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Old 02-06-2011, 06:27 PM   #1
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Cam and pushrod prob.

Hi, I replaced my cam, lifters and pushrods in my 302 and the new pushrods are shorter then my old ones and the rockers have play in them. How can I fix this problem. The old pushrods put pressure on the springs any advice would be great thanks.
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Old 02-06-2011, 09:58 PM   #2
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Re: Cam and pushrod prob.

Did you have it measured to see what length you needed?

I'd recommend having someone who knows how to measure for the right rods take a look at it for you. It definitely won't run with the longer rods.
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Old 02-06-2011, 10:23 PM   #3
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Re: Cam and pushrod prob.

im wondering if the lifters are shorter? check the length of the old lifters over the new, most likely that is your difference. if u try to use the old lifters and pushrods, u may change the valve lift when it is in opersation. when i changed rocker arms i had the same problem. i ended up having to use "+.117 over stock" pushrods. they have pushrod length checkers they sell in a set at jegs and summit. it basicly a set of blank pushrods, you keep goin one size up till u find the one u need, and that's how u figure the correct length you need. i used a screw driver and wedged it in over the stock push rod and under the rocker arm to calculate/measure the length i needed. whichever works...
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Old 02-06-2011, 11:06 PM   #4
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The lifters are the same size but the pushrods are shorter. Can you awnser me one thing, when using the proper pushrods and the valve closed will the rocker compress the valve spring a bit when you tighten the rocker bolt?
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Old 02-07-2011, 01:15 AM   #5
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Re: Cam and pushrod prob.

You could buy a set of adjustable rockers 1.6 or 1.7 roller and adjust them so you have no play.
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Old 02-07-2011, 11:01 AM   #6
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Re: Cam and pushrod prob.

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Originally Posted by Dexter View Post
The lifters are the same size but the pushrods are shorter. Can you awnser me one thing, when using the proper pushrods and the valve closed will the rocker compress the valve spring a bit when you tighten the rocker bolt?
it may a tiny bit, but shouldnt do it much if the valve is closed. my next question is this? do you have pedestal stock type rocker arms or stud mounted? honestly you need to contact the company you bought it from if it's a set. have you tried putting your stock pushrods back in?

if you installed your old pushrods and they seem to fit snug.... i would advise you to clay pistons tops re-assemble it. roll it over a few times(by hand) and double check that you dont have any piston to valve issues before operating the engine with those pushrods.

im really curious if your using pedestal or stud mount though
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Old 02-07-2011, 11:27 AM   #7
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Re: Cam and pushrod prob.

you have the wrong P-rods ,take then back and get the right ones , easy enough
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Old 02-07-2011, 10:20 PM   #8
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Quote:
Originally Posted by stampde
you have the wrong P-rods ,take then back and get the right ones , easy enough
+1 and adjustable roller rockers would be a good idea too.

What kind of heads are you using?
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Old 02-07-2011, 10:30 PM   #9
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I'm using stock heads with stud mount non adjustable rockers, the guy I bought them from was using adj rockers I didn't know that until this morning. So I gonna have to get adj rockers but the conversion is not worth it to do with all the machine work and parts buying, I might as well invest in some aftermarket heads. Thanks to all you guy for helping me, that's why I come here.
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Old 02-07-2011, 10:55 PM   #10
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Re: Cam and pushrod prob.

and thats y i asked if you had pedestal or stud mount. you could prolly pic up a set of 1.6 or 1.7 pedestal mount for a 150-200 bucks. i been using a cheap set of 1.7 proforms for several years now i bought off of ebay. depending on the brand of rocker you get, you can still run into the pushrod length issue. its just kinda par for the course so to speak, even with pedestal
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racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 02-07-2011, 11:52 PM   #11
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A lot of people run the ford alphabet cams so they can use the stock prods and rockers. When I put the e cam in my wifes car everything fit perfectly.
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Old 02-08-2011, 12:11 AM   #12
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Quote:
Originally Posted by Cobracoupe5
A lot of people run the ford alphabet cams so they can use the stock prods and rockers. When I put the e cam in my wifes car everything fit perfectly.
When you say everything fit you mean stock pushrods and rockers?
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Old 02-08-2011, 12:21 AM   #13
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Re: Cam and pushrod prob.

you dont have to get an alphabet cam for you to use stock pushrods and rockers. just do sum research before you buy...but fuk it, all else fails, get an alphabet. i run an e-cam..but i use 1.7 rockers.
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racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 02-08-2011, 12:34 AM   #14
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Quote:
Originally Posted by Dexter

When you say everything fit you mean stock pushrods and rockers?
I used the stock push rods and rockers with no problems about 100k miles ago. She has about 250k on her 90 coupe now with no problems. You can use other cams as long as they have the same base circle as the stock and alphabet cams.
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Old 02-08-2011, 09:48 AM   #15
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Thanks again you guys, it turns out that stock length pushrods work cus the base circle is the same. You guys are pretty smart
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Old 02-08-2011, 08:25 PM   #16
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Your welcome!
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Old 02-08-2011, 11:09 PM   #17
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Re: Cam and pushrod prob.

Quote:
Originally Posted by Dexter View Post
The lifters are the same size but the pushrods are shorter. Can you awnser me one thing, when using the proper pushrods and the valve closed will the rocker compress the valve spring a bit when you tighten the rocker bolt?
just to reiterate, no, at the base of the cam you should see no spring compression at all, that is of coarse BEFORE you do the 1/4"-3/4" preload turn.

getting adjustable rockers won't fix the problem with the pushrods, I suggest you get an adjustable pushrod checker and convert one of your lifters to solid to do a length test.
here is the procedure on a dart head, it is the same for SBF


once you get the right measurement order a custom set of that length.
as far as the pedestal mount rockers, ford makes shim kits for this perpose to raise the rockers, and I have been known to grind the pads down to get them right as well, the video doesn't say to but getting a thin marker line is the most important, being slightly off to one side or the other is OK so long as the wear line isn't WIDE.

people leave alot of power and engine longevity on the table because they generally don't bother to get this right. I have seen a set of heads get ruined in 5-10K miles because the geometry was set up so bad.
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Old 02-09-2011, 11:09 PM   #18
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Quote:
Originally Posted by svtlx
im wondering if the lifters are shorter? check the length of the old lifters over the new, most likely that is your difference. if u try to use the old lifters and pushrods, u may change the valve lift when it is in opersation. when i changed rocker arms i had the same problem. i ended up having to use "+.117 over stock" pushrods. they have pushrod length checkers they sell in a set at jegs and summit. it basicly a set of blank pushrods, you keep goin one size up till u find the one u need, and that's how u figure the correct length you need. i used a screw driver and wedged it in over the stock push rod and under the rocker arm to calculate/measure the length i needed. whichever works...
Now that is some backyard ingenuity. Nice idea
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Old 02-09-2011, 11:13 PM   #19
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Re: Cam and pushrod prob.

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Now that is some backyard ingenuity. Nice idea
cheaper than the pushrod length checker set at jeg's...ive got tons of screw drivers...lol.
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racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 02-09-2011, 11:51 PM   #20
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What cam are you running? You may just need stock length prods but I would at least get a set of hardened ones.
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Old 02-09-2011, 11:57 PM   #21
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Re: Cam and pushrod prob.

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Originally Posted by Alscobra View Post
What cam are you running? You may just need stock length prods but I would at least get a set of hardened ones.
he figured out his problem a couple days ago...we're just running this thread into the ground...lol.
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bbk ssi, 70ml t.b., bbk adj.reg., bd11-a 11psi, e-cam,
racing aod, 2700 stall, 3.42 gears, ported e7, 308ci, 1.7rr, comp .560valve springs, gear drive, high dwell module, msd 6a & coil, bbk off road xpipe, mac cat back, 30lbs inj, pro-m 90mm, welded subframe connectors, boxed upper & lower trailing arms, spherical axle bushings, 255/50/16 tires, 255lph pump, 456hp
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Old 02-10-2011, 12:13 AM   #22
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Run it down.
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