LS7 Twin Turbo delima
Thread Starter
Teching In
Joined: Nov 2013
Posts: 32
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From: lake wales FL.
LS7 Twin Turbo delima Starting My new ls7 twin turbo build. Looking for some clarity. I started off wanting to build a 441ci(4.125 stroke-4.125 bore). So I bought a SHP LS next pro block from summit racing to handle the larger stroke. Now I'm looking for a rotating assembly. I Called a few reputable shops and told them I have a 4,000lb car with auto transmission and slightly over sized wheels. Weekend street car with a little track time. Looking for 1500hp on track tune and 1000hp for street tune on E85. Each shop has different advice. Ranging from definitely stroke, not to stroke and even destroke. Also compression ratios ranging for 9.0:1 to 11.5:1 now I'm lost. I want this to be a dependable engine. So All forged internals. Callies ls7 dragonslayer crank with 4.125 stroke, Wiseco Boostline 6.125 connecting rods. Wiseco -3cc pistons. Can any one put me on the right track.
I want a dependable engine,... not a ticking time bomb. I watched countless ls builds making 2000hp on youtube but how long do they last.
Also going with 70cc Dart heads
Holley or fast intake
76mm twin turbos
I want a dependable engine,... not a ticking time bomb. I watched countless ls builds making 2000hp on youtube but how long do they last.
Also going with 70cc Dart heads
Holley or fast intake
76mm twin turbos
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,235
Likes: 1,526
From: Ohio, Georgia, Nevada, Texas
Starting My new ls7 twin turbo build. Looking for some clarity. I started off wanting to build a 441ci(4.125 stroke-4.125 bore). So I bought a SHP LS next pro block from summit racing to handle the larger stroke. Now I'm looking for a rotating assembly. I Called a few reputable shops and told them I have a 4,000lb car with auto transmission and slightly over sized wheels. Weekend street car with a little track time. Looking for 1500hp on track tune and 1000hp for street tune on E85. Each shop has different advice. Ranging from definitely stroke, not to stroke and even destroke. Also compression ratios ranging for 9.0:1 to 11.5:1 now I'm lost. I want this to be a dependable engine. So All forged internals. Callies ls7 dragonslayer crank with 4.125 stroke, Wiseco Boostline 6.125 connecting rods. Wiseco -3cc pistons. Can any one put me on the right track.
I want a dependable engine,... not a ticking time bomb. I watched countless ls builds making 2000hp on youtube but how long do they last.
Also going with 70cc Dart heads
Holley or fast intake
76mm twin turbos
I want a dependable engine,... not a ticking time bomb. I watched countless ls builds making 2000hp on youtube but how long do they last.
Also going with 70cc Dart heads
Holley or fast intake
76mm twin turbos
A 427’s taller 1.110 compression height piston gives you thicker ring lands than a 1.050 tall piston. Great block. Go for TEA 6 bolt hipped Tfs 260’s preferably with Super Alloy Exhaust valves.
Last edited by Summitracing; Feb 4, 2020 at 09:53 PM.
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,235
Likes: 1,526
From: Ohio, Georgia, Nevada, Texas
If you go the 427 route, an 8cc piston would net 11:1 with a 70cc head and .045 net piston to head clearance. Wiseco's K395X125 piston hits that target on the nose. You will want to upgrade to their WIS-S718 .200 wall toolsteel pins.
There is no need to stroke it more than 4" ..... the LSNext block would've been a better choice; however the SHP will get the job done. Let the turbos do the work.... you don't need a ton of cubic inches to make 1500hp as you want to keep piston speed lower. The HIP'd TFS heads are primo..... you could also get it done with a STOCK LS3 head and more boost. If you have the budget get the better heads.
Thread Starter
Teching In
Joined: Nov 2013
Posts: 32
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From: lake wales FL.
Thanks guys for all the info. Ordered the billet dart crankshaft with 4 inch stroke, boostline rods, and wiseco -20cc pistons. Compression ratio should be around 10:1 with the proper heads. Now trying to figure out this dry sump, wet sump conversion. Also thought the SHP ls next pro block is made out of the same material as the ls next block but has skirts. One more thing what does TEA and HIP'd mean? And where do I get them?
Last edited by stankinlancoln; Feb 10, 2020 at 05:27 PM.
