[91mustang5.0j]

so here it is i bought this 91 5.o the guy i bought it from just put roller rockers on it i just found out the reason my car aint running right is because i need a roller cam, roller push rods an roller lifters so if any one has this hit me up asap or let me know were i can order some so i can get my 5.0 running tip top , also lookin for a set of afr heads perferbly 185 cc or 195 cc an holley high perfomance oil pump an last i need some high perfomance rotors calbers an brakes because my stang is all over the road thanks
also i have a complete 351 w rebuit with racings heads an cam holley 4 berrel carb just needs to be cleaned up a bit will trade for the parts i need

[thunderchicken]

Originally Posted by 91mustang5.0j

so here it is i bought this 91 5.o the guy i bought it from just put roller rockers on it i just found out the reason my car aint running right is because i need a roller cam, roller push rods an roller lifters so if any one has this hit me up asap or let me know were i can order some so i can get my 5.0 running tip top , also lookin for a set of afr heads perferbly 185 cc or 195 cc an holley high perfomance oil pump an last i need some high perfomance rotors calbers an brakes because my stang is all over the road thanks

What i have been told is that a roller cam won't fit a non-roller block...first thing i can suggest is found out what year block you have...

[91mustang5.0j]

ok thanks i will find that out 2morrow

[thunderchicken]

Originally Posted by 91mustang5.0j

ok thanks i will find that out 2morrow

The differences,are as i'm told,that roller cam journals,are larger than a the journals of a non-roller cam so a roller cam won't fit in a non-roller block,and the lifter bores on a roller block are longer to accomidate roller lifters than that of a non-roller block...correct me if i'm wrong,but thats what i've been told....so no problem man...good luck

[91mustang5.0j]

thanks bro will reply tomorow lettin you know what year block i have cause im running a car an i know the 91 original is efi it might be a 91 block an the guy just switched it over to carb so i will keep you posted check in tomorrow bro thanks

[2k4mk1]

Roller rockers have noyhing to do withthe cam.
A roller cam requires different lifters. If he put roller lifters in it on a non roller cam then you will have issues.
Roller rockers are nothing more than a roller bearing tip on the rocker arm.
At worst with them you may need to ck the pushrod length.

However a non roller b;ock can be modified to accept a roller cam you have to drill and tap the valley of the block to accept the spider that holds the roller rockers in the bores.

[Hitman84]

Originally Posted by 2k4mk1

Roller rockers have noyhing to do withthe cam.
A roller cam requires different lifters. If he put roller lifters in it on a non roller cam then you will have issues.
Roller rockers are nothing more than a roller bearing tip on the rocker arm.
At worst with them you may need to ck the pushrod length.

However a non roller b;ock can be modified to accept a roller cam you have to drill and tap the valley of the block to accept the spider that holds the roller rockers in the bores.

This is correct! If you run a flat tappet cam and lifters, it does NOT matter what year your block is. If your block has the two holes in the intake valley for the spider than your block is a roller block. You can run a flat tappet cam and lifter set in any 5.0 block but you must make sure that you have the correct push rod length for your roller rockers. Also are your rockers pedistal or stud mounted? Depending on which you have there are some adjustments there that need to be made and clearances that need to be checked.

[91mustang5.0j]

my rockers are stud mounted ! there the pro comp rockers the purple one"s

[91mustang5.0j]

also wat about an e cam would that be fine?

[thunderchicken]

Originally Posted by Hitman84

This is correct! If you run a flat tappet cam and lifters, it does NOT matter what year your block is. If your block has the two holes in the intake valley for the spider than your block is a roller block. You can run a flat tappet cam and lifter set in any 5.0 block but you must make sure that you have the correct push rod length for your roller rockers. Also are your rockers pedistal or stud mounted? Depending on which you have there are some adjustments there that need to be made and clearances that need to be checked.

The would cam journals would need to be the same size aswell...correct??

[thunderchicken]

Also the the lifts on a roller cam are a more agressive than a non-roller cam,because of the roller lifters...

[Hitman84]

if your block is a roller block then that would be fine with a set of roller lifters. if it does not have a roller lifter setup in it now, then it would be much cheaper to go with a flat tappet cam and lifter set. I bought the comp cams magnum 290 flat tappet cam, lifter, timing chain and gears, valve springs, keepers and retainers all in one kit for about $320. and my car lopes like a MOTHER!!! it sounds pretty good and it has an awesome power range from about 1500rpm to 6800rpm. I am running a 94/95 E7TE roller block with a carb.

[91mustang5.0j]

hittman where did you order this setup??? pm me the website an part numbers? also did you have to get new push rods or did you use the stock ones you had in it?

[Hitman84]

PM sent.

[Hitman84]

from what i am reading, the flat tappet push rod length is 6.9" and the roller tappet push rod length is 6.25". the ratio of the roller rocker arms is there to increase the amount of time the valve is open or to increase the travel distance of the valve opening depending on what the ratio of the roller rocker arm is. i believe that the factory ration is 1.5, so 1.6 would leave the valve open a little longer and 1.7 even longer and so on.

[91mustang5.0j]

just talked to the guy that built my engine today an it has a ford racing x cam an forged pistons an the block is a 92 ,302 so that would make it a roller block correct?

[Hitman84]

yes if it is 86 or newer it is a roller block, that x cam should be pretty good too.

[91mustang5.0j]

yes sir i just need to get some push rods an lifters an a victor jr intake an some new heads i will be doin just fine thanks for the inputs hittman they were much appreciated
kudos for you bro

[2k4mk1]

Originally Posted by thunderchicken

The would cam journals would need to be the same size aswell...correct??

The bore dia is the same regardless of roller or non roller cam. Journal Dia is the same

[Sonic Blue 85]

I would suggest you get some help from someone who knows ford engines very well. Stock ford windsor rockers are 1.6 racio. You can put flat tappet cams in roller cam blocks, as long as you use the lifters that go with the cam, then check the push rod length and get the correct length push rods. You can not put a factory roller cam in a non roller block, the lifter bores are taller on factory roller blocks. You can get a roller cam conversion that use cams with smaller base circles.