Hello everyone!

I am in the process of planning out my 350. Just wondering if I could see some of the heads/intake/carb/cam combos you guys are running.

heres some pics of it, its a '69 350, 411 heads:




Thanks for any input guys!

 

so no ones built any 350s lately??

 

I have an 85 350. It is bored .030 over and balanced to about 8000 rpm. It has a stock cast crank, Eagle SIR I beam rods, TRW Hyperutectic pistons with a .125 cc dome on them. World sportsman II heads with 72cc chambers and 2.02/1.60 valves. Wieand XCelerator intake, trw camshaft with about 240 dur. and .510 lift on the inake and exhaust. Carter AFB 600 carb.
Any more questions, just ask.

 

thanks for the reply!

any track times? did you have it dynoed?

thanks

 

No dyno slips yet. No track times either. I 'm bringing the car in this weekend for a new transmission because the on in it is fragged. I am racing on June 7th so i will post time after that. I will probably have it dynoed after that. I'll keep you posted.

 

94 LT1 shortblock
GM LT4 Aluminum heads 2.02/1.60 valves
comps 502 grind on a 110 (basically a 219/228 cam)
holly 750 vac secondaries

im expecting no less then 450 ponies

 

Anymore questions about internals that are'nt in the sig, just pm me.

 

Here you go:

https://www.thirdgen.org/techbb2/showthread.php?s=&threadid=179998

 

What's a 411 head? Never heard of that casting #.

All of what's on top of that motor is not 69 stuff. It's smogger 70s, the EGR, the M4ME carb, and all that. Looks like about 73-74 to me, including the points distributor. At least the block has flat-top pistons.

 

The heads:
1968-72, 3923441, int. 1.94, exh. 1.5001, 76 CC

The intake and carb are not original, as the casting # says it was a 2bbl.

kdgreen: Nice car! Nice times too, what heads and cam are you running?

 

350, 10.7 compression. Vortec heads, bowl work, valve job,
forged flattop trw's, 4130 forged crank, polished Xrods, comp Xe274 cam, performer rpm vortec intake, 780 vac sec holley list 3130. hei.

best time on cheaters, open exhaust 12.06 @112.5
best time on streets tires. and exhaust 12.42 @111.6

 

That would explain why the heads exist, but the first casting # you posted didn't.

I would throw them in the garbage, and get some decent heads. They're early smoggers. The 441X was a somewhat better casting but still suffers from the early smogger problems. Some people say they port up OK, but their chamber design pretty much rules out decent compression with anything but a dome piston, which is much less efficient than a smaller chamber head and flat-tops or even a dish.

Do you have any kind of a budget or a goal for this?

 

.30 over 350,forged Speed Pro pistons,Eagle H beam rods,Comp Extreme Energy 284 cam,Victor Jr. intake,Holley 750 dbl. pmpr.,Edelbrock Per. RPM Heads.I have no times yet,the motor has less than 100 miles on it.More info or pics just ask.

 

mine is in my sig.

 

Thanks for the replies everyone!

 

350. 030 over with speedpro pistons,with 10:1, comp cam xtreame 274, Stock 76cc heads, Edelbrock rpm air gap, 670 street avenger, Stock HEI, 1 inch spacer, Making dino proven 351 hp and 402 ftlbs of torque.

 

Thats pretty close to what I'm leaning towards. Did you have the heads ported at all? Also, how is the idle on the XE274?

Thanks alot!

 

It idles great. It has a good rap to it but not all hard core idle if you get what I am saying. I have no port work done to my heads that I am aware of. I ordered the heads from Hye Tech Performance and when I called to order the guy said he would throw in some extras for free but I only thought he was going to stiffen the springs. So maybe a little port smothing but not a noticeable amount. I also forgot to mention I am running Harland Sharp Roller Rockers with 1.5 ratio. If your running close to the same stuff I am I already had mine dinoed and it made 351 horse and like 402 lbs of torque with a one inch spacer.

 

i'm guessing the 1" spacer and air gap don't fit under the stock hood, right?

also: is that 351hp at the flywheel?

 

I'm selling a double inlet aircleaner intake from my old 80 corvette. I restored it if you want it. I also have the stock single aircleaner intake(not restored). forsale.

 

I'm not looking for aircleaners

 

Yeah the one inch spacer and air gap make it to big for a stock hood. The only way to get it to fit is runs a performer intake an a good drop base air cleaner and it is still a tight fit. Yes that is at the flywheel

 

85_ZED28, you may want to reconsider using those heads.

The motor sounds like a good deal.. any 350 block is a good choice. Do you know what kind of block it is? There are two places you can look to find out what it is. The first place is in the rear of the motor where the transmission hooks up. If you look at that ridge that stucks out just directly above where the bell-housing bolts up to, you should see some casting numbers... dates, etc. It should give you a 3-letter code.. like CMJ or something.

You can find out exactly what it came from too by looking at the VIN that's cast in the block. In the factory location of where the alternator would normally go, you can find the VIN number stamped into it. It's on the flat part.. forward of the passenger side cyl head.

This way you can find out whether or not it's a 4-bolt main or not. (or you could just remove the pan).

However, the heads sound to me like it might be a waste of money.. likely the motor the way it is now is probably putting out around... realistically.. about 160 horsepower. Of course, it's probably putting out like 260 pounds of torque too.. but only 160hp realistically. The heads are the big issue here, I would consider replacing them. Don't junk them, but return them as cores when you buy new ones. Those heads you have are probably from a pickup truck.

If you want factory GM heads, look for a set of HO (Double Pyramid) or Camel Heads (Double HUMP heads). You will see these in the side casting. For more information about casting numbers, etc.. go to www.nastyz28.com


As for my motor, I've got a 350 4-bolt. It's currently sitting in my 1981 TransAm. The motor and heads were pulled out of a 1976 Chevrolet Camaro. However, the engine and heads came from completely different cars. The block is a CMJ block (higher nickle content than most blocks), it's a 4-bolt from a 1974 Impala Police Car (used to be bolted to a TH-400). The heads are from a 1971 Chevrolet Corvette. They are HO heads, 2.02:1 intake, and 1.6:1 exhaust. Great valve sizes.. but they are the lower compression 76cc heads.. so they were made more specifically for low-end torque. I really have no idea what kind of cam-shaft I have. When I got the 76 Camaro, it wasn't running. The motor had been rebuilt about 30k miles ago... about 10 years ago. I replaced the intake manifold with a performance Holley intake, and threw on an Edelbrock 1405 carburetor with electric choke (installed the electric choke afterwards). I did all this work to the motor while it was in the Camaro just so I could get it running. I ended up junking the Camaro, but let me tell you.. when I took that thing out for a spin the very first time... Jesus.... The Camaro was so badly rusted in the rear and in the quarters that I got stress fractures in the roof..... I nailed it in my apartment complex parking lot and I about lost control.. the car literally spun in circles from a stand still.. also, it totally trashed the transmission mount on the cross-member. Originally, it had a factory GM intake and regular non computer controlled carburetor with a points distributor. I replaced the distributor with an HEI from a late 70s NON computer controlled car.

I'm guessing I'm probably putting out around 300hp.

In my 81 TransAm.. with Posi, and 15" wheels, 3.23:1 final drive, I'm expecting probably around high 14s in the quarter mile.

 

350HO Motor with MSD6A, MSD Pro Billet Distributor, true dual exhaust with X pipe and 2 1/2" bullets:
12.93 @ 106mph

Now I have put the XE274 cam in, bumped the compression from 9:1 to 10.06:1, put a victor intake on it and had the heads ported and polished.
12.69@107.7 with tuning issues. I will have updated times tomorrow.

 

Wow, that's pretty sweet unknown_host. That's what you have in your 3rd gen? What kind of heads are they? Do you know what casting they are? Intake Size?


Thanks!

Todd

 

Vortec heads, L31's.

 

ttt

anyone else??

 

-Roller cam block with Powdered Metal stock rods.
-Stock LT1 roller cam with 1.6 roller tip rockers.
-Either a weiand stealth or a Holley square flange intake (I haven't decided yet).
-Holley 600 CFM double pumper (#4776)
-Ported/Polished 416's with 1.94/1.60 valves and K-motion springs (crossing my fingers, hoping my springs won't break )
-Stock but new roller lifters.
-1" open spacer.
-Flat-top hyper pistons giving me right around 10:1 comp. Gonna be tight on 92 octane.
-Rebuilt but stock HEI with no comp controls.

Few other small things, but like I said at the beginning, it's not together yet, so I'm not too sure how well it'll run. I've done a lot of research, and this seems like the best way to make power for cheap. I'm hoping for at least 1hp per cu.in.

 

ttt

 

mine is in sig, 381.4hp, 426.8 ft/lbs @ 5500 Rpm