below are the specs of the 383 long block i bought this summer i had an issure that looked to be a detnation problem on #8 this engine was ran at idle for about 30 minutes for cam beakin and timing total advance was set at 28degrees i was running 87 octain fuel. the machine shop i got this from jacked me around till now this started last june all they needed to do was send me a piston and rod to get me up and running agin and 2 valves. Long story short they never seen a pic of the damage and told me all my fault but we will send you the parts this had a 7 year unlimted hour warranty on it. they lost the piston in the mail few times and lots of other stories so i filed with BBB and now i get hung up on when i call they are in portland i am in alaska. So i take a piston and rod along with the damaged one down to my local machine shop and he tells me that the piston is closer to 9.8:1 c/r and i will need to mix in some race fuel to make it run right. what do you guys think will it run on pump gas as 87 is all i can get at the harbor here. oh yeah it went less than 2 minutes on the test run and it is a carbed motor with the carb rejetted for the 383. all of the other pistons are fine with no damage.
So now i have a 350 in the boat that i threw togeather out of spare parts new marine heads i had and used bottom end it has all the same stuff on it and no issues with it. the only things i did differnt was i had my heat exhanger cleaned and went with a electric fuel pump since the block i used did not have the opening for a engine pump.
Block GM 4-bolt 1 PC rear main seal
Crankshaft Scat steel 383 crankshaft
Connecting rods GM 3.750 w/ARP 150,000 bolts
Pistons Speed Pro Hypereutectic flat top 9:1 comp ratio
Piston rings Mahle plasma moly piston rings
Camshaft Comp marine .462/.477 - 218/224 - 112 specs
Lifters Speed Pro hydraulic
Oil pump Melling high volume oil pump
Timing set Cloyes HD double roller timing set
Bearings Clevite/Mahle HP "tri-metal" rod & main bearings
Harmonic balancer GM externally balanced
Freeze plugs Brass deep dish
Heads GM 76CC 1.60/2.02 cylinder heads
w/hardened valve guides, seats, guide plates & screw-in studs
Valves Stainless steel swirl polished 1.60 / 2.02
Springs Comp series valve springs .530 max lift
Push rods Elgin hardened push rods
Rockers GM 1.5 ratio rockers arms, balls & nuts
Gaskets Marine gasket set
Head bolts GM head bolts
Attached files [img]/media/kunena/attachments/vb/651149=24406-IMAG0252.jpg[/img]
So now i have a 350 in the boat that i threw togeather out of spare parts new marine heads i had and used bottom end it has all the same stuff on it and no issues with it. the only things i did differnt was i had my heat exhanger cleaned and went with a electric fuel pump since the block i used did not have the opening for a engine pump.
Block GM 4-bolt 1 PC rear main seal
Crankshaft Scat steel 383 crankshaft
Connecting rods GM 3.750 w/ARP 150,000 bolts
Pistons Speed Pro Hypereutectic flat top 9:1 comp ratio
Piston rings Mahle plasma moly piston rings
Camshaft Comp marine .462/.477 - 218/224 - 112 specs
Lifters Speed Pro hydraulic
Oil pump Melling high volume oil pump
Timing set Cloyes HD double roller timing set
Bearings Clevite/Mahle HP "tri-metal" rod & main bearings
Harmonic balancer GM externally balanced
Freeze plugs Brass deep dish
Heads GM 76CC 1.60/2.02 cylinder heads
w/hardened valve guides, seats, guide plates & screw-in studs
Valves Stainless steel swirl polished 1.60 / 2.02
Springs Comp series valve springs .530 max lift
Push rods Elgin hardened push rods
Rockers GM 1.5 ratio rockers arms, balls & nuts
Gaskets Marine gasket set
Head bolts GM head bolts
Attached files [img]/media/kunena/attachments/vb/651149=24406-IMAG0252.jpg[/img]
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