THis kind of goes back to my question of whether or not the LO3 is worth keeping, but i wanted ot know if it is possible to get the LO3 in the 13's at all, without any nitrous. I have a stripped down 90' Formula 5-Speed (no spare or rear seats).
I just want to know, even if it means lots of work...if i can keep the stock block and manage 13's. It seems that everybody is saying the heads on the LO3 are the weakest part, but even with higher flowing heads, they still don't seem that hot. Why are these engines so restrictive? Any help on the subject would be wonderful.

 

Last time this type of subject was posted it turned into a pissing contest. The truth is yes, it can make it into the 13's, any small block chevy with some work will hit a 13 second pass. The heads arent that great and it would probably be better to go with S/R Torquers, Vette L98 or Vortecs. The biggest increase you will see is changing the cam.

 

im hoping for the high 13's with my combo when i get done.. check out the site in my signiture for all the mods.

 

changed my mind heres the mods..




91 camaro RS
- 305 TBI
Mods: Performer TBI intake,lt1 cam , ported 305 tpi heads with k-motion valve springs and 1.5 comp cams roller rockers, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP 2400 tq converter, b+m trans cooler, white guage faces, megashifter,malloy billit pedals,taillight blackouts, centerline 16x8 rims, spohn lcas + panhard rod,lca relocation brackets,ls1 driveshaft, gm posi with richmond 3.23 gears.. it will be all done soon..

 

I have heard that the TBI intake doesnt exactly help up top, but I cannot confirm that, so...
Might wanna go with a LT4 HOT cam or comprable, and throw some either Vortec L31's milled to 56cc chambers, or thw World S/R's for the 305 on there, with some porting etc...
I see ya got yer suspension mods covered, but hows the wieght transfer? Also, might wanna think about running drag radials...
Obviously, try to trim off any weight ya can. I dont see sub frame connectors, those shoudl stiffen the chassis, and that is awlays good for longjevity.
What type of induction system ya running? open air/cowl or OEM style snorkel. if the later, find/buy/make a dual set up, otherwise, make sure ya got a cowl intuction hood, maybe isolate the air cleaner from engine bay... hot air sucks...
The only other thing I could think of off the top of my head would be steeper gears, and if this is just a strip car (which I doubt, b/c ya wanna keep L03), maybe set up true duals?
Just some thoughts...Take em with a grain of salt. :lala:

BTW, as a fellow L03'r, May I wish you the best of luck on your quest for a fas L03!

 

Thanks for all the help. I was also wondering...if i were to build up the LO3 block w/ goodies, would the quarter mile times benefit from cutouts behind the headers for straight through action...or should it be left throught the catback?

 

Y'know - since theres so many pro-305 guys out there - i was thinking one day...

The LS-1 in the new camaros has a real odd bore/stroke combo and i was trying to figure to myself whether its any similar to a 305s setup. If theres any truth in that - I have some theories about a 305...

This is all of course - assuming that one could take advantage of a bullit bottom end. Balanced / Forged Pistons / ARP Studs - Rod Bolts

1) I'd start by boring the motor out by .040. This would increase it somewhat significantly and unshroud the valves a little. That's the first big step.

2) Toss the heads in favor of a 1.94/1.60 setup. A late-model set of Chevy truck heads could be a good donor set. Port / Polish / use stainless-polished valves with light-weight retainers. The biggest flaw of the 305 is that it cannot breathe at all. Opening the bore and heads will probably yield a big increase in power.

3) As far as cam/valve train, I'd go with a 220/224 duration (or higher) cam (maybe an LT4 or something close) and hardened push-rods, guide plates, and rocker studs. If I had the money i'd go for roller-rockers too.

4) Top it all off with a Holley 2-bbl TBI intake

Far as i can tell - a stock bottom end with forged pistons will take a lotta abuse (6,000 rpm and nitrous or possibly a supercharger - 350 heads would increase the compression and give a good start for some forced-air!) and the light-weight valve-train could take advantage of the ability the motor could earn to spin up nicely. Give me some input on this fellas - i'm curious if a 305 could be a contender w/o going to any lengths that wouldn't be put into a 350. There's gotta be SOMETHING to take advantage of (?). I've got 2 305s sitting around that I want to do something with!!

TP

 

The LS-1 in the new camaros has a real odd bore/stroke combo and i was trying to figure to myself whether its any similar to a 305s setup. If theres any truth in that - I have some theories about a 305...

You sure a LS1 has a wierd stroke? isnt it a 350?



Far as i can tell - a stock bottom end with forged pistons will take a lotta abuse (6,000 rpm and nitrous or possibly a supercharger - 350 heads would increase the compression and give a good start for some forced-air!) and the light-weight valve-train could take advantage of the ability the motor could earn to spin up nicely. Give me some input on this fellas - i'm curious if a 305 could be a contender w/o going to any lengths that wouldn't be put into a 350. There's gotta be SOMETHING to take advantage of (?). I've got 2 305s sitting around that I want to do something with!!

how do you figure 350 heads will increase impression? 350 heads will decrease the compression...305 heads are 58cc and 350 heads are usually around 64cc

 

you really don't need al that much to make a 305 run a number. you really need very little power to make a car run in the 13's. it is more a matter of the use of the power than anything.
to get into the 13's you really only need to go about 97mph. thta represents about 12-13 more than stock. considering you can make up 3-4mph with just a full exhaust and ultimate tbi mods you are only really looking for 8-9mph, which is about 50-60 rear wheel horses.
figure a performer TBI is worth another 10-15rwhp, that leaves 40-45 you are looking for.
i woudl say at that point you can put the $25 LT1 cam in and get another 20-25 of what you need.
then a custom chip will take care of the rest of the power you need.
that doesn't sound too tough does it? but like i said, it is the application of the power that you need to put your effort into. soem 3.73's or even better 4.10 gears, boxed/tubular control arms, control arm relo brackets, dropped front sway bar, batt relo to spare tire well, a 4-cyl S-10 torque convertor(or anything that will stall in the 2600-3000 range), and maybe soem good tires shoudl be enough to get you well into the 13's with a very drivable 305.

later
tim

 

Compared to a real 350 the LS1 has a smaller bore and a longer stroke, a L98-LT1 350 has a 4.00" bore and a 3.484" stroke and a LS1 has a 3.898" bore and a 3.622" stroke that actually computes out to be 346 cubic inches.

 

My bad about the compression - 350 heads would lower it by a lot, which was why i said that about the supercharger.

TP

 

id kinda like to try to get my 305 into the 12s but itll take some $$ im going to go ahead and get LCA, SFC, new struts, shocks springs, at least 16x8 rims and a 3.45 or 3.73 posi rear and then start worrying about engine mods...id say with all that a TBI edelbrock manifold, 305 torquer heads, and a lt1 cam i should be pretty quick and then with n2o it should definetly hit 12s and if it doesnt thats just sad

 

I have heard bad things about the edelbrock huring top end, I dunno if any of them are true or not, if anyone can say anything from experience, that would be great!

 

i never had any power loss at any rpm with mine, then again i was on a stock cam still. but i know it was still pulling pretty good when i woudl shift at 5000.

later
tim

 

njspeeder what yr s10 stall converters???? has to be the 4 banger? looking into checking htis out and claling up some junk yards now..that much higher of a stall would be very fun to play with...

 

OK, I guess the bad top end was just a rumor....