ksk1980

iTrader: (33)

I've got a few questions about milling the stock heads. The only reason im thinking of using these is my buddy at a local shop will port them pretty cheap . I'm going w/ dual spring kit . my ? is how much can i mill the stock 241 heads using a MS-3 or a MS-4 cam w/o running into ptv clearance issues. I want to be able to drop this cam in line the dots up , bolt the heads on and be done w/ it . using an off the shelf cam like this everything should be right on . right ? have any of you guys run into any issues w/ the timing being off with either of these 2 cams ?

jshelton2006

iTrader: (15)

i'm not sure about the ms3, but with the ms4 you aren't gonna want to mill any without flycutting. it doesnt have too much ptv clearance on stock heads and gasket, let alone with milling...id say the ms3 would be fine because of less lift and duration but id let somebody else answer that bc im not too sure...

ksk1980

iTrader: (33)

or could i possibly see higher #'s using a diff. cam and milling the heads some to drop chamber size for higher c.r.

ERIK@MASPORT

iTrader: (32)

Many here will preach the fact that no two motors are alike and that you should ALWAYS ALWAYS ALWAYS measure after you install a new cam and a set of heads, milled or not.

I know that MS3s and MS4s were designed to fit stock heads. I would say milling heads would really cut it close, which opens the door to PTV problems.

FWIW, I run 5.3L heads unmilled and they clear my MS3 by a red **** hair...the plus side to this set up is it does raise compression slightly and I did not have to mill **** thanks to ~62 cc combustion chambers

I would recommend you measure with clay or degree wheel and gauge. Otherwise, you are leaving the fate of your pistons in the hands of those whom you have never met

Erik

ERIK@MASPORT

iTrader: (32)

PS- you want a nice street car and keep it budget??

Keep your stock 241 heads, have your bud port em if he wants to do it for nothing (which is cool). Throw some dual springs on there and run something in the high 220's or low-mid 230's. I run an MS3 cam like I mentioned above and I really have to rev the **** out of her to feel that cam do its thing. Granted I race a lot and also plan on running a dual stage of nitrous, so the MS3 will eventually make sense lol.

Otherwise, I have a 228/232 on a 110+2 in the shop if I ever choose to build a street car with gobs of torque. The cam I mentioned is a popular grind that many here will atest to.

It all depends what you want to spend. Dollar for dollar, ported 241's and a decent cam make for a FUN, FAST, and powerful F bod!! Oh yeah, don't forget pushrods!!

Erik

miller456

iTrader: (36)

If you want things that easy then dont touch the heads just swap the cam u should have no issues with ptv clearance with stock heads.

ksk1980

iTrader: (33)

the reason im changing heads is my left side heads is pouring water and i bought the set im porting from another member w/ 38,000 miles on them so im going w/ a spring kit w/ seals and etc. . im also going w/ a set of hrdnd PR's . this set up is for a street car but i pretty much drive the **** out of it 75% of the time. though i dont drive it all the time maybe 40 miles a week never more than 150 miles a wk. cars m6 w/ 4.10's. i just want to use these heads cause I'll have less in them all said and done than what i could get a set of stock LS6 heads from a sponsor. a smaller cam would make sense in a daily driver but why go smaller if the only time i need high HP is when im running someone (ie. running the ***** out of it ). i was thinking something along the lines of the ms-3 would be a good choice over the ms-4 where as i wouldnt have to rev quite so high. but any suggestions are greatly appreciated.

ERIK@MASPORT

iTrader: (32)

In all actuality, the MS4 seems to have a better profile for the street than the 3 does.

Hell, if ya got the 4.10s and a 6 speed, by all means get the MS3, just get ready for power @ 7200 RPMS Not sure how I know that lolol

FWIW, port heads, NO mill, run MS3- youll love it specially with 4.10s, I miss mine.

ksk1980

iTrader: (33)

oh yeah the motor has 115,000 on the clock thats why i wanna get by as cheap as possible but have a decent performer. that way if she pops i havent lost much. i also dont want to go to small on a cam install it and wish i had gone bigger. i expect alot

miller456

iTrader: (36)

Doesnt the ms4 pick up better tq gains than ms3?

ERIK@MASPORT

iTrader: (32)

Miller: that is what TSP claims. We have not tuned that cam or installed it as of now, so we cannot personally atest to the claims. I believe that was in the intention of the MS4 though with its design. Perhaps TSP will chime in!

ERIK@MASPORT

iTrader: (32)

That is not a TON of miles, but it is up there. In other words, it is not fresh

I would go with something that makes power all day long and will allow your motor to live longer than if you rev the **** out of it.

Everyone is always afarid that they will want to go larger. After driving and working on the cars that I have, I would say that the majority of the mid sized cams OUT PERFORM the "larger" cams 9 out of 10 times on the street.

Like I said, MS3s are sick with nitrous, especially at the track. Be realistic, how often are you going to rev to 6800-7000 on the street?

ERIK@MASPORT

iTrader: (32)

Read this thread:

https://ls1tech.com/forums/showthrea...460&highlight=

Aside from the N20, his car is similar to yours and he has STOCK heads to boot! He made SICK power before the nitrous, and I swear the car was and is a blast to drive on or off the juice...something to think about man...he runs a mid 23x cam.

And oh yeah, he is over 100,000!

ksk1980

iTrader: (33)

well car is set up w/ full bolt on ,lowered ported TB/ t/b bypass,4.10,whisper lid,pacesetter LT"sw/ory,3" cutout,3poit SFC's,adj.PHB & LCA'sw/ lowering brackets,cenerforce DF & flywheel, and will be portmatching my ls6 intake to heads and TB at time of install. and also will be installing 150 shot plate system. with the cam u mentioned above ERIC will i be able to mill any to reduce CC size to pick up a lil more. and also w/ that cam would it be better to try and keep the porting of the intake runners to a minimal or hog'em out to let'er breath

ksk1980

iTrader: (33)

after talking w/ Eric a lil more about the street characteristics of the ms 3-4 I've decided on going w/ a lil more streetable cam but I still want the chopy idle. Any other suggestions on a street / strip cam w/ proven decent #'s across the board atleast 410ish and up in the HP curve

1slow98Z28

iTrader: (3)

im in the same boat as you wanting the MS3 but i was thinking about the TRAK cam with a 4000 stall

LS1SS01

Im in the market for a cam now as well and i was also looking at a ms3-4. After reading this and a few other threads i have decided to look at a smaller cam since i hardly ever go to the track, its more of a weekend warrior. Im located in Wellington so I'd deff like to talk to Erik at masport for advice and tuning info.