I was just wondering if the heads off of my 1980 GMC Jimmy, which had a 350, would bolt on to my 305 without any major problems?

 

Why? Worse flow, much lower compression, and alot of power lost is the only thing that will result.

 

Actually, I was looking into getting a stroker kit. What kind of heads should I get?

 

Depends on what you are trying to do. I would go with 14022601 305 HO heads.

 

Don't ever stroke or rebuild a 305, bad, bad idea!

 

a lot of times from what I understand a 350 head won't match up well with the bore of a 305. you lose a lot of the quench area which helps produce more power, give you better gas mileage, reduce the chance of ping and all in all just make things a lot better by having this quench

better off I would say finding a decent set of 305 heads

 

btw........there is a replacement for displacement, turbochargers. the most powerful horsepower per cubic inch motors ever built were 98ci engines used in formula one in the 1980's. they made up to 1500hp from only 1.3 liters! think what the possibilitys could be if this technology was applied to larger motors...400ci motors that make 6000hp, if we were to ignore deminishing returns.......

 

another btw
98ci is a little more then 1.3L

my little rx7 is 79-80 cubic inches depending on how you round and it is 1.3L

 

I had the shortblock on my 305 rebuilt recently with speed pro flattops (4 valve reliefs), rest completely redone. That cost me $370.00 It is now a 312 that I am going to use to push a little Skyhawk into the low 13 or high 12s NA. It pushed my full size van with a 3.08 rear and stock stall in a 700r4 to a 14.8 @ 95. That was with just a comp XE274H, stock manifolds, stock intake, stock Q-jet, all emissions stuff, etc.

 

ok rx7 speed, im sorry to pick on you but you are continueing a myth about the rotory displacement. if you were to look at the cycles of combustion and volume of air going into your motor, you would find that it is at minimum a 2.6l. it would take forever to explain this to you, so heres a link to a discusion between engineers that explains it thourghly....
http://www.eng-tips.com/viewthread.cfm?qid=96283

now be informed/enlightened/disapointed

 

it's not much of a myth rating at 1.3L

displacement is the total volume minus compressed volume

there is no stipulation being that because a rotary takes it's full displacement in with one rotation of the crank vs two of the piston motor

now just being that a rotary displaces it's full volume once every rotation doesn't mean it displaces twice the air
all it means is that it displaces twice the air VS a piston motor


try taking a look at webster.com for an explanation of displacement
a few of them per webster

if you do the math on how much air the piston motor displaces it is rated at how much total air it would draw in
again expanded volume minus compressed volume
you can't take a rotary and measure it's expanded volume and minus it's compressed volume and say well now because a piston motor has to do two revs we should multiply the rotary by 2


not at least to get TRUE displacement

if you want to say equivilent displacement in reference to a piston motor that's fine
but your method still is not TRUE displacement


so no myth here

 

i just got done building my 334 stroker and trust me its well worth it mines very extream but it is a great motor 50 hours of running and only a valve adjustment
with out the 10 71 yes 10 71 supercharger and duel 1050 dominators it made 573 hp at 5700 rpm and 612 lb torque at 3600 rpms now my hp is over a 1000 and same with torque but when u think about it it was worth the money i built my short block for 3500 and a long block for 5 grand and my motor will spin to 9000 rpm with no problems now i just need a tranny to keep up lol

 

I want something like vegita365. What kind of cam should I consider?

 

I am usually one to give people the benefit of the doubt, but I can't help but raise the flag on this one.

 

u can call it what ever u want i call it alot of money and a bad *** motor if u want to as soon as i get a tranny for my car u can come and see it at houston race way park ur call slick

 

sorry to hijack but will 350 heads work well with a 383

 

Sorry RX7 see in the definition where it says piston. Sorry you can't apply that definition to a rotary engine. Your rotary engines "displacement" used to produce power is twice what they list in there specs. Because on a 4 stoke engine the intake charge is taken in only 1 for every 2 revolutions of the crank. On a rotary engine the intake charge is taken in every revolution, or double that of a 4 stroke piston engine.

A more accurate definition of displacement is the volume of intake charge pwer revolution of the output shaft.

The key for comparing the displacement between the 4-cycle engine and the rotary engine is in studying the degrees of rotation for a thermodynamic cycle to occur. For a 4-cycle engine to complete every thermodynamic cycle, the engine must rotate 720° or two complete revolutions of the crankshaft. The rotary engine is different. The engine rotor rotates at 1/3 the speed of the crankshaft. On two rotor engines, front and rear rotors are 180° offset from each other. Each rotation of the engine (360°) will bring two faces through the combustion cycle (the torque input to the eccentric shaft). This said, it takes 1080° or three complete revolutions of the crankshaft to complete the entire thermodynamic cycle. Obviously, we have a disparity. How can we get a relatable number to compare to a 4-stroke engine? The best way is to study 720° of rotation of the two-rotor engine. Every 360° of rotation, two faces of the engine complete a combustion cycle. 720° will have a total of four faces completing their cycle. 40ci(654cc) per face times four faces equals 160ci or 2.6L. That’s a well-reasoned number and now gives us something to be able to compare to other engines. In addition, since four faces passed by in the comparison, it’s like a four cylinder engine.

Now we know, the 13B compare well to a 2.6L 4-cylinder 4-cycle engine.

Sorry dude. Rotary are still cool but lots of R&D needs to be done to produce a really good one. Piston engine have been under very extensive R&D for about 100 years. Rotaries have only seen very limited R&D for about 50 years.

 

Afraid I have to go along with Blue92 on this one. I've seen too many blown big blocks NOT making 1000hp. And a 10-71 just aint that much blower. I mean, I guess it's possible, but the guy who builds this much HP will surely have his tranny planned out, as well as realize he has a whole bunch of other major problems to solve. And why would someone seeking these kind of numbers stroke a 305 anyway? A stroked 350 would be superior start on such a project for the same money. And if this motor is making peak HP at 5700, why are you spinning it to 9000? Just doesn't seem to make sense. 1000 HP on a $1500 set of heads? And two dominators? Sorry, but it sounds like a wet dream to me.

 

Ill admit I'm a little tired on this one since it is a little early in the mornin ( hey I don't get to bed till like 5-6 in the morning)
but it seems as though you keep trying to comprare a rotary with a 4 stroke
what about a 150cc motor
since as you say it would complete it's thermodynamic cycle at 360* just like the e-shaft why is displacement for it then still rated at 150cc why not 300cc?
would this be incorrect?
or would it just be a way to make it compare with a 4 stroke?

 

a i didnt know what car i would be putting this motor into and b. i said it will spin to 9 grand i am putting out 30psi of boost like i said if u want to be ignorant and call me a lier thats ur choice i had it built i watched as it was put on the dyno and seriously u can kiss it

 

Yes you would have to double the listed "displacement" of a 2-stroke engine to compare it to a 4-stroke engine.

But since we are talking otto cycle automotive engine compared to wankel cycle engine the same thing applies.

Now just wait until they develop 2-stroke diesel atkinson cycle hybrid engines and we will see some fuel effeciency.

Even better would be a 2-stroke atkinson cycle derviative running on hydrogen. Talk about the ultimate.

 

is vegita just shane again?
bad spelling, dreaming in color with respect to power output... Nothing to back it up... hmmm

oh well, this has long since strayed from the original question:

 

wouln't 30psi on a centrige blower like that be detonation waiting to happen?

second if someone hasthat much money why not build it using a 350? usually just as easy to come by parts

also with all this money going in I would think a tranny would already be there


another thing is I have noticed he talks to the most trash, name calling and stuff is usually he who is full of the most... brown stuff from cows anus

 

Probably another ODB. What corporate block, bore, comp etc. are you running? I'll hold off on the bs flag for now, but it's there waiting.

 

and what u mean a 10 71 isnt that much blower are u jking and the reason y i did it was becouse i was told i couldnt finding the parts was hard with 20 cc dished in pistons i have not had a problem cept it only runs on race gas 120 octane and as ive said before i did not know what car this side show of a motor would be goign into and hey if u think this motor was a stupid think to do wait till u hear about my next motor i plan on building im thinking about anouther 334 with a gale banks twin turbo set up after my camaros done but that is for anouther day and for a transam and yes 1500 for a set of heads i only paid 600 for the heads my fathers a machinest he does all my head and intake work when i get pics i will send them

 

its a gm block with a forged eagle 383 crank and h beam rods with milidon 4 bolt main adapters 30 over 20 cc dished wisco pistons. brodox cylinderheads 205 intake 160 ex custom port and polish job tripple valve springs full roller crane rocker arms with stud guirdels

 

Ok let me get this straight, you have 2.05/1.60" valves in a 305 bore.

 

ODB?

Yea, just checking the math here, 2.05+1.6 = 3.65... Now that's if the valves are touching each other.... hmm ?

 

because being a teenager, I recognize that writing and its lack of punctuation. We all know that only comes from the retards who cant wipe their own butt. If you feel like proving me wrong, cheap digital type cameras can be had at walmart for like 5 bucks and it would be nice to see a good picture of the blocks casting number. If the motor is already in the car, i understand that may be hard to get that so then just take a picture of something obscure on it. Perhaps the water pump.

 

*** dame u guys are morons ill prove my **** on the track *** wipes u need to get some training or something becouse apparntly u have no real automotive training or experience to be talking as much crap as u are but thats ok becouse i do have the training and i do know what i am talking about so thats fine this will be my last post about this subject becouse it is worthless fighting against a tard and his rotary pos and the other tards that have no training yet are still know it alls all u are doign is showing ur own ignorance so its fine and for one thing its called a flared bore that is how 350 heads mate up properly to a 305 numb nuts have a great day and please go to school

 

I think you are proving my point and then some


if you ahve all this money you could easily afford to get a cam to take pics or hell even borrow one.
your still not giving out a whole lot of info on your motor build up
those heads yeah while you MIGHT be able to fit them are going to be so shrouded it's not even going to be worth it

plus with how you keep talking all this crap and name calling with all the defensive attitude it doesn't help your case any

if your going to tell us about this motor in your whole time of being here of 6 post

let us know more info and take pics

first off what are the specs on the cam?
lsa, duration, lift part and so forth
any part numbers on those pistons?
what size rod did you use and who makes it?
what about your rocker arms what ratio and who makes them?


another question that would be helpfull if you answer at what rpms would your peak torque be as well as your peak horsepower

 

I thought I was just a regular guy, but it turns out I'm a TARD! I'm happy, though, because it seems like the TARDs are the smartest ones here.

My daddy did my heads for me. Waaaah. I watched somebody else build my motor. Waaaahh.

Sorry, I might be getting a bit carried away. All in fun, right.

 

Are you 12? If not, you sure sound like it. Are you related to Shane in any way? If not, you sound like it too.

Do you know how to use the period key on your keyboard? You should give it a try sometime, its really not that much harder than pressing the spacebar. Once you master that, let us know, and we will help you out with the comma key, and shift. Shift is a bit tricky so practice on the others first.

Out of curiousity, do you talk the same way you type?

For those who had some doubt as to what to think of your 1000hp 9000 rpm 334, I think you've removed all traces of doubt from them yourself.