hi am new here so not sure if am posting this at the right place anyway lets start

last year in june i bought a camaro z28 1985 with the rpo b4z so iroc-z package

i now know that it has a LG4 305 (92000km) with a 700r4 transmision and now i want to upgrade this engine i did some search on the net and not mutch people like the 305 and always recommend to make a swap for a 350 am not a mecanic my dad is and he dosent want to make a swap but he's ready to play with the top end of the engine so i came out with a combo and am not sure if it ok so i wanted your opinion on that and i dont know what headers to use i need help on that so the combo is

holley 670cfm
Cast Iron Vortec Cylinder Heads
Hydraulic Flat Tappet Camshaft & Lifter Kit
Roller Timing Chain Sets
HEI Street Spark Distributor
8.0mm Pow'r Wires

so i dont know if this combo will work correctly and i dont know what headers will fit with those heads and the car if any one has idea's my ears are open thanks

 

Yeah, that'll work. Vortec heads work just fine on the smaller-bore 305 motors. Despite the fact they'll lower compression a smidge, they'll generally blow the older heads into the weeds everywhere in the RPM range, particularly up top.

All you need is a set of shortie headers and matching y-pipe. DO NOT buy a setup for an LG4- that'll net you a little pea-shooter 2-1/4" y-pipe (to match up with the stock LG4 converter, presumably). Get a setup for a same year L69 305 HO motor and it'll come with the larger 3" y-pipe. Exhaust to match from there back, obviously, so factor in the cost of a COMPLETE exhaust system from the headers to tailpipes.

I've used a few sets of Hooker shorties and their matching y-pipe over the years. Works fine on 305s and larger engines. Not the only good choice out there, though.

You realize this will all be emissions illegal, of course. So if you have to deal with emissions in your area, you might want to reconsider all this from the ground up.

 

yeah the emission law i dont know them perfectly here in canada but i will take my chance

but for the headers what do you think of those
headers
y pipe
the y pipe supose to go with the headers thats what it said in the discription and the cat back i think i will go with
cat-back

how's that?

 

ok i was gonna buy my cam but now am not sure do any one know if i put a comp cams extreme Energy XE262H Hydraulic Flat Tappet will i clear the valve i was hoping it will fit right there with no modification in a 305 lg4 it said the lift is 462/469

here the link to it http://www.jegs.com/i/COMP+Cams/249/SK12-238-2/10002/-1

 

You will be very close on your lift on that cam. Id drop back just a lil and not go over say .465 lift but you may be ok

 

Louis, I'd forget about the aggressive modern grinds if you're trying to live under the Vortec lift limits. You want something daily-drivable that's got mellower lobes. Check out the Summit house brand K1102 cam. It's similar to the factory L69HO cam, but on a slightly narrower LSA. I have found it runs about equivalently, maybe a smidge stronger than the factory L69 cam. And it'll easily work with stock Vortec lift limits. You can still run it with factory Vortec springs, too, as long as you don't plan on revving over ~5500 RPMs.

Sometimes the most modern and aggressive designs are not the best path forward. Older lobe designs may leave a small handfull of HP on the table compared to newer ones, but they don't beat up the valvetrain and they last a LONG LONG time in a mildly warmed-up daily driver.

Oh, and the price is right: $100 including new lifters. I've used at least half a dozen Summit house brand cams over the years and never a single issue or failure (I have one in my mild 383 blower motor right now). They're older lobe design technology, but they're still quality parts. Link:

http://www.summitracing.com/parts/sum-k1102

 

Amen to that. Unless you're chasing some kind of class record, that's the way to go for a frequent driver. Cheap and reliable!

 

cool thanks!! and your sure about those heads even if am loosing compression it still good ? cause they are cheap and they come with the intake and all those gaskets but l heard world product 305 s/r torquer heads are good for this engine and they are 58 cc not 64cc like those vortec and all articles that i found says they all milled the vortec heads so am all confusing now... i dont want to milled those vortec heads am hoping for bolt on mods thats all

 

Yes, I'm sure. The slight loss of compression won't be missed when weighed against the much improved flow and combustion efficiency of the Vortec heads.

Stock LG4 heads are spec'ed at 58cc but many are more like 59-60, if you actually measure them. Vortec heads are spec'ed at 64cc but many who have actually taken the time to cc them (I have not personally) report they are actually around 62cc. So the difference is not even as big as the official numbers would suggest.

 

that sound nice with those vortec heads will my original valve cover fit on those if not what gasket and cover would you recommend? i dont care for crome it wont make me go faster