need to know if any company even makes a higher ratio roller rocker

[stang94X]

right now my stock cam with 1.72 rockers makes my valve lift .478, so my question is does any company make a roller rocker that is a 1.8 ratio, companies make em for BB chevys and LS1 motors but do any make em for a SB Windsor head, i would love to find a 1.8 ratio for my car cause it would give me a .5004 lift and that would be perfect for my setup

 

[Paul]

Get a bigger cam.

 

[stang94X]

if i wanted a bigger cam i would have done it the first time around

 

[Paul]

Well if you want more lift, get a bigger cam.

 

[stang94X]

i dont have the time nor money to replace a cam, to get a bigger cam i will have to buy a E303 cam or something that is .500 or smaller lift and then buy new lifters and buy new 1.6 rockers, if i get a bigger cam and keep the rockers i have i will have to get a custom grind cam and new lifters, and if by some wonderful chance that a company sells 1.8 rockers then thats all i need to buy and spend an hour and a half changing them out and have the same lift that i desire, i too usually will suggest to get a bigger cam in most cases but i cant put a aftermarket cam in my motor with the 1.72 rockers cause i cant go over .500 lift due to valve piston clearance and i dont have the money to buy a cam, lifter and rockers or a custom cam and lifters

 

[Mr. OAM]

For another .022" of lift for a split second do you know how much more your heads will flow? Have your heads had any work done to them?

For improved performance you might benefit better by getting a cam with longer duration. You have a roller cam and new lifters are not automatically required like with a flat tappet cam. Rollers don't have the same friction wear on their surface like with flat lifters. Just a thought.

Also check out the other cam manufacturers. FRPP is not the only maker of cams you can use.


Steve

 

[stang94X]

i have the gt40X heads and i know my heads flow pretty good, they have been opened up on the intake and exhaust, i forget the exact numbers on them but after they were ported i remember the flow test being numbers more than 260 intake and 180 exhaust, unlike the 1.90 intake valves that are in the edelbrock and afr heads, the gt40X heads come with 1.94 intake valves and thats one thing what screwed me in getting a aftermarket cam cause the main reason is cause i was a dumbass and got 1.72 rockers not thinking about valve piston clearance, i cant go over a .500 lift and as for the duration a higher ratio rocker changes it a little and if i can find 1.8's then it should be good enough for what i have, its not that i dont want to tear my motor back about its just that i dont have time cause i work so much and my car is a daily driver and the rockers i can just do em in like 2 hours and be driving my car the same night

 

[Mr. OAM]

1.8 ratio rockers, if you can find them, have more forces exerted on them because of the faster actuation of them. The higher ratio, besides providing more lift, also causes faster valve events and that speed and force is exerted on the rockers. You might lose some durability in the end. 1.8 rockers, if made for the smallblock Ford, are probably more suited to racing where they will not see daily driving and have a longer expected lifespan before being changed.

Duration will stay the same because when the valve opens and closes is based within the 360 degrees of the cam lobe. The cam will start opening the valves at the same time in relation to the crank no matter what ratio you use. Because of the greater speed of the events though your valves do open and close faster, and in "time" that means that your valves get higher off the seat quicker, providing more flow.

I put those heads on my wife's engine and they are great. I put her's on right out of the box though.

You are in a bit of a quandry with having got the higher ratio rockers to begin with. With this also being your daily driver that puts even more limits on what you can do.

If I were in this position I would bite the bullet and get a better cam and 1.6 rockers. There is a multitude of grinds available to enable you to find the combination you are looking for. Get the parts in and then plan for a Thanksgiving Day weekend project.

Good luck,

Steve

 

[stang94X]

yeah, i came to the conclusion that i'm going to have to get a different cam, i cant find one company that makes a 1.8 rocker, not even for a race only motor, i talked to my father and his friend knows a guy that does custom grinds and i'm going to be able to get one for nearly the same cost of just buying a pre-grind aftermarket one

 

[OnyxCobra]

How much are rockers? Steeda #19 cam is $200 and will give you .516 lift with your 1.72 rockers, which i really don't think would be a problem but then again I don't know anything about GT40X heads. I know I can handle up to roughly .530 lift with my heads and stock pistons. I think new rockers on a stock cam is really a waste of time, a lot more power comes from the cam's duration rather than the lift.

 

[stang94X]

What heads do you have? Rockers usually run around $200-$250 depending on brand and some brands are a little cheaper. I would like to get a new cam, I am thinking about getting a custom grind cam made, but im still looking for an out of the box cam that will work with my rockers, and i wouldnt under estimate the stock cam with new rockers, with my ported heads, ported intake and the other bolt on stuff, with the stock cam and 1.72 rockers my car dynoed at 285 rwhp and 310 rwtq and thats with an automatic, i dont know what the numbers on a dyno will be now cause that was with the stock 2.73 gears and now i have 4.10's and other minor stuff done, like plugs, plug wires, high volt coil, aluminum driveshaft, a short belt and 16* advanced timing, i think thats it, just little stuff. everything thats done to my car is in my sig and last tuesday i ran a 13.2 in the quarter and thats in a automatic convertable, with the stock cam and stock torque converter, that was at a shitty track too and it was around 70 degrees, i'm going to a different track tomarrow that is really good, it has a lower altitude and the weather is suppose to be a high of 60 degrees and damn near no humidity, so hopefully i can run a little better

 

[OnyxCobra]

I have AFR 165cc pedestal mount heads. That's pretty good dyno numbers but most of the power you're making is from your heads and intake, which are the largest bottlenecks on stock 5.0s. I cant believe THAT much came from adding larger rockers, but i know it's good for some HP. Take a look at the Steeda #19, there have been a few threads about it in the past few weeks.

 

[Mr. OAM]

My wife's engine is running .524" lift with 9.6:1 compression pistons (including block decking) with no valve problems with the X305 heads.


Steve

 

[stang94X]

My wife's engine is running .524" lift with 9.6:1 compression pistons (including block decking) with no valve problems with the X305 heads.


Steve

is it the stock bottom end, i have a completely stock bottom end and my heads are the 64cc compression chambers