Tune needed after milling heads? /+ compression
Thread Starter
Safety Car
Joined: Feb 2016
Posts: 3,664
Likes: 388
From: Killeen Texas
Tune needed after milling heads? /+ compression
sent heads off to AHP for moldstar90 guides, hollow SS valves, valve job, no porting. im also having them mill the heads .025" for a little compression increase.
will i need a retune after this? technically the air/fuel ratio shouldn't have changed i wouldnt think?
will i need a retune after this? technically the air/fuel ratio shouldn't have changed i wouldnt think?
Last edited by STANG KILLA SS; Nov 18, 2016 at 10:55 AM.
Melting Slicks
Joined: Jun 2006
Posts: 2,497
Likes: 261
From: Miami Florida
If milling make it count every 6 thous milled will net 1/10th of compression so .030 is about 1/2 point 11.2 11.3 for pump gas is safe.
Melting Slicks
Joined: Nov 2016
Posts: 2,307
Likes: 1,582
From: East Metro (Twin Cities) Minnesota
St. Jude Donor '21
Scan for more than a blip or two of knock when you get it back. Knock could increase with more compression so some timing tweaks could be needed.
Le Mans Master
Joined: Dec 2003
Posts: 5,047
Likes: 252
From: San Diego
My comment was based on preserving the quench, why mill the heads when you could do a .030 head gasket? If one is wanting .040 then mill .010 and then use .030 gasket. My point being people change combos all the time (not saying OP is or will) but milling heads that much is a commitment. My opinion has be stated, I digress
