mach1

Hi, I'm planning to compression test the 351w in my 93 MasterCraft tomorrow and am looking for some guidance. Are these steps correct? 1) After engine is warm, remove all spark plugs 2) Disconnect coil wire from center of distributor cap and ground to engine block. (Is there a particular place on the block that I should be doing this?) 3) While in neutral, push the throttle handle all the way back so it is wide open (allowing unrestricted flow through carb). 4) Measure compression of each cylinder and compare. What kind of values should I expect during the compression test? I'm also planning to measure the oil pressure with a mechanical gauge. What should I expect for oil pressure. The boat has 1,150 hrs on it btw. Thanks in advance!

@oldjeep I believe the 4.8L came standard with a 4 speed (6 speed optional) and the 5.3 came standard with a 6-speed. I'll have to verify with the seller though.

Thanks again for all the advice! There are multiple places I can ski ranging between 10 to 50 miles away (so a worse case scenario would be 100 miles per weekend during a six month season). Luckily it's all relatively flat with not too many large hills. My biggest concern is probably the 4 speed trans. I'm worried about constantly feeling under powered or spinning a ton or rpms. I'm pretty sure it has a max torque of 305 ft-lb @ 4600 rpm. Does the 4.8 still stack up well with this kind of commute to the water?

@Craig thanks for the input! Does yours have the 4-speed transmission too?

Thanks for the input! It sounds like the the 4.8 will fit the bill. @oldjeep I agree that a four cylinder could pull it; however, that doesn't mean it should. I have to tow it the river every time I ski and would like at least some peace of mind on the road.

I currently own a 93 Prostar 190 and am looking for a tow vehicle. One of my options is 2012 GMC Sierra with the 4.8L V8 and 3.42 axle ratio. Do you guys think this will be up to the task or will I regret not getting something with more power. It is a standard cab/regular bed with 4x4 and according to the manual should have a 6,000 lb towing capacity. What do you guys think? Thanks in advance!