Posted By: hudsonhornet7x
What would you expect this engine to make? - 02/17/14 01:33 AM
Trying to help out a friend..
What should this combination produce? Also what about E.T. in a 68 b-body approx. 3400lbs?
383 turned 431
Edelbrock rpm heads fully ported.
10.5 :1 compression
Victor intake
950hp carb
Cam to be determined- any suggestions?
I know this is a difficult question to answer with the info given, but what are some educated guesses figuring that the chassis will be optimized for the strip?
Thanks!
Posted By: hudsonhornet7x
Re: What would you expect this engine to make? - 02/17/14 03:31 AM
Thanks for the guess! I will now commit blasphemy and ask how a thumpr cam would be!
Posted By: 493_DART
Re: What would you expect this engine to make? - 02/17/14 04:47 AM
I highly recommend calling Hughes for a cam. they are Mopar only and will get you a perfect cam for your combo.
I went from a Scott Brown cam to a similar spec Hughes , and the car picked up over a 10th . Love the Hughes stuff
Posted By: Von
Re: What would you expect this engine to make? - 02/17/14 04:53 AM
High 10s (80s-90s) when sorted.
Call Porter for a cam...
Posted By: gregsdart
Re: What would you expect this engine to make? - 02/17/14 05:10 AM
Head flow says you could make 600+ hp if they flow 300 and you put a great cam in it and spin it enough. Mid to low tens, if you have enough cam and the rest of the combo is right.EDIT: I was a bit optimistic, thinking you might go roller cam.
Posted By: hudsonhornet7x
Re: What would you expect this engine to make? - 02/17/14 05:53 AM
Thanks everyone for the advice. I am actually surprised that the car would have that much potential with everything sorted. I was expecting 11.50's to be honest.
I will help my buddy research cams and will call the aforementioned people.
Thumpr cams were mentioned not because of the sound, but the fact that more and more people are finding wide powerbands with them.
Any other suggestions? Also, with steel caps when should we be worried with the power output? Or won't this engine make enough to worry?
Posted By: CompWedgeEngines
Re: What would you expect this engine to make? - 02/17/14 06:34 PM
Although there are too many " unknowns" with this combo, it should run well below 11.50. The key will be cam selction, and more importantly chassis efficiency and tuning knowledge. I am doubting its going to make 600 HP in that package on pump gas, but if the chassis, converter and gears are in alignment, it will run better than your expected ET goal. ITs all about the package, not just the engine.Who ported the heads?
Posted By: gregsdart
Re: What would you expect this engine to make? - 02/17/14 06:54 PM
My estimate of 600 hp came from a friends combo that is a touch different, but low compression. The Fast and Furious, Joe Schmall that races locally in the tri state area runs a 446 cube RB, box stock small port Eddys, flat tops about .040 in the hole, 590 cam ,850 Holley, single plane, and a well sorted chassis combo has run 10.90s in great air at 3900 lbs! Shift point is 6200 rpm. The low deck would have some advantages to offset the 17 cube difference I would think. Basically I believe it is just how much cam you are willing to put in the motor, and spinning it up to maybe 6500. Chamfering the bores for intake valve unshrouding would more than likely help, as that was done on 426 SS motors If I recall correctly. Again, good head porting, and a roller ought to really make some steam.
Posted By: qwkmopardan
Re: What would you expect this engine to make? - 02/17/14 09:12 PM
I agree it should make 600+HP. I built a 440 for a friend with a 1968 Satelite. Ported edelbrock RPMs, STX-21 [272*-.560"] Racer Brown flat tappet camshaft, Stock cast crank, victor intake, 1000 cfm gas carb, 10.5 to 1 CR, flat tops .02 in the hole, 727 trans, 9 1/2" converter, Dana 60 with 4.10 gears and, bought used, 28" x 10.5" M/T slicks. 3300lbs with driver. Chassis was well sorted, lol, 1968 stock, way worn out, leaf springs, stock front suspension and no roll bar. 1.46 60ft.--6.54 1/8th mile--10.35 at 129.8 MPH in 85* not so good air.
Car now has an 8 point CM cage and MP S/S springs. Maybe some 10 teens in some decent spring air.
Posted By: hudsonhornet7x
Re: What would you expect this engine to make? - 02/18/14 02:31 AM
Lots of good input here. Here is what I know about the car:
1968 B- Body
4- Speed- 18 spline, ram clutch
8 pnt. bar, subframe connectors, torque boxes, Core support brace, inner fender to cowl braces
Cal Tracks and mono leafs
Tires TBD.
The aforementioned 431.
Anything else he should be looking at getting or changing?
Posted By: gregsdart
Re: What would you expect this engine to make? - 02/18/14 03:11 AM
My ET guesstimates were based on your location out east, and thinking the car would be a tubbed, automatic race car. The stick won't be near that fast with tire and suspension limitations. The rear shocks should be at least single adjustables. A post about how to set this car up will help a lot.
Posted By: qwkmopardan
Re: What would you expect this engine to make? - 02/18/14 03:26 AM
Depends a lot now on how good the driver is rowing through the gears. Hopefully it is an early trans with the 2.65 1st gear ratio. Sounds like it would be a real fun car to drive on the street.
