Three ?'s about GT40 heads

[Teddyzee]

FYI: The GT40 heads were also used in marine applications from 1989-on.

And Gen1 Lightnings, if that was not mentioned.

 

[shane96ranger]

And Gen1 Lightnings, if that was not mentioned.

Seems to me that I remember hearing that to use these heads, you have to use bushings for larger head bolt holes.

Is this so Teddy?

 

[BlueChariot]

Two things here: First is the stock cam in the Vic motor sucks. Big time. The Explorer cam is better by a long shot. Which brings us to the second thing: The Vic's pistons do not have valve reliefs, which may get you into piston to valve contact, depending on the cam profile. The "sploder cam (this is called the F4TE by Ford and was also used in the 94-97 5.0's and 5.8's in truycks and vans) will likely be OK here, but you still need to verify the clearances before running the motor. An HO cam will also likely be OK with this combo. Anything bigger in profile will definately be a no-go. On the plus side the Vic's FEAD (Front End Accessory Drive) is one which many have used in these swaps. But if you can grab an Explorer's FEAD (everything from the timing cover forward, the timing covers on these are unique to the waterpump so you'll need it, it was also used on only a couple of other applications as well.) do that instead, it'll gain you much needed room for a radiator and fans.

I completely forgot about the possibility of interference. I'll be sure to check on that. I'd hate to of found out about possible interference th hard way.

 

[shane96ranger]

On the plus side the Vic's FEAD (Front End Accessory Drive) is one which many have used in these swaps. But if you can grab an Explorer's FEAD (everything from the timing cover forward, the timing covers on these are unique to the waterpump so you'll need it, it was also used on only a couple of other applications as well.) do that instead, it'll gain you much needed room for a radiator and fans.

He's keeping it in the Crown Vic. This recommendation is if it was going into a Ranger, isn't it?

 

[shane96ranger]

I completely forgot about the possibility of interference. I'll be sure to check on that. I'd hate to of found out about possible interference th hard way.

The motor I got my heads off of was offered to me as it sat, accessories and all, for $450 (them pulling the motor too). It only had 68,000 miles and I've been kicking myself in the ass for a while about not getting it and building it.

EDIT: I wasn't finished.... my phone thought I was though.

Anyway, the stock exhaust valve is the same size on the P heads, and the intake valve is only slightly larger. Staying with a stock cam (or even using the F4TE) in the Vic, I seriously doubt you'd run into problems.

 

[BlueChariot]

I'm gonna swap cams eventually, but it puts me at ease that i might not have to swap cams immediately.

 

[Teddyzee]

Seems to me that I remember hearing that to use these heads, you have to use bushings for larger head bolt holes.

Is this so Teddy?

Yes, the 351 uses larger head bolts. There are bushings commonly available, as you said. I think I've heard on SBFTech.com that it would be fine without them, the dowels will locate the head just fine. Who knows.

 

[BlueChariot]

Just for 100% clarification, the crown vic is keeping its motor, it will be my DD maybe in a few years I'll swap in a 351 later down the line. The vic just sort of fell into my lap sooner than expected. I will be hunting for a first gen Ranger as a project truck after I get employed.

 

[shane96ranger]

I ran across this chart and thought you might be interested Blue Chariot.

 

[BlueChariot]

Thanks again! I love data, charts, manuals, they're always useful.

Edit: I'm assumng the "Over Stock" percentage means 1.something X stock and not over 2X+ the flow with each one, correct? lol

Edit again: I haven't slept in over 35 hours, so now I have no clue if my mental math is accurate...

 

[shane96ranger]

Thanks again! I love data, charts, manuals, they're always useful.

Edit: I'm assumng the "Over Stock" percentage means 1.something X stock and not over 2X+ the flow with each one, correct? lol

Edit again: I haven't slept in over 35 hours, so now I have no clue if my mental math is accurate...

I see what you mean. For this chart, the stock figures would be 100%. So take for instance the intake on the P heads say 131.8% - which would mean an average of 31.8% increase over stock.

 

[BlueChariot]

I see what you mean. For this chart, the stock figures would be 100%. So take for instance the intake on the P heads say 131.8% - which would mean an average of 31.8% increase over stock.

That's what I figured. You know what kind of extra increase I might see after some light port/polishing?

 

[Psychopete]

Don't assume you have e7te heads, just looked at an early 90s vic motor I have lying on my garage floor and the heads were stamped with S - E6SE. E7TE would be better then what is there if it has E6SE heads, dime a dozen too.

 

[BlueChariot]

Don't assume you have e7te heads, just looked at an early 90s vic motor I have lying on my garage floor and the heads were stamped with S - E6SE. E7TE would be better then what is there if it has E6SE heads, dime a dozen too.

My year was the last year year for this generation as well as the 302 in the Vic's. What year is your motor?

 

[Mac]

Shane, I have saved a lot of head flow charts but this one really is the best with the added flow %. I'd rep you also but it said I have to wait!
Dave of the Nord - back to fencing---------------