ty_ty13

iTrader: (42)

does any one have a set of 225s or 245's on the shelf?

and is it just me or doesn anyone else think that a 245 intake runner is too big for a 408?

dyno numbers dont always tell the story....
from what i've seen and done a smaller runner makes better times at a track...

what do you guys think?

dame

iTrader: (3)

a 245 on the shelf?

maybe you haven't seen this thread:
https://ls1tech.com/forums/removed-locked-thread-graveyard/439780-who-else-waiting-their-et-heads.html

as far as the size of the runner... I would think that a 255 would probably be too big of a runner for a 408.... im HOPING that I made the right head decision going with a 240 (245- whatever they decide to call it his week!)
I went with a smallish cam (234/238 113 lSA) so im hoping to have some sort of drivability.

ty_ty13

iTrader: (42)

the reason i ask if these are on the shelf is because they keep letting more and more people become a vendor... that doesnt make sense to me if they cant keep up now.

dame

iTrader: (3)

<--- Positive thoughts, positive thoughts, positive thoughts

Phil99vette

iTrader: (11)

Considering that almost every cylinder head on the market BEFORE AFR and ET got onboard had intake runners over 230cc's, 240s seem right in the same range but with much higher flow numbers. One thing that everone seems to forget is the port is not the same length. With the valves rolled over 4 degrees, in my eyes it is easy where you can add 10cc's to a longer runner. I would go with 255s on a 408.
Phil

dame

iTrader: (3)

interesting.....would you stand behind that comment on a 408 with a 234/238 113 LSA cam (with a 200 shot when at the track)


I'd like to hear your opinion on this if you dont mind....... I actually thought that a 255 was TOO big for a "street" 408 (I mentioned "street" because the size of my cam)

gollum

iTrader: (1)

The 245's are not too big for the 408. It is our restrictive plastic intakes (90mm FAST included) which they are too big for. Our plastic intakes SIMPLY WILL NOT let these heads breath to their full potential. Sorry

beardWS6

iTrader: (1)

I have 245`s on my new 408. After the restall and new cam in I can tell you what I get! Love the heads. Sweet. Just don`t like having to figure out the pushrod lengths.

Demon SS

iTrader: (3)

a bit off topic
why are you going this small in a 408? I would go with at least a 242-248 112las in a 408, it would still be driveable/streetable. I would suggest some more research on your cam choice just my .02

the 245 runner heads are great for the 408's but you could go a little bigger for the reasons stated.
ET has a number of different options which can cause some lead time issues, from time to time
also due to the number of different options, finding anything other than the 215's and 225's on the shelf probably won't happen

408WS6

iTrader: (1)

I think that the real advantage of the 245s will come into play on nitrous (like direct port) or forced induction motors when those large ports will better allow the engine to breath. Otherwise, as someone pointed out earlier, the intake will be the limiting factor.

ty_ty13

iTrader: (42)

mine will be a gmpp single plane with a 750hp carb on top...

so you guys think the 255's would be nice with a 250ish duration and about a .700ish lift?

this will be a solid roller and have a large shot of nitrous on it... 400ish

gollum

iTrader: (1)

Damn! Your combo sounds more interesting now.

gollum

iTrader: (1)

Edelbrock makes a similar intake. You could call them or ETPerformance for a setup recommendation.

dame

iTrader: (3)

thank you for your input.... I actually did alot of research- I have seen just about every 402/408 on this board..... I even started a thread asking for 402/408 owners to post up how small there cam was.

reason I went with something this small: tired of the lope.... I want 500rwhp with the smallest cam possible, I wanted EXCELLENT street manners, I mean I want this thing to idle as close to stock as possible......... am I going to get that? (along with my 500rwhp goal) I hope so..... but if I dont- I know that im a simple cam swap away... (maybe a tad more duration, and maybe on a 115) What I do know is that I wont be "under headed" needing a 250ish cam to make decent hp because I dont have enough head. (I hope im making sense)

dame

iTrader: (3)

THIS is what im hoping.

gollum

iTrader: (1)

I think you made a wise cam decision, especilly if your using your quiet running OEM 3.42 gears.

Phil99vette

iTrader: (11)

I definitely don't think 255s are too small. In the past most of the ported LSx heads peaked in the low 3s for flow with runners ranging from 230-250cc, sure you want the same flow out of a smaller port if you can get it. Now the 255s flow like what 255s should.
Phil

dame

iTrader: (3)

Phil..... did you mean to say you dont think 255's are too big for a 408?

How about in my 408?

Phil99vette

iTrader: (11)

LOL yeah, I would go with the 255s.
Phil

kumar75150