Ordered Mast Small Bore LS3's
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
Ok. Head gaskets:
I've got 3 different recommendations.
One says 5.7 or 3.910 cometics.
Another says the 4.035 cometics.
Both being the .040's, of course.
What's the proper head gasket for these things? While at Cam Motion we placed a stock GM 6.0/6.2 gasket on, and it looked like it barely fit.
I don't want excess gasket hanging inside, obviously.
What way do you guys normally measure chamber diameter. I'm not to enthused putting metal calipers on the inside of the chambers to measure. Maybe make a paper trace like you would an old headstone to read it, and measure that?
Thanks in advance
I've got 3 different recommendations.
One says 5.7 or 3.910 cometics.
Another says the 4.035 cometics.
Both being the .040's, of course.
What's the proper head gasket for these things? While at Cam Motion we placed a stock GM 6.0/6.2 gasket on, and it looked like it barely fit.
I don't want excess gasket hanging inside, obviously.
What way do you guys normally measure chamber diameter. I'm not to enthused putting metal calipers on the inside of the chambers to measure. Maybe make a paper trace like you would an old headstone to read it, and measure that?
Thanks in advance
Ok. Head gaskets:
I've got 3 different recommendations.
One says 5.7 or 3.910 cometics.
Another says the 4.035 cometics.
Both being the .040's, of course.
What's the proper head gasket for these things? While at Cam Motion we placed a stock GM 6.0/6.2 gasket on, and it looked like it barely fit.
I don't want excess gasket hanging inside, obviously.
What way do you guys normally measure chamber diameter. I'm not to enthused putting metal calipers on the inside of the chambers to measure. Maybe make a paper trace like you would an old headstone to read it, and measure that?
Thanks in advance
I've got 3 different recommendations.
One says 5.7 or 3.910 cometics.
Another says the 4.035 cometics.
Both being the .040's, of course.
What's the proper head gasket for these things? While at Cam Motion we placed a stock GM 6.0/6.2 gasket on, and it looked like it barely fit.
I don't want excess gasket hanging inside, obviously.
What way do you guys normally measure chamber diameter. I'm not to enthused putting metal calipers on the inside of the chambers to measure. Maybe make a paper trace like you would an old headstone to read it, and measure that?
Thanks in advance
My guess reading your post is that you didn't purchase those heads from FlowTech...
Christian
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
That's the issue. Nobody im aware of has installed a set of these, which is why there's next to no info out on them. Even if Vengeance or anyone else answered me, it'd be the same responses I got, as they'd call Mast and ask too.
You definitely don't want gasket overhanging the chamber or the bore.
The 3.91" is the obvious choice for the bore but it seems that the larger gasket was needed to not obstruct the chamber (if I understand you right)
Seems weird to me that a head designed for a 3.9" bore would have a CNC'd chamber which is larger than that. I mean sure it will effectively unshroud the valves but then what....there's a ledge sitting there and an even larger gasket quench area which wont properly burn and will elevate the BSFCs
I'm thinking a higher power is trying to coax you into a 4 X 4 combo
The 3.91" is the obvious choice for the bore but it seems that the larger gasket was needed to not obstruct the chamber (if I understand you right)
Seems weird to me that a head designed for a 3.9" bore would have a CNC'd chamber which is larger than that. I mean sure it will effectively unshroud the valves but then what....there's a ledge sitting there and an even larger gasket quench area which wont properly burn and will elevate the BSFCs
I'm thinking a higher power is trying to coax you into a 4 X 4 combo
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
It's just odd. One said 6.0/6.2, one said 5.7, but their engine builder there said 5.7 (3.910), but they said they've never built a motor with them, so it just threw me off.
When I get back home off the rig I'll pull em out again and caliper measure. It probably is the 3.910's.
When I get back home off the rig I'll pull em out again and caliper measure. It probably is the 3.910's.
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
I know the 3.910 will fit the bore, no issues. The chamber... I got different answers from different people. I'm just going to measure it (the chamber) when I come home.
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Verdad Gallardo Honey, you know those two really shiny expensive things that are in those boxes; Can you carefully remove one and take a tape measurement of the chamber casting around those two little round shiny valve thingies.....LOL
Less than 4 inches
four inches
more than 4 inches
Thanks babe you're the best !!!!
The LS1TECH community thanks you........
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
Dave calls wife..... Honey, you know those two really shiny expensive things that are in those boxes; Can you carefully remove one and take a tape measurement of the chamber casting around those two little round shiny valve thingies.....LOL Less than 4 inches four inches more than 4 inches Thanks babe you're the best !!!! The LS1TECH community thanks you........
Sweet man, I appreciate it.
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
Thread Starter
Joined: Apr 2009
Posts: 6,717
Likes: 24
From: Lafayette, LA
