Anyone Tried the ZZ 427/480HP Crate Mtr ??
Anyone tried this Crate Motor?
Thinking of installing this in a '71 LS-5 Vert. It has the Big Block Hood, but I feel certain it will be too short. I welcome feedback .... Thanks... http://www.jegs.com/i/Chevrolet-Perf...ductId=1123887 I contacted Jegs and verified it is a hotter version of the 427 crate motor. Specifications Engine Type: BB-Chevy V8 Displacement: 427 ci Bore x Stroke: 4.25" x 3.75" Block: Cast iron with 4-bolt main caps Crankshaft & Connecting Rods: Forged steel Pistons: Forged aluminum Camshaft: Hydraulic roller Valve Lift: .527 Intake/.544 Exhaust Camshaft Duration @ .050": 224° Intake/234° Exhaust Cylinder Heads: Aluminum oval port, 110cc chambers Valve Size: 2.19 Intake/1.88 Exhaust Compression Ratio: 10.1 to 1 Rocker Arms: Aluminum roller, 1.7 to 1 ratio Distributor: HEI Carburetor: 770 cfm Water Pump: Aluminum, short Spark Plugs & Wires: Included Flexplate: 14" Ignition Timing: Base 10° BTDC, Total 36° Maximum Recommended RPM: 6400 Balanced: Internally Recommended Fuel: 92 Octane |
No personal experience with that motor
But is is ironic that on Overhaulin' just last night, they put that exact motor in a 67 Camaro. Take it for what its worth. Sounded real nice, nice idle and hauled pretty fast on the test drive. If it was me I would go with a 454 or a 502. Keep us informed on what you decide. Pics also :thumbs: |
Originally Posted by bmans vette
(Post 1582142439)
No personal experience with that motor
But is is ironic that on Overhaulin' just last night, they put that exact motor in a 67 Camaro. Take it for what its worth. Sounded real nice, nice idle and hauled pretty fast on the test drive. If it was me I would go with a 454 or a 502. Keep us informed on what you decide. Pics also :thumbs: I was not impressed by the specs on teh ZZ454/440HP. Cam specs and compression left much on the table. The 427 has the same cam as the 502 without the inches to swallow the cam. (that is my current reasoning) It is hard to get past sticking a 427 in a 454 car.... :hide: |
Originally Posted by Sandrider
(Post 1582146493)
Thanks for Your reply. :cheers:
I was not impressed by the specs on teh ZZ454/440HP. Cam specs and compression left much on the table. The 427 has the same cam as the 502 without the inches to swallow the cam. (that is my current reasoning) It is hard to get past sticking a 427 in a 454 car.... :hide: But go with your gut. It is your car. No sense having any remorse later on. Pics when its done please............:cheers: |
Originally Posted by Sandrider
(Post 1582142218)
Anyone tried this Crate Motor?
Thinking of installing this in a '71 LS-5 Vert. It has the Big Block Hood, but I feel certain it will be too short. I welcome feedback .... Thanks... http://www.jegs.com/i/Chevrolet-Perf...ductId=1123887 I contacted Jegs and verified it is a hotter version of the 427 crate motor. Specifications Engine Type: BB-Chevy V8 Displacement: 427 ci Bore x Stroke: 4.25" x 3.75" Block: Cast iron with 4-bolt main caps Crankshaft & Connecting Rods: Forged steel Pistons: Forged aluminum Camshaft: Hydraulic roller Valve Lift: .527 Intake/.544 Exhaust Camshaft Duration @ .050": 224° Intake/234° Exhaust Cylinder Heads: Aluminum oval port, 110cc chambers Valve Size: 2.19 Intake/1.88 Exhaust Compression Ratio: 10.1 to 1 Rocker Arms: Aluminum roller, 1.7 to 1 ratio Distributor: HEI Carburetor: 770 cfm Water Pump: Aluminum, short Spark Plugs & Wires: Included Flexplate: 14" Ignition Timing: Base 10° BTDC, Total 36° Maximum Recommended RPM: 6400 Balanced: Internally Recommended Fuel: 92 Octane I have to believe you would be happy with that engine. |
Sounds like they just put together a reliable strong runner.
Higher powered BB versions out there by GM if you want them. Cant expect too much if theres a warranty on them Shoot some simple head work and a cam upgrade could really up the ante easily |
my old man put this engine in his 66 vette a couple of years ago. beside the oil burning issue it had the 427 makes good power and very streetable. He gets better gas milage then i do with the tremmec, 336 gears. gm did pay to rebuild this engine once,it took two years of bitching but they finaly agreed to foot the rebuild. it was burning a quart of oil every 100 miles. wheeler racing engines rebuilt the engine and thought the pistons where a little under sized and the combo of metric ring package was the problem. it got j/e pistons torque honed and put back together and dynoed at 488/480 if i remember right
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Interesting motor - looks reliable - which isn't a bad thing to some folks :D
were it me, I'd swap the rods for either I beam or H beam (preferable) rather than stock. However, with those small heads (flow), that should keep you from spinning it to the point where good rods are no longer optional. I'd question the fasteners... ARP is the de facto standard in motors with more than 300 hp the cam in that motor leaves a lot of the table, but I bet it's got tons of torque.... question is, in a Corvette, wouldn't you rather trade some of that torque for HP? what transmission are you running? All of the above is a wordy way of asking - what do you want your Corvette to do? cruise? track days? race? great mpg? dead nuts reliable? lighter? stronger? baddest sounding BBC on the planet (nothing, IMO, wrong with that at all) |
Get the zz454. Regrind the cam to .610/.630, 234/242 via Delta Cams for ~$100 and reinstall. Split the $2k you just saved with me for good advice and wave goodbye to the guy with this 427 in his car.
You'll have to elongate the slot in the rocker arms, but it's literally as simple as that to get the ZZ454 into the 520-ish hp range. I've done just that with three ZZ502's. The difference is night and day when you let a BBC engine actually breathe a little. With regards to hp loss, the 0.4 comp ratio difference equals about 5hp in this particular instance; but I'll take this 'loss' given the upside. |
Thanks for the continuted feedback..... :cheers:
My goal is a strong / reliable street motor, that on occasion, is good for a 3k road trip. Right now it has the factory M21 w/ 3.36 gears. This winter she will get an overdrive, but have yet to research that one. |
3 Attachment(s)
Here she is....
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