Is compression release mandatory for 107 build?
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Extreme HDF Member
Joined: Sep 2006
Posts: 10,114
Likes: 29
From: Vancouver B.C. Canada
Is compression release mandatory for 107 build?
I got a pair of spare black 96 jugs sitting on the shelf, ready to bore them out for some 107 flat top pistons. Do I have to install compression release? Is it possible to crank the motor without ACR? Tell me your story 
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
Depends on came and dynamic compression and static compression and compression ratio. Jamie told me with the 107 and 555 combo I will be fine but $50 to have the heads machined im going to do it anyways.
Stellar HDF Member
Joined: Aug 2009
Posts: 3,212
Likes: 212
The need for compression releases usually comes in around 10:1 and up static ratios, but it really depends on your build items to accurately determine.
Ultimate HDF Member
Joined: Mar 2007
Posts: 7,465
Likes: 15
From: Corona, Ca
I've talked to quite a few engine builders and they all said I'd be fine without compression releases but my heads will be off anyways so why not
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Tourer
Joined: Aug 2011
Posts: 394
Likes: 0
From: west coast. Canada
can't hurt to put em in. better now than later, and it will be easier for your battery to crank your starter. plus they are cool to have when other guys don't hehe
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