cam swap, hit a snag
07-29-2009, 12:37 AM
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cam swap, hit a snag so one of the three 10mm air pump nuts will not come off(the ones with the rubber behind it) it turns but will not go anywhere.. any one got any ideas? I think I'll call it a night for now, maybe I'll think of somin in the morning.
07-29-2009, 01:22 AM
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while I've got this thread goin, do cc918's require and modifications to work? their on my spare set of heads I have to (eventually) get ported out, but they were on em when I got em and they need to come off and go on the ones on the engine so.. tia!
Last edited by z_speedfreak; 07-29-2009 at 01:48 AM.
07-29-2009, 01:41 AM
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07-29-2009, 02:02 AM
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As stated you'll be fine.
07-29-2009, 07:58 AM
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Technically yes. The spring pockets need to be machined down some to get a desirable 1.8" spring installed height. You can install them as is with the correct retainers and locks. I think the installed height will be around 1.7" which is on the high side of spring pressure. I think you will be good with a lift under .570". I'm no expert though.
. these other heads of mine have 2.02/1.56 valves tho so I might loose a couple hp to valve shrouding on stock heads, but I could also install the impala HG's I have. hmm what to do..
07-29-2009, 08:12 AM
#7
hahah yeah I was thinking about ditching it actually, but I would need to get some egr block off plates correct? if I ditch it I want to keep all the egr fittings and just plug everything up to make it look like its all still there in case I ever get pulled over and checked out by a cop who actually knows what hes talking about.
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07-29-2009, 08:40 AM
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I'm hoping shbox, 96capricemanager or gizmo pokes their head in here soon
I swear those guys know everything LTx related!
07-29-2009, 09:33 AM
#11
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Whatever springs you decide, just make sure they are installed at the correct height. In order to do this you will need shims and a spring micrometer. Either that or have a machine shop do it (however you would want to check their work anyway so you may as well do it yourself).
Spring micrometer can be found here:
http://www.summitracing.com/parts/SUM-900032/
Also, I know the question has already been answered, but even if you don't have assy. lube you can also use straight 30w oil (NOT 10w-30).
Spring micrometer can be found here:
http://www.summitracing.com/parts/SUM-900032/
Also, I know the question has already been answered, but even if you don't have assy. lube you can also use straight 30w oil (NOT 10w-30).
07-29-2009, 10:36 AM
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Whatever springs you decide, just make sure they are installed at the correct height. In order to do this you will need shims and a spring micrometer. Either that or have a machine shop do it (however you would want to check their work anyway so you may as well do it yourself).
Spring micrometer can be found here:
http://www.summitracing.com/parts/SUM-900032/
Also, I know the question has already been answered, but even if you don't have assy. lube you can also use straight 30w oil (NOT 10w-30).
Spring micrometer can be found here:
http://www.summitracing.com/parts/SUM-900032/
Also, I know the question has already been answered, but even if you don't have assy. lube you can also use straight 30w oil (NOT 10w-30).
07-29-2009, 11:15 AM
#14
hahah yeah I was thinking about ditching it actually, but I would need to get some egr block off plates correct? if I ditch it I want to keep all the egr fittings and just plug everything up to make it look like its all still there in case I ever get pulled over and checked out by a cop who actually knows what hes talking about.
hmm.. well I'll be under .570" right now cause I'll still be using the stock 1.5 rockers for a little while but I don't want to install anything incorrectly... maybe I should just swap the heads..? I had them checked out by a machine shop and they said everything was ok and set up right so I imagine they checked the spring height too.. can you check the spring height with a tape measure or is a special tool required? im a newb when it comes to internal mechanics, this is my 1st venture into internals. these other heads of mine have 2.02/1.56 valves tho so I might loose a couple hp to valve shrouding on stock heads, but I could also install the impala HG's I have. hmm what to do..
hmm.. well I'll be under .570" right now cause I'll still be using the stock 1.5 rockers for a little while but I don't want to install anything incorrectly... maybe I should just swap the heads..? I had them checked out by a machine shop and they said everything was ok and set up right so I imagine they checked the spring height too.. can you check the spring height with a tape measure or is a special tool required? im a newb when it comes to internal mechanics, this is my 1st venture into internals
. these other heads of mine have 2.02/1.56 valves tho so I might loose a couple hp to valve shrouding on stock heads, but I could also install the impala HG's I have. hmm what to do..Whatever springs you decide, just make sure they are installed at the correct height. In order to do this you will need shims and a spring micrometer. Either that or have a machine shop do it (however you would want to check their work anyway so you may as well do it yourself).
Spring micrometer can be found here:
http://www.summitracing.com/parts/SUM-900032/
Also, I know the question has already been answered, but even if you don't have assy. lube you can also use straight 30w oil (NOT 10w-30).
Spring micrometer can be found here:
http://www.summitracing.com/parts/SUM-900032/
Also, I know the question has already been answered, but even if you don't have assy. lube you can also use straight 30w oil (NOT 10w-30).
cool, thanks! I'm def using the 918's since I've got them. I've been reading around and saw that allot of people use the +.050 locks instead of having their heads machined. any cons to doing this? should I get a set of +.050 locks or should I swap the other heads that as far as I know have the proper 1.8 height but also have larger valves? if I did that and used the impala HG's would that change the length of the PR required? tia
07-29-2009, 12:38 PM
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The only drawback to using those retainers would be clearance issues with SA rocker arms (the ones with the tabs) so when you do buy rockers just make sure they'll work or buy NSA.
07-29-2009, 08:15 PM
#16
i ended up about 1.75 with my old 918 setup with the +.05 locks. no sa rockers will not work, and .580 is about all the lift you'd wanna run. definitely check every single spring (pain in the ***) but the numbers will be all over the place. on my afrs the installed height varied as much as .02 across the board with the same shims, hell there was even a .005+ variance in the comp shims too.
07-30-2009, 12:25 AM
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Never assume anything, get a spring micrometer and check the spring installed height yourself.
I believe the part number floating around for those +.050" locks are 10* locks. You need to be sure that you have matching retainers that will work with those locks. I'd call up Comp and ask them a few questions.
I believe the part number floating around for those +.050" locks are 10* locks. You need to be sure that you have matching retainers that will work with those locks. I'd call up Comp and ask them a few questions.
i ended up about 1.75 with my old 918 setup with the +.05 locks. no sa rockers will not work, and .580 is about all the lift you'd wanna run. definitely check every single spring (pain in the ***) but the numbers will be all over the place. on my afrs the installed height varied as much as .02 across the board with the same shims, hell there was even a .005+ variance in the comp shims too.
07-30-2009, 09:10 AM
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Stockers are SA, but do not have the large alignment tabs that most of the aftermarket SA rockers do that would cause clearance issues.
For the springs lift capacity, that is determined by the installed height - the coil bind of the springs. Normally leave .05" for safety and that is the max you should run.
For the springs lift capacity, that is determined by the installed height - the coil bind of the springs. Normally leave .05" for safety and that is the max you should run.
07-30-2009, 10:04 AM
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Stockers are SA, but do not have the large alignment tabs that most of the aftermarket SA rockers do that would cause clearance issues.
For the springs lift capacity, that is determined by the installed height - the coil bind of the springs. Normally leave .05" for safety and that is the max you should run.
For the springs lift capacity, that is determined by the installed height - the coil bind of the springs. Normally leave .05" for safety and that is the max you should run.