622 bbc
 

what do the experts think of this combo?

4.75x4.560
dart big m heads
13:1 comp
sheet metal ram, 6" tappered runners
2x 1190 DR Demons
110 lobe
270/280
790/750
vac pump

should it crack the 1000hp mark?

cheers.

That combo shouldnt have any problem cracking the 1000hp mark IMO

If you cannot hit 1000 hp with that, you better take up a new hobby...... :lol:
I dunno about the demons though.....not my carb of choice....

i have a 622...little bigger cam...i also have big chief heads 14 degree,,,worked to the max...EPD sheet metal intake,,,dry sump..pair of 1200 chuck Nuyghtten dominaters..
and it made right at 1200 hp..and well into the 900 TQ range

so i would say no doubt yopu will be all over 1,000 hp

BigM heads usually need a bunch of work from what I have seen just to make run right....not darts best work thats for sure.....
I would look into some BMFs or Profilers for my dime if your stayin conventional....

or did what I did,buy some big chief pro 1s and have them opened up
to match your CID -

I had a set of big m's on a 548 they were the pro-mod ported from dart. I took them off and put a set of cnc'd dart 355's on and lost .05

I think the Dart Big M is a great head for your combo, .
I've made TONS of power with them but they do need a little
porting to clean up the bowls etc.

It should crack 1000hp without much problem, .

Curtis

622 bbc
 

the heads are big m super mod, 420@ .850, i will take them out to full polish specs of 433@ .850.
what octane fuel will be needed with this combo?

1st off i am a Sunoco Dealer and Ex VP fuel dealer.


the octane rating is conssdered only to combat detonation due to high compression.

if your motor is 13.1..then 110 octane would be fine..and if you wanted to add a little room for safety then the 112 supreme would be more than enough..
DO NOT use pump gas with your combo..

Brian

say i went back to 11:1 comp and 100 octane pump? what would be a ball park hp figure?

rob

622
 

give you some truth to your set up the comp is to low for such a deep stroke. You will still make around 800hp but you will not be getting the best out of this set up. Better you go with a 555 and make 900 and the motor will run clean. Deep strokes need a lot of comp trust me I was were you was at and I had to see Mr.Sonny $8,500 later now the engine is right do it right once not twice.

You have almost everything to make 1000hp. That number isn;t as easy to make as most guys think. 1000REAL hp, not inflated advertising numbers, but in the real world. The cam for sure is to small, it won;t make that powewr with that cam. I use 270 at .050 cams on some pump gas 509's. Its a BIG engine, and it needs a BIG cam. Something like 286-298 at .050 with as much lift as you dare. But for sure you need something in the .800+ range. The heads will make that power easily.

I have made 1129hp and 985 ft/lbs on a 598 injected on alky with a ported Dart tunnel ram with those heads. 1000hp is not a big deal, just lighht on the cam

Frank
Advanced Performance
www.get-ap.com

I had a custom cam ground for my 572 (4.5x4.5) Ford with TFS A460 heads and its quite a bit bigger that yours, 284/[email protected], .816/.780 114 lsa. Heads are ported and its getting a 12-71 so I would think your motor would need alot more cam being that its a 622. Chris

You really didn't give us enough information for us to give you or best advice; like what do you plan to use this engine for? If it is strickly for racing why would you even consider less compression. Also the centerline of the camshaft is going to make it very difficult to degree it in when working with the 4.75 stroke; you would be much better off with 116* centerline. The heads and advice about them depend on what type of use, Nitrous or not, and etc. This is true for the whole engine combination.

What state are you from? We build engines if you want professional advice.

Good Luck.