Go for it!Those Heads will do all you want!!!!!!!

Later
G

 

My 475 bbc is at 675hp. 13 to 1 pistons solid roller cam, gasket matched , and 2.25" intakes. you should be good with the right cam. i do not know what my heads flow,im guessing less than 325

 

Any BBC O.E.M. iron head with a 2.250 intake and a little bowl work will flow well over 330 c.f.m. plus. Now work over the short turn and open up the rest of the bowl, you should see over 340 c.f.m. plus.

 

Built several way back,Any where from 625HP to 750HP,Cams from 256 to 272 ,CR from 12.0to 13.8,Just some selective porting and engine build 101.Bill C.

 

Thanks for the reply's!

So they will need to have the 2.25 intake to make 650HP?

I can't find the cam card, but the cam I currently have is a Crane solid roller with .660"/.680" lift. I don't mind buying another one to get to the 650 goal, but that's what I have now.

 

Here is my cam, that I used back in the day with 990 heads, Crower roller X7270 int op @ 19 cl @51 exh op @ 64 cl @ 16 250* int dur 260 exh dur int lobe .392 exh lobe .362. It was killer in my heavy ass Chevelle.

Maybe some experts could give you a better grind. I hope this helps but 650 out of 990 heads can be done.

 

agree with post # 4....as a basic race engine... maybe minor port cleanup...

and then,

lots and lots of them in very basic DUALLY -TRUCKS...
to pull race trailers ..ETC...
some have the 4 .125 cranks in them.. and run well

THEY DONT COST ANYTHING.....in comparison....

 

Shouldn't be a problem.I had a 468 with 990s,with minor port work ,2.19 & 1.88 valves, solid flat tappet cam 12-1 compression that made right around 650 hp. Good luck

 

Match your cam to the 990's they are the rect port head right ? they will make your HP goal of 625... 2.19 intake will support a 454 ci and 6500 rpm bigger or higher rpm you may need bigger valve ......... get a cam matched to heads flow rate and yes some minor bowl work is all you need IMO

 

Good to know! Yes, 990's are rectangle port.

And thanks again for the reply's

 

Had a friend that was class racing in dirt, HVH did work on those 990 heads and many more trick things, it made over 850HP, so anything is possible.....

 

WOW! :shock: Guess I could step it up a lot if I want too, lol.

 

There is a truck around here that has 990's 479ci, 4150 carb and 1 7/8" headers that was just shy of 900hp. Reher-Morrison did the motor. Runs pretty good, just likes a lot of rpm. So anything is possible.

 

There is a truck around here that has 990's 479ci, 4150 carb and 1 7/8" headers that was just shy of 900hp. Reher-Morrison did the motor. Runs pretty good, just likes a lot of rpm. So anything is possible.

Brown chevy?

 

Have the 990's been ported already? If not are you planning on porting them yourself?
Are they fresh or are you going through them?
Those heads can easily meet your needs, I would just look at whats out there in a used aluminum head before I sank a ton of money in the 990's
That barge is heavy enough already!!!
of course if the 990's are ready to rock and just need a little cleanup...you are there.

When you get to that point, let me know what length pushrods you need. I ordered a couple of wrong sets of manley .080 wall deals. Maybe you can use a set. I also have aluminum pulleys for a long water pump if you need them

You almost ready to get that thing going down the track?

 

red barn, I got the valve train back from the old 468 out of the Nova I had. And of course I'm not going to port them myself, lol. I don't want to port them anyway. This is another one of my "budget" engines. Only this time it's a Chevy, lol. And as far as more weight, I've got 10lbs. of Bam Bam to offset that

The small block and trans are ready, and I just finished up the 12 bolt. I don't know about ready, but it should all be in one piece in about a month. Still need to wire it and get some fuel system pieces.

 

That truck is definitely stout...

 

http://www.youtube.com/watch?v=c-dAP1Kmz-w&feature=player_detailpage It's the last truck in the video. The orange truck did a little over 750 at 7400rpm if I remember correctly. So a lot can be done with the heads but sometimes is not worth the money.

 

What intake did he use?

 

I wonder if I can get him on here...lol