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Old 09-23-2012, 06:36 PM
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1980 gmc 292 l25 power

well trying to get more power out of it .
header on the way
?can i get roller rockers for it to get hp ?
may be cam down the line to use tow vehicle but would like to keep lower rpm 3000 down would be awesome rough idle to ..would be going in a 1ton truck that manual 4 speed . and if possible keep original valve train
thanks lot
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Old 09-23-2012, 06:44 PM
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pull the head and port it when the header comes.Yes you can buy a cam for it.put good exhaust on the truck also.
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Old 09-23-2012, 06:49 PM
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can u put the cam in it with taking head off ?
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Old 09-23-2012, 06:54 PM
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can u put the cam in it with head on
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Old 09-23-2012, 07:00 PM
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you do not have to take off the head.its easier to change valve springs with the head off.A quick clean up of the exhaust ports would be nice.Change valve seals,check guides etc,whats the mileage on the engine?
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Old 09-23-2012, 07:00 PM
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Yes! You might look into this book too!
By 6 banger guru Leo Santucci. THis is his latest one.
Chevrolet Inline Six-Cylinder Power Manual 2nd Edition: Leo Santucci: 9781931128278: Amazon.com: Books Chevrolet Inline Six-Cylinder Power Manual 2nd Edition: Leo Santucci: 9781931128278: Amazon.com: Books
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Old 09-23-2012, 07:04 PM
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like 80,000 would no about the rockers? thanks
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Old 09-23-2012, 07:08 PM
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l'd like to keep the same valves and valve springs. Would you happen to recommend a cam that would work that's not too pricey? And operate in only the rpm's in the range (3000 and lower) l wanna do. Thanks
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Old 09-23-2012, 07:19 PM
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80k time for springs?yes you can get roller rockers though I doubt its worth the money,especially with old springs
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Old 09-23-2012, 07:26 PM
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would you know of a link
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Old 09-23-2012, 08:17 PM
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crane cams sells all valve train parts if that question is aimed at me
http://www.cranecams.com/314-319.pdf
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Old 09-23-2012, 09:59 PM
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Would you know what kind of hp l would get out of it by putting in roller rockers? Thanks
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Old 09-24-2012, 05:54 AM
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.5- 5hp on the high end if all your doing is roller rockers. There not going to help HP much of anything.

292 was never designed for HP. It is a low RPM truck engine, and coupled with the 4spd, will do anything you need. You can cam it and get the HP really good but going with too wild of a cam will eliminate the low end torque that the truck will need. 292's can and have been cranked to 600 HP with turbo/ Forced induction, but those engines will not be good in a truck.. 292 came in 1 tons for at least a few years. I worked on 1. 1980 with 292/4spd. It was a factory chassis cab and the old guy bought it new. He was an electrician but had since retired and just used the truck as personal transportation. He had a Reading truck box on it.

Last edited by matt167; 09-24-2012 at 06:00 AM.
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