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383 head swap #236681 02/26/09 11:23 AM 02/26/09 11:23 AM
Joined: May 2008 Posts: 42 S Williamsport T therick OP member
therick OP member T Joined: May 2008 Posts: 42 S Williamsport	I have a 1971 383 2brl. I want a little more out of it.Is it worth swapping the heads for a set of 916's that I have. How much more compression do you think it will give me? I plan on using this cam (Advertised Duration 272/ 282, Lift .442/ .465). auto with a 2800 stall converter and 4:10 gears. Car is 3500 lbs.

Re: 383 head swap [Re: therick] #236682 02/26/09 11:31 AM 02/26/09 11:31 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	906's or 915's live every 24 hour block of time like it's your last day on earth

Re: 383 head swap [Re: therick] #236683 02/26/09 11:50 AM 02/26/09 11:50 AM
Joined: Mar 2005 Posts: 3,152 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,152 Central NC	If you switch to a set of 915 or 516 closed chamber heads it will likely give you a .5 increase in compression.If you are going to swap them maybe mill them enough to get it up to 9.5=1.That will work really well with the cam you have picked. If you use the 516 heads enlarge the exhaust valve to your 1.74 stock size. If you have a 906 head it will give you no increase at all.

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