what size cam is too BIG
01-31-2009, 03:26 PM
#1
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what size cam is too BIG I have a lt4 hotcam with stock bottom end and need some help.I am getting my heads ported,so i have a few ?'s The porter said he can make then flow about 280 or 290 so what kind of hp will i be looking at with the same setup with lt4 ported heads?If i change my cam what will be safe to use? trying to save some money?
02-01-2009, 09:12 AM
#9
Comes down to the rpms the shortblock will handle. Some of these guys are suggesting cams that need to spin too high.
The peak flow numbers are not that meaningful and I would not even consider ported LT4s.
You want to go simple proven and rpms inside the stock shortblock's(assumption) rpm capacity look at the Comp 503.
The peak flow numbers are not that meaningful and I would not even consider ported LT4s.
You want to go simple proven and rpms inside the stock shortblock's(assumption) rpm capacity look at the Comp 503.
02-01-2009, 11:51 AM
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so your saying don't even waist my time porting the heads?the on;y thing is im wanting more hp,so would you guys port the heads for like 600,and intake for 200. or just go get a better,bigger cam?
02-01-2009, 12:13 PM
#11
No I am saying peak flow numbers while often quoted are not a real indicator of a head's potential. Those are some big numbers to get for so little money and I would be surprised if they actually work well, there is something wrong there either shortcuts to get price down or inflated numbers to convince you to buy.
Ported stock heads can be a GREAT mod if they are done by the right folks, as with everything there are a lot more folks offering this service than those who actually know what they are doing.
IMO LT4 heads are NOT worthy of the belief folks have in them, the valves are nice, but that is about the only good thing I will say about them. I look at results though so my opinions vary sharply from the popular opinions.
Ported stock heads can be a GREAT mod if they are done by the right folks, as with everything there are a lot more folks offering this service than those who actually know what they are doing.
IMO LT4 heads are NOT worthy of the belief folks have in them, the valves are nice, but that is about the only good thing I will say about them. I look at results though so my opinions vary sharply from the popular opinions.
02-01-2009, 12:50 PM
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i have heard of the guy doing the porting,and i know the tuner that tunes the cars once they have been done and they are doing good with good #'s do u think i will see a big increase in hp,will it help alot? if i keep the same cam?how much hp gain will i see in your guys opinion?
02-01-2009, 05:45 PM
#13
If you have the hotcam and want to keep it the ported heads will put you between 350-380rwhp depending on other mods and auto or manual! What people are trying to say is to get your money worth from the heads it would be better to do a bigger cam with them but most say not to twist the stock bottom end past 6500 so you dont want to do to big of a cam. Think about what you want to do in the future if a stroker is in mind I would set your self up for it do the heads keep the cam you have and do the bigger one when you do the motor. If you want to stay heads and cam then you may want to do a custom cam to squeeze every bit of power out of the combo you have!
02-01-2009, 07:21 PM
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i have a rebuilt bottom end and it's spinning to like 6800 now and no problems.and its an auto,with all the right stuff hooker longtubes,rebuilt tranny,borla and lt4 intake.it has 336 rwhp now
