NISSAN 240 SS

Please help me with info.
Heres my part list.

Lq4 w/ 13k miles. Cleeean, crosshatch still new
853 heads p&p ex to 1 3/4", deburred cast on intake
ls6 mani, 28.3lb inj's, rails, p&p dbc tb w/ wide open notch
1 3/4" custom hooker longtubes (240sx swap)
ls6 hyd. Roller lifters and trays

what is my piston:valve clearance for max lift/dur. With this setup? .040 cometic gaskets

what will my comp. Ratio be?

Im looking or good under the curve power with a peak of 400rwhp give or take a few.

Cam gurus please chime in. This car will have a t56 drivetrain.
I do not want agressive ramps on the lobes, i wanna be nice to my springs lol. But i do want a lopey cammed idle. Not barely running noise but a good lope, it will be y piped 3" full ex, no cat with a coast fab race muffler.

Thanks guys

LilJayV10

iTrader: (39)

I'm having a hard time figuring out exactly what you are wanting to know.

PTV clearance is typically .080(safe at .060 though) on the intake and .100 on the exhaust. (These are the measurements you want)

If you are running stock pistons the .040 gasket is probably going to be to thin. LS engines have negative deck height which means they stick out of the block some.

I actually had this exact conversation with Brian Tooley last night night. I'm trying to squeeze every little bit of extra power out of my setup. I'm running .051 gaskets on my car. I talked to him about going with a .045 or .040 gasket and he said he doesn't like doing that because there's a small chance the piston might smack the head. I know people have done it, but this is what he suggested for me so I'm going to listen.

If you are looking for a camshaft recommendation talk to Martin@Tick Performance, Geoff@EPS, Patrick G, Predator Z or Damian.

From my limited knowledge going off what your goals are I would say they will probably recommend something w/ 226-231 on the intake and 230-237 on the exhaust.

NISSAN 240 SS

Thanks, thats the measurement i was looking for on p to v clearance, but to make it easy on myself i wanted to know what max lift and duration is possible in my combo with .080in and.100ex p to v clearance, i guess now with an oem gasket. Im not trying to max it out, just wanna know where the max is so i can keep it dependable, as i am drifting the car and will be mostly in low to mid range power and on and off throttle constantly. I want plenty of "safe clearance".

Thanks again for the reply, im new on here and my las thread got no response, i appreciate it.

LilJayV10

iTrader: (39)

When you talk to whoever about your camshaft selection let them know you aren't wanting to flycut. They know pretty well which cams do and don't require fly cutting.

Martin from Tick performance is on this board a lot. I've talked to him several times and he is very helpful. He really enjoys what he does which helps even more.

batboy

iTrader: (6)

If you are looking for performance, I'd get 243 heads and ditch those 853 heads. The LQ4 has dished pistons and is already low compression. The 853 heads don't flow very good and the combustion chambers are fairly big compared to the 243 heads. You might also consider bigger injectors.

NISSAN 240 SS

I ported and polished the exhaust to 1 3/4" to match my headers, and deburred the casting on the intake side. haven't had em on a flow bench but I would say they should flow awesome now.... especially with a cam, my good buddy has the same work on his 853s with an MS3 cam and is making 422hp and 378ft-lbs at the wheels on a mustang dyno, its on a 5.7 ls1 too. so i figure with 18ci more and a half a point less compression i should be close to his numbers.

243's are too expensive. Im on a budget and have what I have. i keep hearing to run 317s milled but i also read of intake fitment issues. Im keepin it simple.

thanks for the input

Sales@Tick

iTrader: (3)

Dillon,

Have you decided if you're going to run the 243 heads or if you're planning on keeping the 317's and milling them slightly? Milling the 317's would be the cheaper option.

NISSAN 240 SS

I traded my 317 heads for other parts i need. I have a pair of 853 heads that are being ported and polished on the exhaust to match a the Header. i think 1 7/8" is the size im going with.

Does anyone know how far the 853's can be opened up? is 1 7/8" safe?