[Siegedg505]

I have a seat of GT40 Heads that are in need of rocker arms, springs and valves. My question is can the stock E7 valve train be placed on the GT40 heads?

[Ohsplat]

Originally Posted by Siegedg505 I have a seat of GT40 Heads that are in need of rocker arms, springs and valves. My question is can the stock E7 valve train be placed on the GT40 heads?

Nope. I believe the valves are larger. Have you checked the valves to see if they are bent or bowed? I have taken many sets off junk yard vehicles and have always had to replace the springs and seals, never had to replace the rockers or valves.

[1988 5.0]

do them gt40 heads fit a 98 4.6gt cause my friend told about them.

[cleangtvert]

Originally Posted by Siegedg505 I have a seat of GT40 Heads that are in need of rocker arms, springs and valves. My question is can the stock E7 valve train be placed on the GT40 heads?

i was kinda wondering if i could use the springs from the e7'si have (46k miles)on the p's i have with stock cam

[BULLET20XD]

Originally Posted by 1988 5.0 do them gt40 heads fit a 98 4.6gt cause my friend told about them.

No, the GT40s are OHV heads, The 4.6 is a OHC 2v motor.

[1988 5.0]

ok thanks just wondering so wuts the best heads i could go with

[Smirnoff]

Originally Posted by cleangtvert i was kinda wondering if i could use the springs from the e7'si have (46k miles)on the p's i have with stock cam

you could if you love valve float, don't be a cheap bastard go spend a couple bucks on new springs

[BULLET20XD]

Originally Posted by 1988 5.0 ok thanks just wondering so wuts the best heads i could go with

If you have a 5.0 then Gt40s or Gt40p heads, if you have a 4.6 i have no clue. OHC is the new standard on engines nowdays. Less friction in the motor and less chance of a failure, even at high rpms. OHC motors will turn higher than a OHV motors anyday.

[cleangtvert]

Originally Posted by BULLET20XD No, the GT40s are OHV heads, The 4.6 is a OHC 2v motor.

gt 40's or gt40p's are not ohv

[cleangtvert]

Originally Posted by Smirnoff you could if you love valve float, don't be a cheap bastard go spend a couple bucks on new springs

yeah i know i think a spring kits only $120

[BULLET20XD]

Originally Posted by cleangtvert gt 40's or gt40p's are not ohv

Do some research, ANY Ford windsor head is a OHV head/engine! Ford has not built a OHV engine since they dropped the Explorer 5.0 in 2001. The OHC engine started in the Crown Vic in early 90s then the Mustang in 96. OHV means Over Head Valve. OHC means Over Head Cam. GT40s do not have a cam on top of them!!

[BULLET20XD]

Originally Posted by cleangtvert gt 40's or gt40p's are not ohv

Here you go


An overhead valve (OHV) engine, also informally called pushrod engine or I-head engine, is a type of piston engine that places the camshaft within the cylinder block (usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine), and uses pushrods or rods to actuate rocker arms above the cylinder head to actuate the valves. Lifters or tappets are located in the engine block between the camshaft and pushrods.[1] The more modern overhead camshaft (OHC) design (still literally overhead valve) avoids the use of pushrods by putting the camshaft in the cylinder head.

yes they are OHV!!!

[1badcob]

Home boy is right! Good job bro but to answer the real question as a fact... No the gt 40's will not go on a 4.6 anything!!! Gt 40's are pretty good heads for a good power increase but it just depends on how much you wanna spend. Edelbrock or AFR is two of the best! Proven

[mdbstang]

To the OP,if the gt-40 heads have strait valves don't get new ones.All i did to mine was clean them good make sure they are flat and lapped the vavle seats,then i put good valve stem seals on them and got a set of springs locks and retainers from thumper.You have to run good springs if you have an aftermarket cam.Even if you use the stock cam i recomend decent springs.I have seen people run them with stock E7 srings and rocker on a stock set up but the valves will not fit.Let me know if i can help any more

[cleangtvert]

duh sorry it was a long day at work yesterday lol. iwas thinking ohc. i went to bed just after that post. must have been half asleep.

[BerniniCaCO3]

hah, yes, the popular use of OHV has always bothered me!

Pretty much every engine ever made has been over head valve in at least the last 40 years, and has been dominant I think since Chrysler invented it.

Overhead cam engines are still overhead valve engines, they're just a subset thereof. The valves are still in the head-- as opposed to being located outside of the end, next to it! As in the side valve engine.

The other option was a side valve engine... the valve was parallel to the head, and the air came into the cylinder head from the side rather than from the top.
However, this meant the air made at least a couple extra elbows, really restricting airflow and adding resistance, which is bad for fuel efficiency as well as raw power.

The reason to make a side valve engine was machining geometry, they were easier to make until methods got better.

If it's not overhead cam, I prefer calling them pushrod engines: more accurate and technically specific than overhead valve!