HEY GRUMPYVETTE?
"I am looking to purchase a New Bowtie shortblock for my 79 malibu and I can't decide on which one. They all have a 4.00" Stroke x 6.00" Rod. The 427 has 4.125" Bore, 434 has 4.155" Bore (which is .30 over) and the 440 has 4.185" Bore (which is .40 over). I am looking at the flat top piston with 2 valve relief which will net me around 12.4:1 compression with 64cc heads. I am not sure on the thickness of the head gasket I should go with yet. The heads will have 225cc Intake runners, angle plugs and 64cc combustion chambers. I am looking for a hydraulic roller cam that has .600 lift, 314 duration, 252 Duration @ .050" Lift, 110 lobe seperation and 106 at intake centerline (I can't find a bigger one for the hydraulic roller) and 1.50 roller rockers( I could get 1.6 rockers to get more lift). Would I really benefit any by stepping up to the 440 vs the other 2 other than cubic inches? I will be running 1 3/4" tubed header with 3 1/2" collectors, a Proform 850 race carb, TH350 which stalled around 4k behind my 355, and a 9" with 4.57 spooled center section. I haven't decided on intake yet but I am thinking about the Wiend Team G single plane.
Thanks for any help in advance,
I already have the lifters from my 355 so I thought I could save some money. I could switch to a mechanical roller setup but would like to keep my stall converter if possible. It should stall closer to 5K rpm behind the new motor. Any suggestions on which cam and lifters to use?
How does this one sound? It requires 11.5:1 compression and 5k stall.
Cam Style: Mechanical roller tappet
Basic Operating RPM Range: 4,500-7,500
Intake Duration at 050 inch Lift: 276
Exhaust Duration at 050 inch Lift: 284
Duration at 050 inch Lift: 276 int./284 exh.
Advertised Intake Duration: 313
Advertised Exhaust Duration: 322
Advertised Duration: 313 int./322 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.660 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.630 in.
Valve Lift with Factory Rocker Arm Ratio: 0.660 int./0.630 exh. lift
Lobe Separation (degrees): 106 "
BITS OF ADVICE leave some bore wall for future rebuilds and refreshing the rings ETC.
a couple cubic inches won,t be critical to success in a street strip combo,
a hydraulic roller will be ok, BUT a solid roller will be much better, if its limited in mileage due to less tendency to get into valve float issues AND don,t look to exceed about 6700rpm simply because with a 4" stroke your piston speeds start to get critical at about 6600-6700rpm , and unless your running a 18 degree head design vs the large port 23 degree heads your well past the point you can fill the cylinders efficiently at 6500rpm, plus there are very few 23 degree 225cc heads that will feed a 434-440 sbc up past about 6500rpm nearly as well as a 18 degree head
http://www.brodix.com/heads/-18xdyno.html
http://awesomeengines.biz/brodix-18%C2% ... ies-heads/
http://www.brodix.com/heads/-18x.html
http://www.trickflow.com/egnsearch.asp? ... toview=sku
Trick Flow® Ultra 18® Race Cylinder Heads for Small Block Chevrolet
Take the 18 degree power leap.
Trick Flow® Ultra 18® Race cylinder heads can make serious horsepower--power ideal for high-rpm Circle Track or Super Class drag racing. Dyno testing proves it--a 406 cu. in., 12:1 compression small block with out-of-the-box Ultra 18® Race heads produced 730 peak horsepower at 7,500 rpm and 545 ft.-lbs. of peak torque at 6,000 rpm. The heads deliver high airflow numbers--334 cfm intake/246 cfm exhaust--right out of the box. They feature 56cc CNC-profiled combustion
chambers, 250cc raised intake and 100cc exhaust runners, ductile iron intake and hard bronze exhaust valve seats, and manganese bronze valve guides. The bare castings are machined for 2.150 in./1.600 in. valves (and can accept valves up to 2.200 in./1.625 in.) and 1.640 in. valve springs. Assembled heads are also available, featuring 2.150 in./1.600 in. stainless steel valves, 1.550 in. dual valve springs, and 10 degree retainers and locks. Trick Flow® Ultra 18® Race heads accept most current 18 degree intake manifolds (including 2-piece manifolds), headers, and other components. They require the use of offset shaft mount rocker arms and a mechanical roller camshaft with offset intake lifters
"I am looking to purchase a New Bowtie shortblock for my 79 malibu and I can't decide on which one. They all have a 4.00" Stroke x 6.00" Rod. The 427 has 4.125" Bore, 434 has 4.155" Bore (which is .30 over) and the 440 has 4.185" Bore (which is .40 over). I am looking at the flat top piston with 2 valve relief which will net me around 12.4:1 compression with 64cc heads. I am not sure on the thickness of the head gasket I should go with yet. The heads will have 225cc Intake runners, angle plugs and 64cc combustion chambers. I am looking for a hydraulic roller cam that has .600 lift, 314 duration, 252 Duration @ .050" Lift, 110 lobe seperation and 106 at intake centerline (I can't find a bigger one for the hydraulic roller) and 1.50 roller rockers( I could get 1.6 rockers to get more lift). Would I really benefit any by stepping up to the 440 vs the other 2 other than cubic inches? I will be running 1 3/4" tubed header with 3 1/2" collectors, a Proform 850 race carb, TH350 which stalled around 4k behind my 355, and a 9" with 4.57 spooled center section. I haven't decided on intake yet but I am thinking about the Wiend Team G single plane.
Thanks for any help in advance,
I already have the lifters from my 355 so I thought I could save some money. I could switch to a mechanical roller setup but would like to keep my stall converter if possible. It should stall closer to 5K rpm behind the new motor. Any suggestions on which cam and lifters to use?
How does this one sound? It requires 11.5:1 compression and 5k stall.
Cam Style: Mechanical roller tappet
Basic Operating RPM Range: 4,500-7,500
Intake Duration at 050 inch Lift: 276
Exhaust Duration at 050 inch Lift: 284
Duration at 050 inch Lift: 276 int./284 exh.
Advertised Intake Duration: 313
Advertised Exhaust Duration: 322
Advertised Duration: 313 int./322 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.660 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.630 in.
Valve Lift with Factory Rocker Arm Ratio: 0.660 int./0.630 exh. lift
Lobe Separation (degrees): 106 "
BITS OF ADVICE leave some bore wall for future rebuilds and refreshing the rings ETC.
a couple cubic inches won,t be critical to success in a street strip combo,
a hydraulic roller will be ok, BUT a solid roller will be much better, if its limited in mileage due to less tendency to get into valve float issues AND don,t look to exceed about 6700rpm simply because with a 4" stroke your piston speeds start to get critical at about 6600-6700rpm , and unless your running a 18 degree head design vs the large port 23 degree heads your well past the point you can fill the cylinders efficiently at 6500rpm, plus there are very few 23 degree 225cc heads that will feed a 434-440 sbc up past about 6500rpm nearly as well as a 18 degree head
http://www.brodix.com/heads/-18xdyno.html
http://awesomeengines.biz/brodix-18%C2% ... ies-heads/
http://www.brodix.com/heads/-18x.html
http://www.trickflow.com/egnsearch.asp? ... toview=sku
Trick Flow® Ultra 18® Race Cylinder Heads for Small Block Chevrolet
Take the 18 degree power leap.
Trick Flow® Ultra 18® Race cylinder heads can make serious horsepower--power ideal for high-rpm Circle Track or Super Class drag racing. Dyno testing proves it--a 406 cu. in., 12:1 compression small block with out-of-the-box Ultra 18® Race heads produced 730 peak horsepower at 7,500 rpm and 545 ft.-lbs. of peak torque at 6,000 rpm. The heads deliver high airflow numbers--334 cfm intake/246 cfm exhaust--right out of the box. They feature 56cc CNC-profiled combustion
chambers, 250cc raised intake and 100cc exhaust runners, ductile iron intake and hard bronze exhaust valve seats, and manganese bronze valve guides. The bare castings are machined for 2.150 in./1.600 in. valves (and can accept valves up to 2.200 in./1.625 in.) and 1.640 in. valve springs. Assembled heads are also available, featuring 2.150 in./1.600 in. stainless steel valves, 1.550 in. dual valve springs, and 10 degree retainers and locks. Trick Flow® Ultra 18® Race heads accept most current 18 degree intake manifolds (including 2-piece manifolds), headers, and other components. They require the use of offset shaft mount rocker arms and a mechanical roller camshaft with offset intake lifters