[nh68gto]

Hello.
So shifting gears from body work, ( shop not in budget right now).

Wanting to freshen up the motor a bit without getting crazy. Let her breath better and get some more power.

Set up is stock YS 400 with 62 heads auto trans W/ ac, power disc brakes 69 GTO.

Thinking cam, lifters, rockers, chain, reseal motor, valve job? Not sure how far or how basic to do it. Have no idea what to get. Would like a bit of that stumble from her.

Thanks in advance for helping!

[77 TRASHCAN]

How good, or bad does the engine run now?
Does it use oil?

[nh68gto]

Ran good idle was fine and good pressure. But at same time car was bought running driving, and started disassembling shortly after. I have no road time with the car...! Thought project would have moved faster but here we are many years later ,..

[ponyakr]

Don't think anybody would recommend a cam smaller than an 068 clone, such as a Melling SPC-7. Might be the biggest cam you should consider, if you wanna use stock valve springs.

https://www.autozone.com/internal-en...07135_705947_0

The Summit 2801 is similar, but with more lift. Also about the cheapest cam you'll find.

https://www.summitracing.com/parts/sum-2801

Most would not recommend a cam much bigger than a Summit 2802, for a mild street 400.

https://www.summitracing.com/parts/s...RoCJdgQAvD_BwE

A Lunati 10510312 is somewhere between the 2 Summit cams mentioned.

https://www.lunatipower.com/street-m...8-276-286.html

A Crane 283951 is similar to a Summit 2802, but costs more.

https://www.summitracing.com/parts/c...IaAusEEALw_wcB

A Crower 60243 is even bigger & costs a lot more.

Then, some like the Voodoo cams in most Pontiac HFT apps.

https://www.lunatipower.com/voodoo-h...8-262-268.html

"...Would like a bit of that stumble from her..."

Stumble could be from carb and/or ignition. The correct tune & operation of both, can make a huge difference in performance.

"...Thinking cam, lifters, rockers, chain..."

I bought Jegs lifters, cause they were cheap, & made in the the USA by Delphi. Some recommend nothing but Hylift Johnson "R" lifters. Hylift Johnson also makes some slightly cheaper lifters.

The Cloyes C-3007K timing set is about the cheapest decent set there is.

https://www.ebay.com/itm/Engine-Timi...ss!71251!US!-1

Some prefer the Melling 3-350S set.

https://www.ebay.com/p/Engine-Timing...-350S/75561005

The CC 2112 is a basic double roller set. But it's not a true roller chain.

https://www.ebay.com/itm/Comp-Cams-2...9238c782575de3

Here's the basic Melling DR.

https://www.amazon.com/gp/offer-listing/B001T8H1IG

[ta man]

I take it you meant rumble not stumble?
If you want stumble a E Carb will do the trick!

[ponyakr]

Originally Posted by ta man

I take it you meant rumble not stumble?
If you want stumble a E Carb will do the trick!

Thought you wanted to get rid of the stumble, not add some rumble.

I'd think most any cam bigger than a Summit 2801 will add some rumble to a 400.

If you wanna stay with low lift, a 744 type cam such as a Melling SPC-3, will add a little rumble, without increasing lift. But, usually, when you add rumble you lose some low rpm vac & torque, & move the power range up on the rpm scale.

https://www.ebay.com/itm/Engine-Cams...0b5be367860180

[shaker455]

Dominic?

[77 TRASHCAN]

Originally Posted by ta man

I take it you meant rumble not stumble?
If you want stumble a E Carb will do the trick!

Ernie, any more racing for you, Andy or Chris this year?

[ta man]

Originally Posted by 77 TRASHCAN

Ernie, any more racing for you, Andy or Chris this year?

I hope so very soon, haven't been out this year. I will either add to one of my threads or start a new one when I do. Good or bad results!

[nh68gto]

Originally Posted by shaker455

Dominic?

Yes sir !

[389]

Nunzi 2041N.... If not then a factory 068 or the 2801.. Don't fall for the long duration kool aid unless its a track only car.. On the street, you need power NOW. Having to rev up to get it will make driving that car a chore.. The fact is I've made that mistake more times then I care to remember..

[HoneyHush]

What is the rest of the drive train going to be? One of the most important components in my opinion is the torque converter. You have to decide what you want there kind of first. Example; my brother built a 68 400 #15 headed 400 for his firebird when we were teenagers. Put a 68 4 barrel on it with a worked up q jet and a 744 cam from ho enterprises I guess it was, with a set of hooker headers, 2 1/2 exhaust and a 3.08 gear. Just a shift kit in the th350. The car ran really strong everywhere except from a dead stop or extreme slow roll. He swapped the stock torque converter out for a 2500 stall from Summit and it was a totally different car, would literally turn the car sideways from a dead stop with ease where as before it bogged and took a hundred or so feet to really take off. First lesson of how important a stall converter is.

[nh68gto]

Need a trans, so that can be done to what’s needed.
I get not going to radical, just want to freshen it up with some “thump”
I know someone been in it at some point. Just don’t know when or what was done.

[ponyakr]

"...with some “thump"..."

068 & 2801 are not gonna give you any "thump", in a 400.

Will probably take at least 220° duration @ .050 lift to provide much noticeable "thump".

The Lunati 10510312 is one of the smallest cams I can think of, in that range.

https://www.lunatipower.com/street-m...8-276-286.html

The 262 Voodoo claims a "choppy" idle. Some here like Voodoo cams above all others.

https://www.lunatipower.com/voodoo-h...8-262-268.html

The Lunati version of the 744 should provide plenty of thump. But, it will have less low rpm torque, and will require a higher stall converter. I don't recommend it.

https://www.summitracing.com/parts/lun-10511004

This Comp Cams Thumpr will definitely give you some "thump". BUT, it may NOT be very streetable, in a 400. Would definitely need a loose converter. It's designed specifically to give more thumping sound. Don't think ANYBODY here would actually recommend a Thumpr. I wouldn't buy one & don't recommend it. Just tellin you what's available.

https://www.summitracing.com/parts/cca-51-600-5

Here's a possibility which I haven't mentioned, on the bigger end of what I'd consider really streetable. Would definitely need enuff converter. Will need correct springs for whatever cam you choose.

https://www.summitracing.com/parts/hrs-410141-12

[jamaca85]

well without saying much.the answer is......Yes you are...thanks

[HoneyHush]

https://youtu.be/zlihDbCctH4
https://youtu.be/G3dfDo8MeGc
https://youtu.be/mOLTAkAW9q4

Here is my car while I was putting it together and painting it. This is a 68 wt code 400 out of a gto with the 16 heads and stock intake. Nothing is ported or gasket matched. The lunati 744 cam with 420 lift and 220/228 .050. Cliffed up qjet. Th350 with around a 3000 stall just because that’s what I had, but you will need a bigger than stock stall. Small tube headers with 3inch mandrel exhaust, x pipe from jeggs, magnaflos. 4.10 posi 8.5. Nothing crazy but still really fun to drive with no loss of bottom end torque! Lol. Haven’t ran it because I sold the engine to my brother for his 68 lemans but similar set ups in the past and how it felt would make me think 12.70s. Hope this helps. I’ll try to find the “idling” video

[ponyakr]

Originally Posted by jamaca85

well without saying much.the answer is......Yes you are...thanks

[nh68gto]

So I’m not the only one confused..