5.3 LM7 buildup
12-13-2010, 08:48 PM
#1
Melting Slicks
Thread Starter
5.3 LM7 buildup
I picked up a LM7 short block for $150.00 with 35k on the block. So Im starting a build and will shine some light on my next low budget C4 vette. Im building it for my truck and the motor that comes out that will go in a C4 project with the same mods and like power.
Im thinking of a cam in this area 214-218 or 218-218 on a 114 for all around performance. Im tring to keep it low cost so I have to decide if Im going to get some LS6 heads and have them worked and milled.
Im tring to find the right combo Ill probly get on the phone with some cam people tomorrow to help me decide. Maybe a custom grind.
Eitherway another LSx is brewing!!!
Im thinking of a cam in this area 214-218 or 218-218 on a 114 for all around performance. Im tring to keep it low cost so I have to decide if Im going to get some LS6 heads and have them worked and milled.
Im tring to find the right combo Ill probly get on the phone with some cam people tomorrow to help me decide. Maybe a custom grind.
Eitherway another LSx is brewing!!!
Last edited by fc_soldier; 12-13-2010 at 09:12 PM.
12-13-2010, 09:07 PM
#3
Drifting
That truck engine should do a lot better than the l98,My 5.3 runs great in my truck
B.T.W. the 5.3 is a 325 ci engine
B.T.W. the 5.3 is a 325 ci engine
Last edited by tblt44; 12-13-2010 at 09:10 PM.
12-13-2010, 09:09 PM
#4
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St. Jude Donor '05
That cam will run good in that motor, keep the truck intake too if you can.
12-13-2010, 09:10 PM
#5
Melting Slicks
Thread Starter
Yeah If this goes well Ill try to hunt the L33 block down which is the aluminum 5.3. Im going to sqeeze as much as I can out of it and pass emissions fine. Im hoping to land in the 400ish area with cam and heads. I might talk to Lloyd Elliot for some ideas and work.
12-13-2010, 09:12 PM
#6
Melting Slicks
Thread Starter
Its a nice little winter project.
12-13-2010, 09:15 PM
#7
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St. Jude Donor '05
Love to find a low mile 5.3 or 6.0 for my truck, been aching to port set of those heads/intake. Sounds like fun to me.
When funds get better...
Think it was HRM a few years ago did a buildup very similar. Ported stock heads, mild cam headers tune got around 450chp which sounded stout out of a little motor.
When funds get better...
Think it was HRM a few years ago did a buildup very similar. Ported stock heads, mild cam headers tune got around 450chp which sounded stout out of a little motor.
12-13-2010, 10:38 PM
#10
Melting Slicks
Thread Starter
12-13-2010, 10:39 PM
#11
Le Mans Master
12-14-2010, 08:23 AM
#12
Le Mans Master
I'd seen some dyno comparisons of the truck 6.0L intake vs the LS2 and a FAST 90/92 somewhere, maybe ls1forums? The truck intake didn't make that much more torque down low, nor did it drop off that much up top. So it wasn't a huge difference, though there was some difference.
I assume when you say you'll use the truck intake, you mean for the motor going in your truck. When you pull your current motor and drop it in a 'vette, you would swap that intake, no? The truck one is pretty tall.
I assume when you say you'll use the truck intake, you mean for the motor going in your truck. When you pull your current motor and drop it in a 'vette, you would swap that intake, no? The truck one is pretty tall.
12-14-2010, 09:36 AM
#13
Melting Slicks
Thread Starter
I'd seen some dyno comparisons of the truck 6.0L intake vs the LS2 and a FAST 90/92 somewhere, maybe ls1forums? The truck intake didn't make that much more torque down low, nor did it drop off that much up top. So it wasn't a huge difference, though there was some difference.
I assume when you say you'll use the truck intake, you mean for the motor going in your truck. When you pull your current motor and drop it in a 'vette, you would swap that intake, no? The truck one is pretty tall.
I assume when you say you'll use the truck intake, you mean for the motor going in your truck. When you pull your current motor and drop it in a 'vette, you would swap that intake, no? The truck one is pretty tall.
12-14-2010, 07:46 PM
#15
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St. Jude Donor '05
Running the larger intakes on the 5.3 will lose ya power. Nice to see for once that usually the first part of an engine most mod can be left in place for once. Those motors are awesome, they need so little to make good power.
Wheres my winning lotto ticket.
Wheres my winning lotto ticket.
12-14-2010, 07:55 PM
#17
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St. Jude Donor '05
It was a 400 too 
12-15-2010, 06:41 PM
#18
Melting Slicks
i am not 100% sure but i think there may be a valve issues with a LS6 head on a 5.3 cause of the small bore.. you might just be good with having the stock 5.3 heads ported.. i have seen people pretty happy with thunder racings 224 cam in a 5.3.
12-15-2010, 07:10 PM
#19
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St. Jude Donor '05
Isnt the bore the same just different stroke? Havent kept up on things in awhile.
12-15-2010, 09:05 PM
#20
Melting Slicks
The bore is smaller on a 5.3 then an ls1 but they share the same rods and crank dimensions. i think the 5.3 an 4.8 share the same bore but have different rods and crank.
