Gains from porting stock heads w/stock cam?
if the engine is on the outs why not go out with a BOOM
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Joined: Mar 2002
Posts: 2,058
From: near waco tx.
Re: Gains from porting stock heads w/stock cam?
i have read this thread and there are so many false statements its a shame.
first your no going to see a 69 hp gain from ported heads on a stock car.
i dont know what this means at all, and how torqe makes a cam choppy?
i how you meant exhaust ports and not exhaust manifolds.
a cam install does not cause a spun bearing, and head cam install can. the difference is that the heads hold torqe on the block and the bearing have wore with that block torqed a certain way, with those heads, pull those heads off and put another set on and the block is torqed a different way, maybe one or two thousanths different but just enough to spin a mian beraing.
when you increase airflow from the heads, essentially you're going to move the torque curve up, and since horsepower = torque x rpm / 5252, even if the engine still only makes 300ft lbs of torque, if it makes it at 5500 rpm, it'll make 314 horsepower. chances are it'll make more than 300 ft lbs of torque, maybe not all the way to 5500 rpm, but it'll be close.
adding a cam moves the torque curve up too, that's why you have to use a stall with a big cam, that's why the idle is so choppy....
If a monkey isn't doing the port job and you have them do your intake and exhaust manifolds, the results will be well worth it!
The point of not doing the cam is not spinning a bearing. That is the point. A 200 dollar cam turns into a total re-build and most can't re-build motors by themselfs. So you are talking a nice chuck of change just to put new bearings in. If i knew i wouldn't spin a bearing.....i'd have droped in a cam a long time ago. but i've seen way to many people spin bearings.
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Joined: Feb 2004
Posts: 4,800
Re: Gains from porting stock heads w/stock cam?
This is the first time I swa this post since my last reply hence the late reply to a request made of me. http://impalassforum.com/noncgi/ulti...=008058#000004 Not a dyno chart but Karl the guy who lost power is a well respected and knowledgable member of that forum and a moderator at that, any guy that makes an Impala go 12.3 with ported heads(aluminums) and a 227(210/224 Crane) cam as the power mods deserves respect that is a whole lot of car and a very "mild" cam. Yes the irons flow more than the aluminums through 95 the 96-7 aluminums caught up to the irons flow wise.
Registered User
Joined: Dec 2001
Posts: 355
From: clinton twp. MI, USA
Re: Gains from porting stock heads w/stock cam?
I'm still running my stock cam. I have full bolt ons, 1.7rrs and have a very decintly ported LT1 heads and intake. 11.2.1 compression. I have beaten 3 03 cobras, ls1 vettes all day, moded ls1 fbodys...... This is in a Heavy Trans am Convertible. 350ci full bolt ons but stock cam. 1.7rr. Im thinkin w the combo of good ported heads and intake w the 1.7rr makes some power. more than 10hp....
Registered User
Joined: May 2001
Posts: 609
From: Quad Cities
Re: Gains from porting stock heads w/stock cam?
With a set of ported heads I ran 14.3 @ 103mph on a 2.6 60ft...
(only had a few runs since it was pretty packed the night I went...traction sucked)
Stock cam, stock manifolds, mods in sig (obviously minus cam and headers).
It may not be incredible gains..but its going to be more than just 10rwhp.
(only had a few runs since it was pretty packed the night I went...traction sucked)
Stock cam, stock manifolds, mods in sig (obviously minus cam and headers).
It may not be incredible gains..but its going to be more than just 10rwhp.
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