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Generation IV Internal Engine
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Old 10-16-2009, 06:50 PM   #1
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Default ls3 heads on to lsx454

hi i was just woundering if i was to get an lsx 454 block and rotating asembley would my LS3 A6 heads,manafold,sump ect work or would i be better of with a compleat running 454 engine
??
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Old 10-20-2009, 01:12 AM   #2
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The LSX will take any type of LS based head, just have to get your pistons matched to your valve degree choice.

A LS3/L92 top-end would work just fine. You may want to port the heads to keep up with your large ci though.
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Old 10-20-2009, 02:19 AM   #3
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Originally Posted by sdbrown84 View Post
The LSX will take any type of LS based head, just have to get your pistons matched to your valve degree choice.

A LS3/L92 top-end would work just fine. You may want to port the heads to keep up with your large ci though.
I would have them ported and then send them to LME (I believe that is the company that has been doing this) to convert them to a 6 bolt head in order to hold the power since some people have had some issues lifting the heads on regular 4 bolt L92's in boosted applications.
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Old 10-20-2009, 02:54 AM   #4
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I would have them ported and then send them to LME (I believe that is the company that has been doing this) to convert them to a 6 bolt head in order to hold the power since some people have had some issues lifting the heads on regular 4 bolt L92's in boosted applications.
any one running a rhs 454 race block in std hight ??
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Old 10-20-2009, 04:25 AM   #5
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Those Mast Motorsport LS3 (ETP) 6 bolt big bore heads would work very well. They're 12 degree though.
http://www.mastmotorsports.com/news.php?id=14
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Old 10-20-2009, 01:53 PM   #6
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Those Mast Motorsport LS3 (ETP) 6 bolt big bore heads would work very well. They're 12 degree though.
http://www.mastmotorsports.com/news.php?id=14


I totally forgot about those. They are a grip but flow very well.
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Old 10-20-2009, 05:56 PM   #7
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Those Mast Motorsport LS3 (ETP) 6 bolt big bore heads would work very well. They're 12 degree though.
http://www.mastmotorsports.com/news.php?id=14
could you explain the 12.deg thing please
is that the angle of the valve seat ??
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Old 10-21-2009, 04:12 PM   #8
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if the valve is vertical on the pistons surface it`s 0 degrees (the best as the intake port or neck or throat what ever they call it will be vertical also and best for sucking the air charge)

old sbc mostly are 23 deg valve angle .... the 18 degree heads with larger valves and bigger intake ports produced major airflow and power and there are other race heads with less that 18 deg

the ls1 came stock with 15 deg heads

tfs are 13.5 deg

etp are 11 deg valve angel (corrected thanks stage7)

this is how I understood it .... it might help a bit

Last edited by Bader-X; 10-21-2009 at 05:15 PM..
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Old 10-21-2009, 04:49 PM   #9
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Originally Posted by Bader-X View Post
if the valve is vertical on the pistons surface it`s 0 degrees (the best as the intake port or neck or throttle what ever they call it will be vertical also and best for sucking the air charge)

old sbc mostly are 23 deg valve angle .... the 18 degree heads with larger valves and bigger intake ports produced major airflow and power and there are other race heads with less that 18 deg

the ls1 came stock with 15 deg heads

tfs are 13.5 deg

etp are 12 deg valve angel

this is how I understood it .... it might help a bit
ETP are 11 deg (LS1 castings)

The Ls7 casting is 12 deg
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Old 10-21-2009, 05:34 PM   #10
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Quote:
Originally Posted by Bader-X View Post
if the valve is vertical on the pistons surface it`s 0 degrees (the best as the intake port or neck or throat what ever they call it will be vertical also and best for sucking the air charge)

old sbc mostly are 23 deg valve angle .... the 18 degree heads with larger valves and bigger intake ports produced major airflow and power and there are other race heads with less that 18 deg

the ls1 came stock with 15 deg heads

tfs are 13.5 deg

etp are 11 deg valve angel (corrected thanks stage7)

this is how I understood it .... it might help a bit
that helps a lot thanks

BUT when you say valve is vertical to the piston at 0 deg for BEST AIR FLOW
do you mean the HEAD of the valve would be siting flat on top of the piston with the stem vertical to the piston top or laying down across the piston with the stem horizontal to the piston

what deg are stock LS3 heads ?? 15 deg


if you changed the heads to something with a differant angle etp say would need differant rocker gear and push rods ??

Last edited by red 454; 10-21-2009 at 05:43 PM..
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Old 10-21-2009, 05:50 PM   #11
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I totally forgot about those. They are a grip but flow very well.
what is a grip ?
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Old 10-22-2009, 07:02 AM   #12
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the first .... the valve face surface are facing the top of the piston (no angel)

there are a kit sold seperatly to use the etp heads for their valve angel ... check etp heads on texas-speed I think it`s listed there

I assume he means very expensive by grip ... maybe as it costs money that needs to be hold together by a grip not by a few fingers
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Old 10-22-2009, 06:32 PM   #13
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Quote:
Originally Posted by Bader-X View Post
the first .... the valve face surface are facing the top of the piston (no angel)

there are a kit sold seperatly to use the etp heads for their valve angel ... check etp heads on texas-speed I think it`s listed there

I assume he means very expensive by grip ... maybe as it costs money that needs to be hold together by a grip not by a few fingers
ok thanks for that
cheers
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Old 10-22-2009, 06:40 PM   #14
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Quote:
Originally Posted by Bader-X View Post
I assume he means very expensive by grip ... maybe as it costs money that needs to be hold together by a grip not by a few fingers
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Old 10-22-2009, 11:17 PM   #15
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My honest opinion is if i can afford to do a lsx 454 i ain't putting a set of l92s on-

I would want the best head i could get for my money to really make use of the cubes-
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Old 10-23-2009, 12:56 AM   #16
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My honest opinion is if i can afford to do a lsx 454 i ain't putting a set of l92s on-

I would want the best head i could get for my money to really make use of the cubes-
what is differant about L92 from ls3 ?? (arr they are the same I dident read your post wright)
only to get it running while saving up for the PD

Last edited by red 454; 10-23-2009 at 01:53 AM..
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Old 10-23-2009, 01:12 AM   #17
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Originally Posted by SmokedOutZ28 View Post
at least say if I guessed it right
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Old 10-23-2009, 01:45 AM   #18
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Are you talking stock ls3 heads that you want to put on or aftermarket. Doesn't the LSX454 come with LSX heads that are supposed to flow great?
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Old 10-23-2009, 01:57 AM   #19
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Are you talking stock ls3 heads that you want to put on or aftermarket. Doesn't the LSX454 come with LSX heads that are supposed to flow great?
STOCK LS3 just for a while to see how the 454 bottom end goes reliability wise
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Old 10-27-2009, 11:58 PM   #20
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Originally Posted by KW4life06 View Post
Are you talking stock ls3 heads that you want to put on or aftermarket. Doesn't the LSX454 come with LSX heads that are supposed to flow great?
So they say-

He is taking of using his factory gm ls3 heads on the 454 that he wants to build
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Old 10-27-2009, 11:58 PM
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135, 18, 437, airflow, bolt, degree, head, heads, l92, lifting, ls3, lsx, lsx454, mast, na, stock


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