toofst4u666

ok heres what i got, i have a 73 mustang 5.0 sitting on my stand in my shop now heres what im gonna do, i ran the casting on the heads and they got 58.3 cc chambers and im looking for high compression because thats an easy way to make power so im gonna run keith black forged dome top pistons wich will put me somwhere around 10.1 or 10.5. my friend owns a machine shop so i can go pretty nuts on the machine work so im gonna have them port and polished have a 6 way valve job done bronze valve stainless steel valves and whatever springs match the cam im gonna run with a good set of 1.6 rollor rockers and some decent stock lentgth pushrods. im gonna run a high lift cam with a pretty long duration because im looking for that rough idle. jus wondering what size head gasket i should use. but anyways. the motor will be bored .30 over and as i said it will have forged dome tops, i will be keeping the stock rods and crank as long as they all check out at the machine shop, ill have a little work done to the crank as well while its there tell me what everyone thinks ill have for power at the wheels. by the way this will all be run through a completly built c4 to a posi 8.8 rearend with 3.73's

saleenpride1986

well what kind of heads and intake and 331 or 347 or 302? If you have all stock externals and heads it's not gonna be pumping as much as you'd like. But put some nice heads and intake and a decent cam and you could pump some good numbers..

toofst4u666

the original heads will be used but they will be completely reworked im using these heads beacuse i want the small chambers, ill be running a high rise eldelbrock rpm dual plane intake with a 750 demon carburator. and also there is no emmisions equipment on the car and it has 1 5/8th headers and 2 1/2 in exhaust with no cats and 1 chamber flowmasters a/c is eliminated and im thinking about an electric water pump but it will still be a 302 considering i will be using the original but reworked crank and rods

saleenpride1986

well i'd think you'd be better off getting some aftermarket heads instead of dumping a bunch of cash into the stock heads and making em a little bit better, when you can spend a little bit more and get some that are way better. Just an opinion, especially since you're gonna be taking the engine apart and rebuilding with expensive goodies already.

ih8chevy

first off I dont want to criticize too much, but if your looking for any power gain ur not gonna get it. Not with those heads at least and the cam with a long duration for "a rough idle." In fact you may gain a slight bit of horse but you wont go faster. That carb is waaaaayyy to big for a pretty stock 302. You should be looking at a 600 or 625 cfm carb. This build looks pretty bad. If I were you I would consider something different. jmo, good luck.

toofst4u666

what if i went with a set of 60cc aluminum heads with 210cc runners with Intake Valve: 2.05" and Exhaust Valve: 1.60" only thing is i dont know about clearence issues with the dome tops, and ive run 750 double pumpers on 302's ive built before and never had any issues you just have to tune them the right way, oh and what is this i hear about swapping in a 351 crank an using the 302 rods is that worthwhile? and not that this matters but im going to be running a complete msd ignition setup distributer, 6al, coil, wires etc... any ideas on how i can make more power let me know

mjr46

if your thinking of using the KB 116 .200 dome pistons, with a 58 cc cast iron head, on a 302 it'll be almost 11 to 1 and you'll be pushing pump gas limits, I ran such but with a 58 cc aluminum head with no issues

toofst4u666

would running a re-done 351 crank with some 302 rods and flat tops be better with a good set of heads and a choppy mid-range cam?

FLcracker9

You can't run the 351 windsor crank in the 302. Forget the "choppy idle", and do some research on what parts will complement each other. Flat tops and some aftermarket aluminum heads (or gt40s if your on a budget), and a mid range cam will perform much better than your original plan. A 650 carb is plenty for 99.9% of all 302s. Over camming and over carbing an engine are a couple of the most common mistakes made by the novice builder. Nothing worse that sitting at a light with everyone staring at you because your cam has a lumpy idle, and then get blown away by the soccer mom suv in the lane next to you. Comp Cams has a tech line, and they're pretty helpful. They'll ask you a series of questions, and suggest a cam and springs that will work for you (or if you have $500, go custom cam and springs). I speak from experience (I'm an old fart now @ 49), as do most of the folks on here.