View Full Version : possible engine mod
kcarfan
06-20-2006, 11:28 PM
i'm thinking about doing the following and would really appreciate any feedback!!
A full port, and polish of the intake, and exhaust runners. It includes a moderate reworking of the intake, and exhaust bowls. Valve guide profiling, gasket matching, and full crossover polishing (intake & exhaust).
The cost would be around $500.00.
vetruck
06-20-2006, 11:36 PM
i'm thinking about doing the following and would really appreciate any feedback!!
A full port, and polish of the intake, and exhaust runners. It includes a moderate reworking of the intake, and exhaust bowls. Valve guide profiling, gasket matching, and full crossover polishing (intake & exhaust).
The cost would be around $500.00.
I say go for it, with a tune CAI, and full exhaust. Thats a dang good price too, is that all labor included or will you be removing and replacing the heads yourself? Anything else like performance springs, or TB, and will you keep the compression the same?
02redhawk
06-21-2006, 06:44 AM
I wouldn't polish the intake runners.
Also you can get ported and assembled 243's from TSP or Livernois for ~$900, no core.... Great sets of heads from reputable shops for about the same price (after you sell your stock 243s).
kcarfan
06-21-2006, 07:56 AM
I say go for it, with a tune CAI, and full exhaust. Thats a dang good price too, is that all labor included or will you be removing and replacing the heads yourself? Anything else like performance springs, or TB, and will you keep the compression the same?
i haven't decided to do anything else like performance springs, compression, etc. the cost includes labor and it's from a reputable local speedshop.
just looking for comments on both sides before i decide what to do.
TonyGXP
06-21-2006, 01:46 PM
Dyno before and After...only true way to tell..ask the speed shop to give an estimate..in writing about HP/TQ gains..if they say 25-30 and they choose the dyno facility shouldn't be an issue if they're reputable..my point is if the truck doesn't make more than 5hp to the wheels it's just not even worth it..I would assume the gains would be throughout the rpm range as well, which would be nice..
kcarfan
06-21-2006, 05:28 PM
i asked them for before and after dyno charts on other vehicles they've done. the owner wasn't there but i was told he would give them to me and that they've done a number of ls2 vettes with excellent results. the problem with my vehicles is its an awd and there isn't a 4wd dyno around here. btw - my parents live in toms river.
PowerKraus
06-21-2006, 06:30 PM
i'm thinking about doing the following and would really appreciate any feedback!!
A full port, and polish of the intake, and exhaust runners. It includes a moderate reworking of the intake, and exhaust bowls. Valve guide profiling, gasket matching, and full crossover polishing (intake & exhaust).
The cost would be around $500.00.
Is your purpose to get more air into the motor? Make sure this mod is part of a plan, and not just something that sounds good to you....Honestly, I would do this if I had a modified motor. On a stock motor in a heavy truck the shape of a brick....I would spend money elsewhere, especially if finding a 4wd dyno may pose a problem (to verify gains). Also, to get the most out of this, make sure you have the right tune. I see tonygxp has responded.....if I were you I would do a more indepth conversation with him and his opinion.
Yes, it sounds cool, and with labor, the 500 price is right. But I would make a wager that on a relatively stock truck you'll see maybe 5 HP and possibly a loss of torque down low.
I've been doing this 20 years....so this is just one guys opinion.....take it as that and not gospel. My point is, $500.00 is not alot, nor is that chump change, so do more research. And make sure whatever stats you are told are truly comparing apples to apples, and not something on a race motor application...where there is a good gain to be had from this mod.
Goodluck and enjoy !
Rob
Viper GTS
Grand National
C5 Stroker
TBSS tow buggy
E55 sleeper
vetruck
06-21-2006, 07:02 PM
Yes this is what I was getting at. This mod usually requires that you eliminate the other restrictions first. ie. CAI, exhaust etc. Also a cam would be a nice compliment and some stronger spings for higher revving.
04TBEXT
06-21-2006, 07:07 PM
I would tend to agree with PowerKraus and TonyGXP. Altering intake flow to the cylinder(s) might require changing a multitude of engine parameters to receive the full benefit of the cylinder head modifications (camshaft profile changes, possibly ignition timing events, etc, etc). There are other members on this forum that know an abundance more than I do who may jump in on this...I've been down this road in my earlier years and found that it wasn't one, but the right combination of certain modifications that make ultimate power.
According to the tuners, it seems that GM is somewhat conservative with their engine control parameters..I read positive results from alot of SS owners in this area...maybe an area to investigate?
I agree that some research from others may net the results your looking for...I think you'll find that once you make this cylinder head modification, you'll need to make modification #2 , then #3, etc, to gain the benefits from the previous modification and then, where does it end?
Just food for thought...
Whatever you choose, good luck and keep us posted with the results.
kcarfan
06-21-2006, 09:45 PM
i reallly appreciate the input from everyone. my plan may or may not be right but i intend to make mods incrementally and this may not be the right next step in the process. ultimnatley, if and when someone comes out with a supercharger, i'll get it. i also want a cam but haven't seen or heard anything yet that looks like the right option. of course, i'll buy vectors headers when they're ready. and i'm still investigating drivetrain mods to handle the extra power. in the end, i'd like rwhp of between 500-600hp.
keep the thoughts coming and many thanks!!
vetruck
06-21-2006, 11:40 PM
I would tend to agree with PowerKraus and TonyGXP. Altering intake flow to the cylinder(s) might require changing a multitude of engine parameters to receive the full benefit of the cylinder head modifications (camshaft profile changes, possibly ignition timing events, etc, etc). There are other members on this forum that know an abundance more than I do who may jump in on this...I've been down this road in my earlier years and found that it wasn't one, but the right combination of certain modifications that make ultimate power.
According to the tuners, it seems that GM is somewhat conservative with their engine control parameters..I read positive results from alot of SS owners in this area...maybe an area to investigate?
I agree that some research from others may net the results your looking for...I think you'll find that once you make this cylinder head modification, you'll need to make modification #2 , then #3, etc, to gain the benefits from the previous modification and then, where does it end?
Just food for thought...
Whatever you choose, good luck and keep us posted with the results.
Hmm, I think there is an echo in here :)???
04TBEXT
06-22-2006, 01:49 PM
vetruck,
I started typing my post after reading Powerkraus' response. As you can see, my response is rather long-winded and yours is rather short. Plus, I toggle back & forth from forum, to work, etc. After writing and correcting, I submitted my post, but found you beat me to the response. Nevertheless, great minds think alike...:woot:
vetruck
06-22-2006, 03:28 PM
vetruck,
I started typing my post after reading Powerkraus' response. As you can see, my response is rather long-winded and yours is rather short. Plus, I toggle back & forth from forum, to work, etc. After writing and correcting, I submitted my post, but found you beat me to the response. Nevertheless, great minds think alike...:woot:
Lol, I figured that and I was J/K, hence the smiley :)