how to get 300rwhp???

5.0kid · Mar 29, 2008

Ok, so i am building a 306 right now and i have a question on what all i need more to get to the 300 rwhp mark.
here is the setup i'm planning on:
87 block
30 over hyper pistons (may end up using stock forged pistons cause found new block that doesn't need bored)
edelbrock rpm intake
holley 600cfm carb
gt40p heads, stock
erson cam w/ 280/290 214/224 @ .050 .472/.496 lift and 112' lobe

what do you guys think of this set up? I won't be able to have any better heads than that until maybe the end of the summer cause of money, but that would be a start. Also, they had a more aggressive cam that had .520 lift. thats too high w/o piston notching correct?

it will have a 2.5 inch exhaust w/ shorty headers also. and 3.73 gears for rear.

trav_19 · Mar 30, 2008

you wont be there with that ...

and if you reuse the forged pistons you will be using a different block so it would be a 302

are you staying efi or going carb?

if you cant get heads and all you plan on really adding is the cam i say you will need nitrous its cheap and VERY effective....plus your cam is kinda designed for it....with the duration being open longer on one side

Stangbangin · Mar 30, 2008

you hit 300 hp with those heads. My old combo that I brag about around her had slighty ported gt40p's , a comp cams xe240r cam and a trick flow (fuel injected I know is different than yours). But made 295hp and 321 tq. You're gonna need more cam and need to clean up the port on these heads. But if you have more plnas down the road I would say save up for new heads. But if 300 is your goal you can get there with that plus all the bolts ( fuel exhaust, pullies etc)

5.0kid · Mar 30, 2008

ok, i am still somewhat plannign out the engine. i think i may just stay with the forged 302 pistons since they look to be in good condition. the motor i am going to get now is a 94 bronco 5.0 that was running a couple years ago when pulled. the guy i was going to get the heads from sold them so i think i may just port one of the sets of e7's i'll have and wait till the end of the summer to buy better heads. And yes, it is going to be a carbed setup. How high of lift are those good to? with upgraded valve springs...
also the comp cams guys told me to get a 280 magnum cam. is that too much lift for the stock heads?

carbed94 · Mar 30, 2008

yea i would use the motor with forged pistons there much better if your gonna spray it...but yea with spray and carb u should be over 300 easy

5.0kid · Mar 30, 2008

sorry forgot to add i won't be spraying it. i should be over that mark when i get some aluminum heads right? i was thinking the ebay ones that are like 750 dollars. i would go with afr heads but my dad wouldn't allow me to "waste" that much money on them.

trav_19 · Mar 30, 2008

with afr your paying for the name....im heading the same route as you with my 408 im getting a affordable aluminum head and haveing it machined the way I want it....better off in the long run.....and i would run a forged piston regardless ...sorry i really must have over looked your post you mentioned like every question i had asked already haha....if your familiar with a carb and can tune it properly you can be at or above 300 pretty easily with your mods and i belive the 94 bronco motors were roller cam motors so you will be good in the cam department....with a 302 deck heights yada yada its best to stay under 500 lift over and your can have valve to piston issues ... what comp. ratio are you going for?

carbed94 · Mar 30, 2008

alum is the way to go if ya go the money less weight more power =goin faster :dancing6:

Mr. OAM · Mar 30, 2008

If you are getting the 280HR cam for the carbed application it has .560" lift on both intake and exhaust. You may not have any problem, unless using 1986 factory pistons, but it would still be good to check valve to piston clearance before assembling the engine.

To get 300 RWHP you will need about 350 HP at the flywheel. Though the 280H cam would be great on the street ....

HYDRAULIC ROLLER-Street machine
and limited high performance street
use. Best with 5 speed or 2200-2500 stall.
3.40 to 4.10, aftermarket intake and headers.

...it will not get you there without serious help. You are going to need some very well ported heads. If the ebay heads you are looking at are Chinese stay away from them. By the time you pay for a shop to turn the crap into gold you can buy some quality heads that won't make you sorry.

I would go with a little more cam if you are shooting for 300 RWHP, and some quality heads. Also go for what you call long tube headers. That's where the performance is. Anything shorter is only for fit or marketing. The 600 CFM carb is the size you need. Good choice on intake too. :thumb:

As for calling an engine that's been bored out .030" and adding 4 cubic inches, the displacement is neglegible as 4 cubic inches is adding just over 1% more displacement. Back in the day we never called them 306's, just a 302 bored out. Basically it is to square up the cylinders to the crank after the block has been heated and cooled so many times.

Steve

5.0kid · Mar 31, 2008

thanks for all the advice! i am actually looking at another stang today since my friend is being annoying about his whole aunts car thing. it has a 351w w/ a cam w/ .498 lift, a hurricane intake, an edelbrock carb, and an exhaust. it is in my price range and is already modified. could anyone by chance help me out with a vihicle history report if they have unlimited?
1FALP4046RF153694

carbed94 · Mar 31, 2008

well a 351 will almost 100% put u in the 300+ range...LOL

5.0kid · Mar 31, 2008

checked out the 351 car and it was crap. neede a lot of work done to it. anyway, i decided on the magnum 280 cam from comp cams and i am going to go ahead and get some gt40p heads for the mean time. i heard you can get a different plug wire so you don't have to have special headers? is that right?

carbed94 · Mar 31, 2008

im not sure i always heard u have to have new headers .....let me know how that cam works out im runin a tfs1 and love it but i havent heard much about the comp cams

Jonesy347 · Apr 1, 2008

I would go with the good all around F-cam. I was running 2.02, 1.6 rocker, in old fully ported 351 W heads with stock pistons without any clearance problems. However, I would not go above .512 lift with stock reliefs. If you are reduing the motor anyway spend the few dollars more and grind new reliefs. You can run whatever cam you want easily achieving your 300rwhp.

Magic · Apr 1, 2008

Here is my example (a friends 85GT, 302 carb)

stock '88 rebuilt bottom end 302 (ARP rod bolts, Main Studs, balanced rotating assembly)
Custom grind hydraulic roller camshaft (I dont know the specs, sorry)
Stock E7 heads (ported on the exhaust side, basically thermactor bump was removed, and casting boogers cleaned up, Crane valvesprings, stock sized valves with valve job and new seals)
Edelbrock RPM AirGap intake
Stock 85 Carb (played with jets), fed with a Holley mechanical pump (12-289)
BBK 1 5/8 Long tubes, Off Road H, Flowmaster catback
3.55 gear in an 8.8
T5 transmission

Believe it or not, this thing thumped out 280ish RWHP/ 315RWTQ on a Dynojet....went 13.1s on some old BFG 235 drag radials...

5.0kid · Apr 1, 2008

wow! thats pretty impressive! i'm getting the new block tomorrow hopefully. with hearing this stuff about the e7 heads i think i may just try porting them out for now since it would cost around 225 to get some gt40p's so i can just wait on an aluminum upgrade this summer. plus i'll have two sets of those e7 heads i can mess around with the porting with.