Thread: need a little help from those with experience on sbc drag motor.

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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!

Originally Posted by nitrowarrior

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.

I will say 195 cc's out of a 186 head is not very easy to obtain.
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.....

Originally Posted by nitrowarrior

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.....

Like I said before there is nothing easy about it.
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

see, if it could be done then, it can be done now 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

Originally Posted by nitrowarrior

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.

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.

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?