Should i Raise the Compression?
Thread Starter
Launching!
Joined: Apr 2004
Posts: 254
Likes: 0
From: Roanoke, Va.
Should i Raise the Compression? Well I got word from the machine shop saying it would be best to bore my block because of the run-out from the 135k on it. So i'm going to need to new pistions and i was wondering. Should i raise compression to say 11:1(or maybe higher) or just stay with the stock 10.4:1?
Thanks
Thanks
On The Tree
Joined: Mar 2004
Posts: 162
Likes: 0
Can you up the compression on and LT1 and not have to worry about emissions?...I am getting some LT1 heads port n polished, and LT4 hotcam and this thread made me think , would upping the compression be safe on my block? and if so how far could i take it without having to worry about any problems? and how much difference would that make?
(sorry about all the question and hi-jacking the thread, but i dont know much about compression so im trying to figure all this out)
(sorry about all the question and hi-jacking the thread, but i dont know much about compression so im trying to figure all this out)
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TECH Resident
Joined: Jun 2002
Posts: 943
Likes: 2
From: Houston
compression wont affect your block and wont have any real significant adverse affects on your emissions. I would upgrade head gaskets to be safe and check PtoV clearances but thats about it on a stock bottom end.
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Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
I ran 10.9 for a few years. next motor is going to be 12.0 
I bet after measuring your piston to deck and checking every thing you are barely at 10.2. we found my motor to hold a .032 piston to deck and not the normal .025. Check it and see where you are at. then you can go to a Impala gasket (.029 or so) and maybe shave the heads. You may even get Corteco or another custom head gasket a little thinner to get where you want to go.
On the next motor I am going to cut the deck to clean it up and square it. Then we will take measuremnets to have pistons made for what I want toget the piston in the hole. After we assemble the short block I will order head gaskets to get the proper Quench for the most power and 12:1 CR
Good luck
I bet after measuring your piston to deck and checking every thing you are barely at 10.2. we found my motor to hold a .032 piston to deck and not the normal .025. Check it and see where you are at. then you can go to a Impala gasket (.029 or so) and maybe shave the heads. You may even get Corteco or another custom head gasket a little thinner to get where you want to go.
On the next motor I am going to cut the deck to clean it up and square it. Then we will take measuremnets to have pistons made for what I want toget the piston in the hole. After we assemble the short block I will order head gaskets to get the proper Quench for the most power and 12:1 CR
Good luck
Launching!
Joined: Jul 2004
Posts: 273
Likes: 1
From: HighDesert California
Originally Posted by 5432LT1
Can you up the compression on and LT1 and not have to worry about emissions?...I am getting some LT1 heads port n polished, and LT4 hotcam and this thread made me think , would upping the compression be safe on my block? and if so how far could i take it without having to worry about any problems? and how much difference would that make?
(sorry about all the question and hi-jacking the thread, but i dont know much about compression so im trying to figure all this out)
(sorry about all the question and hi-jacking the thread, but i dont know much about compression so im trying to figure all this out)
again, always talk to ur machinest..
