Rick364ls

iTrader: (1)

i did some searching found nothing specific. late 04 lq4 has the full floater rods. not that that is relevant. does anyone know the piston to valve clearance on a set of untouched 317s with the ms4 cam I have not ordered the cam yet and I have not because I am trying to get an idea on how much I can mill them to try and get an idea on pushrod length. I know I can get 243s decent but I am considering down the road a set of the 2.5 53 heads just wanting this for the summer. i would like a little more compression for this cam I have a 95 mustang GT 4:10 gears th400 with a brake and a 8" tci 5500 converter I dont care about street manners or any of that crap I can drive my 88 chevy truck for that. now that I have covered most of the what I can or should do someone please give some insight
Thanks Rick

Samer

Hi Rick,

I think that big cams (like the MS4) need high compression to perform. With the stock compression of the LQ4 (9.4:1), you won't be making a great setup going for the MS4. Even if you milled your heads to 67cc which is the same chamber size of stock LS1 heads (no PTV issues), your compression will still be 10:1 only.

However, if you don't care about drivability, just go for it man !!

mark21742

Like Samer said, is mill the hell out of the 317s to make that cam perform the way it should and plan on fly cutting the pistons ( you'll need to fly cut them anyway for the 53 heads) try and get your scr up to around 11:1-11.5:1

dodson55

iTrader: (18)

onless you mill the heads a great deal you should have no problems with ptv clearance remember that a lq4 has a .050 dish that gives you more clearance

Sales4@Texas-Speed

iTrader: (4)

I would be very wary of milling the heads too much. The MS4 is the largest cam we offer for these motors and I don't think there would be enough clearance to significantly mill the heads without issues. I would dump the 317 heads and grab some 243's if its in the budget. They will achieve the desired compression without giving up any piston to valve clearance.

Rick364ls

iTrader: (1)

thanks for the reply guys. texas speed guys this car will be street car but dont care about how it drives. what you you recomend for the carbed single plane intake as far as the cam selection. I only want to buy one cam even for fututure upgrade ie heads pistons rods ya know the goodies. car will see the weekend track time . hopefully this winter building it up just trying to get it together for this summer. even if the power is a little sluggish it has a 5500 8" converter to get it up top thanks in advance Rick

Rick364ls

iTrader: (1)

or I could just throw in my vortec headed 355 sbc but what fun would that be? I think the lq4 will stomp all over it either way

mark21742

But the dish is on the middle of the piston and the valves are to each side of the center

Sales2@Texas-speed

iTrader: (5)

Precisely...you aren't in the clear because of the dish...the outside edge is still up near the deck's height and will cause interference issues!

Rick364ls

iTrader: (1)

this is why I was just going to order the cam and check ptv first before the mill so I knew what there was to deal with. or if someone thinks a smaller lift cam would fit the bill as well

mark21742

Your PTV clearance is more determined by duration than lift

Rick364ls

iTrader: (1)

thanks for the input mark. somewhere in this head I should have known that. I own my own auto repair garage just never really got into lsx engines till now not that any engine cant have this problem I remember degreeing my dads 540 BBC a little retarded I think to gain some clearence. guess ill just get the ole cam and check it. thanks every one for your insight on the matter. ill be giving tsp a call soon

mark21742

Lol just remember we are making more power easier with these engine because the clearances ate tighter and tolerances are closer

Rick364ls

iTrader: (1)

and for what it is worth. just trying to beat my friends procharged 94 f body bone stock lt1 with procharger and bolt ons

garygnu

mill the 317s and contact patrick-g for a cam and guildence for a great street killer NA.

Cosmos

iTrader: (15)

I read that and thought of the guilds in Elder Scrolls lol.

A friend of mine has a Lq4. He has stock long block, (317s unmilled) and a Torquer V2 cam. Everything fit without flycutting. Runs pretty good. Made 400 rwhp on a N20 tune. Ls6 intake, ebay exhaust. Good combo if you dont wanna worry about PTV.

jlee29

iTrader: (5)

If this helps, I just installed this combo last week. LQ4 with MS4, and 243/799 heads only resurfaced .005" and Fel-pro stock thickness gasket. PTV was damn close, but it works and sounds/runs incredible! No dyno numbers yet.

Rick364ls

iTrader: (1)

do you remember what the clearence was on that. thanks Rick

jlee29

iTrader: (5)

I didn't use a caliper to measure, just the clay method and it cleared. I'll say it was very close but I was comfortable with it. I spoke with Texas speed and they suggested to not mill more than .003"-.005"at the most to clean the head surface. Without reliefs.. and still suggested measuring, and possibly degreeing the cam to ensure the valve event is at the intended time. I just installed it dot to dot and went with it...

Damian

iTrader: (89)

A low compression iron block with a camshaft that size is going to be a slow, TQ'less turd. End of story. To achieve any type of compression you'd have to have a set of heads worked, valves sunk it, etc to make sure you didn't have PTV issues.

Have a camshaft in the high 220's/low 230's cut to match your combo. Picking the biggest cam you can find on the internet and basing your decision around the amount of marketing hype it gets isn't the best way to go about building an engine.

Huge cams like that need lots of compression, and cubic inches to work properly.