hey its me again lol...but im full of questions tonite. ive got stock valve springs on a 87 5.0 motors rite. im wantin to go to the ford racing f303 cam because my buddy has one that has about 2 or 3 pases down the track on it cam is stilll like new and he only wants a hundred bucks for it.so that brings the questions...should i buy a used cam whats thwe downside to it ive known the guy forever and he wouldnt wanna dick me or nothin like that hes a honest guy and ivew looked at the cam and it looks like brand new on the lobes. ut with that cam its .512/.512 will the stock valve springs hold up to that much lift or what?whats yalls opinion on this situation?
5.12 cam and stock valve springs?
- Thread starter sicknotchback
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A used cam is fine, just check for any obvious damage where the lifter rides on the cam lobes.
That type of lift is pushing it for stock valve springs. Especially old valve springs...
The stock cam has .444" lift, so the jump from the F cam is really pushing it.
I would advise against using stock springs.
Good Luck!
That type of lift is pushing it for stock valve springs. Especially old valve springs...
The stock cam has .444" lift, so the jump from the F cam is really pushing it.
I would advise against using stock springs.
Good Luck!
1BADLXCOUPE
New Member
I would also Advice to use New Springs.
.500' lift is about the Maximum I would go, without changing the Valve Springs, because many people have told me its not necessary at that level. With .512' lift, like the F303 and its Suitable RPM Range, I would definitely swap in a Decent Set of Valvesprings (.550' lift) to stay away from Valve float and some wrecked Valve's in the Process. Just my oppinion. I didnt Switch mine out, but I went with alittle Milder Cam right under .500lift
So saved a Few Dollars in the long run.
.500' lift is about the Maximum I would go, without changing the Valve Springs, because many people have told me its not necessary at that level. With .512' lift, like the F303 and its Suitable RPM Range, I would definitely swap in a Decent Set of Valvesprings (.550' lift) to stay away from Valve float and some wrecked Valve's in the Process. Just my oppinion. I didnt Switch mine out, but I went with alittle Milder Cam right under .500lift
So saved a Few Dollars in the long run.
bill302
Active Member
i just installed a custom cam with .514 lift. it was recommended by crower who ground my cam to have at least 115 lb seat pressure and 290 open pressure.stock springs dont come close. it cost me $200 to have a machine shop machine off the boss under the stock springs to install double springs,reatiners and locks which i purchased from the machine shop and were included in the $200 price. i did buy $160 worth of springs, retainers and locks from jegs but after checking with the machine shop he told me he could machine what i needed and install the new springs keepers and locks for the $200 i returned what i purchased from jegs...i wish i called the machine shop first....you will need double springs and machining to do the job right...just get the recommended valve seat and open pressure from the cam manufacturer and get in touch with your machine shop they should be able to tell you the cheapest and best route possible...
PUNISHER RACING
Active Member
The used cam will be fine however you will need to change out those springs. I just put an X cam in and used Crane Springs part #44308-1 they are $116.00 in Summit and are a direct replacement. They work great and are good to .550 lift you can be into a new cam and springs for $250.00.....Sweet
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