so you want a high rpm screamer, thinking about building,a 302 like the old Z28 engines?
well technology has advanced and theres better current options if your really interested
heres a mid priced effective combo
Ok time to get back to reality!
if your serious about building a high rpm screaming sbc I can,t think of anything Ive built or seen built that sounds better or pulls harder than a PROPERLY BUILT 377 , thats a 400 block with a 350 crank, it will spin at 7000rpm quite happily with a decent solid lifter valve train and the extra cubes more than compensates for the slight rpm advantage of the smaller 302.
obviously theres more expensive parts that could be used and those might increase the power some,or you could decrease the compression ratio down to about 10.5:1 to run on pump gas at the cost of some torque, but heres a decent combo
a properly assembled 377 will easily exceed 500 flywheel hp and have noticeably more torque than a similarly built 302, and before you ask it should be rather obvious that the engine built like that requires a proper quench and some bowl & chamber work and un-shrouded valves
and its very unlikey to run on high test without some octane booster
http://www.enginebuildermag.com/Article ... itch_.aspx
youll want a manual transmission and a 4.11-4.56 rear gear
heres a combo thats KNOWN to work
carb
http://www.summitracing.com/parts/HLY-0-4781C/
intake
http://www.summitracing.com/parts/HLY-300-110/
heads
http://www.summitracing.com/parts/BRO-1021001/
block
http://www.summitracing.com/search/?key ... 1211&dds=1
cam
http://www.crower.com/misc/cam_spec/cam ... 1&x=49&y=8
pistons
http://www.kb-silvolite.com/test/icon/i ... s&P_id=332
rods
http://www.summitracing.com/parts/SCA-26000716/
crank
http://www.summitracing.com/parts/SCA-435010/
long tube 1 3/4" tube headers that fit your application
a decent 7-8 qt baffled oil pan, that fits your application
http://www.moroso.com/catalog/categoryd ... code=11929
LINKS WELL WORTH THE EFFORT TO READ THRU
viewtopic.php?f=55&t=613&p=1379&hilit=+booster#p1379
viewtopic.php?f=53&t=726&p=5640&hilit=quench#p5640
viewtopic.php?f=52&t=727&p=6657&hilit=dynamic#p6657
viewtopic.php?f=52&t=2630&hilit=shrouding
viewtopic.php?f=54&t=2187
viewtopic.php?f=52&t=181
http://www.youtube.com/watch?v=i_NpzU4p ... re=related
you might want to watch these strobe light pictures of valves at higher rpms
obviously getting the clearances wrong, or over reveing the engine can cause problems
some options
ID usually suggest a shaft rocker system be installed on a valve train that was expected to exceed 7000rpm but to keep costs semi reasonable,a flat tappet solid lift engine cam like this, for your sbc thats designed to run up in the 7000rpm plus range
http://www.cranecams.com/?show=browseParts&lvl=2&prt=5&Vehicle_Type=Auto&Cylinders=8&Engine_Make=CHEVROLET&Year=1982&Engine_Size=262-400 C.I.&partNumber=111411&partType=camshaft
http://www.cranecams.com/?show=browseParts&lvl=3&prt=122&action=partSpec&partNumber=99846-16
spring Requirements: Triple Dual Outer Inner
Part Number 96877
Loads Closed 126 LBS @ 1.850 or 1 27/32
Open 328 LBS @ 1.340
use 1.5 RATIO rockers,like these
erson 800-16
specs>> 1.5 3/8 $271.21
http://www.pbmperformance.com/store.php?catId=24
to reduce the effective ramp acceleration rate on the valve train
http://www.summitracing.com/parts/CCA-4013/?image=large
and a stud girdle on the rocker studs, seems to be indicated
http://store.summitracing.com/partdetail.asp?part=TFS-30400700&autoview=sku
http://store.summitracing.com/partdetail.asp?part=TFS-30400701&autoview=sku
its very common to find you'll gain a couple horsepower with the addition of a rocker stud girdle employed,
as youll have both more precise valve train control and less deflection, Ive seen guys instantly gain an extra 150 rpm-200 rpm,
before they started feeling valve float or loss of valve train control and its certainly less stress on the cylinder head casting and rocker studs.
the one thing ID suggest is that before you buy any rocker stud girdle you ask questions, many cylinder head designs use non-standard rocker stud spacing.
its not horsepower, its the stress on the valve train, that makes a rocker stud girdle and its increased rigidity useful,
and this intake so you won,t restrict flow rates
http://www.summitracing.com/parts/HLY-300-110/
decent low cost cast valve covers to clear the stud girdle
http://www.summitracing.com/parts/TFS-31511802S/
well technology has advanced and theres better current options if your really interested
heres a mid priced effective combo
Ok time to get back to reality!
if your serious about building a high rpm screaming sbc I can,t think of anything Ive built or seen built that sounds better or pulls harder than a PROPERLY BUILT 377 , thats a 400 block with a 350 crank, it will spin at 7000rpm quite happily with a decent solid lifter valve train and the extra cubes more than compensates for the slight rpm advantage of the smaller 302.
obviously theres more expensive parts that could be used and those might increase the power some,or you could decrease the compression ratio down to about 10.5:1 to run on pump gas at the cost of some torque, but heres a decent combo
a properly assembled 377 will easily exceed 500 flywheel hp and have noticeably more torque than a similarly built 302, and before you ask it should be rather obvious that the engine built like that requires a proper quench and some bowl & chamber work and un-shrouded valves
and its very unlikey to run on high test without some octane booster
youll want a manual transmission and a 4.11-4.56 rear gear
heres a combo thats KNOWN to work
carb
http://www.summitracing.com/parts/HLY-0-4781C/
intake
http://www.summitracing.com/parts/HLY-300-110/
heads
http://www.summitracing.com/parts/BRO-1021001/
block
http://www.summitracing.com/search/?key ... 1211&dds=1
cam
http://www.crower.com/misc/cam_spec/cam ... 1&x=49&y=8
pistons
http://www.kb-silvolite.com/test/icon/i ... s&P_id=332
rods
http://www.summitracing.com/parts/SCA-26000716/
crank
http://www.summitracing.com/parts/SCA-435010/
long tube 1 3/4" tube headers that fit your application
a decent 7-8 qt baffled oil pan, that fits your application
http://www.moroso.com/catalog/categoryd ... code=11929
LINKS WELL WORTH THE EFFORT TO READ THRU
viewtopic.php?f=55&t=613&p=1379&hilit=+booster#p1379
viewtopic.php?f=53&t=726&p=5640&hilit=quench#p5640
viewtopic.php?f=52&t=727&p=6657&hilit=dynamic#p6657
viewtopic.php?f=52&t=2630&hilit=shrouding
viewtopic.php?f=54&t=2187
viewtopic.php?f=52&t=181
http://www.youtube.com/watch?v=i_NpzU4p ... re=related
you might want to watch these strobe light pictures of valves at higher rpms
obviously getting the clearances wrong, or over reveing the engine can cause problems
some options
ID usually suggest a shaft rocker system be installed on a valve train that was expected to exceed 7000rpm but to keep costs semi reasonable,a flat tappet solid lift engine cam like this, for your sbc thats designed to run up in the 7000rpm plus range
http://www.cranecams.com/?show=browseParts&lvl=2&prt=5&Vehicle_Type=Auto&Cylinders=8&Engine_Make=CHEVROLET&Year=1982&Engine_Size=262-400 C.I.&partNumber=111411&partType=camshaft
http://www.cranecams.com/?show=browseParts&lvl=3&prt=122&action=partSpec&partNumber=99846-16
spring Requirements: Triple Dual Outer Inner
Part Number 96877
Loads Closed 126 LBS @ 1.850 or 1 27/32
Open 328 LBS @ 1.340
use 1.5 RATIO rockers,like these
erson 800-16
specs>> 1.5 3/8 $271.21
http://www.pbmperformance.com/store.php?catId=24
to reduce the effective ramp acceleration rate on the valve train
http://www.summitracing.com/parts/CCA-4013/?image=large
and a stud girdle on the rocker studs, seems to be indicated
http://store.summitracing.com/partdetail.asp?part=TFS-30400700&autoview=sku
http://store.summitracing.com/partdetail.asp?part=TFS-30400701&autoview=sku
its very common to find you'll gain a couple horsepower with the addition of a rocker stud girdle employed,
as youll have both more precise valve train control and less deflection, Ive seen guys instantly gain an extra 150 rpm-200 rpm,
before they started feeling valve float or loss of valve train control and its certainly less stress on the cylinder head casting and rocker studs.
the one thing ID suggest is that before you buy any rocker stud girdle you ask questions, many cylinder head designs use non-standard rocker stud spacing.
its not horsepower, its the stress on the valve train, that makes a rocker stud girdle and its increased rigidity useful,
and this intake so you won,t restrict flow rates
http://www.summitracing.com/parts/HLY-300-110/
decent low cost cast valve covers to clear the stud girdle
http://www.summitracing.com/parts/TFS-31511802S/
Last edited by a moderator: