building a 305

now before you tell me to throw it in a lake, bite your tongue cause i really dont care.

ok, i've got a 1990 305 from a camaro sitting in my driveway, and have some ideas rollin around my head as of what to do with it. i dont have a vehicle to put it in as of now, but i'm waiting for that blown camaro to come along for little of nothing.

it's got over 150,000 miles on so it's definatly gonna need bored due to the ring lidge, but i was thinkin of strokin it but to what i haven't decided yet, any ideas?

i've got 1 pair of 305 heads, and a pair of 350 heads both cast iron. i'd like to keep it 58cc, but i dont want the small valves. is it possible to machine the 350 heads down to stay in the 58cc area? or just get different heads?

it's got the roller cam so i'll stay with that set-up and just get a bigger cam.

i'll worry about induction later, i just want some ideas about the rotating assymbly. any ideas, right or wrong throw em out there i'm not in a hurry :smile:

just this past weekend I read an article in Chevy High Performance mag where they made a 305 vortec motor, using vortec 350 heads. Hit their website up, it should be there.

What about strokin' it to a 340?
CAST 3.750" stroker crank
hypereutectic flat top pistons
Ide get clevite bearings and sealed power moly rings

Get it all balanced? What kinda power do you wanna make with it?

i have a set a 305 high output heads for sale.
1.94 1.50 valves were installed, ported and polished with triple valve springs. have about 5k miles on them since they were totally redone.

steal some parts, and maybe the engine from your cousin's boyfriend's camaro, he probably wont notice, if you exchange the engine...

steal some parts, and maybe the engine from your cousin's boyfriend's camaro, he probably wont notice, if you exchange the engine...

lol, that car is worthless

What kinda power do you wanna make with it

well that's what i was wonding, was how much power i could squeeze out of this thing, being stroked and with the right heads, and naturally aspirated

wheres 92rs... he could tell you how to make one badass 305

PM 92RS on this, hes the 305 guru, number one guy to talk to in my opinion about these engines. key thing to remember, ESPECIALLY if you stroke it, is that your gonna want to focus on building an engine with a low rpm powerband. the small bore and long stroke will be great for torque, but not hp, and will have awesome port velocities at low rpms, so essentially, youre makin a great truck engine.

oh and chamber size, remember the 305 heads have the small 59cc chambers, but somewhere around 20cc dished pistons i think. a set of flat top pistons should allow you to use the 350 heads without modding them, although i have read about fully modded race vortec heads being angle milled from 64 to 54cc's

Your 90 heads should have 1.84 intake valves. Bigger valves can be installed but then you can get into intake valve shrouding. Or you can buy the World product heads that are set up for 1.94 intakes. They changed the valve centerline to help with the shouding. Thats the bad thing about small bores. And I built a 334 stroker 305. Ran pretty good. But you have to use the 400 rods and that creates lots of cylinder wall loading.

the 305 heads that i've got are from a much older 305, cant remember what year, but the casting # is 354434. i looked it up once but i cant remember what the year was. the 350 heads the i've got are 1971. both heads dont flow for shit, but the 350 has bigger valves i'm pretty sure

there's always a set of world products torquer 305 heads.

The chambers are too big on the 350 heads for a 305. Too much compression loss. Machins shop can install the larger 1.84 intake valves. I just had it done. Infact he had a few sets of the later one with factory 1.84's that he said I could trade for.

The center bolt and H.O. heads had the 1.92/1.5 valves, but I would get ahold of a 335 stroker kit from powerhouse engineering www.enginekits.com I swear by it, then for around 700 bones you can get the S/R torquer 305 heads. To top it off I'd go with an edelbrock performer RPM intake, unless you've got emissions and putting it in a "legal" car then you have to use the performer. After that you have the choise of EFI or carb. If your gonna stick a TBI on it, holley 670, carb, a 700 vac secondary, or steal a TPI off of something. You'll be able to push it to around 6400 rpm but your power band will probably cut out around 5800 or so depending on your cam choise witch by the way edelbrock performer rpm is pretty good but has kind of a low lift, but go to compcams.com and check out what they have as far as the extreme energy.

ah...ok here i can help you ....--sighs-- ok how much money are you planning on spending? if you want to do it cheap....carb it anything around 600 cfm will be good. , performer manifold, a pair of vortec heads, ported and polished,1.94 / 1.5 or find a set of 416 casting which are lb9 heads ....some will swear they are lg4 but bleh whatever....either or....you are in luck cause...its roller :D a USED lt4 hot cam its roller, itll work, and itll be SICK. SLP headers.. i stress slp, bigger, better, mandrel bends....less restriction. now if you have money, build your own TPI system, dont just buy a used junk yard one. get a STEALTH RAM tpi system, build on, youll need an ecm distributor sensors wiring etc.....(i suggest a carb due to simplicity) or if you plan on running a ton of nitrous, super charger or a turbo...L98 heads would work due to the 64 cc chambers and itll drop compression down to like 8.7:1 and thatll be good enough.

OR you can stroke it.....

OR you could use it as an anchor

OR could make a mean coffee table with it

OR....the list goes on..... it depends on how much money you want to put into it.... :D

money isn't really an issue. like i said before, i dont have a vehicle to put it in yet. so i can build it as i get the money. i do know that i want to stroke it, and i've heard good things about S/R torquer heads. so i'll probly go with those or vortec's. as far as induction goes, i'll worry bout that when i get there. i've build and transplanted fuel injected motors before, so i'm well familiar with that. just depeding on what vehicle i get a hold of to put this thing is will determine weather i go EFI carb. i'm not a big fan of aftermarket fuel injection set ups so it'll be a modified factory set up if i go that road. emissions arent a problem either. and nitrous is definatly out of the question, i dont like it, never have and never will. but supercharged is starting to intrigue me a little, but that's way down road. thanks for all the ideas and keep comin :smile:

I've got a 91 z28 with a 305 tpi, and I'm wondering about a camshaft myself. I'm not an expert on cams at all so I'm wondering what I could put in that might pop right in without needing new lifters or anything else. It's also an automatic so I don't have the bigger cam that manual came with. Anyone have any ideas? If nothing else I'm wondering if just that manual cam would fit in, like I said preferrably no other modifications...

roller cams tend to run a little more in price than flat tappet. i'm not sure if you can use a flat tappet cam with roller lifters.

no you dont want to mix flat tappet and roller, flat tapit cams have a tapered surface to make a flat tapit lifter rotate in its bore, where as rollers need a flat surface. if you are confused about what cam to run with, i suggest you give comp cams cam help hotline a call, they are the experts and will be able to give you the best advice. they also offer computer compatable cams in many cam lines. i personally have been impressed by the xtream energy cam line.

I really don't think that LT4 hot cam will work. I believe you'll have piston/valve clearence problems due to the high lift. And the stealth ram is probably a bit too much induction for the 305. Even if you stroke it it's still a small bore. Another thing I read from someone else about using a small valve 350 head, a big thing with 305s more so than 350s is compression. You want to stick with the 58cc heads and about 10:1. The 350 is more forgiving when it comes to compression. Think of of it as a balloon. To little air in a small balloon and it'll go flat quick, the more air the better, till it pops. With the 350, it's a bigger balloon so less air will keep it going for a bit longer, but again more air is better(air being compression). And be sure to get the non pump up type lifters, good low end torque and then when you punch it they lock up and give you full range of your cam.

You shouldn't have any valve clearence problems with the hot cam. I'm running over .500 without any problems. .535 and .555 on a roller. Would be on the big side for a 305 though.