moot

Ok,i'm going to buy some new sbc heads in the next week for my engine.so far the short list is:

racer pros
pro topline/proaction
dart iron eagle
brodix track 1


i'm not overly worried if there alloy or not as the difference would be bugger all on a street engine (which this is)

what intake port cc's would suit a 600-650 hp 392 ci engine.i'm thinking around the 220cc range. dunno if 230cc would be to big.

remembering that it is a reasonable budget engine,i cant go to stupid

allports

We have 235cc on a 355 in the altered. Isnt it a blower engine?

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moot

nah no blower,hilborn manifold converted to efi

birdy

Did you consider AFRs?

Check out this link:

210cc Small Block Chevy: Aluminum cylinder head manufacturing and flow dynamics

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allports

Ok nice how big are the throttles? Would you like a tune up for it?

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
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moot

there 2 and 7/16". the manifold is actually the magnesium version.not the alloy one were drilling it for efi injectors.

can you tune efi. probably looking at haltech.

Crunchy_NuT

that is sexy pipes

my two cents worth are i got dart heads on my ls1, bloody impressed and will be sticking with dart heads on the next engine i fiddle with

gas 84k

Check your mail moot.

allports

Not haltech only GM's. I could see it was a mag. Big throtles for a streeter lucky your going efi! Whats the bore and stroke? 4.03/3.85 how many rpm you gonna turn it

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

moot

if you can tune a delco,i'll happily use one of them.

haven't quite decided of the final engine specs yet.budget wouldn't allow for an after market block,so i'm stuck with a 4" bore.and there is no price difference between 3.750 and 3.850 cranks....

but so far we sort of nutted out 11.5:1 comp,racer pros (or similar) decent solid roller.some where around 630hp ish. so it'll probably turn to just over 7k.

will spray it later

allports

Be careful with the throttle size as with your specs you've only got 204ft/sec @ 7000 rpm which is a fair bit lower than you should have. You may need to sleeve it above the blades or sleeve the ram tubes at least. I've been there done it and had to do that! Racers are a good head, Id prefer to use Paul Wilson's stuff than any US stuff. delco's are very comprehensive, you 'll never get an aftermarket with as much tunabilty unless you go motec (go $5000 for an efi computer?) If you go delco get a VR or VS not VN VP

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

moot

i don't mind turning it harder.i was originally thinking it'll be an 8k screamer. my only real limitation is that I'd prefer that it runs on pump for street duties.so i was even thinking of 2 different tunes (pump for the street and 105 at the track).

driveability,economy,noise etc. don't concern me at all.

can you tune on the engine dyno? i don't really want to do to much once its in the car

allports

You can but it wont be as drivable. You need to drive in reallity to tune it the load factors change so much and you cant load the dyno as though its a car on the road at 60kmh.

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa

moot

how do you load up a 600hp car with a 5500rpm convertor on street tyres at 60 kph?

allports

You dont need to load it Lol. All the parameters need at least 1 box in each column (Loadcells) locked in then you can use the computer to make an estimated guess. And you can tickle its anyway you wish from there. Part throttle tuning is very important for the cars drivability.

__________________
If you plant a cucumber, you get a cucumber!
Two things are infinate,the universe & human stupidity, and Im not sure about the universe.
Albert Einstein
Without deviation from the norm, progress is not possible. Frank Zappa