ok so i bought a 89 maro rs 305 tbi manual and loved it but wanted more power. wanted to build the stupid little lo3 into an asphault tearing concrete chipping smoke pouring testosterone adrenaline high ***** machine, remember, out of the lo3. you all know its possible but not worth it. i disagreed for a long time bout swapping to a 350. so i searched and bid and offered and ended up with-lt1 cam for lo3, another camaro v6 rolling chassis and gofigure non other than a 350 with abuot 80,000 miles on it out of a blazer 79 or 80!! so i guess i will go 350. now i guess i might as well sell the cam, put my 350 on a stand and tear the top end down and start to clean and upgrade. i know everything i need-to build a305 but not a 350. i dunno where to start with heads intake ignition. looking for the cheapest for best performance...so what do i need. possible might build the lo3 and put in in the v6 roller later down the road.

 

Building the 350 isn't that much different than building the 305. As long as you don't use the Blazer heads, or any swirlport heads, they can be made to work.

 

so question for heads then, which i guess you have made my first step, do i keep the stock heads on there and just get them ported? or what heads should i use.

 

Stock what heads?

Neither the 305 nor Blazer heads are worth messing with. L98, LB9, LG4, L69 - those are all worthy.

 

just looking for 350 heads right now. the 305 will get done after i pull it out and swap the 350 in the maro. i have learned alot about what came with what for 305 but not 350? just let me know if you get sick of me lol

 

305 L69 heads (416's) flow VERY well if ported or so I have been told but I don't know if they flow enough for a warm 350.

 

oh i c. idk how compatable the 305 heads even if ported will be for he 350 as i will be headering it caming and definatly intake.

 

well when ported and larger valves fitted they will flow enough (I think)
But they will bolt on to the 350 block no problems and I have heard that they will boost the CR up a little from stock 350 heads.

 

the reason why they jack up the CR is because the chambers are smaller creating a smaller area in order and the 350 pushing 45 extra cc's of A/F into the small chambers causes the higher compression numbers. definatly a cheap way to up the CR. im looking more for a good set of 350 heads and go from there i hate porting.

 

ah ok you could go Iron Vortec Heads + Intake they are damn good GM heads, The stock 350 H.O crate engine is 290HP and the Vortec one is 320HP so it will make a bigger difference to a warm/mild 350.

 

im also in the process of swapping my lo3 to carb for now just to get the car ready for the carb'd 350 that i have and to keep the lo3 running so i can get around here and there. i remembered reading about parts compatability from 350 and 305 and i was thinkin...wouldnt that 350 intake bolt right up and work on that 305?? if it does, hell all i need are new gaskets and all that. im just trying to get it swapped to carb for now, basically to put in the fuel pump afpr and all that. so leme know what ya'll think about that

 

if you can get your hands on a set of camel backs, those work well with a nice port job.. i laid down 316rwhp and 359rwtq with a 383 with P&P'd camel backs, an EPS manifold, and a 650 carb.. probably coulda laid down 360+rwhp and 400+rwtq with the rpm air gap and 800 carb..

 

not really looking for port work cuz there's only one guy around here who builds motors and hes high high high dolla and i dont have the time..also i have heard of these camel humps but never looked into the details b/c i heard they where shiti my main issue right now is 1-gathering parts and 2-identifying compatability with ALL 305 and 350 parts such as intake!

 

Vortec heads flow great unported. You just need an intake manifold to work with the vortec head, that'll cost extra.

 

The best cost effective combo I can think of is this.
Vortec heads - $600 new
Edylcrap RPM Airgap Performer - $200 new
Other than that it gets application specific as far as carb cam and headers.

 

You aren't going to find a better deal than one of these:

http://www.sdparts.com/product/SD806...formerRPM.aspx
http://www.sdparts.com/product/SD806...RPMAirGap.aspx
http://www.sdparts.com/product/SD806...RPMAirGap.aspx

Vortec heads require self-aligning rocker arms. These kits include them. Plus all gaskets & bolts.

 

I just saw a set of brand new heads off a factory 350 260hp motor for 93-99 vehicles. They were asking $250.00 including valve covers and rockers. 0 miles. These were on craigslist for Chicago I believe.

 

93-95 are swirlports. Either they don't know what they've got, or they're being deliberately deceptive.

 

nobody has answered my question about the intake???

 

If you go with one of the SDPC kits I linked, it will come with the intake.

This is assuming you go with a carb setup. Is that what you're thinking? Do you have emissions requirements to meet with the finished product?

 

I went back and checked the ad. The heads are not 93-99. They are perimeter bolt heads. Here's the ad and it' from from Grand Rapids.

Brand new pair of heads off a GM Performance Parts 350 260 HP crate motor. 76 cc cast iron heads. Includes heads, bolts, valve covers, rocker arms, ect.

Call 616-366-8968

 

Even worse.

The 260 horse engine is GM Goodwrench, not GMPP.

 

fivekid, im not funded properly to go straight up brand new set up like that i was just basically wondering what heads flow the best stock. these are easiest to find and machine around here, i have NO emmissions requirmenets as far as i know. i also dont know all the specs on this 350 i have bought weather its roller flat tappet or not i have no idea. thats why i kinda wanted to stick with my lo3 cuz i know what it has, but i wont.