NOT BLOWN UP! Pontiac 326 needs head gaskets and heads to live again!

Рет қаралды 12,681

Driven2Compete

Күн бұрын

Пікірлер: 54

@terrypetty9822 8 ай бұрын

The "66" 455 heads gave you less than 6:1 compression.

@terrypetty9822 3 жыл бұрын

So 110 cc heads, plus it looks like the cylinders are double-chamfered for early and late heads so that probably takes another 5 CC out. That would put that engine at less than 6:1 CR, dipping into the 5's. Your absolute best bet would be a set of the smallest chambered heads you can find. The 140's are ideal. and have the biggest valves that head would hold. Port the 140's and get back that lost compression.

@mattkurtz8549 2 жыл бұрын

Lol I said the same thing , 110cc on a 326 would run on piss

@Nostradamus_Order33 Жыл бұрын

Later Pontiac heads are the only engine part that screams, “put a blower on me”.

@doomman700 Жыл бұрын

Isn’t bigger better 😉

@joequillun7790 Жыл бұрын

@@Nostradamus_Order33 I agree. I have a set of 197s, (71 455 HO round port), that have nasty 110ccs. If I can't find domed pistons, then a blower or turbo follows that. (Only on a punched 455)

@CashMullen-ng4sr 11 ай бұрын

Bolting on a set of 110cc heads on a 326 is total nonsense. You get something in the neighborhood of 6:1 CR. Somebody had no idea of what they were doing.

@fishstix2620 Жыл бұрын

Same here, love them!!! 67 Firebird 455 4speed rock crusher! PONTIAC POWER✌️😁🤘

@Rattdogg4q2 2 жыл бұрын

1967 was a transition year where both open and closed chamber heads were offered, as well as both 20 and 14 degree valve angle heads. 68 and on all are 14 degrees

@BrandonLeeBrown Жыл бұрын

Unfortunately, the closed chamber heads restricted the flow around the valve above 0.420" - 0.425" lift or so, even with the big valve 14 degree heads. The open chambers really allowed the RA II cam to work. The 14 degree heads got matching high rise intakes with Q-Jet carbs, due to the improved ports. The 1965 camshafts had 75 percent cam lobes, except the 2 barrel engines. The 1964 camshafts had old 70 percent cam lobes. That is, the 0.050" lift duration was 70 percent of the SAE 0.006" duration. The 1964 GTO camshaft is a bit of a mystery camshaft. It has the same specs as the 1964 automatic transmission cam on paper, but has a different part number and was used with automatic, manual and tripower 1964 GTO's. Some speculate that it might have been an early 75 percent cam lobe cam. In 1965 the intake ports were improved and the camshafts updated and the engine blocks were cast using thin wall casting technology for the first time.

@kevin2960 9 ай бұрын

There's a lot of good Pontiac heads. The closed Chambers are probably a little better however you need to unshroud the valves

@terrypetty9822 8 ай бұрын

Including the tops of the cylinders (chamfer).

@milkmanpeter 2 жыл бұрын

Glad I found this video. I was telling my son about the casting slop all over my engine. And to here I am not only one makes me fell I'm not crazy

@matthewklein9225 Жыл бұрын

Wide ratio is the RPM drop between gears. A large drop. Not the distance the shifter moves.

@larryoilund3377 8 ай бұрын

375k mi. on my 326.

@russbonneau9152 Жыл бұрын

the original heads were better high compression heads.

@vincentfarquhar9671 Жыл бұрын

EXTREMELY low compression with the #66 heads.....

@Driven2Compete Жыл бұрын

Thanks for the input. Heads were milled, block decked, and so on. Compression is still not where I want it at 9:1

@joequillun7790 Жыл бұрын

@@Driven2Compete Even W/ "0" deck height, and heads milled to the water jacket, you still won't make anything logical. If you put a 2bbl on it, and never spin it faster than 2500 RPMs, you probably won't care. And if gas quality deteriorates worse than it is now, you could run a total advance of 45°, all in at 900, and never have ta worry about detonation. But if you want some kinda decent mileage, power, and throttle response, ditch those heads for "anything" would be better. It looks like you have other options in your garage. Take advantage of it. By now, you've probably rectumfied the issue. Curious about a follow up.

@PAStreetScene 3 жыл бұрын

I'm shocked by how rough that casting is!

@Driven2Compete 3 жыл бұрын

Typical GM casting from that era

@terrypetty9822 3 жыл бұрын

On the 140's,, it's a good idea to gasket match (port) the heads and make sure the intake manifold port is not bigger than the head port.

@josephlacy9397 Жыл бұрын

Looks like it was leaned out

@dougalbyrne2817 7 ай бұрын

Jesus what size turbos are you putting on !?

@hotrod6919 Жыл бұрын

Years back my 69' gto that ive had since 94'-95' also. I blew the head gasket on a fresh 400 because the machine shop reversed one of the center head bolts with an outter one thats a longer bolt and it bottomed out instead of torquing head down

@Nostradamus_Order33 Жыл бұрын

What year were they different? I thought they were all the same length.

@rodneyaker5111 2 жыл бұрын

Your compression is probably way low with 110cc heads. like below 7:1 compression.????

@mattkurtz8549 Жыл бұрын

110 ccs on a 326 what's the cr 7-1

@rodneyaker5111 2 жыл бұрын

I'm building a 326 now using the 140 heads except I am having the exhaust cut out to 1.66 valves and ported. should be 9.5:1 ish.

@Driven2Compete 2 жыл бұрын

I had them deck the block. I had the port and polish the heads. Should be 10:1 compression. Found out the old shop milled the heads, but left the compression at 8.5:1. So, I should see a huge difference between the compression, head work, new performer rpm intake, roller cam, and so on. There will be a follow up once I get the motor back.

@doomman700 Жыл бұрын

Wow I bet that ran terrible, performance wise. 455 heads with huge combustion chambers on a 326 would net you 6:1 or lower compression. I would buy a closed chamber head for sure.

@davebdave1 2 жыл бұрын

I think I’m in the same boat. Car overheats in minutes and there’s coolant in the oil. I’m hoping I can do the job with the engine in the car (1978 TA)

@patrickwendling6759 2 жыл бұрын

Thx

@tigger7390 2 жыл бұрын

66 casting/71 455 d port

@Driven2Compete 2 жыл бұрын

Just got the motor back this evening. Look for a follow up video real soon.

@mb-fs1yo 2 жыл бұрын

I think you need to cc your heads, can be done with a 50 cc and a 10 cc syringes. Then get on a calculator and figure out what your actual compression ratio is.

@delanniewiggins 2 жыл бұрын

I'm trying to build a 69 Pontiac Grand Prix xh 400 engine

@arvotomrdle7011 2 жыл бұрын

enjoyed your video, im also going through a 326, have #46 heads , in the process of installing rocker studs to make the valve train adjustable. My plan is to put a 68 cam in and retard it 2% and put a 66 389 4 barrel intake on it, hopefully this setup will work, not much info on a 326

@brucefulper4204 7 ай бұрын

poly locks are all you need to make any Pontiac valve train adjustable

@paladin0654 Жыл бұрын

Love the heads, not so much the "and uh".

@jimmyjamsweetlove2338 Жыл бұрын

Wow that's nuts on the motor slag. My 66 326 doesn't look anything like that. What year is that block?

@Driven2Compete Жыл бұрын

That is normal for Pontiacs. Someone cleaned yours up at some point. It's a 67 block but I've had newer blocks from 74 look the same.

@stephenflowers8516 Жыл бұрын

1967 Pontiac went to 3 freeze plugs per side. So that's a 67 block 68 there were no 326s 68 the 350 was introduced.

@brucefulper2433 Жыл бұрын

Wide ratio....Close ratio....HAS NOTHING TO DO WITH THE SHIFTER!!!! It's gear ratio reference!!!

@robertcsmith2816 Жыл бұрын

Exactly Bruce!!!! Right On

@Mr7352 Жыл бұрын

I have a question you might be able to help me with,, i have a 1967 pontiac firebird with a 326 ,engine was rebuilt quite a few years ago before i bought it from a friend .yesterday i went to start it ,and i was surprised to hear what sounded like a really bad exhaust leak from back of engine, turns out rear of passenger side head has like a small freeze plug next to big freeze plug blown out .looking at your video i spotted same kind of 2 plugs ,one large on small..anyway my question is there a way to replace that small plug without removing head., it is kind of a tight spot . I really would appreciate your help. Thank you

@swatterbirdwatts6680 Жыл бұрын

Wedge Heads.

@shawnmartins169 Жыл бұрын

I strongly disagree with you the deports are higher compression Which will make more power And flowing that 140 or whatever you said it was that's not good you want something that flows at 2:20 intake runner You want a closed chamber for high compression those that The head cylinders you want Number 62 13 14 Head There's a lot more than just those ones just a name a few I think the X6 head cylinders are good as well I don't know enough about them but high compression 220 or 215 intake runner flow is what you want to look for like that is what I'd be looking for I'm not a professional but this is what I've been told

@renatosanchez4437 2 жыл бұрын

Hi, my 326 Pontiac of the 1966 start to lost a lot of water of the radiator by exhaust, i can see the leak of water fall in final part of the exhaust, and the radiator gets empty in only few minutes, what do you think it is the problem? 😩😭

@Driven2Compete 2 жыл бұрын

Head gaskets, intake, or a combination of the two?

@scottcapers611 2 жыл бұрын

And ah

@brucefulper2433 Жыл бұрын

I watched the whole. Dear god. Please stop making Pontiac videos. This is embarrassing.

@joequillun7790 Жыл бұрын

😂

@skydive9955 7 ай бұрын

Amen, I’ve been building Pontiac engines for 40 years. Nothing about that 326 makes any sense.. so much I could say but it would take hours to educate 😅