explorer gt 40p heads???

[armyjon]

Have a set of the explorer gt40p heads coming from a 98 explorer. My question is how much lift will these hold? Am wanting to install the trick flow stage 2 which has 540 ish int and 560 ish ex which duration no more than than 232@50 i believe

 

[Chietala]

I'd take a head down to the local machine shop and have them check when the springs bind. It will only take them a minute.

 

[v8only]

stock valve springs are garbage, unuseable with anything other than the truck cam they came with.

 

[armyjon]

ok so the real question i guess is actually, what do i need to do to get more lift on the heads. change the springs, raise rocker arm ratio, longer valves? Anybody know

 

[SPEEDYLIFSAVR]

put some trickflow springs on there(Summit sells a nice kit) and 1.7 rr's . stock valve length will be fine .

 

[90topdown]

Springs are important but the real question is how much lift your pistons will take.

Make sure you check the PTV clearance with any cam over .500 lift.

 

[Mr. Rustypwnz]

agreed the stockers are crap at best, get some crane or tfs springs, I have some cranes on mine and they work flawlessly! To increase the lift you get a bigger cam, dont get all the other crap like rockers, they dont add the power like a cam will, and plus it will sound badass!! get some headers that are specific to these heads as well mac and frpp have a great set!!