, no?

 

[85_SS_302_Coupe]

how about some aussie 2v closed chambers?


LOL j/k man

Nah screw that, i'm all about some Boss canted valve heads

 

[TheBocSez]

The low compression would be fine with forced induction, no?

Sure. The lower compression would allow more boost with less chance of detonation and the lightning was supercharged.

 

[rd]

I believe they have the 62-64 cc chambers like other GT40s.

I have a set on my 82, milled a bit, and they were a big step up from stockers.