gt40 head ?

natedawgg94 · 09-03-2006, 06:20 PM

okay i've seen some info on here b4 but can't seem to find it now for some reason. k what i'm looking for is what is needed to put 351 gt40 heads on a 302 and also how big can you port these gakset wise? thanks for the info or if someone can direct me to the thread i've seen on here bout this b4 would be great..... thanks in advance.

Craig K. · 09-03-2006, 07:27 PM

I think that the 351 uses a larger head bolt size, other that that I don't think there is anything different

QWKSNKE · 09-03-2006, 08:03 PM

yep. You will need to buy some ARP headbolts that have are 7/16 diameter thread with a 1/2 shoulder beneath the head of the bolt.

You should be able to port them to a Felpro 1250 gasket size but I don't think it will be worth the effort and time. It takes a massive amount of time to port cast iron heads

Italian LX · 09-03-2006, 11:00 PM

Quote:

Originally Posted by QWKSNKE

yep. You will need to buy some ARP headbolts that have are 7/16 diameter thread with a 1/2 shoulder beneath the head of the bolt.

It's actually a neck-down adapter washer that is placed under the 7/16" head bolt.

I did this a couple years ago myself. I was going to buy the ARP adapter washers, however, the only way to get them was to buy them in a kit with their head bolts -- since I already had the ARP head bolts, I decided to save a little money and try a different manufacturer for the washers. The guy I was buying my stuff through at the time could only find them sold seperately by edlebrock.... so I bought them.

Well, they seemed to work fine, until I pulled the head only 6,000 miles later. As I tried to removed the washer out of the heads, I found that many of the washers were broke in half.

I'm not sure if the ARP washers would've performed any better, but I would definitely recommend trying the ARP ones and taking my chances.

natedawgg94 · 09-04-2006, 12:41 AM

thanks guys for the help. i agree lee on the time ittakes to port the cast heads i'm gonna end up just gasket matching and putting them on.

natedawgg94 · 09-04-2006, 12:52 AM

anyone happen to know the part # off hand i just looked and couldn't tell the difference. thanks in advance.

09-03-2006, 06:20 PM	#1
natedawgg94 Senior Member Join Date: Apr 2005 Location: Ohatchee, AL Posts: 713	gt40 head ? okay i've seen some info on here b4 but can't seem to find it now for some reason. k what i'm looking for is what is needed to put 351 gt40 heads on a 302 and also how big can you port these gakset wise? thanks for the info or if someone can direct me to the thread i've seen on here bout this b4 would be great..... thanks in advance. __________________ 1994 Cobra Pace Car #365 of 1000 light mods 1994 mustang GT 3.55's, 331 stroker, 75mm tb, 75mm maf, mac h pipe SOLD (ole yella u will be missed ((>>. Rubbing Is Racing

09-03-2006, 07:27 PM	#2
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	I think that the 351 uses a larger head bolt size, other that that I don't think there is anything different __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

09-03-2006, 08:03 PM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	yep. You will need to buy some ARP headbolts that have are 7/16 diameter thread with a 1/2 shoulder beneath the head of the bolt. You should be able to port them to a Felpro 1250 gasket size but I don't think it will be worth the effort and time. It takes a massive amount of time to port cast iron heads __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

09-04-2006, 12:41 AM	#5
natedawgg94 Senior Member Join Date: Apr 2005 Location: Ohatchee, AL Posts: 713	thanks guys for the help. i agree lee on the time ittakes to port the cast heads i'm gonna end up just gasket matching and putting them on. __________________ 1994 Cobra Pace Car #365 of 1000 light mods 1994 mustang GT 3.55's, 331 stroker, 75mm tb, 75mm maf, mac h pipe SOLD (ole yella u will be missed ((>>. Rubbing Is Racing

09-04-2006, 12:52 AM	#6
natedawgg94 Senior Member Join Date: Apr 2005 Location: Ohatchee, AL Posts: 713	anyone happen to know the part # off hand i just looked and couldn't tell the difference. thanks in advance. __________________ 1994 Cobra Pace Car #365 of 1000 light mods 1994 mustang GT 3.55's, 331 stroker, 75mm tb, 75mm maf, mac h pipe SOLD (ole yella u will be missed ((>>. Rubbing Is Racing