Yeah I know, I get jealous that you get to do this for a living...lol
15"bridgeport?
The thing that sucks about cnc though is if you don't watch every cut things can go bad FAST! Even my bud whos been doing this for 20yrs went away from the machine for 1min and came back to see the mill cut the part and continued through the table!lol

 

I just remembered another reason why I prefer the genIII intake, that would be the location of the thermostat housing, it's in a location that makes it easier to clear or modify to clear belt routing.

I made a new tensioner mount, that also held the upper bolt of the alternator. On the driver side, I milled the power steering mount a bit thinner and used a 1/2" piece of aluminium to adapt the bracket to the head bolt pattern.

I thought you said you were using genIII heads, did you not mention they have D-shaped exhaust ports?

 

no i mentioned to somone that gen 3's have d ports and gen 2's dont.
as far as the thermo housing im actually cutting it off the manifold and moving it to the same place it is on the iron head manifold
happen to have any pics of how u modified/adapted the brackets?

 

No, I don't have any pics, though I might be able to grab a pic or two tomorrow when I'm in the city that the truck is, and if I can find the parts. I think one is still attached to the engine, and the other, I know is around, but may not be easy to find.

 

Got a quick question. Im not really sure by the pictures how you are going to route the runners, but if I get a hold of a gen III lower intake and send it to you could you make it work? I know that the #6 runner covers the dist. hole, but I dont know if you would be able to mill that back enough with the design you are going to make.

 

without having a manifold in my hands its hard to say if i could modify it.chances are i could mill away the intake were it interfers with the dizzy and just make a new runner or 2 and leave the rest alone.but id need a whole manifold in my hands to even look/think about how to do it.

 

just an FYI, mildly ported 3500 SFI heads have been proven to flow above 290 CFM on the intake side.... More than enough to support 300 HP N/A. Slap a decent cam in there with the LX9 top end and you'll be set.

Gen2 heads are barrely worh the scrap exchange


here is a 3500 exhaust gasket sitting on a 3.1 exhaust manifold..

http://www.superdave81.com/mini-3500%20037.jpg


also, runner #6 does not cover the dizzy hole on a gen3 manifold, i can get pics if you like... i have a couple 3400 LIM's and a 3500 LIM sitting around.

 

yeah man pics would be great
290cfm damn im only getting 233cfm @.500 out of the gen2's
are 3500 heads a bolt on deal? well as much as a bolton deal as what im already doing?

 

Yep, same as swapping on a 3400 top end. and the combustion chambers are a tad larger so it'll drop the SCR slightly. I just finished porting a 3500 top end, the heads are amazing in compairson to a 3400 head...

IIRC the 290 ish CFM came between .500 and .550 lift. About .560 is max lift with LS6 springs and without any clearancing. My cam is .559 in/.557 ex

the 3500 heads also have lighter valves and improved cooling VS the gen2's and gen3's.

I'll double check on any overlap on the CC VS the 3.1/2.8 bore. I know people are putting them on 3400's w/o problems

Pix tonight after work...

 

thanx man deff let me knwo whats up,im ready to scrap all my work so far if they work out 290cfm flow is dam near amazing
i know what power i made with crappy flowing iron heads and 290cfm would be like 120cfm increase in flow

 

What's the LX9?
All years of the 3500 heads are the same, what were they put in?
Thanx for the pic! That's a HUGE difference!

 

from what i could dig up real fast the lx9 is a 3500 without vvt and came in a pontiac g6 rated around 200+ hp from the factory.depending on cost and availabilty im ready to scrap my whole topend setup and do some ported 3500 heads

 

vvt=variable valve train? I don't know why I have trouble with abbreviations

 

varianle valvetrian.variable valve timing etc think vtec lol

 

YOU would port them?

 

port what? my aluminum heads are already ported,and if i do decide to use the 3500 heads id port or get them ported as well

 

It's not something to laugh at, actually! If GM did "steal" this design, it far surpasses the dual cam scenario. If you've done any research on it, it's actually like having two cams. As the rpm increases, the rocker ratio is altered to act like a bigger cam w/more duration.
GREAT, just what I need - now I'm going to spend the next three nights studying up on this!

 

Well they came out in 2004, so they are probably going to be expensive for the moment - doubt you'll see one in the junk yard!
I'ts amazing, the V8 guys can't figure out why we stay with the V6's but these 3500's are putting down 213hp/221lb-ft! That's only slightly less than the 305 of our cars' generation.

 

the funny thing is the cam specs... 118-120 LSA on the VVT 3900


3500 heads on the block...



3500 LIM on the FWD way



3500 LIM on reversed




Straight Down (i was wrong, the #6 runner does hang over slightly)





If you are doing all this work, it might be worth your time to get rid of the dizzy and go DIS...

 

Yeah the amount that needs to be milled away on the #6 runner completly blocks the runner if you were to seal it off again.

Then you'd need to deal with the fuel rail, that even with a custom one, due to the factory location of thehinjector places the fuel in the same area that the dizzy cap occupies.

 

man, the things you people do............................... i wish i could stay so dedicated. after i sold my V6 RX-7, i bought an 88 RX-7, and so far ive only got the chevy 350 mounted in it. its been at least two months since ive touched the car. i admire all you guys, and yalls dedication.

 

lol im just out to put a 60* powered f-body into the mid to high 10's to low 11's
wont stop till i do it,or wreck it
i like a nice challenge

 

Everyone I talk to about this says Im crazy/stupid. I just want to make/get the most out of my engine.

 

RIGHT ON! I'm with ya....

 

I could only grab a picture of the tensione/alternator bracket, the other adaptor is packed away somewhere, probably in the truck, I do have other pics though that were taken a long while ago.



Here is the other adaptor circled in red, this is the best I can do for now.


Here is a pic with the belt on, out of the truck:

 

thnx man those pics will be a great help to me

 

Are you using a cylinder in your flowbench to shroud the valves like the block will? I haven't flowed anything near 290 cfm on 3500 heads and I have gone through quite a few variations on porting.

 

he didnt say if he did or not im still waiting for him myself to post back up.my gen 2's were flowed with a 3.510 bore size and got 233@.500.i wish i knew how much my old iron heads flowed but i never had them done when i built the old motor in the car
sappy anychance u can throw me a link to the flowsheets for the 3500 heads u have on 60degreev6.com, i tried searching but couldnt find them

 

http://60degreev6.com/store/images/f...comparison.jpg

Thats the only one I have up right now. Thought I had posted it on the site itself but it seems I am way behind on that. Looks like it got deleted from the old site software. Ill flow another head here soon stock for intake exhaust and get it posted on the site.

 

I was going through some pictures and found this one that shows the alternator/tensioner mount bolted up.

 

thnx again six

 

I was just going by what "you know who" said.

i haven't flowed mine yet, the place is about 5 miles away but i gotta wait till after xmas to get it done.

I'll post sheets ASAP

 

heya mine came out the same way almost.
i used all the stock brackets,i bolted the ps pump bracket to the head and waterpump(had to weld on some material to make it bolt on.)and i used the stock rwd alt/tensioner bracket,what i did with the alt was to bolt the bracket to the head with one bolt,and rotated it till the altanator was stright down were the smog pump used to be,i welded onto the stock bracket so it picked up all the bolt holes in the head.im using the tensioner as an idler pulley.and a made the bracket for the alt like a vbelt setup,so i could use that as a tensioner. ill get some pics tommorow while im at work since i forgot to do it today.

 

I heard the combustion chambers are too wide on the 3500 heads to use on a 2.8/3.1 bore.

 

yeah the 3500 heads wont work on a 2.8/3.1 bore and i think i remeber reading they wont clear a stock 3.4 bore/or it would be a really tight fit

anyways here ya go just about ready for final assembly

 

Did you use that Duplicolor paint?

 

wow...its scary how familiar that looks! I had mine painted that same blue at one point!

 

yeah i did

 

Betcha the pics don't do it justice!!! That annodized paint is some nice looking stuff, I painted the new water pump with it.

 

hey man any hints to how ur car is comming along??? last i remeber u were getting ready to go forced induction.

oh hey do u happen to have that video of u vs the corvette i belive it was

 

unfortunetly I haven't had a lot of time to work on the turbo setup recently. I did start to CNC my flanges for my intake manifold but I messed one of them up and haven't had a chance to get back to it, yet.

Yes, that video is on my website. www.McKinneyRacingProducts.com under "test car"

 

Those are some nice looking manifolds!