OK i just prchased an 85 LX 5.0 and was wondering what a HP est would be. I have will get the car to the dyno some time but just wanting to know. Here are the Specs

Bored .030 over
Forged Pistons 10:1 compression
'91 5.0 heads, heavily ported
oversized intake valves with 3 angle valve job
Dual valve springs
Roller Rocker Arms 1.6:1 ratio
ChromeMoly push rods custom length to match the heads
Double roller timing chain and gears
High rev Anti pump-up lifters
ChromeMoly Oil Pump Drive shaft
High volume oil pump
Balanced and blue printed
Performer RPM intake
Performer Carburetor 600 cfm
Accel Super Stock distributor
The block was acid dipped and checked every which way before it was built
Exhaust is shorty headers with 2.5 inch collector into 2.5 inch pipes with "X" pipe into more pipe then 2.5" 2 chamber flowmasters. Stops before rear axle.

OK here is everything that is on the cam card. Old owner gave it to me.
Intake @ cam 307 @ valve 491
Exhaust @ cam 318 @ valve 509

Cam Timing opens closes Advertised duration
@ .0042 Intake 31.0 BTDC 69.0 ABDC 280
Exhasut 80.0 BBDC 30.0 ATDC 290

opens closes Max lift duration
@.050 Intake 3.0 BTDC 37.0 ABDC 107 220
Exhaust 52.0 BBDC (2.0) BTDC 117 230

Fireing order 1-3-7-2-6-5-4-8

 

325 at the wheels if your lucky

 

adder your way off....Id say 250 if your lucky!!!!

 

I am thinking you are about right. Now i want about 300 to the tires so does anyone have any suggestions. i know i can do nitrous but not sure if i want to do that. would rather go all motor. All i would like is high 12's in the 1/4. i have a C4 with 2000 stall and i know that will not help also have the stock 3.27 gears so i figure 3.55 will go in soon.

 

I made 291 RWHP/ 357 RWTQ with stock block bored 0.030 over, 11.7.1 compression, Heavily ported E7 Heads with 1.94/1.60 valves and 3 angle valve job, Z303 camshaft (228/228 At 0.050, 586/586 lift) 1.7 Roller Rockers, GT40 Intake, 70mm Throttle body, 76mm MAF, Full MSD Ignition, 1 5/8" Longtube headers running on 110 Race gas.

Then I bolted on a set of Jon Kaase 247cc Aluminum Heads which lowered the compression to 11.2.1 because the new combustion chambers were 60cc's instead of 57. With no other changes I gained 34 RWHP but lost 27 RWTQ.

Unless them heads are HEAVILY HEAVILY PORTED with 1.94/1.60 valves you aren't going to see much over stock. Your going to need to get better heads (something like Trickflow TW or AFR 165's) also use 1.7 ratio rockers and that will bump the lift up to 521/540 instead of 491/509.

I would say you'll make 260-270 RWHP. 12's are possible with slicks but not on street tires.

 

250 +/- rwhp.

my stock '89 with 13* timing and 76mm MAF made 218rwhp

 

my bad.. i meant the crank

 

I have a set of BFG drag radials that i am going to try out.

 

with everything in my sig i made 276rwhp and 321rwtq

 

with those heads..id say around 250-280 at wheelsand maybe 315 at fly hard to say..