I have an 1987 Ford mustang 5.0 and I blew the head gaskets when I went to the track to I decided to rebuild the engine since it already had 200,000 miles on it. The car already had BBK 70m throttle body, long tube heabers, off road straight pipes with one chamber flowmasters, 3.73 gears, centerforce dual friction clutch with holds 90%, tremec T-5 trans, underdrive pullies and zex nitrous 125 shot of nitrous, and BBK Cold Air intake. I decided to bore the block .030, moly rings that would hold the nitrous well, forged pistons, b303 cam, trick flow intake 1500 to 6500 rpms, BBK 190 fuel pump, 30% high flow water pump with 160 thermostate, rebuild the stock heads,  and aluminum drive shaft. So do you think that my car would run at least a 13 and if not what else to I need to make my pony run low 13s all motor, I want be able to beat the LS1.  

It should go mid 13's with the recipe you mapped out.  The only question is the cam/head/intake combo.  The B303 is too much for the stock heads and the intake you speak of is the Track Heat.  I have that intake myself and it makes power, but it's not matched to the stock heads.  On all Ford engines the heads are the weak link and if you could get some AFR 185's, TFS Twisted Wedge, or other heads with intake volumes of 180-190, you'd make some mad power and would beat the LS1.  Mine has a DSS short block, TFS Street Heat heads, TFS Track Heat intake, Comp Cams nitrous cam and all other bolt ons and it puts down 320 rwhp, naturally aspirated.  It ran 13.54 but with the 125 Zex, it'd be in the 12's.   

how will an e or b cam do with stock cast gt 40 heads?I was told I'd need to change roller rockers,too? but some say It'll be ok with stock .....?just trying to get educated here..I figure at least one ford racing cam may be ok with stock heads  

The E would be better than the B.  This is with stock heads and stock rockers.  Rollers aren't necessary but are more accurate than the stockers because they don't deflect.  You get the exact ratio you need.  With GT40 heads the power difference would be even more so I'd suggest going with the E303 over the B303.  But make sure the springs can handle the cam lift so valve float doesn't pop up.   

I agree on the heads.. I have a '91 lx convert.(400lbs to heavy) Stock bottom end 5.0 .

I used a e303, edlebrock performer upper & lower, 70mm bbk TB, cold air, shorties, h-pipe, 3.55 rear, bald rears (spun 2nd really bad) everything else stock and ran 13.9's just last nite.

stock valve train work fine with the cam but I feel I'm missing out on being just plain nasty without the heads.

Good luck

michael

what compression. if your going na put it way up in compression and make sure your always giving it premium and them some.  

How much horsepower do you think that my car will have with the recipe that I gave you. I hope to be able to run at least mid 13s all motor. Do you think 10:1 compression is to high to be able to run a 125 shot of nitrous.  

That combo should be about 290-300 engine hp.  With a good set of aftermarket heads, it'd be around 330-340.  With that, it should run about a mid 13 at about 101-102.  This is assuming that you can get the power to the ground.  Make sure you put as much effort into the rear suspension and traction.  Without it getting to the ground, all that power won't do much good.  And 10:1 isn't too much as long as you build the engine for it like head studs, O ring the block/heads, forged pistons and bottom end, and you don't get greedy with the gas. 

I have a e303 cam, Edelbrock performer RPM II upper/lower, cold air intake, shorty headers, h pipe, aluminum drive shaft, and 3.73 gears in the rear, what do you think i could run with the different gears/drive shaft.  BTW, my tb is on the way.  

I have a similar question. I have a 5.0 bored .030 over with e7te-pa heads fully ported and polished with a 75 mm mass air and cold air intake with an acufab 75mm throttlebody running 24# injectors. WIth a Trick flow street heat intake, e-303 cam, roller rockers, and a bassani x-pipe with flowmasters. I'm new to the building scene and would appreciate some info on the approximate horse power I'm running and an approximate 1/4 mile et if possible. Eventually I plan to add a set of afr 185 heads and a supercharger or maybe twin turbos with an intercooler. Please E-mail me at  IrqVet@yahoo.com

I have an 89 gt and it has a modified xb3 crate motor from FRPP. I have the trickflow track heat intake with a 70mm mac throttle body. I have a mac cold air fenderwell kit and 76mm maf. I am also running 30# injectors and 1&3/4 inch chorty headers. I also have other goody's like aftermarket rods and pistons, 3.73 gears, Super Chip custom tune, etc. I am putting out around 278 rear wheel hp. and was told that on slicks I could run really low 12's. So you should be somewhere in the neighbor hood that i'm in as far as hp but I don't know about your 1/4 mile et.

If it's a stock engine with the mods you mentioned, 13's provided you have traction.  Just know that intake can go all the way to 7 grand so you may not be able to get every last ounce out of it without more airflow from the heads, cam and compression.  

I'd say it right now is around 300 hp and should hit the 13's with traction.  Just the AFR's would give you 40-50 hp more over a set of ported stockers and if you're going the boost route, they'd be perfect.