Keeping it stock...305 options

[Doober]

Heck TBI 4.3 v6s are rated at 160HP... no way a larger v8 should be rated at the same...

 

[79cuttycholo]

i didnt read all the posts in this topic but if u got a lg4 305 just buy headers put vortech heads on performer rpm intake holley 670 on it and a comp cam 262 ull be close to 350 horsepower then lock out ur timing to 34 degrees of advance at all times then ur cutty be a good performer

 

[megaladon6]

and if i remember the car craft? article correctly, the car wasn't streetable as the power came in very high. and i believe they upped the compression and had to modify the heads.

 

[79cuttycholo]

my bad i thought this was the olds forum lol meant to say monte

 

[othtim]

Heck TBI 4.3 v6s are rated at 160HP... no way a larger v8 should be rated at the same...

Sure, but TBIs didn't exist in 1980 in GM vehicles. Also, the torque numbers in the LG4s are much higher than the HP, like 100ft/lbs over the peak HP. They (LG4s) didn't rev very high, and they have a dual plane manifold which dies out at higher rpms.

Speaking of which does anyone know the factory shift point at WOT for an LG4?

 

[torjan]

......some bigger manifolds (62er corvette ramhorns, not installed atm, with a 2x2,5" exhaust)...........

option is history, the ram horns are not working cause of lack of space between, stockstarter/frame at the passenger side

next option is to try hooker 2050

 

[Doober]

......some bigger manifolds (62er corvette ramhorns, not installed atm, with a 2x2,5" exhaust)...........

option is history, the ram horns are not working cause of lack of space between, stockstarter/frame at the passenger side

next option is to try hooker 2050

Ok I'm confused here... what?

Heck TBI 4.3 v6s are rated at 160HP... no way a larger v8 should be rated at the same...

Sure, but TBIs didn't exist in 1980 in GM vehicles. Also, the torque numbers in the LG4s are much higher than the HP, like 100ft/lbs over the peak HP. They (LG4s) didn't rev very high, and they have a dual plane manifold which dies out at higher rpms.

Speaking of which does anyone know the factory shift point at WOT for an LG4?

WOT is probably around 4000-4500.

Torque numbers in TBI motors are also quite a bit higher than HP. Coincidentally the power level in said LG4 is maybe 10hp and 10lb.ft. more than a TBI 4.3... maybe 5% difference in performance for 16% in displacement? I'll take a stock TBI 4.3 over a stock LG4 any day. Not really worth going into this too much imo though since he bought a Vortec motor.

and if i remember the car craft? article correctly, the car wasn't streetable as the power came in very high. and i believe they upped the compression and had to modify the heads.

Are you talking about the one with Vortecs? The one I'm talking about was never put into a car, and it's very streetable, requiring no change to the heads (matching springs and screw-in studs would likely be ideal though). That 262 cam would be fine in a 305, but may be down a little on torque since it's a smaller displacement. After the car's warmed up I can let the clutch out almost at idle and not have any problems, power brakes still work like they should too. Just clearing the air on the Vortec/Comp thing 8)

 

[torjan]

......some bigger manifolds (62er corvette ramhorns, not installed atm, with a 2x2,5" exhaust)...........

option is history, the ram horns are not working cause of lack of space between, stockstarter/frame at the passenger side

next option is to try hooker 2050

Ok I'm confused here... what?

sry for that, after reading it again, i'm confused too

this mean i wanted to install vette ramhorns with a dual exhaust with 2,5" diameter
the project died, cause the place between starter and frame is to small to get to the manifold exit with 2,5"
the next thing i thought about is, to get some hooker headers http://www.holley.com/2050-1HKR.asp
to use it with the exhaust.

 

[anthonychacon80]

I dont know if you are still thinking about the 305, but I recently came across this article that proves you CAN get some impressive numbers out of a stock 305 bottom end by simply changing the heads, manifold and cam and getting at LEAST 1 hp/cu.

I dont think anyone else has posted it yet

http://www.popularhotrodding.com/en.../0667_phrs_305_chevy_engine_blocks/index.html

 

[Doober]

I actually came across an article somewhere a while back that running the same basic setup I have on a 305 made almost the same amount of power, but was down quite a bit on torque.

sry for that, after reading it again, i'm confused too

this mean i wanted to install vette ramhorns with a dual exhaust with 2,5" diameter
the project died, cause the place between starter and frame is to small to get to the manifold exit with 2,5"
the next thing i thought about is, to get some hooker headers http://www.holley.com/2050-1HKR.asp
to use it with the exhaust.

Ah I see. Are you wanting to run shorty headers? If not, a set of Hooker 2451s fit just fine on a G-Body. You need to remove the starter/oil filter, and install the driver's side header from under the car, but they slide right in without issue (passenger's side I put in this last time around without the A/C box, but I still don't think it would be a major issue with it in.)