View Poll Results: what should i go with
350 small block
14
27.45%
400 small block
37
72.55%
Voters: 51. You may not vote on this poll
400ci or 350 ci???
06-18-2002, 05:35 PM
#1
Supreme Member
Thread Starter
Join Date: Dec 2001
Location: boonton, NJ
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
Car: 84 camaro Z28
Engine: 434sbc
Transmission: powerglide
Axle/Gears: moser 9" with 411 posi
400ci or 350 ci???
well what do you guys think i should go with:
350 small block or 400 small block
please any suggestions would be great.
350 small block or 400 small block
please any suggestions would be great.
06-19-2002, 09:02 AM
#3
Senior Member
Join Date: Oct 2001
Location: Stevens Point Wisconsin
Posts: 674
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1991 Formula
Engine: 350 firebreathing inches of Small Block Chevrolet
Transmission: A 700R4 that has trouble handling the formentioned 350.
If you use the stock heads or any heads designed for a 400 the steam holes will already be in the heads, so don't let that scare you, plus the holes are easy to drill.
The 400 is the way to go.
The 400 is the way to go.
06-21-2002, 11:45 AM
#4
Supreme Member
Join Date: Sep 2001
Location: MN
Posts: 1,355
Likes: 0
Received 1 Like
on
1 Post
Car: 2009 Pontiac G8 GXP
Engine: LS3
Transmission: 6L80E
Axle/Gears: 3.27
400's don't overheat without the steam holes...both my friend and I have 406's and with a combined 13 years of both engines on the street...under all weather/driving conditions (except snow), we have had no problems...
Except recently, when my friend was racing someone on a long lonely stretch of road and he had it pegged at 6,000 rpm for about 3-4 minutes, then turned off and shut it off quick in his garage, his coolant boiled over...can't figure out why
That is what happens with a Turbo 350 and 3.73's...top speed of about 125-128...he needs overdrive
This story is not an example of overheating...cause it didn't and runs fine....
Except recently, when my friend was racing someone on a long lonely stretch of road and he had it pegged at 6,000 rpm for about 3-4 minutes, then turned off and shut it off quick in his garage, his coolant boiled over...can't figure out why
That is what happens with a Turbo 350 and 3.73's...top speed of about 125-128...he needs overdrive
This story is not an example of overheating...cause it didn't and runs fine....
06-22-2002, 10:43 PM
#5
Member
iTrader: (1)
Join Date: Dec 2000
Location: South of GR, MI USA
Posts: 221
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1971 Corvette
Engine: 6.0 LS1 L92 heads sheet metal etc.
Transmission: M21 4-speed
Axle/Gears: 3.36
Duh, more bigger equals more better. my 406 doesn't overheat without steam holes either, but i would have drilled them if i noticed they weren't there. it was 93 today and it runs wherever i set the fans to come on. i like to run it between 180 and 190.
06-22-2002, 10:47 PM
#6
Member
Join Date: May 2002
Location: Olympia, WA
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
My dad did a 400 in his 87 Montie SS. Dart heads, dynomax headers full quiet exhaust, edelbrock intake, 750 holley. Runs 12.80 with some more tuning to go. I am not sure how big his cam is but it idles good.
Rich
Rich
06-23-2002, 09:34 PM
#7
Member
Join Date: Apr 2002
Location: Selinsgrove, Pa, USA
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Car: 92 Camaro RS
Engine: 355 94 p/u motor
Transmission: 700R4 With TCI kit
400's are a Good motor, easily a 12 second motor with little work done. As long as your gonna stay carbuerated, go 400
Trending Topics
07-01-2002, 11:57 PM
#8
Junior Member
Join Date: Jan 2002
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
im currently building up a 400 its supposed to be about 450 hp they sound like a really great motor ive heard mixed opinons on the holes needing to be drilled into the heads. really theres no replacement for displacement. and dont let anyone talk ya into that 377 garbage if you have a good 400 go with it why reduce cubic inches. good luck man chevy's rule
07-03-2002, 01:10 PM
#9
Member
Join Date: Jun 2002
Location: Parsippany,New Jersey
Posts: 434
Likes: 0
Received 0 Likes
on
0 Posts
Car: '86 Trans Am
Engine: 350
Transmission: TH700R-4
Axle/Gears: 10 bolt 3.73
350 has more potential and you can't rely on those 400 castings to hold up to a .30 or more.
but the larger bearings are nice.
but the larger bearings are nice.
07-03-2002, 09:32 PM
#10
Supreme Member
Join Date: Sep 2001
Location: MN
Posts: 1,355
Likes: 0
Received 1 Like
on
1 Post
Car: 2009 Pontiac G8 GXP
Engine: LS3
Transmission: 6L80E
Axle/Gears: 3.27
Actually, you can bore a stock 400 block to .040. Don't go more than that...
And drill the steam holes. That is why 400's have a reputation for overheating, because people didn't drill the holes in the 350 heads that they swapped on.
If you understand the siamese cylinders, you will see why the holes should be there. I can vouch for 3 seperate 406 engines with steam holes that have no problems with overheating on the street. 150K between all three so far and counting.
And drill the steam holes. That is why 400's have a reputation for overheating, because people didn't drill the holes in the 350 heads that they swapped on.
If you understand the siamese cylinders, you will see why the holes should be there. I can vouch for 3 seperate 406 engines with steam holes that have no problems with overheating on the street. 150K between all three so far and counting.
07-06-2002, 02:11 PM
#11
Junior Member
Join Date: Jan 2002
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
Amen to that,88TPI406GTA hit tha nail right on the head if you want to avoid overheating drill steam holes into the heads that is the biggest concern with overheating. as far as i was talklin about the 377 i was talking to a buddy at work that has one and he says its a piece of $hit till he gets to 9000 rpms. http://www.ryanscarpage.50megs.com/combos14.html combo 101 shows a 406 487hp at 5500. not a bad setup,no replacement for displacement. get your steam holes drilled in the heads and go with the 400.
07-09-2002, 04:18 PM
#13
Supreme Member
Join Date: Nov 2001
Location: heartland
Posts: 2,743
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89rs (previous 2.8)
Engine: 406
Transmission: 700r4 (for now)
If you go with aftermarket heads (wich you should) the steam holes are usually there....otherwise all it takes is a1/8" drill bit..match the holes to the gasket.
07-09-2002, 07:48 PM
#14
Senior Member
Join Date: Apr 2002
Location: Massachusetts
Posts: 664
Likes: 0
Received 0 Likes
on
0 Posts
Get a 350 and stroke it to a 383. I just put a deposit on this setup tonight (see sig). It desktop dynos at 580HP and 523 lbs TQ. You can afford the best of parts with a 383 but a 400 can get costly.
07-09-2002, 07:57 PM
#15
Supreme Member
Join Date: Nov 2001
Location: heartland
Posts: 2,743
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89rs (previous 2.8)
Engine: 406
Transmission: 700r4 (for now)
Thats a tough 350...you'll have to let us know how it dyno's in the real world.
Are you building this for dual purpose? Pretty high compression for pump gas. But what do I know....only a little.
Are you building this for dual purpose? Pretty high compression for pump gas. But what do I know....only a little.
Last edited by Riley's35089rs+; 07-09-2002 at 08:00 PM.
07-10-2002, 07:56 AM
#16
Senior Member
Join Date: Apr 2002
Location: Massachusetts
Posts: 664
Likes: 0
Received 0 Likes
on
0 Posts
I am going to drive it on streets occasionally. I will be able to get away with pump gas because of the lumpy cam. Its a roller cam with the dur @ .050 248/252 and lift .606/.585. I already went over this with the engine builder. I wanted to go as high as possible with compression but still be able to use pump gas.
Thread
Thread Starter
Forum
Replies
Last Post
