roller rockers?
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just another Rockwell looser
Joined: Feb 2003
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From: Cocoa, FL
roller rockers?
hi, i have been looking for some roller rockers that are maybe a 1.7 or 1.75 ratio instead of the stock 1.6. i havn't had any luck yet, all i have found is a set with the stock ratio, does anyone know of another engine that has the rockers as the 300's. or ones that can take its place. maybe a 5.0?
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Yes, do a search on this forum for rockers. There are some stock Chevy rockers that you can use that have the ration you are looking for. It comes up from time to time but I don't remember exactly which ones to use. But it's in here, just look around. It's the hot tip for cheap increase in breathing in a 240 300 Ford six.
Posting Guru
Joined: Sep 2004
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Originally Posted by quadzjr
hi, i have been looking for some roller rockers that are maybe a 1.7 or 1.75 ratio instead of the stock 1.6. i havn't had any luck yet, all i have found is a set with the stock ratio, does anyone know of another engine that has the rockers as the 300's. or ones that can take its place. maybe a 5.0?
Thread Starter
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just another Rockwell looser
Joined: Feb 2003
Posts: 4,042
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From: Cocoa, FL
crane gold series race rockers = low fiction, faster reving, and too dam expensive. Also they only come in stock ratio if they are for a ford straight six.
Would like to get a set of summit or jegs rockers. they will work just fine.. The chevy rockers are the exact bolt in fitment i need? Seeing that i am buying a new cam shaft. (Was thinking maybe the clifford camshaft from 2000 to 4500) Is there any point really to get the larger ratio rockers? I am already getting more lift with the cam. I did the math and with 1.7's and the cam i will get something like .503 lift.
side note. How come all other cam manufacturers have camshafts with lower lifts and higher durations and cliffords cams are high lift low duration? I am sure companies like competition cams, crane, crower all have done the research.
Would like to get a set of summit or jegs rockers. they will work just fine.. The chevy rockers are the exact bolt in fitment i need? Seeing that i am buying a new cam shaft. (Was thinking maybe the clifford camshaft from 2000 to 4500) Is there any point really to get the larger ratio rockers? I am already getting more lift with the cam. I did the math and with 1.7's and the cam i will get something like .503 lift.
side note. How come all other cam manufacturers have camshafts with lower lifts and higher durations and cliffords cams are high lift low duration? I am sure companies like competition cams, crane, crower all have done the research.
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
What year is your engine? The Chevy rockers don't fit the EFI engines without mods to the head. IMO, higher ratio rockers are just a crutch for picking the wrong cam and rollers are only worth the money in high rpm or high valvespring force applications. I put 1.73 rockers on my truck and got 5-6 hp at the point of peak gain and about 2-3 peak hp.
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Posting Guru
Joined: Sep 2004
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Good point.
FWIW, if you have a carb head the chevy rockers are a direct bolt in. I believe you can actually use 454 rockers too.
If you have an efi head, you can purchase a conversion kit from crane, makes it a bolt in deal, but then you have clearance issues with the valve cover and the conversion kit isn't free.
Silver streak
Would have been interesting to see your dyno results with the cam installed straight up with the higher ratio rockers.
FWIW, if you have a carb head the chevy rockers are a direct bolt in. I believe you can actually use 454 rockers too.
If you have an efi head, you can purchase a conversion kit from crane, makes it a bolt in deal, but then you have clearance issues with the valve cover and the conversion kit isn't free.
Silver streak
Would have been interesting to see your dyno results with the cam installed straight up with the higher ratio rockers.
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Thread Starter
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just another Rockwell looser
Joined: Feb 2003
Posts: 4,042
Likes: 0
From: Cocoa, FL
I'll just pick the right cam to begin with and find a cheaper set of roller rockers with stock ratio down the line.
does any body know the answer to my previous question about the direction of different cam manufacturers and clifford?
does any body know the answer to my previous question about the direction of different cam manufacturers and clifford?
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Originally Posted by quadzjr
I'll just pick the right cam to begin with and find a cheaper set of roller rockers with stock ratio down the line.
does any body know the answer to my previous question about the direction of different cam manufacturers and clifford?
does any body know the answer to my previous question about the direction of different cam manufacturers and clifford?
Last edited by Bdox; Dec 8, 2005 at 07:10 PM. Reason: sp
Thread Starter
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just another Rockwell looser
Joined: Feb 2003
Posts: 4,042
Likes: 0
From: Cocoa, FL
that is what i thought. I talked to the guy at competition cams. (Have small discount going through engine program at school) He said the same thing.
basically if you have a stick and don't mind manipulating the clutch to get it in the higher rpm range their cam would produce the most power and be the one for you..
If you have an auto with the stock converter or don't want to do the stuff mentioned above get something like cliffords
of corse he told me that I can choose any cam profile I want and make a custom cam to either match cliffords or creat my own somewhere in the middle. all it takes is money.
going with the clifford cam now.
basically if you have a stick and don't mind manipulating the clutch to get it in the higher rpm range their cam would produce the most power and be the one for you..
If you have an auto with the stock converter or don't want to do the stuff mentioned above get something like cliffords
of corse he told me that I can choose any cam profile I want and make a custom cam to either match cliffords or creat my own somewhere in the middle. all it takes is money.
going with the clifford cam now.
Thread Starter
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just another Rockwell looser
Joined: Feb 2003
Posts: 4,042
Likes: 0
From: Cocoa, FL
yeah with a 100 dollar higher price tag because of the "custom" grind. It would be nice to have a split duration, like comp cams extreme energy series, cam with a lower split duration 205/215 int/exh @ 50 and a lift close to cliffords .474.
It would be nice to have a split duration, like comp cams extreme energy series, cam with a lower split duration 205/215 int/exh @ 50 and a lift close to cliffords .474.