305 head

[4cylpro]

I have a 305 sbc an I was wondering if the Dart por 1 Top End kit from jegs would still fit. I was reading that it would but being that it's different displacement I didn't know if it would fit or not. It just says its for a SB-chevy so I don't know. Any help would be appreciated. The link is at the bottom.

http://www.jegs.com/p/Dart/Dart-Pro-1-Top-End-Kits-for-Chevy/760038/10002/-1

[SleeperGoat]

is there anything done to the 305? If not i dont think its even worth it you could find another motor for that amount.

[devildog214]

i was looking a cyl heads for my 305 l69, trick flow makes a nice cheap pair of aluminum heads, complete except for rockers for like500. Those are reccomended in a few 305 builds, and i know this guy who used em in a lq4 305, full roller rockers, eddy performer, comp xe262, and its doin great, no dyno sheet yet though. And keep in mind its dished pistons on the weaker 305s and flattops on 305 h.o. and 305tpi. And 68cc chambers seems a bit much,58cc would keep compression up. Also 1900 dollars is alot for a top end kit without a cam, 1700 can buy you a 290hp 350 brand new crate engine. I would suggest a eddy performer or victor jr, for like 300, these trick flows for like 500, you can still keep your centerbolt valve covers. i have the link on my home computer. But yeah then get new rockers for under 100 probably, then you would still have alot leftover for a cam.

[4cylpro]

yea but i'd like to just build the 305 to be different. I don't have the money but i'm still researching on the motor and I'm finding some good stuff for it. I'm just seeing what you guys know about them. I have a 1979 chevy impala that i just got for my first car an I don't know if i really want to swap a 350 into it. would it be a direct bolt in? I didn't no if it would just bolt in or not. An would I have to get a motor that's from that year or made for that year, or can i just get a 350 sbc? If it would just bolt in I think I might just go that way with a 350. Thanks for the answers guys!

[SleeperGoat]

Pretty sure you can just drop a 350 in as long as it's carbed an not electronic then it would get a bit tricky. When we swapped out my 305 for the 350 we had to remove the ecu an the electronic carb junk besides that it was rather quick. I might be forgetting something though that was 9 years ago.

[4cylpro]

Alright thanks I think I might just swap it to 350! that's for the info!! I'm going to start a journal on it so you guys can keep up to date with the project.

[4cylpro]

Thanks for the info I meant to say

[4cylpro]

Does anyone know what the stock valvetrain can take as in cam duration? I was thinking of getting COMP Cam with a 280 duration but I don't know what the most the valvetrain can take. Any info would be appreciated.

[SleeperGoat]

What rear is in it sn tranny?

[4cylpro]

I'm not sure what for rear it has. I got it yesterday for my first car. The trans is the 3 speed auto. I'm going to get an exhaust, longtube headers, an cam for now. till i save some money.

[4cylpro]

http://i1018.photobucket.com/albums/af307/4cylpro/l_befe57a447544817b085931e264f059a.jpg

[devildog214]

nice shape, yeah your gonna want the 350 eventually to move all that, and i thought my ss was heavy. I would do, headers/exhaust, rearend, then cam. Yur probably have an open end unless you have a civilian police package with posi.

[4cylpro]

yea! thats what I'm thinking. It only has 76,000 miles though!! very low miles.

[4cylpro]

devildog214- do you know like the h-body an g-body an all them? If so can you tell me which body mine is cause I was looking on Jegs for an exhaust kit for it an ( I think it was) G-body cause my year fit it. I'd like to get an exhaust instead of having to custom build one. If you know of any other place besides Jegs and summit that would be greatly appreciated. Thank you

[SleeperGoat]

Its a B- Body

[4cylpro]

but on jegs the exhaust for a b-body was a different year. Like the cars year doesn't fit into it you know what I mean? I'd like to stay away from a full custom exhaust for it, cause I'd like to just bolt it up an go. But if i have to i'll just custom fab an exhaust.

[4cylpro]

for the passenger car one it says that its from years 1955-57? That's why I don't think it would fit.

[SleeperGoat]

Production 1976-1985
Model year(s) 1977-1985
Assembly Arlington, Texas
Oshawa, Ontario
Body style(s) 2-door coupe
4-door sedan
4-door station wagon
Layout FR layout
Platform B-body
Engine(s) 229*cu*in (3.8*L) V6
231*cu*in (3.8*L) V6
250*cu*in (4.1*L) L6
267*cu*in (4.4*L) small-block V8
305*cu*in (5*L) small-block V8
350*cu*in (5.7*L) small-block V8
350*cu*in (5.7*L) Olds diesel V8
Transmission(s) 3-speed automatic
4-speed automatic (optional, 1981-1985)
Wheelbase 116*in (2,946*mm)
Related Chevrolet Caprice
Pontiac Parisienne

been looking into when I was bored at work 305 was 170hp.

[Streetracer1227]

very nice....in my opinion, for what you would spend hopping up a 305, you can put a decent 350 in the car, and have lots of room for improvement. all the mounts are the same and everything. the problem with the 305 is the small bore (3.76 inches) vs the 350 (4 inches) which limits your cylinder head selection and how big of a valve you can run. world products makes a head for the 305, but i dont remember the exact name. whatever you build, i would go with a head that has about a 190 cc intake runner with ~ 270 duration cam, good dual plane intake, and a reasonably sized 4 barrel carb, and it will run good on the street

[4cylpro]

To swap in a 350, do I have to do any wiring for the different motor?

[Streetracer1227]

To swap in a 350, do I have to do any wiring for the different motor?

shouldnt have to unless you go silly with electric fuel pumps, crank trigger ignitions, and stuff that you only see on high end motors...the only wiring on a car that old is lights, dash harness, and ignition....it would probably be wise to get some gauges (at a minimum oil pressure, water temp, and tach) which would have to be wired in, but a replacement 305 distributor should work in a 350

[4cylpro]

Ok thanks, I already have a Tach in an I'm getting a water temp gauge this weekend. If I have enough money I'll also be getting the oil pressure gauge.

[shadowfaxss]

Josh.....let me look into it for you. It would be better to do a swap (the motor should fit in) than to build the the 305 boat anchor.

[4cylpro]

Yea your going to have to help me cause I'm going to need help!!! You should come over and check it out!

[4cylpro]

See the thing is, is that since I just got it last weekend so I can't really do much to it, an I need decent gas mileage for school. An I no right now my dad won't let me swap the motor UNLESS it blows cause it took me forever to convince him for me to be able to get an exhaust. So I'm just going to get a small cam for the motor and let it at that for alittle till I can swap it.

[shadowfaxss]

It's not worth doing anything to the engine......170hp is the rating and a cam won't do much except take some money out of your wallet. Save your money for either a swap or another car.

[4cylpro]

Yea I'm going to save my money, an go to the junkyard the in adamstown an see if I can get a 350 there. If not Then go to EZ pull. But I'd like you to come take a look ant it cause I'm not sure if long tube headers will fit into it.

[devildog214]

if you cant swap the engine right now id say exhaust and rearend to prepare for that 350. Emissions legal headers are about 400 to 500, but if you can get away cheap go for it. And rebuild that 7.5 with stronger components, an eaton posi, and better gears like 3.73s or 3.42s make alot of difference.

[4cylpro]

Yea and what do you mean? Are long tube headers not legal, Even though the car is older then 25 years? An deff 3.73's!

[devildog214]

well im not sure how different your emissions are from my car but, on the manifolds theres a set of tubes called a.i.r. tubes on each manifold that pump fresh air into the exhaust from your "smog pump". Edelbrock sells em, shorty headers with the a.i.r. tubes and y pipe for a g-body, also its important to get headers that will allow you to bolt up your a/c bracket, unless you want to fabricate or its gonna be a hot summer. Then if your running an computer controlled quadrajet still, find a place to weld a 02 sensor bung to either the drivers side header collector or immediately after the collector. Idk if this concerns a b-body or not but for a g-body its impossible to run "true duals" without swapping the crossmember. A good emissions legal exhaust would be those headers (make sure you get them for a slip on cat and not one with a 4 bolt flange) maybe a new cat, and a 2.25 or 2.5 inch catback with your preferred mufflers. But if you have your ways about getting inspected more easily, it starts involving less money and more fabrication usually.

[SleeperGoat]

If he swaps to a 350 his car probably won't pass emissions anyway cause the will have to run it as a 305 car not a 350. I had the same problem with my Camaro when I went from a 305 to a 350 but I was lucky cause I didn't drive over 5k a year in that car. If he throws classic tags on it he'll be fine.

[4cylpro]

well im not sure how different your emissions are from my car but, on the manifolds theres a set of tubes called a.i.r. tubes on each manifold that pump fresh air into the exhaust from your "smog pump". Edelbrock sells em, shorty headers with the a.i.r. tubes and y pipe for a g-body, also its important to get headers that will allow you to bolt up your a/c bracket, unless you want to fabricate or its gonna be a hot summer. Then if your running an computer controlled quadrajet still, find a place to weld a 02 sensor bung to either the drivers side header collector or immediately after the collector. Idk if this concerns a b-body or not but for a g-body its impossible to run "true duals" without swapping the crossmember. A good emissions legal exhaust would be those headers (make sure you get them for a slip on cat and not one with a 4 bolt flange) maybe a new cat, and a 2.25 or 2.5 inch catback with your preferred mufflers. But if you have your ways about getting inspected more easily, it starts involving less money and more fabrication usually.

I put in my model, year, an engine size in summitracing.com an long tube headers came up. So I think they would fit, an also if I remember correctly I don't have the a.i.r tubes. My dads 89 silverado does but I'll check when I get home from school today.

[devildog214]

yeah longtubes will fit, sometimes you have have to put a few dings in them to get em to go in. But if you've got a.i.r. they only sell shortys that are emissions legal. Also remember the a/c bracket, you could probably fabricate something if you dont wanna go searching everywhere for a header with the correct holes that bolt up to your a/c bracket. It will definitly save you alot of money, but alot more work.

[4cylpro]

Alright will do! I'll be looking at the A/C brackets to see if they would fit! Thanks guys for the answers!

[Streetracer1227]

If he swaps to a 350 his car probably won't pass emissions anyway cause the will have to run it as a 305 car not a 350. I had the same problem with my Camaro when I went from a 305 to a 350 but I was lucky cause I didn't drive over 5k a year in that car. If he throws classic tags on it he'll be fine.

its over 25 years old, so he can get antique tags for it, so no inspection, no emissions, they just dont want you using it as a daily at that point. either way, it should still be emissions exempt after age 25

[4cylpro]

Yea it's going to bee my daily though that's the thing. Either way I don't think I'll have emissions testing like Streetracer1227 said.

[Streetracer1227]

if your still lookin to do a 305 build theres an article in super chevy this month about it

[4cylpro]

Hey thanks alot. I was planning on doing a lt1 swap later down the road, but I might do the 305. 500+ hp all motor! I'm deff picking up this issue of super chevy! If I can still get it.

[Streetracer1227]

its the july 2010 issue, has a blue 70 chevelle on the cover

[4cylpro]

I'm getting the magazine today! I was on their website and the article is on the z/28 302 correct? That's what I was reading about.

[Streetracer1227]

I'm getting the magazine today! I was on their website and the article is on the z/28 302 correct? That's what I was reading about.

i think that was from a month or 2 ago....the build i saw was a 305 out of an 84 camaro...the 302 and 305 are 2 completely different engines

[4cylpro]

Yea that's what I was thinking. I'm going to search the Super Chevy website to see if I can find it. What color is the camaro?

[4cylpro]

Hey I have a question. If I would swap an 305 out for an lt1, what would I have to do about the wiring? Like if I would want to keep my stock gauges an th350 trans. I was looking on Painless Performance but it was for the lt1 with 4l60e/700r4 trans. I just want to know if it would be possible to use the painless harness for the th350. An use the stock gauge cluster.

[Streetracer1227]

the 700r4 is essentially a th350 with a longer case and an extra gear. the 4L60E is basically an electronically controlled 700r4. the trans control module is built into the factory ecu on the lt1 cars. it is possible, as i have seen some lt1 cars with non-factory transmissions (Stock/Super Stock cars and high power street cars), but not sure of all the details to make it work. refer to www.ls1lt1.com and see if you can find any pertinent info

[4cylpro]

So if I would put the lt1 with the the stock th350 trans, all I need is the part of the wiring harness for the fuel injectors, sensors, ect at the motor. An the ECU for the lt1.

[94503]

no wiring changes just drop in only wired u should have r the ones from alternator and a power to distributor and a tach wire coming off it

[4cylpro]

If I was going to get a th400 trans rebuilt for high hp. What would the max hp be? I've seen th400 trans for sale that can withstand up to 950 hp. Could I get a bigger max hp rating? I don't think I will ever get to it but I'd like to make sure my trans can handle the power. Like in case I would run nitrous or boost.

[SleeperGoat]

If I was going to get a th400 trans rebuilt for high hp. What would the max hp be? I've seen th400 trans for sale that can withstand up to 950 hp. Could I get a bigger max hp rating? I don't think I will ever get to it but I'd like to make sure my trans can handle the power. Like in case I would run nitrous or boost.

Mines good for 1500hp though it was costly its not really worth going the overkill if you dont need it. Though if you think with nitrious your gonna be close to 950+ then more power to ya.

[4cylpro]

The th400 trans has 4 forward gears right? I can't remember but some places I was seeing three and some four I just don't remember.

[SleeperGoat]

I've only ever seen them in 3 speeds an as far as i know i'm pretty sure they only got in 3 speeds.

[4cylpro]

What would be the best all around rear end gears? Like for 5 speed cars the 3:73 gears are the best all around.

[SleeperGoat]

What would be the best all around rear end gears? Like for 5 speed cars the 3:73 gears are the best all around.

I have 4.11 currently but I'm also planning on 28" tires

[4cylpro]

How is it on the highway? Like if your rolling at 65-70 what are your rpm's?

[SleeperGoat]

I dont cruise it on highways lol when i did max speed was 65 at 3500rpms even then i was kinda worried about long rides with it that high.

[4cylpro]

Since the a 406 is a short deck block. if I would go with the tall deck for a 434 could I use the same intake manifold? It looks like people are using the same manifold.

[SleeperGoat]

I'd have to ask my engine guy my intake manifold is massive had to pick up a 6" cowl to fit it under the hood lol.

[4cylpro]

Will a 454 bolt up to a th350 trans?

[4cylpro]

^^^scratch that. I think I'm going to stay sbc.