Ported 243 heads good enough for a 402?
Ported 243 heads good enough for a 402? A friend is building a 402 using the LS7 crank and rods with a custom set of 4.005 pistons. The pistons (flat top) will put the motor at 12:1 with 64cc heads, which we're hoping will run on pump fuel. The enigne is for a street driven, pump gas 98 Camaro. It will be sprayed occasionally with a small shot plus race fuel for the nitrous. He definitely wants to stay with a hyd. roller cam, stock rockers, and pump fuel. The intake he has is an LS6. Headers are 1 7/8" Kooks.
He has access to a set of Livernois Stage II CNC 243 casting heads. Will these heads be enough for this motor, or will he be wasting a lot of power by using them instead of an L92 or aftermarket head? What kind of power would he make with these heads?
He has access to a set of Livernois Stage II CNC 243 casting heads. Will these heads be enough for this motor, or will he be wasting a lot of power by using them instead of an L92 or aftermarket head? What kind of power would he make with these heads?
A friend is building a 402 using the LS7 crank and rods with a custom set of 4.005 pistons. The pistons (flat top) will put the motor at 12:1 with 64cc heads, which we're hoping will run on pump fuel. The enigne is for a street driven, pump gas 98 Camaro. It will be sprayed occasionally with a small shot plus race fuel for the nitrous. He definitely wants to stay with a hyd. roller cam, stock rockers, and pump fuel. The intake he has is an LS6. Headers are 1 7/8" Kooks.
He has access to a set of Livernois Stage II CNC 243 casting heads. Will these heads be enough for this motor, or will he be wasting a lot of power by using them instead of an L92 or aftermarket head? What kind of power would he make with these heads?
He has access to a set of Livernois Stage II CNC 243 casting heads. Will these heads be enough for this motor, or will he be wasting a lot of power by using them instead of an L92 or aftermarket head? What kind of power would he make with these heads?
Yes they will work. he will just be leaving alot on the table with the heads and ls6 intake. I had a set of ported stock heads,gained 40hp going to A.F.R's and another 20hp going to a fast intake.
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Patriot's have been known to flow less than PRC's but I'm not sure about the livernois 2.5's. My heads (PRC) flowed 307 @ .600 and they are stage 1's with a stock size valve. I have heard of patriots flowing as bad as 290 @ .600 with there stage 1 head. IMO there isnt a better budget head than a PRC stage 1 LS6 or there 5.3 2.5's.
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Staging Lane
Joined: Nov 2008
Posts: 96
Likes: 0
From: Belen, NM
My C6 with a 404 should be on the dyno next week. We went with ported 243 heads with bigger valves. Heads flow over 330 cfm. Also have a ported FAST92. I will update with my numbers. I think if the OP is going with the LS6 intake then the 243 heads will work good. Definately some power out there with a good aftermarket (AFT, TFS), but that is another $2500 bucks for those.
Patriot's have been known to flow less than PRC's but I'm not sure about the livernois 2.5's. My heads (PRC) flowed 307 @ .600 and they are stage 1's with a stock size valve. I have heard of patriots flowing as bad as 290 @ .600 with there stage 1 head. IMO there isnt a better budget head than a PRC stage 1 LS6 or there 5.3 2.5's.
my old ls6 style patriot stage III's flowed 318 and patriot clamims 320 thats pretty close and for only 1200 new or around 800 used i have seen them go as low as 600 i even paid 575 shipped for a pair
thanks Fraser you guys rock ! yes there is more to do but on a budget they work well 
https://ls1tech.com/forums/drag-raci...k-results.html
https://ls1tech.com/forums/drag-raci...k-results.html
Great results bro. Glad to hear your happy with the PRC LS6 Heads!!
Here's some pics of the PRC's Newest LS6 heads, we're about to run a special next week! PRC 2.5 LS6 heads for 2.5 5.3l price!!!
Here's some pics of the PRC's Newest LS6 heads, we're about to run a special next week! PRC 2.5 LS6 heads for 2.5 5.3l price!!!
Patriot's have been known to flow less than PRC's but I'm not sure about the livernois 2.5's. My heads (PRC) flowed 307 @ .600 and they are stage 1's with a stock size valve. I have heard of patriots flowing as bad as 290 @ .600 with there stage 1 head. IMO there isnt a better budget head than a PRC stage 1 LS6 or there 5.3 2.5's.
__________________
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
