How Much HP From Ported Heads?
How Much HP From Ported Heads? How much power does ported heads add to a cammed engine. For example a 230 580 114 cam that makes 400hp. Would ported heads with stock valves add 40-50hp?
I doubt you'd see that much with stock valves (Stage 1 usually), probably more like ~20 IMO. Add a S2 head with 2.02+ and 1.55+ valves from AS, TEA, MTI, etc and you'd probably see 40+.
Shawn
Shawn
I got 34rwhp with a set of TEAs 5.3s I installed. Ive also installed a set of Patriot 5.3s and gotten 17rwhp. Got 46rwhp out of a set of Futral Motorsport LS6 heads on a stock internal motor as well. Bottom line, results will vary. Goodluck
On The Tree
Joined: Jul 2002
Posts: 109
Likes: 0
From: Edmonton, Alberta
Everything works as part of a system, the heads may or may not be costing you power. Absolute has a sale on now I believe, and bang for the buck or not, you should be building your engine around the cylinder heads. The better the heads (assuming all the correct associated parts) the more power you will make. Horsepower is all about how quickly you can burn fuel, and the heads are the key, flowing directly into and out of the combustion chamber. I don't see how one can be "wasting money" on quality ported heads...
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Originally Posted by Cammin BeaSSt
34rwhp for 1500 bucks seems like a decent gain to me??!?!?!!?!?! Power under the curve is also higher from 4500 up usually.....
Id like to get 50hp out of $1000 ported heads. Lol I know keep dreaming. The reason I want to stay with stock valves is the bigger vavles might be too heavy for 918 springs. The dual springs and retainers can start to get expensive along with adding more stress to the stock lifters and rockers.
35hp should be easy for just about any ported heads. I figure 10hp from added compression and 25hp from the porting would be reasonable.
The limitation of my current set up will definitly be the mac headers. The 230 .578" cam is a little short on lift but has plenty of duration. I like the lower lift anyways since its easier on springs.
35hp should be easy for just about any ported heads. I figure 10hp from added compression and 25hp from the porting would be reasonable.
The limitation of my current set up will definitly be the mac headers. The 230 .578" cam is a little short on lift but has plenty of duration. I like the lower lift anyways since its easier on springs.
Patriots come with dual springs, Titanium retainers, and bigger valves for $1295. If your looking to get out cheaper, I have a set of ported 5.3's, with stock valves, and competition valve job I need to unload. Just heads and valves, you use your springs, etc. E-mail for more info. Beast96Z@team.camaroz28.com
Originally Posted by dug
How much power does ported heads add to a cammed engine. For example a 230 580 114 cam that makes 400hp. Would ported heads with stock valves add 40-50hp?
with stock valves i would say no way...I think its possible to gain 30-50 with heads alone though as long as youve got a cam & headers...depending on what version 5.3, 5.7, LS6 and what stage and options you have since everyones S2 heads vary from the next.
lata
Bill
I think we may be spoiled. I stumbled across a Super Chevy head comparison article. It seems that of the 37 SBC heads tested, stock LS6 heads outflowed all 7 GM heads and 22 aftermarket SBC heads. They even outflowed seveal BBC heads. Stock LS1 heads outflowed all 7 GM SBC heads and over half of the aftermarket SBC heads. So maybe we can't expect to gain a ton of power with ported heads 
yah you really SHOULDNT expect much from a ported ls head...the stockers are thee best factory head gm ever produced...of course theres always room for improvement but to what extent? I couldnt see myself paying 2 grand or more for a set of ported heads for my car when the stockers flow over 240cfm on the intake side...for years the cam has been the weak part of most GM SM motors...from the mid 80's 305's to the lt1 to the ls1 motor...most gain nearly 50hp by going to a mild cam and headers...which can be bought for under a grand and installed in less than a day. The reason i bought mine is two fold 1. It came with dual springs so right there if i were to do a cam swap that would save me $200...my heads were only 995 to begin with and no core so now your talking what value i could get for my stockers...probably not much but lets say $100 so now that set of heads is looking pretty good if you wanted to get them in the future to maximize your combo anyways... 2. Price i mean really for under a grand i couldnt pass them up...the install is realatively straight foward and can be done with a friend in about 4-6hrs and wont need any computer tuning so thats why i went that route first. I know they'll probably only give me 10-20hp right now but i wont have to tune the car now and then after a cam if i dont want to to get the car running right...if i did a cam first i wouldve had to tune it then more than likely to get evertything strait then whos to say i wouldnt have gotten heads 6 months down the line adn had to get tuned in again.
lata
Bill
lata
Bill
Originally Posted by hondadream50
what are the cheapest heads you can put on the 2002 Ls1 that give the most power and be smog legal for ca? Also can you get HP without changing the cam like 20-30? thanks
steve
steve
Here is my fear. I see a lot of people running similar cams to my own with Stg 2 heads and barely making 400 rwhp and 375 rwtq. I make 395 rwhp and 375 rwtq thru a 12 bolt w/ 4.11 and stock SS wheels. I made the same power without tuning through my stock 10 bolt w/ 3.42's. I figure that after tuning I would have made b/t 405-410 rwhp and 385-390 rwtq with my stock rear and gears. I fear that after market heads will do nothing fo me. What do you all think.