Never heard of that one before.

I think you are gonna come up 2 tenths short with any of those combinations And to get those 2 tenths will be expensive and hard to do. I have been in that type of deal myself. I found out trying to run 6.0 cost a lot more than 6.50 at 3750 lbs.I watch the purses. If 7.0 pays $2000 and 6.50 pays the same, whats the use. Unless you just really want to go faster If you can find a safe way to make the car 200 lbs. lighter it would save money. I am not downing your combo in any way, Just matters where you want to fit in. I am interested in how this turns out for you I never learn enough There is Nitrous. Try a 50 HP shot

The car weighs around 2800 with me in it. That's about 900 lbs lighter then your 3750. Do you think I will be still 2, 10ths to slow?

quote:

Originally posted by Novacaine:
I have a 454, 12.5 comp and a 718/722 roller camshaft. Dur @ 50 is 269/281. Im putting in a vega. Its a big tire, powerglide,5.13 gear. I have a couple sets of heads but not sure to run these or get another set. I don't want to spend a lot for heads.
1= 188 cast heads, 2.25/1.88,
2= brodix bb2 plus 2.19/1.88,
3=049 cast heads 2.19/1.88,
none ported.
All of these don't seem to flow good numbers.

I would like to run 580/590 in the 1/8. I think the vega weighs 2600 with a sbc steel heads.
I had the same 454 engine with the brodix heads in a nova that weighs 3000 lbs and it ran around 630/640 in the 1/8.

I have a couple other cams kind of close in lift,
Bullet, 726/720 276/284.
comp 748/714, 276-284
bullet 268/276, 724/722 lift.LS 110, advance to 106.
RPM no more then I have too. maybe 7000 7200

This says you want ET, not MPH and don't want to turn much more than 7000 RPM. Then you want to use the 049 heads which someone already upgraded by putting 2.19/1.88 valves in. These heads with your smallest cam at .050

268/276,
724/722 lift
LSA 110
106 intake centerline

Will give you your best chance at the 5.80-.90 ETs you're looking for.

If the budget allows, get the heads to someone that knows what they are doing and have the bowls blended and gasket match the ports.

FYI, this 11:1 468 with 215 cast iron oval port heads, a 254/260 @ .050 roller cam and a 4150 carb made over 700 HP based on weight/ET/MPH.



and when I retired this combo at the conclusion of the 2007 before selling my former Chevelle at the end of the 2008 season, there wasn't a BBC 468, 502, 509, 540 in a Chevelle running in NHRA Division 1 brackets that I didn't have covered by tenths, despite that fact they they all had more compression, bigger aluminum heads, bigger cams, dominator carbs and bigger headers. and they were all hundreds of pounds lighter than my 3880 lbs.

Being the vega is about 900lbs lighter would you use a 4150 or a 1050 dominator? I have both.

the dominator should run 1 to 2 mph faster depending on how good each carb is. You need to test with both.

I run E85 and can test both.

So 049 and bowl blends and gasket match. For around 7000 rpm. If I was to turn more say 7500 would you still run 049 or the 188? Just a thought?
By the way the 049,s have 3/8 valves and the 188 has 11/32.

for your goal, my advice is the cast iron 049 heads.

Nova caine yes you said it would be about 400lbs. difference between your 2 cars. My Nova is not as fast as yours. I also have full exhaust with huge magna flows. My car is still a true street car. tagged etc.You know how it goes fast cost money. How much do you want to spend `I run steel square ports.very lazy 60 ft. But I planned on using a lot of nitrous. then changed my mind. So my engine is not matched correctly. Only 9.9 compression. Will run on 91 octane all day. I run a big solid roller too. I personally like oval ports better unless using a power adder. If I was you I would use the oval ports and a RPM intake with a 850-930 Holley. I don't like dominators. Unless maybe 800 or more HP. JMO. I have seen many fast cars with an 4150 carb. You might find the 2 tenths by sweat equity.

1320 racer is right. With that gear and a dominator, 6000 plus converter should put you well in to the 5s. That much gear it will e.t. A 950 alky carb would also be a great choice

If I was to buy a new camshaft would would you recommend? And would porting the heads help too?

quote:

Originally posted by Novacaine:
If I was to buy a new camshaft would would you recommend? And would porting the heads help too?

Stop going in circles, chasing your tail! You are on 3 websites (minimum) with your project.

You have been given good solid advice for your set-up here. Run the set-up as outlined earlier by 1320ricer. If you are good tuner with E85, that's going to be a plus. If you have never used it, you might as well learn/start with Methanol.

I wish you the best of luck with your project!

I'm only on two web sites, and I have been running E85 over 10 yrs now. But thank you for your comments.

quote:

Originally posted by Novacaine:
If I was to buy a new camshaft would would you recommend? And would porting the heads help too?

porting as a whole today is one of the biggest wastes of money with what we do. That said, I told you what to do with your heads. As for the cam, use what you've got.

Okay thanks

1320 is right about heads for what we do. For a class racer whith a dedicated head probably for sure on port and flow. The cnc heads avilable off the shelf today are dam good. That being said, again as 1320 racer stated you will et with that head. In my old Vega 2700lbs,468, 4.56 gear, 32 tire,950 alky carb, 1.80 first gear powerglide. This combo ran 5.78 in cool weather and 5.80-81 in warm weather.

Im going with the 049's bowl blended and gasket matched. And the cam I have and go from there.

quote:

Originally posted by Novacaine:
Im going with the 049's bowl blended and gasket matched. And the cam I have and go from there.

I think you made the right choice! What's the timeline to get the car on the track? I would like to tune-in for the results.