originally posted else ware but interesting none the less
I see someone has already beat me to a cam selection question on the main board. I thought I'd bypass that and go straight to the source. I'm considering changing my cam over the winter to a Hyd Roller. I like the sound of the Comp Cams Thumper but I'm not sure that's the way to go for me. My 66 BelAir will be mostly used (99.9%) going to cruises and car shows. It has a M-20 Muncie, 3.73 rear gears and a 496 with headers. Right now I have a street Avenger Holley 870 but am considering other options. Can you recommend something?
Below are the current engine specs: (Yes they came from the builder )
• 557 hp @ 5500 RPM 632 ft. lbs torque 4500 RPM 496 CU IN CU IN
Machine Work
• Select Hi Tin block
• align bore and or check for run out.full race clearance
• Mag Check-pressure check
• Hot Tank - Jet Wash
• Bore Torque Plate Hone ... Torque Plate Gives True Finish
• Clearance block - -casting flash only n/c..
• Dynamic balance assembly..
• File fit rings - blue print clearance...
• Float - pistons to rods...
• Install cam bearings - freeze plugs...
• Port blue print cylinder heads..
• Final assemble full rotating and top end Parts including final torque - clearance - and geometry of all parts...
All new Performance Internal Parts
• new line JE/SRP FORGED pistons 10.5 to 1 piston set[PUMP GAS OK
• Eagle steel stroker crank all new 4.25 stroker .. torque at low rpm where you need it INTERNAL BALANCE
• Childs & Albert - zz gapdura Moly File Fit Rings... [provides the ultimate in ring sealing making more power!!
• Durabond - cam bearings...
• Eagle forged steel rods FLOATED
• ARP - wavelock - rod bolts...
• Clevite- -bearings tri metal 77 - rod and main...
• comp cams custom hi output cam lifter set ..
• Cloyes - true roller set...
• Comp - cams cam locks...
• comp cams xe chrome moly pushrods
• Dyna gear race - oil pump...
• Dyna gear - pickup...
• ARP - steel drive...
• After market - oil pan. baffeld 7 qt
• After market - timing cover...
• pioneer/arp - head bolts...
• ARP/ - rocker studs 7/16...
• Fel Pro blue - gasket sets...
Power Making Featured Parts
• ALL NEW PRO RECTANGLE PORT ALUMINUM LARGE OVERSIZE VALVES AND STAGE 1 PORTS REGARDED AS THE BEST POWER FOR STREET/STRIP LOOK AT THESE ADDED FEATURES. Bowls blended, ... 315 RUNNER VOLUME
o Features - - -severe duty STAINLESS 2.25/1.90 valves plus ... 1.50 springs 10 degree super locks comp cam parts..good porting..7/16studs guide plates.gasket match p.c seals.chrome moly retainers.. YOU NEED THIS SIZE VALVE TO MAKE THE POWER ALONG WITH THE CAM!!
• hi perfromance roller rockers-1.7 ratio...
• custom series- -muscle car cam RADICAL IDLE YET FAST THROTTLE RESPONSE HOW MANY ENGINES HAVE THAT !!.MAJOR LOW RPM TORQUE WITH EXTENDED RPM RANGE[] MATCHING POLISHED HI RISE INTAKE.
• Cam Features - 110 center line 578 - 578 lift corrected 1.7 ratio = 578/578 lift. 246/246 dur @ 050 awesome power range 2800 stall. lopey muscle car idle. 100% streetable and will run vacum access
• primary use hi performance pump gas street"
first question, why are you thinking of changing and whats your goals here,
youve obviously spent a good deal of time and cash on this car, if its just cruising and your current cam functions correctly why are you changing and spending more money
if I don,t know the goals its hard to match the results of a cam swap to the application and current parts
why do you want to change cams, what is the current cam choice doing you don,t like?
Hi Grumpy,
I'm just not happy with this cam. It just doesn't seem to be right for me. Most of my cruising is in the 1200-2200 range. This cam doesn't seem to work well below 2000.
It may very well be that I can't have this much head runner volume and a low end cam. I'm just not sophisticated enough to make that decision. If I do change I'd prefer to go to a roller setup. That may be just an opinion but nevertheless it is a choice I seem to be comfortable with.
Maybe going to 4.11s may be a better choice
I really only travel to one show that's 100 miles away. Most of the rest are in the 10-50 mile range.When I bought this engine I really thought I'd have more low end but it just doesn't feel like I do. For now I'm doing a lot of research and deciding what to do or even if I'm going to do anything.
You ask my goal? Well in a nutshell its this:
I want an engine that can cruise at low rpms and still sounds mean. (I know... everyone wants that)
Any considerations are welcome.
Thanks,