Ford GT40 GT40P Lunati Valve Spring Kit no machine work required
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- Опубліковано 4 жов 2024
- Good easy to install kit for GT40/GT40P cylinder heads from Lunati valve springs allow up to 570lift. Best part is no machine work required. Just install and go. Im not sponsored by any manufactures or brands. I paid for these my self. Just wanted to share with the ford community.
#ford #302 #351w #bronco #mustang #gt40 #gt40p #lunati #sbf #valve spring #budget #cast iron heads #ford Windsor
Wow, so not only do I have to worry about people in PA taking all the GT40 and GT40P heads, but now the Canadians are grabbing them too! But seriously, good video, thanks for the info.
Yes I see so many go for scrap metal it’s disturbing Lol. Thanks for the comment. Glad you enjoyed the video.
Thanks for this, I was hoping to find a set of drop-in springs for my junkyard GT40p heads, I scored a Comp Xtreme Energy XE274HR (.555/.565) for very cheap and from what I can tell these are going to work perfectly. Comp's own spec sheet advertises you to use either their "986-16" or "987-16" springs but specify the heads need to be machined to use them. I also thought it was weird that their "986-16" springs show to only handle .540 lift whereas the 987-16 handle .590. These Lunati's should do exactly what I need.
Good to hear this information helped you out. Thanks for watching the video.
👍👍👍😎
Thanks for video
Note: the retainer gets closer to the rocker arm when the valves are closed. Check for interference.
I've seen aluminum rockers with grooves worn into them because they hit the retainers.
Yes your right, thanks for letting me and everyone know that awesome tip. Glad you liked the video.
Your the man simple and sweet and includes part numbers! Thank you for taking the time to share.
I bought the same kit. Thank you for explaining the keepers I figured gold brass color ones were for the exhaust but was a 100 percent sure.
More than welcome. I saw lots of videos for other brands but none for these. Worth it if it helps anyone out.
Thanks alot Dood, i was wandering what i was going to do whit the GTP,s
They are good heads for cheap if you can find them. Better than most stock heads. I like mine.
I'm new to the whole science behind heads, I'm working on a 1984 f150 and I'm looking to convert to a hydraulic roller and get some junk yard heads. Looking to make a sold 350hp with it that's solid more so low end and mid range, don't need to go fast just cruise at 80 when I want to. Which kind of heads would I find more beneficial gt40p or gt40 heads? I'd take them into a machine shop and get them reconditioned with the block and use this spring kit
So you would like to find 1996 explorers heads the GT40s. They have a good spark plug angle. The GT40Ps are the same head but the angle of the spark plug is different so you may need special headers. So the plug isn’t to close the the header. I just heated my header up and indented it to clear the 1 spark plug that was a problem. You could definitely make a nice torque engine with them. That’s what I did with a Ford Motorsport A332 cam in a 351w. But if your going roller you will use a different cam probably.
@@nickgarrick9928 everyone said convert it to hydraulic roller, they said it preforms better easy hp gain and it last longer. I intended to keep it a flat tappet with a mild cam to save cost.
So you said a 96 explore gt40 head, if I kept stock rod piston specs would I be able to go up any in the rocker ratio to let it breath any or would you just recommend something like this spring kit and leave the rest as is? Sorry I have so many questions, most the time when I comment I don't tend to get any replys like this haha so I'm trying to learn all I can
@@williammontano7854 yes for the cost it will be to convert it for a low end midrange HP/TQ engine the gain will be minimal. If you were building a motor for a mustang that revs and makes power up high, for a on a track or 1/4 mile. It would be worth it. But for a truck your right to stick with the flat tappet. Man I like the 80-86 trucks. They are nice.
@@nickgarrick9928 okay that's fair enough, so then I can stick with my plan that saves me a pretty penny haha. They a great truck, look like they mean business but can clean up real nice and just built strong as hell
I never knew of these. I always reach for the Trick Flow kit as well. Never tried Alex Parts.
Thank you for including the part numbers. I f*ck around with these heads (non-P) quite a bit. Might give this setup a go on the next round.
Cheers.
Welcome
I’m like you like to do stuff on a budget. Having the part numbers just makes it easier for ever to find them. Trick flow and Alex’s didn’t have stock when I was looking. Glad you found the video handy.
Looking at getting the same kit from Lunati. I have GT40 and GT40P head sets also from Pick n Pull in Calgary. Both sets in very good condition from Explorers. Perfect for my 351W HO.
Trick Flow has a similar kit but they are out of stock. Best price is directly from Lunati's web site.
Hey Shane
Sweet score on the GT40s and the Ps. Just check the bolt hole size on the Ps, I’ve heard some are 1/2 holes like your 351W and some were 7/16 holes. Might have to drill them out. The GT40s are nice because no header/spark plug interference.
Can you use stud mount rocker arms with the roller with this? 1.6 ratio
Hi Jake
I don’t see why not. It’s going to be the same valve and spring combo so should be fine. Your pushrods might need to be a different length depending on the rocker, lifter combo.
@@nickgarrick9928 thanks for quick response, I’m trying to run a cam that goes up .565 lift so I’m worried that would be cutting it too close and pushing it with the springs that come in the kit. I have some gt40p heads as I was going for a budget build on my 302. only other route I’ve seen is getting new valves with taller height keeper grooves for the exhaust so that they all line up even, and machining the lower guides to a smaller diameter to fit dual springs. But at that point with all the machining I prob might as well get some aftermarket heads. Really just seeing if this was a option that would hold up, maybe could get away with diff length pushrods and just milling the bolt pads to fit 3/8 in studs
I just hate that they have to have diff height exhaust and intake it’s a weird geometry
Ya I have no idea why they are different heights, they should have made them the same. Yes your right after doing all the work, it’s probably worth it to get a set of aluminum heads. I sure thought of it. My next build I will. Probably AFR heads. Also running big lift check the piston clearance, it’s going to be close.
@@nickgarrick9928 yeah I have some Mahle pistons with pretty big valve releif, but still questioning the .570 lift claim on this kit. If it don’t work just gonna bite the bullet and get the afrs
Are these ok for the stock cam? On a 95 gt
With 1.7 rr . Because I know my lift will be in the .470s but these springs are rated .575
very big question hopefully you can answer. can i run a flat tappet cam with these springs?
or do i have to switch to roller lifters?
Yes you can run flat tappet lifters. Just stay less than the max lift with your camshaft and check piston to valve clearance. I have my heads on my 1973 302 block now. Which is flat tappet and the 351w I will be putting them on later after I drill the holes out to 1/2 to mount them is flat tappet as well. When you install these heads before putting it back together check your pushrod length. Make sure they aren’t short or to long.
@@nickgarrick9928 Another question will it make more sense to break in my cam with these spring or switch back to the stock ones
@@rockne3971 to break in your cam run these springs in the kit. No need to change them out. Once they are done they are good to go. Also the stock springs probably won’t be good for and type of performance camshaft. They were ok for the stock camshaft and that’s about it.
@@nickgarrick9928 Do you have any information with headers that will work with a manual 74 ford. I need some help with that too...
@@rockne3971 depends what vehicle your putting it in ? Also which year GT40 heads you have. Some are angled plugs some are straight.
Do you still use the original exhaust valves? And where did you order this kit I also live in Canada
Hi Martin
I ordered the kit from lunati off the website I used the stock intake and exhaust valves. You just need to change the keepers and springs. Everything is included in the kit. The part number is 73926K1
What is the most aggressive cam you can run with these springs? Im thinking of anderson n41
On the lunati site it says max lift you can run is .570. Your cam from what I can see is similar to one I run now with .512 lift so you should be good. But always Check the piston to valve clearance. And also check the springs for bind as well to be safe.
Did you run the factory rocker arms?
Yes I did run the stock Rocker arms
@@jliving7328 you can run rollers. I just ran factory 1.6 stamped non roller rockers.