fresh l03 ,with upgraded vortec heads from here and put in this cam and also use a edelbrock performer rpm vortec intake ,and a 650 cfm edelbrock carb. all opinions welcome. thomas

 

Perhaps 275-300 HP flywheel net (assuming you shave the heads to 58cc), no bottom end to speak of, would require higher stall and gears to get off the line, wouldn't chose that carb.

Pretty much a waste on a 305 block, especially if you're talking about rebuilding the shortblock.

Opinion #1.

 

57, I'm just wondering, why would you think that setup would have no bottom end?

210/215 @.50 isn't that big of a cam, I was about to say that was a very small cam until I noticed it was a 305.

What is the stock compression of that engine? If anything all of those parts would be transferable into a 350 at some point....so it wouldn't be a "waste" of parts.

I dunno, the whole cam thing has me confused though....someone else was running a cam of similar duration like 215/215 (single pattern) and someone said that the cam was good to 5500. I'm running 224/230 and I have a pretty smooth idle. I don't know how different a roller setup is, but 210/215 sounds kinda tame, even if it is a 305. My car wants to break loose pretty easy...

 

how in the world is that not gonna have low end its basically a step up from the stock l98 cam and i also have 3:42 gears the factory compressio is 9.3:1 so all i would have to do is use a .015 thick head gasket (factory i think is .035 thick) to get comp back up to a respectable level. i mean i know the l98 is a 350 and i have a 305 but geesh it shouldnt be that radical of a cam even in a 305. and the vortec heads flowwwwwwww way better than stock swirlports anyway and have larger valves . anyone else with opinions please reply.

and 5.7 not flaming im just a little confused on why you said that is all. thanx for responding,

thomas

 

Hey, you only asked for opinions...

The combination of heads & cam intended for a larger engine will hurt low end when used on a smaller engine. No, it isn't that radical of a cam, and I'm not saying it won't be able to get out of its own way. But, the power band will be shifted up significantly, so you'd better plan on increasing stall to let the engine get into the power band as soon as possible.

The cam in my 305 is 216/228 @ .050, .464/.480, and it doesn't really start to pull until 3000 RPMs. For around-town driving, sure, it gets going fine, but when you go WOT, it just doesn't get going until 3000 RPMs (still better than the LG4 was, though). I under-did it with stall. The cam you're talking about isn't much below mine, so 2500 is probably the bottom of the real power band.

The head gasket alone won't be enough to make up for the increase in chamber size. Flat top pistons with 4 valve reliefs, 58cc chambers, and steel shim gasket = 9.5:1 CR.

And, just to re-emphasize the point, rebuilding an LO3 bottom end is flushing performance money down the toilet.

 

I won't touch the 305 - 350 debate....it's been done to death.

As far as the Compression ratio issue...

ALL other things being equal, a 1cc drop on the head's combustion adds .1 to the compression ratio. Reverse is true as well, drop 1cc, drop .1 on the compression ratio.

9.3:1 w/ 58cc = @8.7:1 w/ 64cc

And don't forget, you WANT / NEED to keep the quench ( distance from top of pistonto flat part of head ) CLOSE to .040 . Too much quench height and you'll INVITE detonation. I won't go into the whole theory / dynamics behind this...research it if you're interested. But take note...With TOO much quench area, you can end up with an engine that detonates more with a LOWER compression ratio.

Quench = thickness of COMPRESSED head gasket + deck height ( distance of your piston DOWN in the bore.

Just someting to keep in mind.

 

I wasn't arguing that part, only the part about "fresh LO3" - assuming that meant rebuilding the current 305 bottom end.

 

I already done a rebuild on the 305 last yr has maybe 600 miles on it since im working on the body work right now so all i would be doing is upgrading the top end of the engine(heads ,cam,intake ,etc.....) already has fresh bottom end. just to get that out of the equation.

 

I know more of you have opinions on this.

 

well i guess ill give up on getting any other opinions on this , and just start on completely new engine combo since hardly anyone gives a crap about someone modding a 305.....

 

Are you trying to build something on the board, or in your garage?

If you can't tell from my sig whether I care about building a 305, then I won't try to convince you any further.

What you have to decide is whether the 305 is the final product, or a step along the way. The unfortunate part about the latter is the heads that work well on a 350-up will hurt a 305 and vice versa.

That package you proposed in the beginning isn't a bad one, necessarily. I'm not a particular fan of Vortecs, and even less so on a 305. But, that doesn't mean they're a bad choice. If you don't shave them, the 305 will suffer a compression loss. If you do shave them, effective use later on a 350-up will suffer.

What exactly do you expect us to say?

 

I wasnt insulting or flaming with you or anything bro , I was speaking about most people (you know someone has a 305 lets just tell him to build a 350) that have that sort of opinion. i just wanted other people not just you , not that your opinion doesnt count or anything because it does, but i just wanted to hear some other opinions cuz i like to hear more than just 1. I hope there's no hard feelings or anything , thats the last thing we need on here is for members to be upset with 1 another.

thomas

 

i already built the 305 but from what you and some other members have told me that the heads i have dont like mods to them so im just trying to get a little more power out of what i already have. I have access to a full shop right here at my house with almost every tool you can imagine , than in the future Im planing on building ,as Ive said before a 355 with 400-450 hp .