Is there anything special about these blocks?And how big can you safely go biulding one?
x2The actual "marine" long block is identical to the passenger car blocks and heads. The only differences are that the engines slated for marine use are "marinized". Stainless waterpump impellers and pump backing plate. Brass core plugs. Stainless t-stats and SAE J1171, ignition proof electrics and fuel systems. The camshafts are also spec'd for RH or LH rotation and high RPM power bands..
Always sonic check a used marine engine block. The salt water corrosion,( from the cooling system), to the water jackets is nothing compared to the pollutants that are in the waterways, let alone the electrolosys from the poorly designed electrical systems that boats have. THEY ROT FROM THE INSIDE OUT QUICK. Ground paths and salt water DO NOT MIX.Thanks guys.Theres one here local for sale and the guy says it can go 540 inches.Just trying to research ot a little before we throw the dough out there.
JUMP ON IT DUDE! If it passes the test u've got a great foundation for your 540. 850hp on pump gas with no problems. I've got the same block in my 3500lb Chevelle.,runs 10.0'[email protected] shifting at 6400,4.30 rear gear on a 14.5x32 rear tire.this motor will never hurt itself running these rpm's! good luck!Thanks jshelton.Thats what I need to know.Is $350 aa good price for the block and it comes with the factory crank,rods,and pistons?
I also have a 454 marnine block in my garage with the factory forged crank, it is stamped with PASS iirc, but has a Mercruiser tag on the block. I believe the motor was the original in a 1988 or so Cobalt 24ft boat.They are ALL GM base engines, when it comes to the 454 or 502). I have 8or 9 in my shop right now and all of them are bow tie with exception of the earlier models that are typical stampings,(HI PERF, PASS etc). Who had there label on the one you saw, (Mercruiser, Volvo, etc.)? Just curious.
Buy the way the OP wants to know if he can use a marine block. Lets stay on target with the OP's question so as to not muddy up the thread.