Explorer 5.0 swap, gt40p exhaust help

[Stangman92]

Hey guys, in the middle of collecting parts for my 5.0 swap. Bought a '97 5.0 engine. Upon teardown I found out it has gt40p heads. No big deal, as they flow better than standard gt40's. My question is I have a new set of explorer cast manifolds and the Hedman 88400's. The cast manifolds are Dorman replacements. They are garbage! Pulled them out of the box and one port was cast shut! I few taps with the chisel and it was free, but the ports are tiny, I can hardly get my pinky finger in the ports. The Hedman headers are nice, but we all know they dont clear 2 plugs on the gt40p heads. This is for a daily driver, occasional offroader, so I need as much low end torque as possible. I can port, weld and fab. What should I do; port the cast manifold, or fab the drivers side Hedman header to clear the spark plugs?

 

[dSINtia]

Stangman,

I have no experience with the 88400's but recently wrapped up a 5.0 swap in an 88 B2 using a 96 motor with the GT-40p heads to be used as a DD for my son and the low end torque with the stock cast manifolds is exceptional in comparison to the V6. I honestly can't imagine needing more but if needed I'll get the feeling of more torque when I install the 8.8" rear diff maybe going to something shorter than what the 7.5" that's in there right now has.

 

[Rowdy Fitzgerald]

http://www.stans-headers.com/parts.htm

Here's a site that offers all the parts for diy headers.

And here's a flange kit that'll fit the gt40p.

http://m.ebay.com.au/itm/181591167076?_mwBanner=1


Sent from my iPhone using Tapatalk

 

[Stangman92]

I followed your build, dSINtia. I appreciate the quick responses tonight guys. I wonder which would yeild more low end torque, ported cast manifolds, or 1 1/2" tubular headers? Has anyone made this kind of switch? Obviously the ported cast manifolds would keep velocity up, which would in theory, keep low end torque as high as possible, correct? Thanks guys.

 

[dSINtia]

I'm not sure where but I remember reading during my research prepping for my truck that the tubular headers didn't flow as well as the cast stockers. Not sure if that is fact or opinion but the unported cast manifolds flow great for a DD... IMO.

 

[RangerSVT]

The cast manifolds, even in stock form, outflow the stock headers even on a good day. Porting the cast manifolds will be more than enough to handle up to 300 hp...

SVT

 

[Stangman92]

Thanks for the response guys,
It seems the general consensus is to port the cast manifolds, versus modifying the Hedman 88400's. Any other opinions?

Happy Thanksgiving guys, be safe!

 

[RangerSVT]

Yep, but open your wallet. The torque monster headers...

SVT

 

[Stangman92]

Thanks for the help, torque monsters are out of the budget for now. Who needs a set of Hedman 88400's??? Lol

http://www.therangerstation.com/forums/showthread.php?t=157630