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BTW, the harbor freight guns wear out fast. if you leave the tips in solvent, the inner tip will rust Here was my spray yesterday. with the sun/temp at 88, it was kicking quick.

its very common to have 2 or 3 props for a 4-cylinder powered boat mainly because you are limited on power.

no way to measure a cam shaft with a caliper while in the motor and be accurate.

would really help to know which one of the many duo prop drives since 1981 that you are working on

not uncommon. boat builders may have had inventory on motors

we are still waiting for pictures of the points ignition

Why not repair your hatch?

You cant take pistons from one block and put into another block and get good results

Link in my sig, first post has links to the cam I chosen 268 degrees of duration is the biggest cam you can use with wet exhaust. Before I spent any money, I would use a dial indicator and determine what you have. Your cam is probably fine However, with vortec heads most cams hotter than...

Backup drive is now taken apart, flushed, the lower sanded down and primed. The lower will be going back together this week, and if lucky, will get the upper on and that drive painted

Finally got around to painting the drive. The admiral put the boat on her honey-do list as she wants to go boating

If you are re-ringing, you need new pistons and a bore\hone. Mercruiser bought the same pistons used in trucks, and every other marine motor Your stock pistons are GM flat tops with 4 reliefs

I will add, if you are rebuilding a motor, now is the time to make it better than what GM sold Mercruiser

starts the same regardless of temperature from 90 all the way down to 45. first start is always, one full prime, then part throttle and turn the key. with two 30cc squirters, it fires off about the 4th or 5th revolution when cold, and about the 2nd revolution when warm

welcome aboard. remember, Mercruiser just buys a GM longblock. talk to your machine shop. make sure to hone to +.001 of a standard truck hone. ring gap is dependent on your piston type. cast, hyper, forged, etc.

you can use a dial indicator on the cam lobes and get total rise on the cam, then use your rocker arm ratio and calculate valve lift.

FWIW......I havent run a choke in 2 years.

i use the Harbor Freight "purple" gun often. just used it moments ago with my drive. (rustoleum, hardener and acetone to thin) turn your pressure up to 45psi. you need more air. what type of compressor do you have?

could be coming from anywhere. could be a bad transom, bad transom shield seal, bad bellows, bad exhaust y-pipe, leaking screw hole, leaking thru-hull fitting, etc. dry the bilge, get a flashlight and look

you are going to have to make a triangular shelf to mount the battery trays