Autocross/Road Race Motor
 

Hi,
I am looking for a little friendly engine advice. I have a 65 Mustang Fastback that I would like to build a motor for. I am looking to do some autocross and road racing with it from time to time. I found a guy with a motor for sale and I wanted to get some advice on whether its right for my application.

Below are the specs, tell me what you think! Thanks in advance.

Dart 9.5-inch deck Aluminum Block
Pro-Machined 4.125-inch bore
Lunati Pro Series Forged Crank 4.00-inch
Lunati 4340 Billet Rods 6.125 with ARP 2000 Bolt Upgrade
JE Custom Pistons 13:1 compression
Comp Solid Roller - 272 @ .050 int, 279 @ .050 ext duration; .696 intake lift, .672 exhaust lift, 112-degree lobe seperation
Designed for 7,500 rpm shift point
Total Seal Rings - “CML Premium” .043/.043/3mm
Clevite Bearings, Fel Pro MLS Gaskets, ARP Bolts, Mellings Oil Pump
Comp Race Double Roller Adj. Timing Set
Comp Double Bearing Cam Retainer
Ford Timing Cover
TCI Balancer Rattler and TCI Billet Timing Pointer
ARP Oil Pump Bolts & Oil Pump Shaft
Trick Flow CNC-Ported High Port Heads by Total Engine Airflow, titanium retainers, setup for solid roller.
335 cfm intake, 255 cfm exhaust
2.08 and 1.600 inch valves
Comp Endure-X Solid Roller Lifters
Comp Ultra Gold Rocker Arms
Comp Pushrods
Trick Flow Sheetmetal Valve Covers
Wilson Ported Edelbrock Super Victor, Full Competition Porting

That is a lot of motor, especially for a Moosetang. Seems its a big more drag race, may be able to cam it down a bit. What type of gas does it use?

13:1.....at least C-14

Would I be able to reduce the compression ratio down to 11:1 and be good? What is C-14?

So you think its to much motor?

That's a rowdy combo and likely a poor autocross engine. You need the most average power for both venues. Race gas isn't worth the cost unless you need every last bit of performance.

yes its to much engine for your application. c-14 is VP race fuels 114 octane. If you took some of that cam out you could use a 108 octane fuel.

If you change the compression and cam then sure its OK.....but then the heads have to much intake port for lower rpm power.

I don't think you could get the compression down for pump fuel with thicker gaskets. you'd likely need new pistons.

that does look like a drag motor. reminds of the majority of motors for sale on racing junk and yellowbullet. a ported super victor intake is popular for drag racing as well.

all that said, that thing sounds bad ass! should easily be over 700 hp.

I started reading the specs and thought ..... sounds like the motor in my Mustang..

My motor is 12.5:1 and the cam is smaller.. If I remember right it has .650 lift and more like 263/258 duration @ 50 etc -- and requires 110 octane... It DOES NOT like to be lugged....like anything below about 3000 rpm it's not real happy... but is wonderful on the road course.

The problem with going to a smaller cam is that you may actually end up raising the cylinder pressure. I seriously doubt you could ever get it down to pump gas level with 13:1 CR pistons.

Hey everyone. Thank you for the advice, I see that this is not the right motor for me!

Can anyone give me advice on what kinda motor I should be looking for. Any suggestions on good crate motors out there that would be good for Autocross and Road Racing.

Thanks again.

Ha. I was right. This motor did just show up today in the classifieds of a site I mentioned... sounds about right, and it is/was indeed a drag motor.

For a nice autoX/road race motor, here's what I would want and I am looking for in my next generation of powerplant and I have the same/similar goals.

650-700hp to peak at no higher than 7k rpm, and still maintain solid mid range torque and decent enough low end for drivability and autoX. You can get there with enough cubes and a big solid roller if you want a small block such as the one you posted.