1.6 rockers instead of cam !? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-13-2003, 06:51 PM
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Post 1.6 rockers instead of cam !?

Im set on buying a set of 180cc pro toplines for my 350. I was thinking on getting a XE268 cam to go with them but something else popped in my head. My current cam specs are .443/.465 280/290, I was thinking instead of a cam swap 1.6 roller rockers (assuming they give you the estimated .030 more lift) would put my lift numbers at about .473/495. That is about the lift of the intake on the XE268 and more lift on the exhaust. A head and rocker swap would odviously be easier than heads and cam but will it work out like I think? Think it will make a solid 400 hp?

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Old 05-13-2003, 09:16 PM
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Roller rockers help. But I do not think you notice a huge difference in the extra lift. Are you running a roller cam now?? If not, going to a roller cam and 1.6 rollers would be a noticable difference........
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Old 05-14-2003, 02:26 AM
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no its just a hydraulic, thanks for the advise.
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Old 05-14-2003, 11:40 AM
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to my understanding you are correct. dont know what the duration of the 268 are or how it would help you. as you know the lifters wont change duration specs. if all yer lookin for is more lift a lifter change will get you that oops i meant a rocker ratio change

[ May 15, 2003: Message edited by: bullheimer ]</p>
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Old 05-14-2003, 05:16 PM
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i see
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Old 10-30-2003, 11:13 AM
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I like your idea of using more rocker ratio instead of changing your cam , you will obviously increase your lift and I have read that it will actually increase your duration slightly. I would go for it
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Old 10-30-2003, 11:19 AM
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You can try the rockers, but personally, I'd stear way clear of the Pro Topline heads. We just yanked a new set off my sons engine, real trash. Castings were junk. Intake runner height varied 3/16" from one to the other, intake would not match up at the top if the runners, pushrods hit the head. We went to a set of World heads, lightyears difference between the 2 makers.
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Old 10-30-2003, 11:56 AM
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Apart from extra lift, are´nt roller rockers friction reducers and
make less heat.I put a set of Harlan Sharp in my old 305 years ago, now they´re in my 355.
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Old 10-30-2003, 06:17 PM
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Re: 1.6 rockers instead of cam !?

Quote:
Originally posted by john 85
Im set on buying a set of 180cc pro toplines for my 350. I was thinking on getting a XE268 cam to go with them but something else popped in my head. My current cam specs are .443/.465 280/290, I was thinking instead of a cam swap 1.6 roller rockers (assuming they give you the estimated .030 more lift) would put my lift numbers at about .473/495. That is about the lift of the intake on the XE268 and more lift on the exhaust. A head and rocker swap would odviously be easier than heads and cam but will it work out like I think? Think it will make a solid 400 hp?
If you want 400 hp you are going to need more cam than that. You will need over 230o duration and around .550" lift.
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Old 12-08-2003, 07:57 PM
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ive also heard the extra .030 lift in reality you will get about.016 extra lift still a good idea
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Old 12-08-2003, 08:20 PM
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Quote:
Originally posted by badknuckles
ive also heard the extra .030 lift in reality you will get about.016 extra lift still a good idea
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Old 12-09-2003, 12:30 AM
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I say buy the cam and the roller rockers.
even better... buy the cam one size up from the xe268 and get the, I believe they are called pump up lifters... or something like that. They will help reduce duration and lift during lower rpms but will "pump up" with oil during high rpm and really let that bigger cam do some work.
at least that is what I plan on doing to my truck's 350
todd
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Old 12-09-2003, 07:26 AM
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I agree with lluciano, you'll have to get well over 1/2" lift and 230+duration to get 400hp, the 1.6's won't get you there!
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Old 12-09-2003, 09:31 PM
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Quote:
Originally posted by badknuckles
ive also heard the extra .030 lift in reality you will get about.016 extra lift still a good idea
To get the actual new valve lift, take the current lift, divide by 1.5 ( the current ratio) and then multiply that by 1.6 . A .443/.465 cam becomes .473/.496 with 1.6 ratio rockers, so the numbers in the first post are correct.
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