Roller Rockers and factory valve covers????
#1
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Roller Rockers and factory valve covers????
Any one happen to know of a brand (if any) of roller rocker arms that will fit under the stock SBC valve covers?? I would really like to go to roller rockers on my project engine, but I really want to keep the stock valve covers. Thanks for any input!!
#3
Race Director
Two gaskets
there's a good possibility that if you double gasket a thick pair of Felpros you could get away with that setup....but you really dont need the aggravation as they are not worth the cost because for almost nothing gained from their use ... there not worth the trouble....and they can be trouble.....
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there's a good possibility that if you double gasket a thick pair of Felpros you could get away with that setup....but you really dont need the aggravation as they are not worth the cost because for almost nothing gained from their use ... there not worth the trouble....and they can be trouble.....
1.5's
Low valve covers.
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#8
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For whatever it is worth, corvette fever did an article years ago about switching rockers on an early C4 (an 85 or 86) from stcok stamped steel rockers to 1.5 roller tipped comp cams rockers, changing nothing else, and the HP gain was 20 HP. Just telling you waht the article said so please no flames. I also saw the same results in one of the Hot Rod magazines on a GM V6 (late 90's) with roller tipped rockers (no other change), not the real roller rockers, about 10 years ago with a 10-12HP gain. Is that realistic, I don't know but on the other hand, I doubt that you would see no gain!
#9
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St. Jude Donor '07
Just in case you end up needing a little more room, these 1/4 in thick spacers when used with standard 3/16 in valve cover gaskets will gain you 7/16 in total inside additional clearance and keep all stock components.
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The problem is often not the roller rockers themselves, but the height of the poly-lock adjusting nuts. Seen here, you can see how tall the complete rocker/nut assembly sticks up:
I wanted to use the stock valve covers, so I used a pair of Stef’s Valve Cover Spacers under the stock valve covers to get me plenty of space for the valvetrain:
Lars
I wanted to use the stock valve covers, so I used a pair of Stef’s Valve Cover Spacers under the stock valve covers to get me plenty of space for the valvetrain:
Lars
#12
Le Mans Master
I figured out how much thread I needed for the poly locks, then cut down the polylock nuts in a lathe. I also ground the set screws flat in a valve surfacing machine using the stem tip grinder, having flat ground lock nuts makes for a more secure poly lock. Doing this method, I gained about 3/8" of clearance and it allowed me to put them under a set of LT-1 valve covers (you might also notice that I machined the valve cover gasket mating surfaces flat in a mill so my gaskets no longer split and fail, this lost about 1/8" of heigth.) It's quite a bit of work if your paying someone for their time, but, in my case my time isn't worth anything
#13
Drifting
I figured out how much thread I needed for the poly locks, then cut down the polylock nuts in a lathe. I also ground the set screws flat in a valve surfacing machine using the stem tip grinder, having flat ground lock nuts makes for a more secure poly lock. Doing this method, I gained about 3/8" of clearance and it allowed me to put them under a set of LT-1 valve covers (you might also notice that I machined the valve cover gasket mating surfaces flat in a mill so my gaskets no longer split and fail, this lost about 1/8" of heigth.) It's quite a bit of work if your paying someone for their time, but, in my case my time isn't worth anything
For what it's worth I have Comps 1.5 rollers and I don't especially like them, they're noisy.
#14
Melting Slicks
crower makes a short style of their rocker arm adjusting nuts for extra clearance.
http://www.summitracing.com/parts/CRO-86051S-16/
http://www.summitracing.com/parts/CRO-86051S-16/