I am planning on a sbc for my 1/8 mile drag strip Vega. It will use plenty of nitrous so it will all have to be forged. What cubic inch motor will work best and rev very quick for the 1/8 mile? thanks
I am planning on a sbc for my 1/8 mile drag strip Vega. It will use plenty of nitrous so it will all have to be forged. What cubic inch motor will work best and rev very quick for the 1/8 mile? thanks
Since the car is light,you might try a 350 4 bolt main .030 w/327 crank like the old "Grumpys Toy" Vega ran back in the day.
If you can find a good 327 crank or even a 302---you can get spacer bearings to put it in a 400 block
but what ever you use put a 6 in or longer rod in it
Jerry
Torque is still what will get the car off the line the quickest. We ran small inch motors for years in the old Modified eliminator classes- 301's,302's,311's, and had to whang them on the line to 8500+ just to get the car moving, then needing several gears to keep the power band in place, and watching the things scatter parts. It is much smarter to use a bigger inch 350, 377, 383, or better yet 406,434, small block with a glide.
John
406 will be cheaper in long way.
I do like the big cubic inch small block Chevy 406,412,420,434 in an aftermarket block.Quote:
Originally Posted by 41willys
The biggest problem is when you go to big on the cubes you will run out of cylinder head if you use a std. 23 angle head.
Big inch built for torque, not only less parts breakage but IMO much easier to make the car consistent. With that said, the nitrous will negate the less parts breakage point.... Go shopping for a used aluminum big block and a good machine shop to do the block work. Build a ton of torque, leave the bottle in the shop. Probably save you money in the long run.
The first rule of racing (any form of it) is that before you can finish first, you must first finish!!!!!
Going with a aluminum block is definitely the way to go but thats way over my budget at this time.Unless I find a great deal! So what I am getting is that I should go for a 400 or bigger sbc, something like a 421-434,right? Also I know the nitrous is hard on parts ,like any power adder,so I am only going to use it with one of those progressive controllers. What length rods should I use or stay away from ?
Internal Balanced Part
* Crank: 4340 Nitrided Forged Steel 4.000 Stroke
* Pistons: Forged 2618 Alloy Flat Tops 11.7:1 CR w/64cc
* Rods: 4340 Lunati Pro Mod Steel I-Beam 6.0
* Bearings/ Rods & Mains: Clevite 77 'H' bearing
* Balancer: SFI Approved Steel style 6.25 diameter
* Flexplate: SFI approved, 168 teeth
* Balance: High performance street/strip,
* Piston and rods matched +- 1 gram
Any one have any sbc 400's in the southern area?
my buddy has a 406 for sale, fresh just sittin
How fresh we talking, any specifics?
Since 350's blocks are said to be stronger than 400's I wonder how a stock block like this would hold up to the spray. Its not quite the 400+ cubes but still bigger than a 383. How much HP can a stock SBC 350 handle, after its filled ,and splayed?
CHEVY 350CID TO 397CID MONSTER MOUSE STROKER SHORT BLOCK
Will these heads get me too 600 horses?
DART PRO 1 ALUMINUM HEADS,215CC 2.05"/1.60"INTAKE,EXHAUST,1.437 SPRING DIAMETER,STRAIGHT PLUG ,64cc?
it was fired up last year to break in spun a bearing because he didnt prime it. has been cleaned since in an engine bag sittin just needs bearings.
Thats not that big of a deal but is it a 2-4 bolt, filled, what the stroke, cast or forged, you know stuff like that?
What cam, manifold, carburation, etc. There is not a magical number to say that a certain head will achieve a gauranteed number. Combinations work the project from A to Z. Here is what Dart listed as a selling point for a curious buyer.
Thanks nitro I am going to research it . I am not to familar with heads I know more flow= more hp. So I was asking if they would support big hp numbers. I do think that I should use some thing like the 72cc though since I plan to use heavy doses of nitrous????
I wish to show you an engine with factory iron heads (#186 @ 195cc intakes) that produced 660HP. 1800 pound car @ 7.91 Et. Granted your weight and combos will produce a variant of results. Point being, it can easily be done. This is not a clients car, but my play toy to have fun keeping the blood flow going while I was in between events and down time during the season. Second pic is when I decided to go alcohol injection because I had the system sitting aroung collecting dust.
Sweeeeeet!
I will say 195 cc's out of a 186 head is not very easy to obtain.Quote:
Originally Posted by nitrowarrior
This is not your normal port job.
These heads start life at or around 160 cc's so you are making them 35 cc's larger.
To make 660hp using factory heads is not that easy.
I can see welding material on the top of the ports to make them taller and then doing a bunch of machine work.
Erik, when down time has a person fidgeting, you get either creative or stupid IE; water jackets etc. It was achieved and it did go for three seasons with my shop buddy driving it when I was out and about. Like some blocks can stand an excessive bore, some heads can be squeazed a bit, call me lucky because I know I was with these heads. It's all fun even when you go oops!.......You know we can't stop going too far.....:LOL:
Like I said before there is nothing easy about it.Quote:
Originally Posted by nitrowarrior
I also don't want any-one to try it because these day's you can buy bare castings with a 230 cc port volume for less than $700.
You will be money ahead also using new castings.
Oh, I forgot to add this was way back when heads, compared to today's availabilty were not present. So, as all "Dummies" will do, we push it and make it work as best as we can. I wish today's products were available back then.....how sweet would that have been?
I wasnt even thinking of the heads , I said sweet after seeing the front engine dragster. Love them things:toocool:
see, if it could be done then, it can be done now:D btw BTD its a 2 bolt non filled was just going into a 68 impala daily driver, has dish pistons its a stock crank so probably cast. but the block is good and read to go. thats all i know. you know me i play with the itty bitty's :D
Will I got a set of the Dart 1 alum.heads good to 700 lift, 215 cc intake runners, angled plug and 72cc's. From what I get 350 blocks are stronger than 400 so I am looking at getting a 383 from a 350 block. Any ideas on a combo? I found this one which brings me close.Quote:
Originally Posted by nitrowarrior
Combo 15 uses a 383 cu. in. engine with 9.5:1 compression and a 750 double pumper. With a 280° hydraulic camshaft and the AFR 190cc Street heads, this combination makes an awesome 471 HP and an incredible 515 ft-lbs of torque. This is the ultimate street engine.
Displacement: 383 cu. in.
Carburetor: Holley 750 double pumper
Heads: Air Flow Research 190cc Street
Intake: Air Flow Research FloPower RPM
Camshaft: Comp Cams 280° Magnum hydraulic, with 280° of duration, 230° of duration @ 0.050 in. lift, and 0.480 in. lift
Headers: 1 3/4 in.
Distributor: MSD
Timing: 34°
Comp. Ratio: 9.5:1
MAX HP: 471 @ 5500
MAX Torque: 515 @ 4500
I have the Dart heads , 1 3/4" headers , all msd ignition from dist. to 6al box. I have a 280 H comp cam complete kit and a complete nitrous "cheater" system good to 250 extra hp. What can I move around to get full use of the heads?
I like that you're going forward with this attitude. Remeber the Webbing in a stock block 350 is what they are talking about. You wish to use a 400 block? Stay with the 509 block. Strongest and very lite for the factory production blocks. Then you can play with cubes and camming and all kinds of combos.
I would like the 400 block but just here so many negatives about them.
The negatives come from the assumptions that they're junk. A 509 block has 13% more nickel in it. It has a wider contact surface on the main caps to help slow down cap walk compared to the standard cap. It weighs 11 pounds less than the standard 400 block. I guess you can run what ever you wish to run. Keep doing the research on what it is that you are trying to do with your baby.
Ya , I would definitely like more cubes. How much hp can a "509" block handle, splayed,and filled? I am finding that to get the most from these heads (Naturally Aspirated) I could go 400 with forged parts and short stroke and spin it to 7000 grand??? How much does nitrous change the game?