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Old 01-16-2010, 08:46 AM
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Novice Question

I am the proud owner of a numbers matching 1969 GTO. It is the middle of a very LONG restoration (life gets in the way too much) and I have been researching what to do with the engine. I am reading about Stage 1 and Stage 2 porting and notice it is extra on most builds, but I do not know what it does/hp gains? I am wanting a streetable car that will NEVER see the track, but would like to lightem up ever now and then...your expertise is much apprieciated.

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Old 01-16-2010, 11:37 AM
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If you do nothing else to the heads, I feel a pocket port job benefits any stock type head. I'm talking about cleaning up the factory back cut and blending it into the port a bit. Another area to look at is how well the intake matches the heads at the gasket surface.
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Old 01-16-2010, 12:07 PM
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Quote:
Originally Posted by HoustonAE2
I am wanting a streetable car that will NEVER see the track, but would like to lightem up ever now and then...
To just be able to spin the tires, you do not need to do squat. If you're going to have the engine rebuilt, have a three angle valve job done on it. You can back cut the valves w/a 30 degree cut if you feel you just have got to do something extra, but w/a fresh engine, the car will spin them for basically as long as you keep your foot in it- w/street rubber.

Is your car a RA III or IV, stick or auto? This will affect what the correct heads are for it- what is the casting number of your heads?
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Old 01-16-2010, 01:57 PM
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Quote:
Originally Posted by HoustonAE2
I am wanting a streetable car that will NEVER see the track, but would like to lightem up ever now and then....
Something to think about: http://ultimategto.com/1969judcars41...ud/69j_00211_1 Scroll half way down...
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Old 01-16-2010, 02:39 PM
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Yea, I saw that wreck too. I have also been in 3 wrecks myself (only one my fault)...guess you got a 4 banger in your car so you don't exceed the limits
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Old 01-16-2010, 03:51 PM
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Old 01-16-2010, 05:32 PM
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Quote:
Originally Posted by HoustonAE2
Yea, I saw that wreck too.
One last time: What heads are on it and is it a 2-bbl engine, the standard (350 HP) engine or a RA III or IV.
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Old 01-16-2010, 05:37 PM
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Quote:
Originally Posted by HoustonAE2
Yea, I saw that wreck too. I have also been in 3 wrecks myself (only one my fault)...guess you got a 4 banger in your car so you don't exceed the limits
Don't think you have checked his gallery have you. Don't think thats a 4-Banger in there. You might want to have a look see.
Ain't that right Blazin72. Talking about the Blazer, And the little general lee it's pretty quick for what it is still get a man in some trouble .

Cole

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Old 01-17-2010, 07:36 AM
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Quote:
Originally Posted by cobalt327
One last time: What heads are on it and is it a 2-bbl engine, the standard (350 HP) engine or a RA III or IV.
The engine is the standard 350 hp with a turbo 400. Don't know what heads it has but I believe they are the 6x, have to double check.
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Old 01-17-2010, 09:34 AM
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Quote:
Originally Posted by HoustonAE2
Yea, I saw that wreck too. I have also been in 3 wrecks myself (only one my fault)...guess you got a 4 banger in your car so you don't exceed the limits
Snide remarks like that won't win many friends around here....
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Old 01-17-2010, 10:42 AM
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what is the rear gears ratio? that is the key to making smoke!

(motor cubes is basically max TQ so) cubes x low gear tranny ratio x rear ratio=actual total tq force on the tires at launch,,,divide total tq by car weight=force (aka leverage) per lb of weight...
(that's the oem classic "muscle car" recipe,,,lots of cubes with lots of gear is lots of smoke and fun to drive)

back to basics:
the stock heads can flow way more than enough cfms at low rpms,,,(due to low motor total cfm at slow piston speed)...
they are engineered to make max quickest hg recovery to produce max tq ft/lbs per rpms increase (with the stock cam engineered to match the heads)...
"unless" you do have truly crappy smogger heads...
(ex?: that's why Ford put tiny valves and runners 302 cubes heads on the truck 351 cubes motors,,,excellent(!!!) for max low end tq,,,"more better is not always more better" depends on what your after)

for making even more smoke,,,tuning the ign timing is the most effective way (to increase low rpms hp/tq)...
(oem settings are truly "compromise" values so the motor will run anywhere on the planet)
common and typical to see a 20HP/20TQ+ gain at any/all rpms (driving normal or messing around!) that you can feel driving due to ign performance tuning...

due to slow piston speeds and slow valves movement speeds causing terrible cylinder A/F fill at low rpms it's darn tough to actually gain "significant" TQ at low rpms "inside" the motor...
changing the cam advance/retard shift's the whole hp/tq power band up or down...
(makes a better fill at low or at high rpms)
I don't know your oem cam spec but that is definitely worth researching...

since you just want to burn rubber,,,I'd call it a done project after ign and cam....

it's forever and a day to research to find the precise further tweeks that will help at low rpms...
(which I did do for my present motor but then I am nuts!!!)
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Old 01-17-2010, 12:38 PM
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I'm not 'correcting' anyone here, take it as my opinion.

AFA gear ratio and spinning tires, a tall ratio will spin far longer and further than a short ratio. The short ratio will, however spin the tires "easier". Just not longer.
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Old 01-17-2010, 06:27 PM
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My gear ratio is 3:55, which I am updating to a 3:73 when I get the rear end redone. Currently the car runs great, being a 40 year old motor. I am just wanting to only build it once and am torn as to what direction I want to go with the motor (stock rebuild, mild [i.e. 400-450 hp], or wild [i.e. 500+ph]). The car is an original numbers matching...so you can see I just don't know. The only thing I truely know is that I want it to remain Poncho..
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Old 01-17-2010, 06:50 PM
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Quote:
Originally Posted by HoustonAE2
The car is an original numbers matching...so you can see I just don't know. The only thing I truely know is that I want it to remain Poncho..
My thoughts on this would be to remove and store your 'correct' engine, and build a stroked 400 Pontiac w/KRE or even Edelbrock aluminum heads for fooling around with.

You're gonna be hating life if you trash your good block w/a 500 HP build. And if your original engine has never been rebuilt- that's even more reason to leave it alone.

They are only 'original and un-rebuilt' ONCE!
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Old 01-18-2010, 07:35 AM
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Quote:
Originally Posted by cobalt327
My thoughts on this would be to remove and store your 'correct' engine, and build a stroked 400 Pontiac w/KRE or even Edelbrock aluminum heads for fooling around with.

You're gonna be hating life if you trash your good block w/a 500 HP build. And if your original engine has never been rebuilt- that's even more reason to leave it alone.

They are only 'original and un-rebuilt' ONCE!
Good point, good point...Still got a lot to think about but thanks
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