402 LS2 10.5 Compression
#1
On The Tree
Thread Starter
402 LS2 10.5 Compression
I should have asked this question before I bought the engine but I wanted to get some opinions here...this is what i'm working with
-Texas Speed & Performance Custom Built Forged 402 CID
-Wiseco Forged Piston Set: 4.005' Bore, 4.000' Stroke, 6.125' Rod Length, -3cc Flat-Top, 1.110' CH, Wrist Pins & Steel Top/Napier 2nd Ring Set Included NoPRings
-PRC LS3 260CC CNC Cylinder Head
-Camshaft 242/250 .624/.624 112 LSA
Was hoping for 520whp though a 9" so I was just wanted to hear what you guys have to say here. Really wishing I had a higher compression ratio right about now...
-Texas Speed & Performance Custom Built Forged 402 CID
-Wiseco Forged Piston Set: 4.005' Bore, 4.000' Stroke, 6.125' Rod Length, -3cc Flat-Top, 1.110' CH, Wrist Pins & Steel Top/Napier 2nd Ring Set Included NoPRings
-PRC LS3 260CC CNC Cylinder Head
-Camshaft 242/250 .624/.624 112 LSA
Was hoping for 520whp though a 9" so I was just wanted to hear what you guys have to say here. Really wishing I had a higher compression ratio right about now...
Last edited by That_Z28_Camaro; 07-31-2015 at 12:47 AM.
#6
Old School Heavy
iTrader: (16)
Piston .005" down the hole = 10.95:1 compression (factory 9.240" deck height)
Piston .000 deck height = 11.08:1 compression (block deck milled .005" to 9.235")
Piston .005 out of the deck = 11.21:1 compression (block deck milled .010" to 9.230")
Last edited by speedtigger; 07-30-2015 at 03:58 PM.
#7
On The Tree
Thread Starter
There was no milling involved that I know of. I forget if it was 11.1 or 11.2 to be exact but I think he said 11.2. I'll just run this the way it is right now and see how it performs. Appreciate the help guys
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#8
LS1Tech Premium Sponsor
iTrader: (5)
I'd have to look at your specific build but pretty much every block that leaves gets decked to insure straightness. The 1.110 compression height is for a 9.235 deck height and I'm pretty positive the block was decked to 9.235. I've found that most motors are .003-.005 out of the hole.
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
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POWERBOND - ASP - AND MORE!
#10
On The Tree
Thread Starter
I'd have to look at your specific build but pretty much every block that leaves gets decked to insure straightness. The 1.110 compression height is for a 9.235 deck height and I'm pretty positive the block was decked to 9.235. I've found that most motors are .003-.005 out of the hole.
Awesome! That's reassuring so I shouldn't be that far off