gt-40p and thermactor air

homeroV8 · 11-11-2002, 05:52 PM

The boys at Central Coast said they perform this mod. What does it mean, and my car will need this to run properly? Will it affect heads potential?
Does Summit provide this if needed?
Thanks for any info.

7000rpmisheaven · 11-11-2002, 05:57 PM

There is a thermactor passage in the back of each head. They are there for emissions. The GT-40Ps came on the explorers and are are set up to be an emission legal head. Some aftermarket heads don't have the passage and you would have to remove the smog pump and some of the stuff with it.
Having them won't make a noticable change in performance. I you need to stay emissions legal I would stick with it.

homeroV8 · 11-12-2002, 04:18 AM

Glad to know, thank you.

homeroV8 · 11-12-2002, 04:22 AM

One more thing: Summit sells them for around $538 and Central Coast for $638. Any reason for these being $100 more?
Thanx again.

Fox Hound · 11-12-2002, 11:49 AM

CCM sells their heads with higher quality parts, especially the valve springs. I think the stock springs are rated for only .500 lift whereas the CCM one can go a little higher. Also the holes for the thermactor is an option with them. They usually don't have holes but they could drill them for you if you want to stay smog legal.

Agent_4573 · 11-12-2002, 12:12 PM

Or you could just drill and tap the head yourself. If you dont feel like doing that you could always just extend the wire for the air sensor and put it somewhere else.

http://www.nothingbutperformance.com sells the heads for 470 dollars.

homeroV8 · 11-12-2002, 06:22 PM

If the heads don´t have the holes, I can´t leave them this way? No rough idling or bad working engine or check engine light? And the smog equipment can simply be discarded?
Sorry for so many questions, but I just trust the experts on this site (lol)...

11-11-2002, 05:52 PM	#1
homeroV8 Registered Member Join Date: Jan 2002 Location: Orlando, Fl Posts: 37	gt-40p and thermactor air The boys at Central Coast said they perform this mod. What does it mean, and my car will need this to run properly? Will it affect heads potential? Does Summit provide this if needed? Thanks for any info. __________________ black 95 GT, 5 speed, MAC catback, BBK o/r h-pipe, FMS 3:73, GT40P mildly ported and polished heads, MAC p-headers, roller rockers, mildly ported and polished cobra intake, XE270 comp cam, 65mm Tb, 77mm Pro-M.

11-11-2002, 05:57 PM	#2
7000rpmisheaven Registered Member Join Date: Nov 2001 Location: germantown MD Posts: 283	There is a thermactor passage in the back of each head. They are there for emissions. The GT-40Ps came on the explorers and are are set up to be an emission legal head. Some aftermarket heads don't have the passage and you would have to remove the smog pump and some of the stuff with it. Having them won't make a noticable change in performance. I you need to stay emissions legal I would stick with it. __________________ 85 GT 4bbl roller cam 2 ch. Flowmasters, O/R H-pipe Performer intake and carb milodon water pump, FMS 9mm wires, aluminum driveshaft, king cobra clutch

11-12-2002, 04:18 AM	#3
homeroV8 Registered Member Join Date: Jan 2002 Location: Orlando, Fl Posts: 37	Glad to know, thank you. __________________ black 95 GT, 5 speed, MAC catback, BBK o/r h-pipe, FMS 3:73, GT40P mildly ported and polished heads, MAC p-headers, roller rockers, mildly ported and polished cobra intake, XE270 comp cam, 65mm Tb, 77mm Pro-M.

11-12-2002, 04:22 AM	#4
homeroV8 Registered Member Join Date: Jan 2002 Location: Orlando, Fl Posts: 37	One more thing: Summit sells them for around $538 and Central Coast for $638. Any reason for these being $100 more? Thanx again. __________________ black 95 GT, 5 speed, MAC catback, BBK o/r h-pipe, FMS 3:73, GT40P mildly ported and polished heads, MAC p-headers, roller rockers, mildly ported and polished cobra intake, XE270 comp cam, 65mm Tb, 77mm Pro-M.

11-12-2002, 12:12 PM	#6
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	Or you could just drill and tap the head yourself. If you dont feel like doing that you could always just extend the wire for the air sensor and put it somewhere else. http://www.nothingbutperformance.com sells the heads for 470 dollars. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

11-12-2002, 11:49 AM	#5
Fox Hound Registered Member Join Date: Nov 2001 Location: Bay Area, CA Posts: 58	CCM sells their heads with higher quality parts, especially the valve springs. I think the stock springs are rated for only .500 lift whereas the CCM one can go a little higher. Also the holes for the thermactor is an option with them. They usually don't have holes but they could drill them for you if you want to stay smog legal.

11-12-2002, 06:22 PM	#7
homeroV8 Registered Member Join Date: Jan 2002 Location: Orlando, Fl Posts: 37	If the heads don´t have the holes, I can´t leave them this way? No rough idling or bad working engine or check engine light? And the smog equipment can simply be discarded? Sorry for so many questions, but I just trust the experts on this site (lol)... __________________ black 95 GT, 5 speed, MAC catback, BBK o/r h-pipe, FMS 3:73, GT40P mildly ported and polished heads, MAC p-headers, roller rockers, mildly ported and polished cobra intake, XE270 comp cam, 65mm Tb, 77mm Pro-M.