just hit continue at the top of each link for more useful info
Keep in mind even the factory 502 cubic inch big block used the stock L98 TPI throttle body size and made 500 horse power
yes a 58mm can potentially increase hp if your engines highly modified and your still using a stock 48mm throttle body, but its hardly a big restriction, and your probably going to gain more with other mods
http://www.wallaceracing.com/chokepoint.php
If you calculate the point where dual 48mm throttle bores become a significant restriction to flow on a 383 SBC
youll find you need to spin it to well over 10,000rpm
http://www.corvettemagazine.com/2000/ma ... /l98p1.asp
http://www.corvettemagazine.com/2000/ma ... l981p1.asp
http://www.corvettemagazine.com/2000/ma ... l982p1.asp
http://www.corvettemagazine.com/1999/se ... /l98p1.asp
http://www.corvettemagazine.com/2002/ap ... ance-1.asp
http://www.compcams.com/Community/Artic ... 1737510521
vaguely related builds
http://www.vetteweb.com/tech/vemp_0607_ ... index.html
http://www.superchevy.com/technical/eng ... index.html
http://airflowresearch.com/articles/article031/A-P1.htm
http://www.summitracing.com/parts/EDL-3817
swapping to VORTEC HEADS AND ADDING A 383 stroker kit can do wonders for your cars power curve
http://www.summitracing.com/search/Prod ... toview=SKU
http://www.summitracing.com/parts/SUM-151124/
summit sells a VORTEC TPI BASE, to convert your current TPI intake to the vortec HEADS
IF your goal is to have a significant increase in torque, to match the stock rear gearing, and keep the basic low rpm torque and response of the stock tpi and don,t mind the engine nosing over on power as it runs out of air flow at about 4700rpm
build the 383 add the vortec heads and a decent cam, like a crane 114132, keep the cpr down in the 9.0-9.4:1 range so you can run pump gas, get the quench in the .038-.044 range and enjoy smoking the tires
you'll have a very noticeable gain from the increased displacement and better head flow, and have a great combo for cruising and daily driving, far to many guys get fixated on the potential peak hp numbers , that the bigger heads, and larger cams can produce at the cost of lost low rpm power,rather than the much more useful low and mid rpm torque curve that makes the car fun to drive on the street
you could easily gain 70-80 hp OR MORE thru those mods (heads,intake,cam, stroker kit)
verify the quench and compression ratio, when you add the 383 kit, keeping in mind vortec heads have small combustion chambers that may require dished pistons and limited valve lift due to valve train clearances
http://www.summitracing.com/parts/CRN-114132/
(the crane 114132 cam should clear easily) and add the cam with new flat tappet lifters or if its a roller engine get a mild roller cam, swap to the vortec tpi intake base, the rest is fairly strait forward since you have a vortec engine your starting with, but keep in mind the damper and flywheel/flex plate balance used on the 383 must match the crank balance, so verify internal or external balance on the crank, and remember your current flex plate and harmonic balancer may not work on a 383 depending on your other component choices
hp is great for bragging but an instantly responsive engine with a great deal of low and mid range torque is a lot more fun on the street
Keep in mind even the factory 502 cubic inch big block used the stock L98 TPI throttle body size and made 500 horse power
yes a 58mm can potentially increase hp if your engines highly modified and your still using a stock 48mm throttle body, but its hardly a big restriction, and your probably going to gain more with other mods
http://www.wallaceracing.com/chokepoint.php
If you calculate the point where dual 48mm throttle bores become a significant restriction to flow on a 383 SBC
youll find you need to spin it to well over 10,000rpm
http://www.corvettemagazine.com/2000/ma ... /l98p1.asp
http://www.corvettemagazine.com/2000/ma ... l981p1.asp
http://www.corvettemagazine.com/2000/ma ... l982p1.asp
http://www.corvettemagazine.com/1999/se ... /l98p1.asp
http://www.corvettemagazine.com/2002/ap ... ance-1.asp
http://www.compcams.com/Community/Artic ... 1737510521
vaguely related builds
http://www.vetteweb.com/tech/vemp_0607_ ... index.html
http://www.superchevy.com/technical/eng ... index.html
http://airflowresearch.com/articles/article031/A-P1.htm
http://www.summitracing.com/parts/EDL-3817
swapping to VORTEC HEADS AND ADDING A 383 stroker kit can do wonders for your cars power curve
http://www.summitracing.com/search/Prod ... toview=SKU
http://www.summitracing.com/parts/SUM-151124/
summit sells a VORTEC TPI BASE, to convert your current TPI intake to the vortec HEADS
IF your goal is to have a significant increase in torque, to match the stock rear gearing, and keep the basic low rpm torque and response of the stock tpi and don,t mind the engine nosing over on power as it runs out of air flow at about 4700rpm
build the 383 add the vortec heads and a decent cam, like a crane 114132, keep the cpr down in the 9.0-9.4:1 range so you can run pump gas, get the quench in the .038-.044 range and enjoy smoking the tires
you'll have a very noticeable gain from the increased displacement and better head flow, and have a great combo for cruising and daily driving, far to many guys get fixated on the potential peak hp numbers , that the bigger heads, and larger cams can produce at the cost of lost low rpm power,rather than the much more useful low and mid rpm torque curve that makes the car fun to drive on the street
you could easily gain 70-80 hp OR MORE thru those mods (heads,intake,cam, stroker kit)
verify the quench and compression ratio, when you add the 383 kit, keeping in mind vortec heads have small combustion chambers that may require dished pistons and limited valve lift due to valve train clearances
http://www.summitracing.com/parts/CRN-114132/
(the crane 114132 cam should clear easily) and add the cam with new flat tappet lifters or if its a roller engine get a mild roller cam, swap to the vortec tpi intake base, the rest is fairly strait forward since you have a vortec engine your starting with, but keep in mind the damper and flywheel/flex plate balance used on the 383 must match the crank balance, so verify internal or external balance on the crank, and remember your current flex plate and harmonic balancer may not work on a 383 depending on your other component choices
hp is great for bragging but an instantly responsive engine with a great deal of low and mid range torque is a lot more fun on the street