if you have the money to stroke it which it looks like you do. i'd go for it. I went heads and cam cuz money was tight. Now I wish i had just saved a lil more and stroked it.

 

Not Exactly.

To get 402/408 long block is something like $3000 more compared to 346 H/C.

The other point is, a 402/408 short block with 241 heads and current cam will be way below in HP compared to a H/C 346. Maybe torque will be better but high RPM performance will suffer.

I'm thinking, maybe a 346 H/C combo for now will allow me to just upgrade the bottom end to 402 or 408 in future using the same H/C from the 346.

My concern is, are the TFS215cc head and (240/244) Camshaft like for example Vindicator on a 346H/C setup going to work well with 402/408 later or an upgraded heads and cam will be needed?

So, basicaly are the TFS215cc and top end 346 camshaft going to be small for 402/408 short block when it's time to upgrade the bottom end later on?

 

my 347 cost $7500 by the time I finished with it. The final cost is never what you think it will be. 5000-5500 will get you a nice 408 or 402 with all the covers and a timing set and cam and oil pump and lifters but then you need other stuff like heads and an intake and how yours exaust? 1 7/8 lts for the big cubes and a 90/90. Why build a bottom end if your not going to complement it. If you dont complement it you will never get its potential out of it and have wasted your money on the bottm end.

Say a decent 408 or 402 is 4000-4500. Thats using callies and diamonds and good bearings as well as ARP's through out. You can get it cheaper but your getting cheaper rods. That doesnt include the timing set, lifters, cam, oil pump, or covers. Then you need heads. You can look for used heads and save money but your still going to be hard pressed to do a complete quality 402 or 408 longblock for $5500.

My 347 SB with timing set,oil pump, lifters and cam and ARP's everwhere was $4500. Then the heads were 1900. Intake and TB $1100. The I had to swap my LT's for some stepped Kooks. That another 1400 but I'm getting 600 for my old setup so its actually 800 for the new setup.

Its never what you think it will cost in the end. And that doesnt include tuning at 450+


With your budget I say a 347 with either PRC 2.5's or Patriot's 243 deal.
An ls6 intake will do but you'll want a 90/90 later. forgedabout da TFS heads

 

Interested to know if you dynoed your 402 with the AFR205S MILLED TO 59cc. COMP 244-248 .612-.615 113 +4.

Not sure if the 402/408 with stock 241 heads and a small cam will be even close to a top end 346 H/C combo.

Let me tell you my true goal, I'm shooting for 500RWHP with either 346 H/C or 402/408. I am sure both will get me there with all supporting mods and big bocket of $$$.

But here we go again, I am comparing 346 H/C and 402/408 short block (not 402/408 long block), due to budget constrains, off course. Otherwise, I will shoot two birds with one stone and get a 402 or 408 long block with Fast 90/90, simple as that.

 

Now you say your true goal is 500 rwhp. Make up your mind bitch. Its a whole different ball game for 500rwhp. That TFS Vengence cam combo is a max effort high dollar affair that takes all the planets lining up to achieve and you wont do it for $5500.

For 500 rwhp you want a 408 or 402 and good heads and 90/90 and 1 7/8's lts and you aint gonna do it for $5500. You also need to think about clutch and rear-end. You want dependable or a dyno queen that breaks when you hook?

Make a goal and stick with it. Saying you want this but really want that is bullshit. I'm outta this thread.

 

You do not need big cams to make 450rwhp.
AFR 205s, 59cc, .040 gasket and I'll spec you a cam.
But don't even think to try something with me because my finger is on the button and I'm ready to push that button (know what I mean?)

 

Don't be an *******.

I said goal is 450+RWHP and isn't 500RWHP the same as saying 450+RWHP.

It's slightly less than $5500 for parts; Heads, Cam, intake, TB, Injectors, RR and Rod bolts. Headers, transmission and rear end are already taken care of.

And please keep out of this thread little boy, no hard feelings remebmer you asked for it in your pointless post.

 

Well to be honst, I was looking at some of the top end 500RWHP 346 H/C packages and comparing cost of (parts only) to the cost of 402/408 short block.

No doubt in my mind that both, with supporting mods will trun the numbers. It's gonna be a NA race only engine not a DD, auto transmission.

I am trying to check if I will be good with 346 H/C that can allow me to upgrade just the bottom end, in future, to 402 or 408. Or, better to go with 402/408 shrot block using my 241 stock heads and my small cam until I can upgrade the heads and cam later on.

Thanks for offering to spec the cam for me.

If I decide to go with 346 H/C I will be trying one of the proven top end H/C package with port matched Fast 90/90. I will PM you if I decide to go with the option of specing a cam with AFR 205s, 59cc, .040 gasket.

 

Interesting post.

That's why I am thinking what's the point of a half *** job i.e. 402/408 short block with 241 stock heads and small cam and LS6 intake. On the other hand, a well designed top end 346 H/C package will be way better.

 

not yet as soon as i do ill post some numbers. i was on my way to do it like 5mks ago and 2hrs into my trip my ALT went out. i had to get towed all the way home GGRRR. only good thing was the tow truck driver played system of the down and drove like 80. he made better time thna my 500HP car did LOL

 

Hey guys, will ported LS1 heads flow enough on a 402 motor?

 

LS1 heads are good for stock or near stock cubic inch engines. Building larger engines and/or higher RPM setups, should start with 6.0, LS6, L92, Dart, Trick Flow, AFR or Edelbrock castings as most engine builders will recommend.

 

Ok so a pair of ported L92 heads would flow well on a 402, compared to the ported LS1 heads?

Also what do think of the comp cam 232/234 112, 595 lift? I've done a search but there weren't any threads on it. Would this cam suit the 402? And do you think with the heads/combo I mentioned, 450rwhp is achievable?

 

Get a custom cam from one of the sponsers to match your heads flow and you should be looking at 500+RWHP with 402.