I was able to get a deal on a 500 stroker Motor from MP, I need a carb they say a 850cfm works best, Which one would you use? Its goin in a 1968 Satellite weighs 3800 with me in it. I have a 4500 stall or I can use a 2400 stall converter, its 509 lift 248 duration 9.1 compression, so anyway which 850 carb? Holley Proform BG?

What heads are on this thing? , 9.1 CR sucks with alu heads , burn speed is too slow which will cause sooting @ low speed , idle/transition circuit will be a mare to tune , spark lead could be anywhere between 40*/50* .

I don't know who assembles the wedge crates, but I can tell you from experience with a Cummins built Hemi crate that Stevie Wonder, working in a barnyard, could do better work! Like Brad said, tear it dowm and check everything! That said, the Holley HP950 is one of the best performing, out of the box street carbs for these strokers. I have used several and been very pleased with the results.

The heads are High Flow iron Stage V heads 2.14 intake 1.81 exhaust. Well has anyone ever actually had terrible luck with one of these crate motors, True experiences. Thanks for all the advice

I recommend you tear it down also because MP has not sold that engine since at least 2004. So if it's advertised as "brand new"...that point is somewhat debatable. If it's an "engineering dyno mule" consider the use/abuse it might have seen and take that into account too. Either way Look for rust/moisture/storage damage/dry areas that shouldn't be, just because it's old and has probably been sitting.

Not only that but the warranty is based on time only, 90 days (not use) and is long expired...so yeah, go through it.

Carb wise MP always recommended an 850 vacuum, but if it were mine I'd want to try an 850 annular dp.

There are a couple 500 wedge cars floating around here, hopefully the owners will post some real experiences.

The carb depends somewhat on how you're going to use the motor. For bracket racing duty I'd probably go with a Holley 1000HP which is basically just the old 850 DP carb with a profiled air horn. (no choke housing). Those are nice carbs and they'll work well with 500 inches.

For street use I'd go with a smaller venturi than what the 850 DP carbs had. With 9:1 compression and a 509 cam a small venturi carb would probably help the driveability a bunch. If it was my car I'd start with something like this BLP modified 650 Holley. I know that everyone will tell you that a 650 is way too small for a 500 inch motor but I bet if you tried a carb like this it would work a ton better than a 850 DP.

You have a heavy car with low compression and a camshaft with a bunch of overlap. Unless you have some 4.86 rear gears you'll probably be better off smaller rather than larger in the carb department.

Crate motors used the 509 hyd cam which is an okay cam if you know how to tune around it. It has a bunch of overlap though which makes it a pain when combined with low compression and a 1.560 carb. That was the standard "street racer" combo back in the 70's and a lot of those cars ran like poo.

If the guy knew how to clean up the idle circuit it would work okay but not a lot of people knew how to do that 30 years ago. (no billet metering blocks back then) The other crutch would be 4.88 rear gear and/or a bunch of initial advance.

Cam specs are 248 duration @ 0.50 509 lift
I am going to bracket race the car with this motor, no or very little street. Oh and the gears are 3.91

This is what I was looking at:


Proform race series 850 DP


Description:



Finally an affordable high-performance race carburetor! PROFORM's new Race Series Carburetor is hand assembled in the U.S. utilizing the PROFORM High-Flow Carburetor Main Body, durable billet metering blocks, and a high performance billet throttle base plate.

The PROFORM Race Series Carb includes:

PROFORM Carburetor Main Body High-Flow Main Body!

Dyno-Proven Horsepower & Torque Gain!

Adjustable, Screw-In Air Bleeds!

High-Performance Down-Leg Boosters! (except 650 CFM)

Maximum Air Flow.

No Air Horn, Choke Tower, or Choke Control!

High-Rate Air-Flow Section Design!

PROFORM Billet Throttle Base Plates

Adjustable Secondary Air Flow Cam Bracket!

Solid Billet Construction!

Hand-assembled in the U.S.!

Timed & Full Vacuum Tubes for Accessories & Tuning!

Welded Throttle Shaft!

Button Torx Head Throttle Plate Screws!

Power Valve Blow Out Protection!

Slip Link Mechanical Secondary Linkage!

PROFORM Billet Metering Blocks Solid Billet Construction!

Durable, No Warping or Porosity Problems!

Changeable Idle Feed Restriction

Don't know the lope sep.

Get a hold of Jesse from Bigs on the board here...He can fix ya up!! Just ask Davey Boyd...

The ProForm 850 DP is probably a 1.560 carb which I think is too big for your combination. Once again, heavy car, low compression, lots of overlap and moderate rear gears. I'd go smaller, probably nothing bigger than a 1.375.

Hello....the best choice for this application is the Holley 950HP in my opinion....

The 950 has the smaller 1.375 venturi that your gonna need to get this heavy car up and moving off the starting line....The Proform 850 & Proform 950 carbs both are larger on the venturi diameter at 1.400 & 1.450....and that is starting to hurt your bottom end responce as you go bigger then the 1.375....

whether you buy a Holley HP or have a custom carb built, you will be happy....

I attatched a link to our BIGS Stage 5 950 below....we have great pricing left over from the Holidays also.....Thanx allot, Jesse @ BIGS!!

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200421128946&ssPageName=STRK:MESELX:IT