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454 to 496 upgrades
Hey all, in the process of stroking my 454 I'm going to paste my engine builders quote below....& my question is (iwaiting to hear back from him as well) if its not a marine block, is it a simple change over to suit?
"FYI i may very well end up aquiring a factory roller 4 blt. 454 block. we could upgrade from your block to the newer style block taking advantage of roller cam, better oiling system, one piece rear main seal. i'm to find out today. i'll get the cost of iron oval port heads too. we need to make our decision which route were going to take. i'm hope we can do the 496 roller block and dart oval port heads." Thanks guys Pat |
I have built several and they perform great with the correct parts. There is no such thing as a marine block. You can use retro link lifters with a roller cam and they work as well as a GEN 6 block.
Don't buy any junk cheap parts and you will be fine. Contact RMBUILDER Bob Mandra to custom grind a cam. Its worth ever penny, and not much more than a off the shelf cam. He can also set you up with a good set of heads. Do not forget exhaust, all performance builds start there. |
Where is what I did to a Mark IV this past spring.
*1987, MIE/340 (7.4) 454 4 bolt main Big Block Dip it and hone the decks and cylinders cut .060 over Block was detailed with all casting debris removed Scat 9000 Crank 4.25, 496 stroker Scat 26385P - 6.385 in. Connecting Rods - Bushed -I Beam Forged 4340 steel Howards Cams 120255 - Max Torque Retrofit Hydraulic Roller Camshafts, Hydraulic Roller Tappet, Advertised Duration 288/294, Lift .585/.610, 112 L/S Howards Matching Valve Springs 98636 - 130# / 330# Cloyes Gear 9-203 - Cloyes Wear Plate, 031 in. Thick, Maxspeeding Hydraulic Retrofit Roller Lifters Probe 496 Dome Top +18.0cc - SRS Piston Set Clevite 77 Cam Bearings Federal-Mogal 4400 M20 Main Bearings King Engine Rod Bearings CR849HP Cloyes true double roller timing chain Mahle - Plasma Moly Coated piston rings Melling 10778C (Anti-Cavitation) oil pump Melling HV oil pump shaft. New Harmonic Balancer Rotating Assembly Fully Balanced Comp Cams High-Tech pushrods #7954 Completely refreshed Chevy Heads 14096188 / 454 Open / 118cc / 3angle valve APR head bolt sets ARP 1.90 rocker studs Norris S/S 1.7 roller rockers Seal Power Gasket set EDELBROCK BBC R2 AIRGAP INTAKE Pro Comp 2752 Fuel Pump Pro Comp Ignition Pro Comp distributor Super Stock coil 8mm Accel Hi performance wires New single wire alternator Mini (gear reduction and fully marine) starter Edelbrock 800 carburetor 12" aluminum, oval air cleaner (with K&N filter) Brass freeze plugs Stainless steel bolt set 4” Stainless steel risers 496 MerCruiser exhaust manifolds with Tall Risers Sherwood motor mounted raw water pump |
Thanks fellas...
& screen name-what were the hp/tq #'s. Sounds like a nice build Cheers pat |
do you have to change balancer and flywheel to balance the added displacement?
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Originally Posted by paintman
(Post 3620055)
"FYI i may very well end up aquiring a factory roller 4 blt. 454 block. we could upgrade from your block to the newer style block taking advantage of roller cam, better oiling system, one piece rear main seal. i'm to find out today. i'll get the cost of iron oval port heads too. we need to make our decision which route were going to take. i'm hope we can do the 496 roller block and dart oval port heads."
Thanks guys Pat I can understand if you were just gonna upgrade the current rotating assembly, but at this point your pretty much going all new parts. |
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