350 .06 over
-KB forged 13cc dished.
-9.8 compression
-5.7 forged scat rods
-scat cst crank
-trick flow 23 degree heads 64 CC
-40 head gasket
-lunati Voodoo SOLID ROLLER dur @.050 231/237 lift 555/566 LSA 110 Lash at .016
-1.5 roller rockers
-Cloyes dbl roller chain
-Victor JR. Intake
-speed demon 750 dp
-Headman Headers 1 5/8 3in collectors
-Mallory Unilite
w/ 3.89 tru track 9 inch moser 32 axles
w/ t.c.i. turbo 400
3200 converter
i have all but the heads and headers and converter....i just have mind made up on which one but i dont have the money yet...
any info and advice wud help.[/quote]
personally ID BET $10 that a properly tuned carb on a 350-383 sbc
http://store.summitracing.com/partdetai ... toview=sku
. intake would produce better average hp/torque and make the car marginally faster, its almost a given, that until your up into the mid 240 degrees on the cam, or above an auto transmission combo, the dual plane intake is the better choice, single plane intakes do have their place but its generally on combos that reach the 6700rpm-7500rpm and above range and seldom if ever drop below about 3500rpm during any acceleration power band
http://store.summitracing.com/partdetai ... toview=sku
if you use the same cam in a 383 as you used in the 350, youll find the engine runs a slight bit smoother and tends to pull slightly lower peak rpm numbers but generally it will have very similar characteristics
you'll generally find a slightly higher lift and slightly tighter LSA angle on a similar or slightly longer duration to be a better match if you want to get similar or slightly better hp/tq.
(keep in mind the extra displacement tends to boost the effective compression ratio with flat top pistons and that tends top increase the torque, but by adding a slight increase in duration and tightening up the LSA that tends to allow it to breath better)as the tighter LSA induces slightly more overlap and more effective dynamic cpr and the slight increase in duration tends to compensate the other way for the increased compression, in that it delays the valve closing, the net effect is increasing the duration and lift slightly but tightening the LSA allows the cylinders to fill slightly better at the slightly lower average rpm band.
I generally suggest tightening the lsa 2 degrees and adding 5-6 degrees more duration and as much extra lift as you can easily get, 1.6:1 roller rocker ratios help here, when upgrading from a 350 to a 383 with both having flat top pistons to compensate for the differences in the cpr, stroke etc.
-KB forged 13cc dished.
-9.8 compression
-5.7 forged scat rods
-scat cst crank
-trick flow 23 degree heads 64 CC
-40 head gasket
-lunati Voodoo SOLID ROLLER dur @.050 231/237 lift 555/566 LSA 110 Lash at .016
-1.5 roller rockers
-Cloyes dbl roller chain
-Victor JR. Intake
-speed demon 750 dp
-Headman Headers 1 5/8 3in collectors
-Mallory Unilite
w/ 3.89 tru track 9 inch moser 32 axles
w/ t.c.i. turbo 400
3200 converter
i have all but the heads and headers and converter....i just have mind made up on which one but i dont have the money yet...
any info and advice wud help.[/quote]
personally ID BET $10 that a properly tuned carb on a 350-383 sbc
http://store.summitracing.com/partdetai ... toview=sku
. intake would produce better average hp/torque and make the car marginally faster, its almost a given, that until your up into the mid 240 degrees on the cam, or above an auto transmission combo, the dual plane intake is the better choice, single plane intakes do have their place but its generally on combos that reach the 6700rpm-7500rpm and above range and seldom if ever drop below about 3500rpm during any acceleration power band
http://store.summitracing.com/partdetai ... toview=sku
if you use the same cam in a 383 as you used in the 350, youll find the engine runs a slight bit smoother and tends to pull slightly lower peak rpm numbers but generally it will have very similar characteristics
you'll generally find a slightly higher lift and slightly tighter LSA angle on a similar or slightly longer duration to be a better match if you want to get similar or slightly better hp/tq.
(keep in mind the extra displacement tends to boost the effective compression ratio with flat top pistons and that tends top increase the torque, but by adding a slight increase in duration and tightening up the LSA that tends to allow it to breath better)as the tighter LSA induces slightly more overlap and more effective dynamic cpr and the slight increase in duration tends to compensate the other way for the increased compression, in that it delays the valve closing, the net effect is increasing the duration and lift slightly but tightening the LSA allows the cylinders to fill slightly better at the slightly lower average rpm band.
I generally suggest tightening the lsa 2 degrees and adding 5-6 degrees more duration and as much extra lift as you can easily get, 1.6:1 roller rocker ratios help here, when upgrading from a 350 to a 383 with both having flat top pistons to compensate for the differences in the cpr, stroke etc.