400 sbc???? (All assembled)

[4X4HIGH]

350 with 400 crank = 383 btw. Both blocks have different bores. 4" vs. 4.125"
also a very good plant
when it comes to heavy vehicles, stroke is king IMO


YO Deulling, make sure we get an update ASAP when the motor is in.

Actually, a standard bore 350 block with a 3.75" stroke crank (400 crank) is a 377, if you bore the 350 block .030" and add the 3.75" stroke crank THEN it becomes a 383. Also if you bore the 350 block .040" it becomes a 385 and once again if you bore it .060" it becomes a 388.

 

[jwilson76]

Well im not gettin it machined, the guy thats building it and selling it to me is. He just sent me those last night after he said i would probly want a little more cam than stock, and he said both of those run very well in a 400. I just thought you guys might know more than me on which one i should spend and not kill my pocket anymore than i have to.

And i just looked at some forum stuff on those sites about the cam. They all are running strip cars mostly with different heads and going all performance. I will rarely rev this thing very high, and im not looking for a 12 second car or 500hp lol.

The point of searching the sites was to give you a better understanding of how most off the shelf cams are the same no matter what the box says. If your going to buy an off the shelf cam the company selling it to you doesn't matter for the most part because they didn't grind it to begin with, so pick a combination that you like and go with it. Check out this specific thread:
http://speedtalk.com/forum/viewtopic.php?f=1&t=24170&hilit=cam+differences+camshaft+manufacturers

 

[TDAWG1]

I Love this Conversation.

 

[84 k5 blazer]

Subscribed...I want a 400 also.

 

[shady]

Well i just went on a 145 mile trip and took 15.2, driving slow, thats 9.5.
If i had power to back my bad mileage up, i would be happy, but this thing has nothing, so if i get 9, 10 with tons more power, i will be very pleased.

I'm not sure where you got the 145 from but if it was off the odometer its wrong. Your 32's are 3"taller than the 235/75's that probably came stock on there. that will give you less miles on the odometer than you actually traveled. try it with a gps once to give a more acurate distance traveled. have to do it on a trip though, in town would be a pain. your most likely getting better than you think.

 

[Deuling]

Good thought, im sure it is slightly higher, but its 11 miles from my house to work and Its pretty darn close to that on my odo.

 

[Deuling]

Subscribed...I want a 400 also.

 

[Deuling]

I Love this Conversation.

I know right, shows how little i know about engines haha.

 

[Deuling]

I'm running one of the Comp 4x4 cams in my 350 (12-235-2, top of the list sweetk30 linked to). I've been impressed with it. It has about the same lift as that Summit 1103, but definitely not as much duration. It idles smooth though.

I'd think about getting more cam than that 1102, and going with the 1103 if you're set on a Summit cam, otherwise there'll be some power on the top end you'll miss out on. That Performer RPM intake will do just fine. I never thought I would spin my 350 above about 4k, and the first time I hit some mud at WOT I saw why it was a good plan to to have a powerband up to 5-5500rpms.

I don't have much personal experience with 400's, but as far as the overheating goes, I say run it. GM offered it for 5 or 6 years in the K5's, and I've got a buddy with a stock one from '78 that's still running strong. Maybe it's not the best design ever, but if you've got a decent cooling system on a fairly stock motor, I wouldn't worry much.

My $.02.

Ok well i will look around, any problems with the vaccuum for the breaks with them?? THats really what i dont want. Ive heard big cams = no brakes at idle.

 

[Deuling]

YO Deulling, make sure we get an update ASAP when the motor is in.

Oh don't you fret about that lol. I will get on the day its in with lots of pics and everything. Idk if ill put them on this thread or the one for my truck. Most likely both haha. Maybe a video of the first burn out, and my boss has a nice hill in his woods i could hit up.

 

[StevoandaRedK5]

Ok well i will look around, any problems with the vaccuum for the breaks with them?? THats really what i dont want. Ive heard big cams = no brakes at idle.

I'm running factory brakes (Disc front/drum rear, factory booster and master) and I can lock up my 35's and slide on dry pavement. Easily hold the truck in 4lo pointing downhill. It's my understanding that you need a really radical cam profile to have such a lope that you lose vacuum at idle.

 

[Deuling]

I'm running factory brakes (Disc front/drum rear, factory booster and master) and I can lock up my 35's and slide on dry pavement. Easily hold the truck in 4lo pointing downhill. It's my understanding that you need a really radical cam profile to have such a lope that you lose vacuum at idle.

Ok cool thanks man. I just didnt know about it so i figured i'd ask.

 

[StevoandaRedK5]

Ok cool thanks man. I just didnt know about it so i figured i'd ask.

That's the beauty of the CK5 Brotherhood, as opposed to somewhere like Pirate. Just ask away mang. I'm just a young 20yr-old dude like you, and I've learned more from this site than I know, and usually from the search feature and not being afraid to ask.

 

[Deuling]

That's the beauty of the CK5 Brotherhood, as opposed to somewhere like Pirate. Just ask away mang. I'm just a young 20yr-old dude like you, and I've learned more from this site than I know, and usually from the search feature and not being afraid to ask.

Oh yah i like questions lol. I think the plumbers at work get annoyed because i always ask random questions about plumbing and stuff while doing it, but i just like to know things. My gpa always says, they can take everything away from you in your life, but they can never take away an education.

 

[82355]

None of the cams you have suggested or even ones slightly bigger will have any effect on your brakes.

Martin

 

[shovelbill80]

are you going to modify your exhaust to accommodate the extra 103 inches?

 

[jekquistk5]

I would hope he would pick up some long tubes, and ditch the manifolds. No need to suffocate the engine.

 

[63chevyll]

This is the cam I ran on the most recent 400 I built, the only difference is We ran Vortec heads on it. and -20cc pisctons and 5.7 rods

http://www.summitracing.com/parts/CCA-CL12-239-3/

it worked well here at this elevation

76 Chevy, It was a stock suspension, 32 inch tires, 3.73 gears 1/2 ton

Next engine (400w/vortecs in a 4x4)I build im using the same cam, Very pleased with it

 

[Deuling]

are you going to modify your exhaust to accommodate the extra 103 inches?

Well im hoping to run 2.5 inch back then IDK about true duals or Fakes, but to 3" Duals out the back. WIth FLowmasters.

Oh yah and my buddy has some headers from a 350 he said he would dig up for me, slightly used, he didnt say a price but prolly not too much. SHould fit right? Or no.

 

[Deuling]

This is the cam I ran on the most recent 400 I built, the only difference is We ran Vortec heads on it. and -20cc pisctons and 5.7 rods

http://www.summitracing.com/parts/CCA-CL12-239-3/

it worked well here at this elevation

76 Chevy, It was a stock suspension, 32 inch tires, 3.73 gears 1/2 ton

Next engine (400w/vortecs in a 4x4)I build im using the same cam, Very pleased with it

Yah unless i hate the power or something or have problems i wont have vortecs so idk if i feel the need to spend $200 on that one, idk lol. Lookin for decent but not too pricy, I know its not really an option on high performance engines, but thats not what im getting really.