As I check the catalogs at jegs, i see this for pushrods

7.800'' Standard,
7.850'', +.050'',
7.950'', +.150'',
8.000'', +.200'',


How will I know which ones I need for my engine i am building?
what is the determining factor? thanks!

 

length will depend on machine work done to the heads and block, chances are you need standard lenght.

 

seeing all the other posts you have, i'll give you a hand.

you not just going to be able to build an engine your first time by ordering everything from a jegs catalog all at once.

do a little more research. buy a engine building book or two. there are some pretty good ones out there.

and keep in mind, not everything you need/want is going to be in a jegs/summit catalog.

i would recomend having someone who knows what they are doing help you out the first time, or buy a short block and build from there.

once you get the cam & lifters in, and the heads on the engine w/ the rocker arms, you can use an adjustable push rod checker to see if you need different sized pushrods. depending on the type of cam going into the engine, hydralic or roller cam, you will need something different.

 

what im doing is pre building an engine thru jegs first to see how everything works, and im typing it all down in a document. after that, i am gonna study it and thats the best way for me to learn.

the block I have planned is a motown

@ jegs, the # is 955-084010

type that in to see the block I want, I would be getting it bored .030" over.

the camshaft I have down is

Adv. Duration: 272º/284º
Gross Lift: .454"/.480"


along with some hdyraulic lifters

jegs id # 270-99277-16

along with roller rockers

id # 778-66926C

i havnt decided on heads yet.

im assuming my cam is hydraulic?

 

i admire your ambition ( i was once there as well) but (not to be rude) but it seems your in a bit over your head.

you need to slow down, and examine your goals. because what you have going right now isn't going to be cost effiecent, or power effiecent.

first how much power are looking for.

250hp, 300hp, 350hp, 400hp?

emissions legal or no?

then after you answer that, you can look at what you need to meet your goals.

you might want to look into a crate engine. pre-assembled, ready to bolt in and go.

http://www.sdpc2000.com/cart.asp?act...tart&catid=120


if you want to build your own engine.

there is absolutly no reason in your case to buy the MOTOWN engine block. at $1,750, the only reason to buy an aftermarket block is if you needed the extra deck heigh for a extra large cubic inch small block, i.e. 434 or 454 SBC. BTW, the motown block doesn't come with a 4" bore. it comes with a 3.9" bore or a 4.115" bore. so i don't know what your trying to accomplish the the .030 overbore.

a .030 overbore is usually a matience procedure that you do when you rebuild a motor. after thousands and thousands of miles, the friction of the pistons on the cylinder walls, enlarge the cylinder walls ever so slightly. so a .030 overbore bores all the clyinders out to .030" larger than their orginal size, so they are all uniform in size, then you run a .030" larger piston.

instead of the motown blockjunkyards.
you can pick up a used 350 block for less than $50 at some

then buy a engine build kit, like a PAW kit, or a stroker kit, and have a machine shop build the bottom end of your engine.

or buy a pre-built short block and go from there. (http://www.sdpc2000.com/cart.asp?act...tart&catid=514)

the cylinder heads of an engine are the most important part in making power. the more money you spend on good cylinder heads, the easier it is to make power.

GM L31 vortec heads are a good budget choice, good for an easy 350-400 horsepower.

pro topline, AFR, Canfield, dart, trickflow, also all make good heads.

these are just examples of what you can do. just remember that are plenty more choices for powerplants out there.

just don't limit yourself to what you can find on a jegs or summit website, because there is so much more out there.

also, buy a good book with tons of pictures on small block chevy performance engines. that will give you a lot more understanding of how everything in the engine works together, and will answer most of the questions you have.

 

I do thank you truly for your help.

what im trying to do is just build up a cali emmissions legal engine doing a minimum of 300hp/300tq

boring over wont do anything for increased performance?

And currently I was looking at world products heads.
the higher cc the higher compression correct?

nevermind, ill save that question for a different post.

and all im trying to do now, is pre build an engine off jegs website just to get an understand of what works together and what doesnt and get a price range of what it will cost me. these are not the final parts im sticking with.

I plan to leave the heads standard (no extra machine work)

and i still want to bore a block .030" over though, if I go to a junkyard and get a 350 their, im sure its gonna need boring

so does the standard pushrods still hold true?

 

the lower the cc, the higher the compression, higher cc=lower compression.

with a factory engine block, out of the box heads, and a hydralic cam, standard length pushrods will be fine.

but as a little more advice, don't use a jegs catalog to get a ballpark price of what your engine will cost.

 

a little too late for that advice

im halfway done. but im still already learning a buttload from just reading the descriptions and their requirements with other parts.

even with the 30 bore, will the stock's be fine?

 

buy a couple of length checking push rods or make a couple and figure out what you need then order a set