[98roush]

I can get a good set of World products Sr heads for pretty cheap and i was wondering what i could expect. or if i should go somewhere else. I have a 351W bored 60 over edelbrock performer intake, 750 holley DP, LT headers, mildish cam. Now one thing thats worrying me is the Sr's 64cc combustion chamber with my stock pistons(17cc dish i believe) i think this would give me somewhere around a 9.0:1 compression ratio? A little low to make any power right? if not what kinda power could i expect? id like the 400 range

right now the heads are some sort of stockers not sure which casting with some gasket matching port work.

[91cobra5.0]

i might be wrong but im pretty sure u can make a lot of power on any compression ratio, it just depends on what you doing with the car.

[GoodOleBoyzRacin]

your gonna need a bigger intake and cam to get around 400. go ahead and get those heads. ive heard good things and if you can get em for a good price they should work well with your setup. id definetely see bout gettin a bigger cam and maybe a air gap or victor jr intake or somethin.

[89LX347]

just get the heads for cheap, take them to a machine shop and have them milled down to where you get a nice 10.5:1 pump gas compression.

[superbean]

You can run a 9:1 engine just fine and make power. Just remember, for whatever compression you loose, you can add a few degrees of timing even with pump gas to milk a little more out of your engine.

Look into an air gap or performer rpm intake.

[fateisajester]

I have those heads on my 351 fairmont. Im running 10.5:1. I never got it dyno'd but it runs 11.7@116 pretty consistantly. Im guessing around 400hp

[M L Struck]

That's a pretty good guess 400hp 3000lbs car high 11's

[superbean]

Originally Posted by fateisajester I have those heads on my 351 fairmont. Im running 10.5:1. I never got it dyno'd but it runs 11.7@116 pretty consistantly. Im guessing around 400hp

fast enough lol

[Iwannagofast]

Originally Posted by M L Struck That's a pretty good guess 400hp 3000lbs car high 11's

would that car be that light?

[89LX347]

Originally Posted by Iwannagofast would that car be that light?

yes, thats pretty darn light

[89LX347]

Originally Posted by superbean You can run a 9:1 engine just fine and make power. Just remember, for whatever compression you loose, you can add a few degrees of timing even with pump gas to milk a little more out of your engine. Look into an air gap or performer rpm intake.

adding 2,3,4 degrees of timing is NOT gonna even come close to making the same amount of power as he would with higher compression. you can just keep advancing the timing out of the same cam.

[GoodOleBoyzRacin]

Originally Posted by 89LX347 just get the heads for cheap, take them to a machine shop and have them milled down to where you get a nice 10.5:1 pump gas compression.

you would need to mill them down alot. ive been there, asked that.

[GoodOleBoyzRacin]

Originally Posted by superbean Look into an air gap or performer rpm intake.

+1 on the intake.

[98roush]

Wow thanks for all the quick responses everyone. Sounds like im gonna get them. I was thinkin a 3 angle valve job to freshen them up and get them planed down and bump the compression to around 10:1 NOW what about my piston to valve clearances? Stock pistons and 2.02 valves, think i can get away with notching the pistons a little? lol Also anyone got any price ranges for the machine work?

[98roush]

might i add this is a street car, to and from work and college all week in florida 100* summers, out on the town at night and at the track once a month or so. Oh and its a 98 Mustang GTish lol

[98roush]

My cam specs

...........................INTAKE..........EXHAUST
.050 DUR-------------214-----------224
SAE DUR-------------290------------300
CAM LIFT------------.295-----------.310
VALVE LIFT----------.472-----------.496

[89LX347]

Originally Posted by 98roush My cam specs INTAKE EXHAUST .050 DUR. 214 224 SAE DUR. 290 300 CAM LIFT .295 .310 VALVE LIFT .472 .496

your gonna have to call you local machine shop, make sure you find a good one, and ask them about prices. also they can tell you if the valves will clear. with those specs it should but you never know. and also depends on your timing, how much advance/retard your gonna run.

[98roush]

89LX
i know of a good shop just havent had the chance to call them, too late after work and was just wondering what others have paid, get a ball park, the heads are $750 with roller rockers, wondering if theyre gonna be worth it after a valve job etc

[superbean]

Originally Posted by 89LX347 adding 2,3,4 degrees of timing is NOT gonna even come close to making the same amount of power as he would with higher compression. you can just keep advancing the timing out of the same cam.

very true. It wont make near the power, but he can milk a couple of ponies more out of it and still be safe on pump gas.

[Arctic Fox]

Originally Posted by 98roush My cam specs ...........................INTAKE..........EXHAUST .050 DUR-------------214-----------224 SAE DUR-------------290------------300 CAM LIFT------------.295-----------.310 VALVE LIFT----------.472-----------.496

I'm no expert, but isn't that kind of mild cam for a 351? Hell, even the E cam got more duration and lift on the intake side.