LS3 forged drop in piston ?
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Teching In
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LS3 forged drop in piston ? Is it any forged drop in Pistons for ls3 with higher compression then stock..? Reason for this is that I want add compression without needing to rebalance rotating assembly
Wrong approach in my opinion. Balancing an assembly is power. Harmonics fight power, and balancing the assembly will do nothing but help you make power, for around $250. So…if it’s compression your after, why not just cut the heads and look at a .040 headgasket? What compression numbers are you aiming for?
Banned
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They make flat tops and domes ....
you just need a good site that lists the top piston manufacturers...
google this Site they have pretty much anything and everything for the LS
LSXceleration, LLC
Texas Speed and Performance Also...
you just need a good site that lists the top piston manufacturers...
google this Site they have pretty much anything and everything for the LS
LSXceleration, LLC
Texas Speed and Performance Also...
Launching!
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From: IL, USA
Yep I've been waiting 3 weeks for my pistons now, 3 more to go lol. Who ever thought a day would come we would be scavenging for parts like this when about 2 years ago you had a 101 options all in stock lol :/
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We add 2cc's of dome volume to our LS3 pistons to get a bit more compression out of it...11:1 with 70cc and .040 piston to head. That goes up to 11.6 with 66cc chambers and even a bit more yet if you tighten to .036 quench. It's the SUM-3269434065-2
Thread Starter
Teching In
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We add 2cc's of dome volume to our LS3 pistons to get a bit more compression out of it...11:1 with 70cc and .040 piston to head. That goes up to 11.6 with 66cc chambers and even a bit more yet if you tighten to .036 quench. It's the SUM-3269434065-2
is the piston/pin weight in same range as stock..?
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Teching In
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those forged piston you refer to which is off the shelf is approx 100 gram lighter then stock ls3 pistons
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Teching In
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Wrong approach in my opinion. Balancing an assembly is power. Harmonics fight power, and balancing the assembly will do nothing but help you make power, for around $250. So…if it’s compression your after, why not just cut the heads and look at a .040 headgasket? What compression numbers are you aiming for?
I’m heading for 12 or higher ratio, and I already milled head ,030 and using .040 gasket
i want 12 or higher as I will run e85
hi, sort of agree with you if I been living in us, but I’m in Sweden where a balancing cost me 650$… and im on limiter budged, else i bought a complete balanced stroker assembly..
I’m heading for 12 or higher ratio, and I already milled head ,030 and using .040 gasket
i want 12 or higher as I will run e85
I’m heading for 12 or higher ratio, and I already milled head ,030 and using .040 gasket
i want 12 or higher as I will run e85
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Last edited by 415LS; Aug 14, 2021 at 11:55 AM.
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We developed our 6.2L liter Pro LS pistons with a net 2cc dome to build a bit more compression. SUM-3269434065-2 would be the standard bore Gen. 4 rod version and SUM-299927406522 would be the standard bore aftermarket 6.125 rod version. The Gen 4 rod version weights 537 grams average and the pin is 124 grams average. The shorter 6.125 version will come in roughtly 425 grams with a 105 gram pin. Running a .040 gasket will help. Our compression ratios are figured with .045 piston to head net clearance. If you are ALWAYS going to run E-85, Wiseco has a K447X7 12cc domed piston designed for aftermarket 6.125 rod which is .005 over and the height is about the same as ours (.004 in the hole at 9.240)
Last edited by Summitracing; Aug 16, 2021 at 11:16 AM.
On The Tree
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We add 2cc's of dome volume to our LS3 pistons to get a bit more compression out of it...11:1 with 70cc and .040 piston to head. That goes up to 11.6 with 66cc chambers and even a bit more yet if you tighten to .036 quench. It's the SUM-3269434065-2
Thanks
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Hi, seeing if you could help with a ballpark answer. On the stock ls3 piston if you mill the heads and thinner gasket you run into ptv issues. With your .2cc ls3 stock rod piston, is there ample amount of ptv room? Say you mill the heads to 66cc and thinner gasket, could you run say a 236 240 112 or something in that area.
Thanks
Thanks
There should be ample PTV clearance with our -2cc dome pistons for the stock rod LS3 and your combo. Our Pro LS pistons sit .005" in the hole with the stock deck height of 9.240". They are designed for large solid roller cams and rarely require flycutting. Our recommendation for minimum piston-to-valve clearance is .060" intake and .090" exhaust. The thickness under the pocket is very thick and allows for a good amount of flycutting if necessary. The minimum intake pocket to top ring groove distance of .080" allows the intake relief to be .270" (.070" deeper) and the exhaust depth to be .270" (.120" deeper). Don't go further than necessary to maintain maximum strength.
We did a PTV test on a stock LS3 a while back. That's completely stock heads, deck height, pistons/rods, etc. Just changing out the camshafts with our Pro LS cams. When we tested on a stock LS3, the valve drop on that head was .128" on the intake. Our SUM-8710R1 Stage 3 LS3 version cam had .081"/.103" clearance. The stage 4 SUM-8711R1 had .076"/.096". We tested the standard stage 4 SUM-8709R1 as well which had .061"/.092". Remember this is with stock 0cc true LS3 flat tops with no valve reliefs. Things open up with our 6.0/6.2 pistons above designed with valve reliefs for cathedral and rectangle port heads.