GokuZ06Roc

I'm new at building engines and am swapping the old 305 tpi to a new 350, the 350 I'm going to be getting is just the plain jane GM Goodwrench 350 long black, but i'm wondering it comes equipped with a flat tappet cam, which i'm going to be changing out to a comp cams extreme Hydraulic roller unit, the heads are World sportsman II, assembled with hydraulic roller valve train, I'm wondering if there's something with the block that has to be done to make it hydraulic roller? or can i just put the cam in then the heads and it won't make a difference, again i am new at building engines so be nice on me if this is a stupid question.

xpndbl3

iTrader: (5)

unless it's a roller block then no you can't put it in cheaply. you'd need retrofit lifters which are pretty spendy. Personally i'd just get a hydraulic lifter setup and go with that if the block is not setup for a roller cam and pocket the extra 250-300 you'd waste for 10hp.

five7kid

iTrader: (14)

Since you're throwing the heads & cam away anyway, why not just get a shortblock? http://www.sdpc2000.com/catalog/514/...e-Assembly.htm is roller-ready, although you'd need to get a timing set. But, your current (assuming a stock '87 engine) lifters, retainers, pushrods, etc., would all work. It would be one-piece rear main seal unlike the Goodwrench. Your tin would all fit as well (although I don't recall if the Sportsman II's accomodate center-bolt valve covers).

GokuZ06Roc

so i should be expecting about the same flywheel horsepower numbers with the L31 block setup? I'm probably going to be transfering most of the parts from the 305 to the 350 so even timing chain set might also be transfered if possible. The 305 is fairly new with only 4000 miles on it but just is a lil too weak especially with the new tires and it's not hooking at all the engine is jus to weak its just sucking. So most of the valvetrain should be in one piece hopefully and reusable. The Cam is a Comp Cam Extreme 112LSA .502/.510 so i'm wondering if the stock lifters and rockers will be ok for this setup.?

GokuZ06Roc

oh forgot another thing the oil pan will that have to be replaced? I will probably replace it anyhow seeing how my pan is crap, I'm wondering if anyone has a good one that would fit the application. Hopefully one that is baffled,

five7kid

iTrader: (14)

The L31 is of the same "era" as your '87 305. The Goodwrench 350 is '85-earlier type. If your Comp cam is a factory roller type, it won't work in the Goodwrench engine, but it will work in the L31 shortblock.

The L31 would be a much better place to start than the Goodwrench.

GokuZ06Roc

Awesome, thanx Five7kid, I just did a lil homework on small block chevys , well actually within the past like 2 days i've read 2 books about small blocks and my application by just sitting in Barnes and Nobles book store just reading the book and drinking Starbucks coffee. So i'm pretty much good with the setup then, well it's cool i'll dish a lil more moola for the shortblock and i was figuring even if i had the heads and cam from the goodwrench it's not like i'd get much money for it plus this would save time in assembly. Now i know that the knock sensor has to be replaced, this is a MAF car so things are fine there. Thanx alot I'll post some pictures of the swap.

GokuZ06Roc

also if anyone could help me with maybe injector size? I'm expecting this motor to be in the 350-400 horse range so if anyone can throw me in the right direction there, I just ordered that shortblock, and just got in all the parts for the Holly Stealthram, including the throttle body, fuel rails with adjustable regulator etc...etc... the camshaft should be coming also sometime one of these days.

five7kid

iTrader: (14)

24 lb, most likely. Hear the Ford SVO parts (I believe that's what they are called) work well.

hoogabooga

iTrader: (1)

did you find out if a 305 oil pan will go on a 350? i was wondering the same thing.

five7kid

iTrader: (14)

It will fit if it is '86-later.

GokuZ06Roc

are 30Lb Injectors seem to overkill? i just want it to have enough fuel. 24 lb seems low. When used on a 383 i think there's an article on compcams website here http://www.compcams.com/Community/Ar...?ID=1737510521
i think a few pages down it says they used 36lb injectors , i was thinking maybe 30lb injectors wouldn't be so bad seeing how some of these setups were in the 500 horse range but still i'm expecting maybe mid 300's to 400 horse with this setup.

GokuZ06Roc

anyone? I've used the formula on Hollye Site and comes out to be like 25-28 lbs depending on percentage of WOT

GokuZ06Roc

i'm sorry not WOT but precentage of Static flow or whatever