Goodbye 305 HELLO 350!!

[bikerboyriley1]

So my 305 has crapped out unfortunetly, ihave decided to build up a 350 30over and want to do as high compression as i can while still using pump gas of some type, also i would like a pretty big cam and was wondering what you guys use, soo what im getting at is if you could build as high performance 350 as possible what parts would you use!

thanks for the advice!!

[rayL]

Thats a vague question. Do you want to use off the shelf parts? Standard heads? iron or aluminum? gotta know what we are gonna be working with. If you want a super stout street motor then your gonna want cubic inches. 383 is to standard now id go 4.030 bore 4 inch stroke.. 408 cubic inches. just an idea, but you gotta let us know more of what your trying to do.

[bikerboyriley1]

i want to do a 355, with shelf parts and aluminum heads, i want high compression also is 13:1 easily attainable?

[rayL]

The highest compression i think you could get away with on pump gas is around 10.5:1. Is this a street truck?

[bikerboyriley1]

yes this truck will be street/ strip

[grimpuppy]

On 2006-12-24 20:31, bikerboyriley1 wrote:

i want to do a 355, with shelf parts and aluminum heads, i want high compression also is 13:1 easily attainable?

It is attainable, that is the compression ratio I run... Plan on running VP C12 fuel or equivalent. It is only $6.50 a gallon http://www.s10v8.com/images/smilies/icon_mad.gif Thats why mine is only driven 1/4 mile at a time.



For most kind of street playing, torque is where it is at. You will never use 500 HP between stoplights.

Let us know the exact plan for the truck and we can let you know what has worked and what has not for us.

[bikerboyriley1]

Well the plan is to have a street truck that is fast .. that i can also take to the track on weekend! I want a pretty radical cam and just something that people will not know what hit them! soo maybe 10.5:1 compression ratio is a little bit more practical for street use....

[bikerboyriley1]

sorry i seem a little confused this will be my first engine that is being completly rebuilt and i just want something i will be happy with!

[Scotty_S-15]

On 2006-12-25 03:23, bikerboyriley1 wrote:............................. I want a pretty radical cam and just something that people will not know what hit them! ....................

Well, if you\'re looking for that, then you DON\'T want a \"pretty radical\" cam. Just be careful not to make the very common mistake of too much cam. Just keep in mind that while a more radical cam usually makes more HP at the higher RPM ranges, it is at the cost of losing HP in the low ranges. And, even when racing, particularly with streetable gears & converter, you are in the lower & mid RPM ranges at times.

.............. Regarding the compression ratio & pump gas, 10.5-1 might be marginal with aluminum heads, and probably a little too much for iron heads.

............. Do you have the 350 yet? If not, I\'d try to find a roller cam block.

.............. And might I suggest looking at the Edelbrock E-Tec top end kits, with heads, cam, & intake manifold. They\'re a matched, dyno proven combination that\'d be nice street/strip setup.

[gdmclnh]

This a very complex subject. You can run as high as 10.5 compression ratio, but there are a lot of factors to consider. Cam/heads/piston/deck height/head gasket thickness combination is critical. Go to chevytalk.com and read the performance forum about dynamic compression ratio. There is a library full of information there about running higher compression ratios on pump gas. 10 to 1 is usually considered the limit with iron heads, 11 to 1 for aluminum heads when using pump gas. Good luck.

[bikerboyriley1]

im almost leaning towards a crate motor... im not sure f it would be cheaper or not.. but also i found a good kit but its .040 pistons... is that too big?

[rayL]

get ya a zz4 or something similar crate motor and im sure you will be happy

[bikerboyriley1]

i think crate motors are out of my budget.... but im still planning on building a 2000-2500$ motor just i need to be smart on where i invest my money

[riotpolice75]

$2 - 2500. easy enough. keep an eye out on ebay and hit the junk yards for a 4 bolt truck block. 1500\'s on up including suburbans and tahoes will have a 4 bolt motor. keep your eye out for an 86 or later block. preferably an early 90s block. theyre roller blocks from the factory. if you can, check under the timing chain cover for either the numbers 010 or 020. 010 means the block was cast with a higher percentage of tin in the casting. 020 means it was cast with a higher percentage of nickel. the high nickel content blocks are the ones to go after. the castings are harder and alot less prone to wear. the last 020 block i had apart had almost no step at the top of the cylinders and the motor had over 150,000 on it.



get the motor home and get it apart. have a good look at the rotating assembly to determine if you can reuse it or not. spend a few hundred and send the block to the machine shop. they can check it out alot more thoroughly than you can. if you dont have to have it overbored then dont. whole rotating assemblies can be had off of ebay, jegs, summit, scoggin dickey, etc. for like $600 - $800. vortec heads can be had from a whole bunch of places for $200 used up to $550 new from GM. from there get you a performer RPM and a demon or an avenger 750. then cam choice is largely up to you.



like gdmclnh said. its a real complex subject. personally, i could fill up 2 pages with \"basic\" information. but like you said; you need to be smart of where you spend your money.







smith