arliejr08

I'm building a 418 stroker motor, and can't decide on best heads and cam to run, I plan on runnin 150 to 250 nitrous system, any suggestions? Thanks

87silverbullet

iTrader: (11)

How deep are your pockets? That is the question.

You can use pretty much any cathedral head you want on that motor. AFR 230's would be a good choice on this.

As far as rectangular port there is a slew of them. You can run and LS3 head or the aftermarket LS3's from MAST or PRC. You can also run a small bore LS7 setup like the PRC small bore LS7 heads or the RHS LS7 heads.

If I didn't have the heads or intake yet I would go LS7.

As far as cam, I would contact Geoff@EPS or PatG on here to custom spec you something. It's barely much more than an off the shelf cam.

arliejr08

Cool thanks, ya I haven't got the heads or intake yet but I was wanting to run a fast 102

87silverbullet

iTrader: (11)

There is a 102 for the LS7 heads.

The thing about it is that the stock LS7 intake breathes very well for an LS7 which is more cubes and can be had for half the price of a Fast 102.

I would just get an LS7 and maybe get it ported.

arliejr08

Thanks for the help ill probably go that route with a port job and run afrs hopefully

87silverbullet

iTrader: (11)

If you run AFR's then you are going to want to get a FAST intake because there is no factory cathedral intake that is going to flow the air for a 418.

The good thing about AFR's is that you can run the stock valvetrain unlike Trickflows because of the different valve guides.

arliejr08

The prc heads r u talkin about the 265cc or the 285cc would be best?

87silverbullet

iTrader: (11)

You are going to want to use the 265 heads because the 285's need a minumum of a 4.125 bore and you only have a 4.080 bore

arliejr08

Ok thanks for the info

Sales4@Texas-Speed

iTrader: (4)

I would definitely recommend taking a look at our PRC LS7 small bore heads. They will fit on top of that motor and I would expect them to make some pretty good power. One of our customers recently put these heads on top of a 429 LS3 race motor. While it did have higher compression he was able to get 604 at the tire through a 4l80E transmission. While this is not the same as your setup it gives you an idea what these are capable of.

batboy

iTrader: (6)

If you decide to stay with cathedral ports, you might want to consider Trick Flow 235 heads.

arliejr08

Thanks for the info guys its helping alot

87silverbullet

iTrader: (11)

Trickflow heads are badass, no doubt, but they have an added expense in having to use a roller rocker. So, if you spend that much money on a set of heads, you are not going to cheap out on some garbage rockers.

So in the end add a minumum of 500 bucks to the price of the heads.

Any other head can run the stock rockers of aftermarkets if you choose.

batboy

iTrader: (6)

Trick Flow indeed recommends aftermarket roller rockers, but lots of folks are running stock rockers, usually with trunion upgrades. You need to shim the rockers though to get the geometry right. TEA has a kit with everything you need including the right length pushrods. Thunder Racing sells these kits.

DaFireMan

iTrader: (5)

The trunion upgrade isnt needed but very helpful. But with the price of the kit to shim for stock rockers, trunion upgrade, and labor you may as well just buy aftermarket rocker kit! Im not saying to get a $1000 dollar set of Jesels or T&D's but for all those parts above and labor would probably equal out to a set of $500 dollar yella terras or harland sharps!

DONT GO CHEAP ON VALVETRAIN COMPONENTS!!!!

DaFireMan

iTrader: (5)

O yea back on topic(LOL, sorry OP) I would do the TFS 235 and a matched cam!

pharmd

iTrader: (4)

Call Phil @ AI, tell him your build, what its designed purpose is (dedicated track car, street/strip etc), how many miles a year you plan on driving it.....and he will hook you up with a knockout setup. I've run AI heads on 3 different motors, and all of them have run as well or better than other similar cube motors, running ANY other head combo. Don't get into chasing dyno #'s or flow #'s...

arliejr08

Thanks for the help guys. Its helped me out alot

87silverbullet

iTrader: (11)

I still vote for the LS7 heads. You have a better valve angle and a port that can move some serious air and have good port velocity doing it.

6D9 Matt

Agreed... heard good things about these. Going to consider them later this year when I hope to pick up a stroked LS3. Might look into a Pat G spec'd cam as well.