241's milled
 

Is is possible/ worth the money to take factory 241's have them ported and milled to give a stock bottom end LS1 a 11:1 compression? If can that be done with out causing interfreance with piston with a 224/224 cam?

Or is the money worth spent buying aftermarket heads?

I would personally grab some 243's (LS2/LS6).

I did it had the over size valves done 2.02/1.60 and I am running 11.5 compression with no issues and I am flowing about 305@600 lift to include a port and polish and it all ran me $1560. Oh and the cam is a 232/238 600/600 and am shifting @6500. I am getting 3.42 gears cause I am running 3400 stall to 3.15 and after market 4L60E and I'll be shifting now about 6800 making about 440 with 3.42 out of an automatic keeping the same stall.

Tyring to make power on a bugdet. I think my cam is only like .581 of lift so it will be close to 02*C5. Putting the valves in needed?

I would definately say its possible with that cam, always best to check though. I have ported and milled 241 castings (so I could keep the factory casting number on them) but if I could do it all again I would just buy a set of ported and milled 243s very reasonably priced for all the machining that will have to be done to your factory 241 (valve job, inspection, cleaning, milling, etc

It was a package deal to include the cam the price was great if you want the info let me know the guy is a legend.

if you search on here, you will find very impressive numbers from folks running worked over 241's,,,,lots of folks just say 243's, and thats great if you've got a lot of money laying around,, but for the $ ,,, 241's are great when worked (they are not bad stock either when you look at it)

ported 241's (done correctly) can out flow 243's up to about .400 lift,,,, after that the 243's will flow more. Once 243's are ported, then obviously they will rule the world, but you will pay a price that may not be budget minded....although, they are becoming cheaper than they were just a year ago...

+++ Can't agree more The 241 castings are very underrated and once I go forced induction (ie blower or Turbo) then I'll go ported 243's but for now I am running N/A soon to add a bottle and with that compression I can still run up to 150 wet shot safely with no issues.

Up to .400 lift? So that basically means the money you pissed away on getting 241's all done up is a waste unless you not putting a different cam in it as well.

I would say if you go through the trouble of having your heads ported, polished and milled and do not add a cam then really you just pissed away money regardless 241's or 243's. My buddy has 243's I am at 305 and he is at 325 those 20cfm's haven't done a thing for him because in the 1/4 I beat him by .2 every time out and his set up is not that much different than mine except he is a stick and I am auto and he is pushing about 30hp more because he is stick.

You just made the point even stronger....if thats the case, wouldnt slappin on 243's be a much bigger waste if not adding a cam? By your logic,, I guess id rather waste 500 bux than 1500.

Your beating him either b/c his cam is different, the tune is off, or he isnt driving it the way it should be driven...not b/c your heads are better.

I bet his MPH is a lot higher (the car with 243's and a stick)...unless his car is a lot heavier.

I am lost I think this is getting off topic a bit. Can I get away with just milling the heads nothing else?

yes:chug:

OK do or anyone know how many thousands will have to come off to get me to 11:1?

I bet so too. 2 tenths is so little, just more gas in one car would make that difference.

OP, my 243's are milled to 62cc's and with a .045 gasket its 11:1. Im not sure how much needs to come off of 241's to get to 62cc's but the machine shop should be able to tell you that.

Sorry for screwing up your thread by the way.

That's the point I am trying to make. It is not heads 20 cfm's is not going to make a difference and he has a 2000 C5 with 4.10 and 232/234 596/603 110LSA w/P&P 243 and milled heads going through a 6 speed. I am at a 11.9@114 he I don't know exactly since it is not my concern with his times and a 1.8 60ft anything else you'd like to know. Oh that's on Nitto Invo II street tire and a 18/19 off set if I was doing a 17/18 drag radial and loading my stall I'd be around 1.7 if not 1.6 and breaking 11.5 or 11.6 with the set up I have. All N/A. Tune and set up that is what I am trying to say.

Can you get away with just milling the heads and nothing else your wasting you time and money. Save some cash and do it right. Head/Cam headers, intake, stall if auto 4.10 for a stick or 3.42 for an automatic daily driver. You can do 3.73's but your MPG's will suffer. a 3600 stall and a hell of a tune. That should be the way to go anything else and your really hurting more than helping. That is because it will come a time that because you milled the heads to run on a compression ratio for a stock cam then you'll either have to mill them again or get new ones if you go with a new cam. and so on.

Well I already have a intake and a cam. I don't see the reality in spending 1k plus on heads, to do the same thing as milling the heads and having a port job done.

Since your on a budget, than go ahead and sue your 241's. If you have the money and want the extra 20-40HP, than buy a used set of 243's.

With the .581 lift and the mild 224 duration, PTV clearance shouldnt be a problem.