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The longer stroke is what made it a better overall engine than a 30poo.
But for my $ in sbc's 400s are the way to go.
True and that attribute also cut its RPM capability which is where small cube small blocks need to maintain Hp. Hence the ford and chevy 302 being 4"bore x 3"stroke.
The smallish bore on the 305 limited valve size upgrade.
These threads are motivating me to purchase that back issue of PHR and relive the glory days of 305 vs 302 vs 2.2mopar. Where is my playboy air freshener to dangle off the rear view mirror in true 80s fashion.
Well.....the stroke not gonna limit rpm. The bore likely will at some point buy just not being able to get a big enough valve in it. But at what point?
The bigger problem i see with 305 performance is almost any head your gonna put on it will lower compression if you're talking h/c stuff. Then beyond that the valve size.
This hotrod article that's being done will be interesting. The 305 won round one.
Weren't there almost no performance heads made specifically for 305's? Sure 350 heads would bolt up but the compression would drop as a result. I recall people back in the day porting 305 heads and putting them on 350 engines to raise compression similarly to how we often use the 5.3L LM7 heads today. I can't remember anyone ever doing anything but modifying the stock 305 heads in their 305 builds.
TFS makes a set of heads for 305. And WOLD Products does as well. Most guys would work the 113 heads, 1988+yr. L98 aluminum heads, they are 58cc. So they worked great on the LB9. Especially Boosted builds.
Let me know if you need any information on the heads. We maximize the valve size for the bore and start with a small combustion chamber to maintain compression.
I remember the 335CI stroker kits for the 305. I debated doing that with one of my F-bodies back in the day. Instead I did the sensible thing and went with a 383.
Been awhile since I've been into 5.0 stuff, but I don't think you're getting a whole hell of a lot more out of a similar SBE 302 upgrade.
That's an engine dyno, so that's about 305 to the tire if we say 15% drivetrain loss.
My car was rated 200hp stock (86 GT), and my latest dyno made 372 to the tire (with issues but that's not the point) which comes out to be 437-438 at the crank. You could drive my car across the country and back with no issues, it's very mild. 238hp gain from stock to where I am now. 305s just aren't in the same league.
That's an engine dyno, so that's about 305 to the tire if we say 15% drivetrain loss.
My car was rated 200hp stock (86 GT), and my latest dyno made 372 to the tire (with issues but that's not the point) which comes out to be 437-438 at the crank. You could drive my car across the country and back with no issues, it's very mild. 238hp gain from stock to where I am now. 305s just aren't in the same league.
My car is stock bottom end, upgraded HCI.
Could be on a stingy dyno like westech. No really comparing the numbers being spoke here.
What torque did you make? Never seen a graph either. But either way you're not out of 305 striking distance like you think you are. People just don't eff with them when there are better alternatives that fit easily. .....unlike the furd stuff.
You stroke your dick to a 8.2 deck build because that's what fits and you can get parts for. A sbc is a sbc....they all fit in the same hole with same accessories surrounding them. Another reason why the sbc kills the sbf.
A 307 build would be interesting. Never seen one of those done. Again ......likely because a 350/383/400 fit in the same hole so .....why? Maybe if you're trying to do some class specific thing is the only reason i can think of.
I had a 302 and it was cheapest to mod the 302, I didn't mod my car because I have a chip on my shoulder about 305s. I know what they're capable of.
If I had a shot of vodka for every time I heard someone cry "stingy dyno", I'd have died from alcohol poisoning.
The point of the discussion is the 302 is superior to the 305 because people actually choose to mod them and hang onto them vs throwing their 305 on the end of a chain to keep their boat in place.
Here is my graph. It was sputtering at the top of the graph so we didn't ride it out to 6800 like I wanted to.
You're just speaking in hypotheticals about the 305. Nobody uses them because they suck. My 302 makes more power than a lot of 8.2 strokers so why would I go there? If I want more motor I'll do a Windsor with Cleveland style heads.
I had a 302 and it was cheapest to mod the 302, I didn't mod my car because I have a chip on my shoulder about 305s. I know what they're capable of.
If I had a shot of vodka for every time I heard someone cry "stingy dyno", I'd have died from alcohol poisoning.
The point of the discussion is the 302 is superior to the 305 because people actually choose to mod them and hang onto them vs throwing their 305 on the end of a chain to keep their boat in place.
Here is my graph. It was sputtering at the top of the graph so we didn't ride it out to 6800 like I wanted to.
You're just speaking in hypotheticals about the 305. Nobody uses them because they suck. My 302 makes more power than a lot of 8.2 strokers so why would I go there? If I want more motor I'll do a Windsor with Cleveland style heads.
Good numbers, Snake. Nice torque also.
I was going to ask you if you tried to spin it higher. With a cam, I am sure there is some extra power hiding in that upper rpm range.
Were you able to find the cause of it sputtering? Curious what more you could squeeze out of it.
Honestly I checked my distributor rotor phasing and it was off quite a bit. Fixed that, new Motorcraft coil, and problem went away.
I dyno'd on a 28" tire as well, they told me it would have read higher with a 26" but I was more interested in the shape of the graph than some peak number.
I had a 302 and it was cheapest to mod the 302, I didn't mod my car because I have a chip on my shoulder about 305s. I know what they're capable of.
If I had a shot of vodka for every time I heard someone cry "stingy dyno", I'd have died from alcohol poisoning.
The point of the discussion is the 302 is superior to the 305 because people actually choose to mod them and hang onto them vs throwing their 305 on the end of a chain to keep their boat in place.
Here is my graph. It was sputtering at the top of the graph so we didn't ride it out to 6800 like I wanted to.
You're just speaking in hypotheticals about the 305. Nobody uses them because they suck. My 302 makes more power than a lot of 8.2 strokers so why would I go there? If I want more motor I'll do a Windsor with Cleveland style heads.
Lets see.....you make a thread about 30p00s and 305s knowing no one eff's with 305s but you have no chip on your shoulder.....oookkkkk
I can't see your graph to know what the tq is for some reason. The curve does look nice. But i see absolutely no reason a h/c 305 couldn't match or beat it when taking into account you're running to nearly 7k. You're speaking the hypothetical by assuming a 305 can't keep up.
Just because you think people choose a 30poo over a 305 to build makes it better couldn't be more wrong. I explained this in how each engine runs in trucks. People build a 30poo because that's what's available to them easily accessible. The same reason people build 350s or 400z except they ain't stuck with a fucki. 30poo or short deck block.
Back to which one is better. How many 30poos have you seen in a boat? Plenty of 305 boats out there. 305 must be better right.
08-08-2017, 06:46 AM
