Heads info needed
10-17-2006, 06:58 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Heads info needed I just picked up a set of 853 heads hand ported with stock valves and 918 springs. Im going to run these with a 224/224 .564 112 cam or a 224/228 .563 112 cam. I want to know how much to mill these heads to get me close to a 10:9:1 compression using new stock head gaskets? Also if i mill these to get this compression what length pushrods do i need? I havent bought the gaskets so im open to sugestions. thanks
10-17-2006, 09:31 PM
#3
TECH Regular
iTrader: (1)
Join Date: Apr 2006
Location: albany ny
Posts: 480
Likes: 0
Received 0 Likes
on
0 Posts
what is your reason for using a stock sized head gasket? Using a thinner one from Cometic or whichever company you prefer will get you a better quench area and you'll have to cut the heads less which is good if you ever want to re sell them. Just my $.02
Good Luck
AJ
Good Luck
AJ
10-17-2006, 10:24 PM
#4
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ArrestMeRed99Z28
what is your reason for using a stock sized head gasket? Using a thinner one from Cometic or whichever company you prefer will get you a better quench area and you'll have to cut the heads less which is good if you ever want to re sell them. Just my $.02
Good Luck
AJ
Good Luck
AJ
10-19-2006, 02:28 PM
#7
Staging Lane
Join Date: Aug 2006
Location: Suffolk, NY
Posts: 51
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by muncie21
Make sure the 853's don't have the infamous notch in them (mine do) if so you'll need to run composite gaskets to seal them.
What notch?
Trending Topics
10-19-2006, 04:54 PM
#8
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Gunnar@Patriot
If you use a cometic part #C5788-040, mill the heads approx. .018", you should end up with a compression of approx. 10.9-11.0.
10-19-2006, 04:55 PM
#9
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by muncie21
Make sure the 853's don't have the infamous notch in them (mine do) if so you'll need to run composite gaskets to seal them.
10-19-2006, 05:21 PM
#10
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Also how much do i mill these using stock gaskets #12498543 to get arround a 11:0 compression? (The heads are not a big deal, so resale is not a concern) thanks
10-19-2006, 06:43 PM
#11
TECH Enthusiast
iTrader: (14)
Join Date: Apr 2005
Location: NE Ohio
Posts: 591
Likes: 0
Received 0 Likes
on
0 Posts
The info below was originally posted by SDPC (can't find the post now) but it tells you all you would want to know about 'the notch'.
BTW, my 853 heads from a 99 had the notch...and guess what..they leaked when I used MLS gaskets on them.
Enjoy.
BTW, my 853 heads from a 99 had the notch...and guess what..they leaked when I used MLS gaskets on them.
Enjoy.
10-19-2006, 07:13 PM
#12
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by muncie21
The info below was originally posted by SDPC (can't find the post now) but it tells you all you would want to know about 'the notch'.
BTW, my 853 heads from a 99 had the notch...and guess what..they leaked when I used MLS gaskets on them. Enjoy.
BTW, my 853 heads from a 99 had the notch...and guess what..they leaked when I used MLS gaskets on them.
Enjoy.
10-19-2006, 08:13 PM
#13
TECH Enthusiast
iTrader: (14)
Join Date: Apr 2005
Location: NE Ohio
Posts: 591
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Long Beach
Ok, yes mine have the notch you are talking about. If i just get some GM gaskets #12498543 this is the gaskets for the earlier year ls1's should work to seal that notch up right? What gaskets did you end up using then? thanks
I ended up putting 317 (6.0L) heads on mine and used the 6.0L MLS gasket. Works great, no complaints.
10-19-2006, 08:21 PM
#14
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by muncie21
The earlier head gaskets should have different part numbers for right/left side. They are composite gaskets, as apposed to MLS ones, also.
I ended up putting 317 (6.0L) heads on mine and used the 6.0L MLS gasket. Works great, no complaints.
I ended up putting 317 (6.0L) heads on mine and used the 6.0L MLS gasket. Works great, no complaints.
10-19-2006, 09:35 PM
#16
TECH Enthusiast
Thread Starter
iTrader: (51)
Join Date: Apr 2006
Location: socal
Posts: 641
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by muncie21
Sounds like it's a kit. It should work, provided it's the composite gasket. Really easy to tell the difference.
02-26-2012, 09:46 AM
#17
Teching In
Join Date: Apr 2010
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
older heads on my 02 trans am Help i recently got a set of 806 heads with a bunch of cnc work by slp got the flow numbers from them there pretty good anyways i put them on my car havent started it yet. im hearing the head gaskets are not compatable with older heads and its going to spew coolant is this true help. if it is what gaskets do i run