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Hi guys ,i`m newbie here and I just bought a L92 engine from 2007 escalade. I plan to open the engine and particly rebuild it ,main and rods bearings, camshaft bearings, oil pump, heads refreshes, double valve springs , ls3 intake manifold , vvt delete and etc. But i have a simple question for you i hope xexe . How big cams can i put in the heads without pistons cut? I know the L92 have a valve reliefs and more space between piston and valves. I`m planning to build a drift engine and i found stage 4 drift camshaft from Michigan Motorsports with the folowwing Specs: 234/248 .629"/.615" 112 LSA
Is it possible to put them into stock internals?
Not simple at all, since they don't disclose the amount of advance/retard ground in. In which case, no way to determine exact opening and closing events. And the lobe profiles and positions are often more important that the valve lift itself. Someone would have to be running your exact combination to give a part-way definitive answer. And even then, differences in tolerances of piston to deck height, head surface, camshaft tolerances, timing gear tolerances, and even compressed gasket can impact so it's still no guarentee (and of course always needs to be verified on the actual engine).
Maybe one suggestion would be looking at @Summitracing 's Stage 4 Extra Clearance SUM-8711R1. Very similar in specs (234/248 114+3.5). It still assumes unmilled heads (on an LS3). Attached is a dyno test with that actual camshaft on an L92 for reference. https://www.motortrend.com/how-to/l9...aft-dyno-test/
However if you're not milling the heads and using the stock pistons then their slightly smaller Stage 3 Extra Clearance SUM-8710R1 (230/242 113+3) would give a more safety margin and still spin up to 7k.
Thanks guys, I'll probably contact michigan spotorsports directly to get the info.
About Richard Holdener, I watched most of his videos on the l92 and ls3 camshafts, and learned a lot from him.
When cams come, i`ll give info about my choice and the resault.
@68Formula is spot on here about piston-to-valve clearance "PTV". Without the advanced/retarded number it's hard to say. He said it best with "the lobe profiles and positions are often more important than the valve lift itself".
We did some PTV testing a while back on a stock LS3 with a few of our cams. When we performed the test on the stock LS3, the valve drop on that head was .128" on the intake. When checking PTV clearance we recommend checking the intake 8* ATDC and the exhaust 8* BTDC. For PTV clearance we recommend a minimum of .060" on the intake and .090" on the exhaust.
- First up was our SUM-8710R1 Stage 3 "extra clearance" cam. Specs on it are .625/.605, 230/242, 113+3 with 10* of overlap. It had .081"/.103" PTV clearance. - Then we tested our stage 4 "extra clearance" SUM-8711R1. Specs on it are .625/.605, 234/248, 114+3.5 with 14* of overlap. It had .076"/.096" PTV clearance. - We figured why not test the standard stage 4 SUM-8709R1 as well. Specs on it are .625/.605, 238/246, 113+3 with 16* of overlap. It had .061"/.092" PTV clearance. That’s pretty much right at the PTV limit we would typically recommend. It works for rec port applications, but it’s a bit tight depending on tolerances so we don't list it as a "rec port/extra clearance" cam.
With that being said for your drift application we'd recommend our stage 4 "extra clearance" SUM-8711R1. It will have a rough idle with a very strong mid-range that will run out to 7,000+. Some numerically higher gears will be needed. Pair the 8711R1 with some .660" lift duals such as the Trickflow TFS-2500286P and they'll keep the valvetrain happy.
We know our customers like combos so we have some Pro LS cam combos to make cam swaps easier. We have cam and spring combos as well as cam, spring, and install/gasket kit combos. For all available 8711R1 combos check here.
Let us know if we can be of any further assistance. We'll be happy to help
@Summitracing This is exactly the kind of answer I expected...thank you very much. I saw that Richard Holdener used this exact camshaft in a stock L92 engine and got enviable results on the dyno and after your comment it will definitely be my choice.
We think you'll be very happy with your choice. If you need assistance with other parts for the build don't hesitate to reach out to us. We're only a post or PM away. Good luck with the project and at your drift events
We think you'll be very happy with your choice. If you need assistance with other parts for the build don't hesitate to reach out to us. We're only a post or PM away. Good luck with the project and at your drift events
Yes i have a list allready ,and will take advantage to Black Friday Have a question too...is this Pushrods (5/16 in. Diameter, 7.400 in. Length, 0.080 in. Wall Thickness) are good for my build. I`m sorry, but I don`t have rights to write you a private message and I`m forced to write a comment about everything.
Yes i have a list allready ,and will take advantage to Black Friday Have a question too...is this Pushrods (5/16 in. Diameter, 7.400 in. Length, 0.080 in. Wall Thickness) are good for my build. I`m sorry, but I don`t have rights to write you a private message and I`m forced to write a comment about everything.
That sounds like a good plan. As an FYI we have our Cyber Savings Month running through the end of the month. We're not sure of a specific rule for being able to PM on LS1Tech. There is likely a number of posts needed for a member to be able to send or receive PM's. Maybe one of the moderators such as @RPM WS6 or @Che70velle could chime in with that info.
Regarding pushrods. With the 8711R1 we typically see a 7.425" pushrod used. Things can vary so we always recommend measuring for pushrod length before purchasing pushrods. If you don't already have a pushrod length checker we offer the Trickflow TFS-9501. For pushrods, we recommend a minimum of a 5/16" Chromoly pushrod with a .080" wall. You can typically find a set of 16 for around $100. From there you can get into a thicker wall or larger diameter pushrod. For excellent stability and strength check out our 11/32" HDR pushrods with a .120" wall. These have 25% less stress and 28% less deflection than a typical 5/16" x .080" wall Chromoly pushrod. The 11/32" pushrods will fit stock or aftermarket heads.
That sounds like a good plan. As an FYI we have our Cyber Savings Month running through the end of the month. We're not sure of a specific rule for being able to PM on LS1Tech. There is likely a number of posts needed for a member to be able to send or receive PM's. Maybe one of the moderators such as @RPM WS6 or @Che70velle could chime in with that info.
Regarding pushrods. With the 8711R1 we typically see a 7.425" pushrod used. Things can vary so we always recommend measuring for pushrod length before purchasing pushrods. If you don't already have a pushrod length checker we offer the Trickflow TFS-9501. For pushrods, we recommend a minimum of a 5/16" Chromoly pushrod with a .080" wall. You can typically find a set of 16 for around $100. From there you can get into a thicker wall or larger diameter pushrod. For excellent stability and strength check out our 11/32" HDR pushrods with a .120" wall. These have 25% less stress and 28% less deflection than a typical 5/16" x .080" wall Chromoly pushrod. The 11/32" pushrods will fit stock or aftermarket heads.
Thank you again for your advice , what lifters would be the best for me to use ? I searching for any info about solid roller lifters in L92/LS3 but nothing.
@Jimbo1367 said it best. If you want to go with solid roller lifters look into the Cam Motion LLR solid roller cams. If you want to stick with a hydraulic roller cam such as our SUM-8711R1 we have the SUM-HT217-16 Morel 7717 drop-in lifters. We offer those in a combo with new trays as part number SUM-HTLSKIT3. Outside of what we have to offer a lot of folks like Johnson lifters. Keep in mind different lifters have different cup heights and recommended pre-load settings. This will affect pushrod length. It's important to check pushrod length before purchasing pushrods.
Thank you guys for your advices and help... for now im allready purchased from summitracing.com this list of parts, and whait them to arrive.It would be complicated for me to wait for the camshaft to arrive and after that made measuring, because i`m out of the states. I wil probably place a next order for camshaft, crankshaft, and rods bearings, ,head gaskets and melling oil pump, if i can`t find them in Europe.
1. Summit Racing™ Stage 4 Pro LS Cam, Extra Valve Clearance Version, 234/248 113 +3.5 .625/.605 Lift
2. Trick Flow® Double Platinum .660 LS Dual Valve Spring and Retainer Kits TFS-2500286P
3. Summit Racing™ HDR Thickwall Chromoly Pushrods SUM-14917425
4. Summit Racing™ LS Series Retrofit Trunnion Kits SUM-141560
5. Trick Flow® Variable Valve Timing Delete Combos TFS-30678505
6. Summit Racing™ LS Lifter and Guide Kits SUM-HTLSKIT2 - I hope i didn`t make the wrong choice with this ls7 lifters. I will measure pushrods when put the cam in and i hope they will work fine.
We understand the hurdles with ordering parts Internationally. That looks like a good list you put together there. You'll be good with the LS7 lifters. We recommend .050-.075" preload with our SUM-HT215-16 LS7 lifters that are included in the SUM-HTLSKIT2lifter and tray kit. As long as you can achieve that with the 7.425" HDR Thickwall pushrods then you'll be good to go.
Hi guys late update...the engine block is in the machine shop. I ordered a new set of Summit Pro LS piston and rings SUM-136SN9045075 . Main, rods and cam bearings , head gaskets, head bolts , Melling M295HV oil pump, all seals and etc.
Infortunately i ordered a wrong intake and exhaust valves... ( TFS-32600211 and TFS-32600212) my mistake this valves is only for a trickflow heads.
What lenght i need for my 823 heads ? My old ones are 4.91 inches but on the exhaust i have a bad harm on the tips, someone has grind them before , and i`m not shure its right lenght. GM Genuine valves have 2 different sizes and i`m lil confused.
These are available through Summit. You will have to get a valve job done and have the heads setup, for valve tips to all be same length. Choose a good shop. This is not a drop-in and go purchase.
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L92 max cam size without pistons cut? 
Have a question too...is this Pushrods (5/16 in. Diameter, 7.400 in. Length, 0.080 in. Wall Thickness) are good for my build. I`m sorry, but I don`t have rights to write you a private message and I`m forced to write a comment about everything.
