compression help for build
compression help for build So I had bought an lt4 block a while back and with my lt1 spinning a bearing it's time to finish the build. I bought the block pre-assembled block is bored 40 over
speed pro l2256f (+6.10)
stock length rods
stock crank
stock lt1 heads
Do to budget constraints I've decided with the cc503 I was wanting to run at 11.5:1 or higher static compression
the problem im having is that i my dynamic compression is high is 10+ i know many suggest 9.1:1to be the highest to safely run it on 93 oct
so what should i do lower it mill the heads don't really have money for that buy a super thick head gasket or is it safe to run iti may be entering the wrong numbers not sure
speed pro l2256f (+6.10)
stock length rods
stock crank
stock lt1 heads
Do to budget constraints I've decided with the cc503 I was wanting to run at 11.5:1 or higher static compression
the problem im having is that i my dynamic compression is high is 10+ i know many suggest 9.1:1to be the highest to safely run it on 93 oct
so what should i do lower it mill the heads don't really have money for that buy a super thick head gasket or is it safe to run iti may be entering the wrong numbers not sure
TECH Fanatic
Joined: Jul 2007
Posts: 1,800
Likes: 327
From: Wilmington, De
Milling the heads will raise the compression; not lower it.
Can you provide the specs of everything?
Bore
Stroke
Combustion chamber size
Head gasket bore
Head gasket thickness
Piston dome/dish size
Piston deck clearance
Can you provide the specs of everything?
Bore
Stroke
Combustion chamber size
Head gasket bore
Head gasket thickness
Piston dome/dish size
Piston deck clearance
TECH Addict
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
If you use the Impala head gaskets, I come up with 11.45 SCR, and 9.02 DCR with that cam and rod length.
Those pistons will not work. The part number is for stock bore, you're 0.040 over..... But I used the dish volume for calculatione with the 4.040 bore.
I'm also assuming stock to spec deck height.
Those pistons will not work. The part number is for stock bore, you're 0.040 over..... But I used the dish volume for calculatione with the 4.040 bore.
I'm also assuming stock to spec deck height.
The Pistons are l2256f040 (+6.10cc)
stock heads 54cc
i was using stock deck height and i was using .015 found that number on a website that had the info on it haven't got it measured yet
i don't have a headgasket yet been waiting to figure out what compression to run but it will have a 4.100 or high bore size
stock heads 54cc
i was using stock deck height and i was using .015 found that number on a website that had the info on it haven't got it measured yet
i don't have a headgasket yet been waiting to figure out what compression to run but it will have a 4.100 or high bore size
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