Used roller cam question
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From: Bristol TN.
Used roller cam question
Hey guys, I bought a used roller cam off ebay the other day for 20 bucks it should be here today actually. The reason I got it was because I have a roller ready 87 302 block and am planning on doing a build similar almost exactly like the 302 engine that CARCRAFT made 400 hp with stock cam only with different headers and hyper pistons instead of factory forged like they used but compression would be the same. I did not have a roller cam and I found that roller cams can be rerused so and people talked about buying used cams all the time wether it was the FR alphabet cams or whatever so I bought a used mustang cam like they used in the carcraft engine. But I just got a answer from a guy in another thread in a different forum that I shouldn't use a used cam because of wear and it will destroy the motor....I thought I could reuse on a roller cam thats why I bought it????? Can you guys help me with some info on used roller cams?
The specs on this cam are suppose to be 276/266 dur. 444/444 lift. With 1.7 rockers like I'll be using its like 472/472 lift
The specs on this cam are suppose to be 276/266 dur. 444/444 lift. With 1.7 rockers like I'll be using its like 472/472 lift
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From: Bristol TN.
Sweet that makes me feel better. Yeah I know with all the pulleys and everything it will be less and the shorty headers i'll be using will bring it down too. In the article they used 165 AFR's, 1.7 rockers, 625 speed demon carb with 70 main jets, weiand stealth intake, and 35 total timing and got 405hp at 6200 rpm and 380 tq at 4500 all this was with just the water pump run, no assesories. when they ran the same engine with stock stamped steel rockers on the exact same engine it made like 386hp. they run it like that just to see how the stock rockers would do. Plus I have read other articles about how mild 302 combos with a XE264HR cam and forged rods and pistons are making 396 hp and 378 tq.
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From: Bristol TN.
Ok I've got another ? for you guys. since this is a used cam lets say its got 100,000 miles on it (I don't know I'm waiting for email from seller to answer that). Would it have worn a little bit...Like for instance the stock 444/444 lift....would it have less like 442/442 lift after 100,000 miles.
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you would see a grove worn into the lobe I would think. the roller is not as wide as the lobe, a flat tappet lifter uses the entire lobe. Hard to tell if a flat tappet cam is worn a little but I would think a roller would be noticeable.. I might be wrong ... never seen a trashed roller before.
as long as the journals (sp) are in good shape I would think a roller would last a long long time..
Get the guy to mic the Journals if it's not to late............
as long as the journals (sp) are in good shape I would think a roller would last a long long time..
Get the guy to mic the Journals if it's not to late............
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From: Ottawa, Ontario
Originally Posted by reed1951
since this is a used cam lets say its got 100,000 miles on it . Would it have worn a little bit...Like for instance the stock 444/444 lift....would it have less like 442/442 lift.
You do realize you also need roller lifters, shorter pushrods, and a spider and dogbones to use this cam don't you?
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From: south louisiana
Originally Posted by HemiEater
you would see a grove worn into the lobe I would think. the roller is not as wide as the lobe, a flat tappet lifter uses the entire lobe. Hard to tell if a flat tappet cam is worn a little but I would think a roller would be noticeable.. I might be wrong ... never seen a trashed roller before.
as long as the journals (sp) are in good shape I would think a roller would last a long long time..
Get the guy to mic the Journals if it's not to late............
as long as the journals (sp) are in good shape I would think a roller would last a long long time..
Get the guy to mic the Journals if it's not to late............
Actually the flat tappets use one side of the lobes, this is how the lobe spins the lifters. The spin imparted reduces the lobe to lifter wear in the process. 
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From: Bristol TN.
Originally Posted by Conanski
No. The lifters used with these cams have a roller tip(this is actually why they are called roller cams), so there is no friction that would wear down the lobes like a flat tappet cam. Inspect the lobes and bearing surfaces for pits or any non-uniform defects, they should be smooth all over.
You do realize you also need roller lifters, shorter pushrods, and a spider and dogbones to use this cam don't you?
You do realize you also need roller lifters, shorter pushrods, and a spider and dogbones to use this cam don't you?
Oh yeah I know, but I can just get some hardend stock length ford racing pushrods for that year mustang for that year i beleive the length is 6.272 I beleive they are 40 bucks, some FR roller lifters for about 130 bucks, and some dog bones either off ebay or go all out and get a new FR Dog bone kit for 50 bucks.
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Originally Posted by baddad457
Actually the flat tappets use one side of the lobes, this is how the lobe spins the lifters. The spin imparted reduces the lobe to lifter wear in the process. well I have to disagree.... the contact between the lobe and lifter will travel on the lobe from one side to the other as it spins the lifter. The lobe on the cam is not flat to the lifter, the actual contact between the two is very little, thats how it spins it. If you look real close at a flat tappet cam the lobes are on an angle they are not straight with the cam....
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From: Bristol TN.
hey guys i didn't want to start another thread with this question so I'll try it here:
Is there a difference between using 1.7 pedasral mount rockers and 1.7 stud mount rockers as in push rod length. And do you recomend one or the other or is there even a difference in how they affect power. Im thinking it doesnt matter but enlighten me.
Is there a difference between using 1.7 pedasral mount rockers and 1.7 stud mount rockers as in push rod length. And do you recomend one or the other or is there even a difference in how they affect power. Im thinking it doesnt matter but enlighten me.
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From: Ottawa, Ontario
Originally Posted by reed1951
Is there a difference between using 1.7 pedasral mount rockers and 1.7 stud mount rockers as in push rod length. And do you recomend one or the other or is there even a difference in how they affect power.