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GT-40 cast iron heads on 347 HELP!!

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Old 07-25-2007, 02:06 PM   #1
86gt_wit_Ts
 
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Default GT-40 cast iron heads on 347 HELP!!

I have a set of cast gt 40 heads ported & polished with stockvalves and springs. I dont know what they flow. I was thinking about putting them on a 331 or 347 shortbk with BBK SSI intake Anderson Ford
B-31 cam. forced induction later. What do you guys think.
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Old 07-25-2007, 02:10 PM   #2
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Default RE: GT-40 cast iron heads on 347 HELP!!

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ORIGINAL: 86gt_wit_Ts

I have a set of cast gt 40 heads ported & polished with stockvalves and springs. I dont know what they flow. I was thinking about putting them on a 331 or 347 shortbk with BBK SSI intake Anderson Ford
B-31 cam. forced induction later. What do you guys think.
with that thing ^^^ = poop

are you a budget build? if your gonna be skimpy on you build get a gt-40 intake or something that looks good like the typhoon intake

**edit** your stroker kit will not be able to operate at its potential if you use very limited products, gotta have the flow to go!
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Old 07-25-2007, 02:14 PM   #3
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Default RE: GT-40 cast iron heads on 347 HELP!!

What about the heads? What out performs the SSi?
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Old 07-25-2007, 02:25 PM   #4
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Default RE: GT-40 cast iron heads on 347 HELP!!

don't skimp out on the heads!!!!! trust me!!! i had completely reworded e7's with bigger valves. it suffocates the motor.

at least some trickflows, afr, canfields, eddy's something.

get a holley systamax or trickflow r and a custom cam. with boost friendly compression it will still make some power
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Old 07-25-2007, 02:33 PM   #5
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Default RE: GT-40 cast iron heads on 347 HELP!!

I want to make 400 to the wheels give or take on motor alone 9.5comp. give me an example part list to go on .
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Old 07-25-2007, 02:37 PM   #6
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Default RE: GT-40 cast iron heads on 347 HELP!!

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What about the heads? What out performs the SSi?
hehehe.....everything. if your on the cheap i suggest, typhoon from pro. products, lots of room to be worked, very thick casting. if your looking for performace then i suggest holley systamax or trick flow R as listed above.

custom grind i agree on.

heads, dont go cheap
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Old 07-25-2007, 02:46 PM   #7
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Default RE: GT-40 cast iron heads on 347 HELP!!

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Old 07-25-2007, 03:12 PM   #8
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Default RE: GT-40 cast iron heads on 347 HELP!!

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I want to make 400 to the wheels give or take on motor alone 9.5comp. give me an example part list to go on .
price range? if your looking for ideal set up, get something like RHS 180cc alum heads or AFR 165cc, Eddy RPM performer II, Typhoon, or Holley Systamax intakeand a custom grind cam. with your stroker kit you'd be close but put a 100 shot of juice for good measure and you'd be at 400 fo sho!

everyone will have an opinion, most of them all will work to get you at 400HP
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Old 07-25-2007, 07:26 PM   #9
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Default RE: GT-40 cast iron heads on 347 HELP!!

I recently saw the spec's on the Anderson cams.
I wasn't impressed in the least.
You'll do better at Comps for about the same $$$$$$$...........
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Old 07-25-2007, 08:04 PM   #10
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Default RE: GT-40 cast iron heads on 347 HELP!!

is this a daily driver ? thrashing at the track every weekend ? or a combo of both ?

asking for 400 hp, i assume you want to go mid to hi 11's since thats what 400 true hp will get you

you don't need a stroker for 400 hp, not at all. here was my buddies setup and he went 11.60 or 11.80 (he swapped out to a c4 from his t5 and i don't remember what time went with what tranny)

anyways....bone stock 302shortblock, '92 gt almost full weight(removed sway bars and rear bumber inner)
gt40 heads, ported exhaust, slight ported intakes, a little deck to get them to 10:1 compression, some kind of upgraded valve springs, but nothing major
stock cam , stock crank
box stock gt40 intake (real one...nothing looks better)
4.10 gears
125 dry NOS 5115
et drags 26X10.5
65 tb
80mm maf pro-flo
24 lber's
255 fp

launched at 5k on the spray, yankedan ez foot, et'd at 11.80 and 11.60 on each trans

totalinvestment ? probbaly $2900 tops

those hard launches did break 2 axles so he went 31 spline mosers, then he broke the t5 thats when he went c4 and never broke anything again

if you want 400 on all motor, then stroke it, those heads will work though, i like them alot

stroker + blower or 100 shot = 500 hp and 10's all day long, i have 2 buddies like that, a 327 crate motor and a 347 kit from anderson i think
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Old 07-25-2007, 08:39 PM   #11
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Default RE: GT-40 cast iron heads on 347 HELP!!

This will be mostly a weekend car. Basicly restoring my 86gt. I want show and go. My engine bay budget is about $7000 Tha will have to buy everything. So, anyone with Ideas bring them on. i already have a Tremec and short-throw shifter. Also, I need to upgrade to Mass-Air. Bring on the part lists.
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Old 07-25-2007, 08:40 PM   #12
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Default RE: GT-40 cast iron heads on 347 HELP!!

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Old 07-25-2007, 09:44 PM   #13
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Default RE: GT-40 cast iron heads on 347 HELP!!

I found this intake teston another site

[IMG]local://upfiles/29615/7811D79B785F4E678F4BE598F8964082.jpg[/IMG]
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Old 07-30-2007, 11:47 PM   #14
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Default RE: GT-40 cast iron heads on 347 HELP!!

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Old 07-31-2007, 12:27 AM   #15
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Default RE: GT-40 cast iron heads on 347 HELP!!

I know a guy round here with a 331 in the high 11's with afr 185's and comp cam stroker cam and trickflow track heat intake. Id use a tubular gt40 myself because of how badass they look even if i do sacrifice hp for torque.
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Old 07-31-2007, 01:09 AM   #16
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Default RE: GT-40 cast iron heads on 347 HELP!!

The GT40 intakes do look very nice. As gar as those GT40 heads, you won't be able to run a decent cam with stock valve springs, you'll float the valves
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Old 08-16-2007, 05:11 PM   #17
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Old 08-16-2007, 05:23 PM   #18
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Default RE: GT-40 cast iron heads on 347 HELP!!

Kmotion valve springs will do the trick... GT40 iron head are nice... but i already want to change mine. If you have a 7k budget just get some canfield heads... don't skimp
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Old 08-16-2007, 05:45 PM   #19
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Default RE: GT-40 cast iron heads on 347 HELP!!

AFR 205CC holley system max 2 or edelbrock rpm 2 and a custom cam and i think a stock 5.0 intake will out flow a SSI
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Old 08-16-2007, 06:00 PM   #20
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Default RE: GT-40 cast iron heads on 347 HELP!!

The bbk SSI intake looks pretty good. So good in fact 2 years ago me and my buddy both ordered one. I never got to install it though. The workmanship was terrible. The logo on both were hardly readable. One had a 2in gash on top, it looked like someone hit with a 4lb hammer, the other one was cracked at one of the bolt holes all the way through. Both had a lot of shavings throughout and both also had like 3 and 4in. jagged metal in the top of it where the TB connects, the metal was real thin. It just seemed like it missed a couple of the finishing steps. BBK were actually dicks about it. I bought them from brothers performance and they gave me a full refund,payed for shipping back and they said they would deal with BBK themselves. If you search, there are too many people having problems with the intake.
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Old 08-16-2007, 06:00 PM
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