Gt40p Heads With Stock H.o. Roller Cam

DM87GT · Jun 17, 2014

Hello, I am in the process of bolting on a nice pair of GT40P heads on my 1987 Mustang GT with the matching upper/lower GT40 intake. My question is: Would the GT40P valve springs handle the stock .444 lift H.O. roller cam? Or would I have to change the springs? The heads and intake are from a 1999 Explorer. Any advice is greatly appreciated. Thanks

RangerJoe · Jun 17, 2014

Not a great idea to run them. I would go ahead and change them. They are 15 year old springs, designed for a lesser cam with lesser rpm's. Upgrading would be a good investment.

Joe

stykthyn · Jun 17, 2014

Upgraaaayed

mikestang63 · Jun 17, 2014

stykthyn · Jun 18, 2014

Oh the irony

mikestang63 · Jun 18, 2014

stykthyn said:
Oh the irony

Right? Orange can O' death. Who knew 40 years ago.

stykthyn · Jun 18, 2014

Pay me now and pay me again later

mikestang63 · Jun 18, 2014

Funny. I've been running a FL1A for over 30 years.

fords2live · Jun 18, 2014

Crane cams valve springs. 44308-1. Awesome set of springs, and they're. Designed for factory heads. Had a .544 lift cam and would twist 7k no problem. Summit Racing $170

mikestang63 · Jun 18, 2014

I used the TFS valve springs Summit sells.

marc.riffle.5 · Jun 18, 2014

Alexparts.com sells a upgrade kit and the price is reasonable.

Gearbanger 101 · Jun 19, 2014

mikestang63 said:

Holy Crap....Fram Filters were $4 in 1972!?! That was a fortune back then! And I'd gladly pay $200 for a main bearing job today. That wouldn't even cover a fraction of the labour to now a days.

marc.riffle.5 said:
Alexparts.com sells a upgrade kit and the price is reasonable.

Agreed....best bang for the buck springs right there.

Pretty hard to beat springs, retainers and locks for $95

http://www.alexsparts.com/valve-spr...-and-1-6-or-1-7-ratio-rockers-up-to-480-lift/

DM87GT · Jun 19, 2014

Gearbanger 101 said:
Holy Crap....Fram Filters were $4 in 1972!?! That was a fortune back then! And I'd gladly pay $200 for a main bearing job today. That wouldn't even cover a fraction of the labour to now a days.

Agreed....best bang for the buck springs right there.

Pretty hard to beat springs, retainers and locks for $95

http://www.alexsparts.com/valve-spr...-and-1-6-or-1-7-ratio-rockers-up-to-480-lift/

Thanks for all the helpful replies. Just picked up the GT40P drop-in valve springs that are good up to a .544 lift through Alexparts. com One last question: What can I expect after the GT40 upper/lower intake and the P heads are installed? I also picked up a 1 inch spacer that sits between the upper and lower intake. I am running a built AOD with a manual valve body and TCI 2500-3000 stall. Aluminum driveshaft with the 8.8 rear and 3.73s The 302 was rebuilt about 3 years ago with 21,000 on the motor, currently running the stock EFI upper and lower intake, 70mm TB, BBK cold air intake through the fender, 19lb injectors, stock H.O. roller cam w/.444 lift. BBK shortys, stock E7TE heads that have been reworked. Flowmaster exhaust, no cats!

Gearbanger 101 · Jun 19, 2014

The heads and intake alone are probably good for about 30-35hp over what you're making now...most of which will show up in the mid and top end regions. Don't forget to send the heads in for a good valve job and have the guides check for wear. Some of these old GT40 heads have a lot of miles on them.

Dave2000GT · Jun 20, 2014

I just did this. GT40p heads, explorer intake with stock cam. I also added 1.7 roller rockers. My intake was dirt cheap just 60 bucks, heads were 100, but my machining costed 500 plus 100 for springs (valve job, milled, springs, fixed bolt hole, and cleaning for them and intake), so for 700 maybe aluminums would have been better from a financial standpoint, but who knows, I actually dont regret it. They are solid and added a noticeable kick in the butt, but not anything insane. Car occasionally busts loose in 2nd from a roll, thats with stock 3.08 rear gears too, and would never have done that before. I like the mental part of having Ford parts and irons that wont bust as easily as aluminum. Car did a 13.8@102 after the swap, no before time but I would have to think mid 14's at best being basically stock except for exhaust. I would say just do the springs and not worry about it. Even if the stockers are OK, bit better springs will probably help with upper rpm power.

sen2two · Jun 21, 2014

What headers are you guys running with the P heads? I'm looking for a long tube set that will work with the P heads.

DM87GT · Jun 21, 2014

I am using BBK ceramic coated shortie headers on my foxbody, which are still bolted to the stock E7 heads. I have GT40P heads that are going on the motor soon, and my headers will work without any issues. BBK and MAC, also Ford Racing headers will bolt up with no clearance issues. Some of the header applications require a 90 degree angle sparkplug boot on some of the spark plug locations. You will just have to check to see which ones they are. They also sell the specific "P" headers specifically made for the P heads, but are a little pricey around $300 on up. Hope this helps!

sen2two · Jun 21, 2014

I have a set of MAC shorty headers on there now. I prefer long tube headers, but if these will fit with no issues, I'll use them for now.

stykthyn · Jun 21, 2014

Bbk and frpp headers will fit without issue. Can't comment on other brands.

7991LXnSHO · Jun 23, 2014

Bbk and Frpp to you too! Did @stykthyn eat too many Dtl's?
Now back to your regular thread.

Gt40p Heads With Stock H.o. Roller Cam

DM87GT

Member

RangerJoe

I leave the horn on while driving

stykthyn

I want to measure mine. It doesn't look that tall.

mikestang63

stykthyn

I want to measure mine. It doesn't look that tall.

mikestang63

stykthyn

I want to measure mine. It doesn't look that tall.

mikestang63

fords2live

Member

mikestang63

marc.riffle.5

Member

Gearbanger 101

Straight Outta Locash

DM87GT

Member

Gearbanger 101

Straight Outta Locash

Dave2000GT

Active Member

sen2two

I've been lubing and pulling it all morning

DM87GT

Member

sen2two

I've been lubing and pulling it all morning

stykthyn

I want to measure mine. It doesn't look that tall.

7991LXnSHO

wanna catch the space herp

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Gt40p Heads With Stock H.o. Roller Cam

Member

I leave the horn on while driving

I want to measure mine. It doesn't look that tall.

I want to measure mine. It doesn't look that tall.

I want to measure mine. It doesn't look that tall.

Member

Member

Straight Outta Locash

Member

Straight Outta Locash

Active Member

I've been lubing and pulling it all morning

Member

I've been lubing and pulling it all morning

I want to measure mine. It doesn't look that tall.

wanna catch the space herp

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