Mast Small Bore Rectangle Port Heads
TECH Senior Member
Joined: Jul 2009
Posts: 8,034
Likes: 663
Any chance of geting youe LS3/L92 stage 2 heads flow data on a 4.0 (or a .4.030 or 4.065) bore?
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
I'd go with the GM performance parts CNC LS3 heads. Cheap and effective out the box. If you didn't have to run rectangle port heads, but they had to be stock style then the Pro Comp CNC 243's look very promising. Even having the smallest port volume out of all the heads in that shootout (215cc) they made the most peak power, even over TFS, AFR and Mast.
Ok, so I'm confused. You say this motor has to have "stock style" heads. The you say its an LS9. And Ls9 is a 6.2L. The only motor with 6.0 are L76/L92 which are the 6.0L truck motors and a few Ls series cars (like some of the Holdens as an example). The Mast heads are an aftermarket casting. So, if you have a class that requires Stock casting numbers those heads won't make it.
So, what are the restrictions on what you are looking for, and is it really a 6.0L or a 6.2L?
Read the hot rod test without a doubt. I think you'll find there are lots of good cathedral options that will do very well next to the current rectangle port heads out there. We're working on a Ls3 style head that hopefully will be ready in a month or two, and I'm finishing a small bore LS7 head, but it requires a 4.060" bore minimum.
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
The car comes with an LS9, so using cathedral port heads will not work per the rules. We don't have to use the stock motor, and utilizing a 6.0 means a larger restrictor. Since the mast heads are based off a factory casting (not canted or anything crazy) then we can use them.
No way the Mast heads are $2,000 more..... here you go $3,000 for a set ready to bolt on.
P/N 510-302
Retail: $1499.99 ea
Flow Data w/4.000" Bore Plate
Lift Intake Exhaust
0.100 74 61
0.200 146 119
0.300 222 188
0.400 282 219
0.500 330 236
0.600 360 251
0.700 372 260
I have owned or seen all these heads on the dyno and the Mast/old ETP heads made the most HP and are superior quality.
P/N 510-302
Retail: $1499.99 ea
Flow Data w/4.000" Bore Plate
Lift Intake Exhaust
0.100 74 61
0.200 146 119
0.300 222 188
0.400 282 219
0.500 330 236
0.600 360 251
0.700 372 260
I have owned or seen all these heads on the dyno and the Mast/old ETP heads made the most HP and are superior quality.
Btw, i have been keeping up with ur car and alls i can say is its a bad bitch! Keep up the good work!
