Cam specs for N/A 418?
 

Parts ordered and (hopefully) shipped for 418 build (TSP LS3 4.080 block and forged Callies/Comp star rotating assembly). Heads will be CNC ported to match a Fast 102 and Nick W 102 TB. Cam spec being considered is 235/250 .642/.642 114 lsa. This was based off a build producing 626 rwhp @ 6400 / 583 Tq @ 5300. There's a lot of knowledgeable folks on here...any recommendation? Cam specs?

That's a massive cam. You might want to run your G6X3. At least at first.

In all honesty I'm very gun shy about touching the G6X3 cam again. After 2 engines failures with it i'm not comfortable going that route again. I admit the failures could be attributed to builder/installer issues but i'm leery.

With the extra cubes your new build will have, that cam should feel a lot like the G6X3 did in the LS3. Is that cam what TSP is recommending?

The cam specs come from a build write up on LME's 418 producing the numbers posted.

Damn, 418ci. Jealous man, that sure is a monster cam though! keep us updated on the build? :D

Those are impressive numbers. What compression ratio are you going with? I'm sure some of the experts will chime in soon. I can tell you I too broke a LS3 with a G6X3, and when you get your stroked engine you are going to be so much happier with the low end torque you will wish you swapped earlier.

Planning on 11.7:1 CR. Hope to dial in A/F at 12.6:1.

Your short block plan is very good. With that cam I would say make sure you have a similar plan for your lifters, valve springs, pushrods, rockers, and valve train geometry and you should end up with a killer engine.

Lifters will be LS7 (yes...same darn thing as LS3...) unless builder thinks going to something more stout would be in order, however the LME build specs used LS7s to no ill effect. Dual springs...though need to make sure they'll support 170 lbs seat pressure and 430 lbs of open pressure...and getting trunion upgrade to be smart.

I say go with this cam
http://www.compcams.com/Company/CC/c...csid=1415&sb=0

My dumb azz should of done it! I kick my self in the azz I ended up with the one in my sig.
On a dynojet I would of been close to 600hp thru a heavy 4.11 geared 9" and a spool and driveshaft. My stroker sucked that cam right up!

As far a springs, get the Brian Tooley platinum springs, if you want to keep the lifter trays (which I'd advise not to) get the BTR SLR lifters which is an ipgrade to the GM Ls7 lifters if not then get some linkbar lifters like morel or lunati they are the same ones and avoid a lifter turning on you. I'd also recommend a set of BTR 3/8 pushrods which are thicker and not at all more expensive than the 5/16 ones. NOTE since the heads are off they will need just a bit of clearancing and most porters do this anyways but let then know you'll be running them.

Just my .2

430 is ALOT of open pressure, that's why I decided to go linkbar lifters. And I have nothing to worry about.

I edited post 11 sorry.

Ok researching linkbar lifters...and reviewing the linked cam specs, excellent suggestions!

Little any dynos of that cam in a stroker, the one you linked?

Yes sir I do, luckily I still have all my links from when I was doing my research and back and forth with Gabe over at comp cam's who is one helpful guy over there. BUT I got light in the loafers when it came down to pulling the trigger on the cam lol. SHOULD OF GONE BIGGER! I was happy for about 2 weeks lol.

http://ls1tech.com/forums/dynamomete...sults-vid.html

GMHTP also used this cam in a 3 part series on a 408
http://www.gmhightechperformance.com...t/viewall.html

From YB
http://www.yellowbullet.com/forum/sh...=337998&page=2


This setup is the best!!
http://www.pro-touring.com/showthrea...-boring/page43

http://www.lunatipower.com/Product.aspx?id=2533 is it these right here? im going for a similar build thats why i ask only difference in mine would be my setup would only be 10:1 cr to compliment a whipple later on down the road.

congrats on the 418. cant wait to see how you like it.

curious as to why you would get a low end torquey motor then a cam that will move the band up.

i hope you upgrade the valvetrain as much as you did the block. plan plan research plan plan research.

yup thats the only way to do it!!

That cam has less overlap than a G6X3 and the extra 42 cubes will soak up more duration. What are your goals exactly? RPM range and exhaust system too?

I'm trying to get as much tolerable grunt in a broad range given the SS is both my DD and weekend track car. I've never had a good feel for the G6 cam since the car was never set up right to begin with.

I won't skimp on valvetrain since I'd rather not go through builds as a habit. Look.

Strokers will make the torque throughout the band regardless. I'm sure it's going to have 500ft lbs by 3600-4000 with the bigger cam.

that cam is close to the intake lift of the g6, but the exhaust is way bigger and 111 to 114. i like the cam litle88 posted. ive been thinking of a stroker for a while started to do it last winter but then decided i wanted a vette now back to thinking a stroker.

I'm with Little88 on this one. That stroker is going to handle more duration without getting unruly. The cam you have chosen is by no means large for that cube motor and I definitely agree that 430lbs of open pressure is excessive.

Depending on what your goals are: RPM, where you want the power, avg. HP etc. You should not have any issues making the numbers you quoted and even more if you use some different heads/larger cam.