LesNTea,
Did he say where the HP peak would occur in the RPM band? What about torque? Is there any loss of low-end torque (or top-end torque, for that matter)? How big are the valves he's going to put in? And at what lift will the heads flow 230 cfm? If they won't flow 230 cfm until .700" lift, it won't do you any good with the stock cams.
$1200 for a good head porting isn't that expensive. Go onto LS1.com and do a search for Joe Prince (he's the ONLY head porter I would ever use). He charges anywhere from $1200-$1800 for a set of heads (with you doing the R&R and shipping), but most of his head packages will net 50+ rwhp with stock cams and 100+ with a cam change. Well worth the money.
I studied a lot with him and his flow bench and learned that flow figures are NOT the way to port heads. Heads should be ported to velocity index mainly; flow figures are a by-product. I would question this guy on all the points I brought up, including asking him what the velocity index is at each .100" lift increment.
And the guy on the corral that does them for ~$400... I'll bet that he simply hogs out the heads and makes great flow figures, but won't pull squat worth on the dyno (until 6500 rpm) and will fall on its face at the track.
Hope this helps you with your shopping. I'm not suggesting that you use my guy (although I'm sure you'd be VERY happy with the results; e-mail/post a reply if you want his contact info), but at least if you know the right questions to ask, you'll be happier with the end results instead of wondering where your money went. :smile:
_________________
John
DHG #4851
Steeda Tri-Ax, Hurst chrome stick with black ball
<font size=-1>[ This Message was edited by: retromuscle on 2002-02-08 08:15 ]</font>
Did he say where the HP peak would occur in the RPM band? What about torque? Is there any loss of low-end torque (or top-end torque, for that matter)? How big are the valves he's going to put in? And at what lift will the heads flow 230 cfm? If they won't flow 230 cfm until .700" lift, it won't do you any good with the stock cams.
$1200 for a good head porting isn't that expensive. Go onto LS1.com and do a search for Joe Prince (he's the ONLY head porter I would ever use). He charges anywhere from $1200-$1800 for a set of heads (with you doing the R&R and shipping), but most of his head packages will net 50+ rwhp with stock cams and 100+ with a cam change. Well worth the money.
I studied a lot with him and his flow bench and learned that flow figures are NOT the way to port heads. Heads should be ported to velocity index mainly; flow figures are a by-product. I would question this guy on all the points I brought up, including asking him what the velocity index is at each .100" lift increment.
And the guy on the corral that does them for ~$400... I'll bet that he simply hogs out the heads and makes great flow figures, but won't pull squat worth on the dyno (until 6500 rpm) and will fall on its face at the track.
Hope this helps you with your shopping. I'm not suggesting that you use my guy (although I'm sure you'd be VERY happy with the results; e-mail/post a reply if you want his contact info), but at least if you know the right questions to ask, you'll be happier with the end results instead of wondering where your money went. :smile:
_________________
John
DHG #4851
Steeda Tri-Ax, Hurst chrome stick with black ball
<font size=-1>[ This Message was edited by: retromuscle on 2002-02-08 08:15 ]</font>
