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I'm currenty building a motor for my 1956 pontiac. the motor i currently have is a 1977 350 four bolt main. I'm currently running 372's for gears. i already have a cam with 284 duration with good midrange HP for it and performer intake. I'm looking to get a good mid-range HP out of it. It's my summer toy and is taken to the strip now and then. I've considered vortec and 305 heads... I'm trying to build this motor on a decent dudget. and is it true I cant run factory rockers with that cam?**)
Crane Camshaft Specification Card
Part Number: 110551
Grind Number: H-228/320-6
Engine Ident: 1957-1987 CHEVROLET V-8 262 THRU 400 CU.IN.
ROUGH IDLE, MODERATE PERFORMANCE USAGE,
GOOD MID-RANGE H.P., LIMITED OVAL TRACK
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VALVE SETTING: INTAKE .000 EXHAUST .000 ----> HOT
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LIFT: INTAKE @CAM 320 @VALVE 480 ROCKER ARM RATIO
EXHAUST @CAM 320 @VALVE 480 1.5
ALL LIFTS ARE BASED ON ZERO LASH AND THEORETICAL ROCKER ARM RATIOS
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CAM TIMING OPENS CLOSES ADV DURATION
@ .004 INTAKE 36 BTDC 68 ABDC 284 °
TAPPET LIFT EXHAUST 68 BBDC 36 ATDC 284 °
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SPRING REQUIREMENTS
TRIPLE DUAL OUTER INNER
PART NUMBER 99838
LOADS:
CLOSED 110 LBS @ 1.688 OR 1 11/16
OPEN 312 LBS @ 1.228
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RECOMMENDED RPM
RANGE WITH MATCHING COMPONENTS
MINIMUM RPM 2800
MAXIMUM RPM 6000
VALVE FLOAT 6500
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CAM TIMING OPENS CLOSES MAX LIFT DURATION
@ .050 INTAKE 12 BTDC 36 ABDC 102 °ATDC 228 °
TAPPET
LIFT EXHAUST 44 BBDC 4 ATDC 110 °BTDC 228 °
with that cam you should be making pretty decent power
with a good set of heads and comp ratio.It's gonna have a definate rough idle and your power accessories might not work that good. you said you have a aftermarket intake ,which you will need and also you should run headers and prob a aftermaket converter.My 327 idles at 800 rpm and it sounds like it gonna stall.
(very loopy)
good set of heads and comp ratio
[QUOTE]Originally posted by cool55belair
[B]your power accessories might not work that good.
What do you mean by power accessories???
Im running full length headers with 5 speed manual with 372 gears.. would it be worth rebuilding the origional heads for that motor there 74cc heads.....
is there any prep work that needs to be done to the vortec heads to make them work....
will stock pushrods be ok with that setup???
what kinda CFM should I be running.......