305 rebuild parts question

[suzuki0702]

im rebuilding my 78 305. ive found this kit at a really good price and wondering what parts to i need to swap for marine use?

http://shop.enginekits.com/osb/itemdetails.cfm?ID=565

i can get brass freeze plugs at the same place for 9 bux! thanks fellas!

 

[Bt Doctur]

Re: 305 rebuild parts question

Should work ,but the cam should be for marine.Was wondering what size overbore your doing.The trouble with using an old block that was run in salt water is the amount of cast iron that has been removed from the cyl walls.To large an overbore and the cyl. walls get a bit thin for cooling purposes.

 

[suzuki0702]

Re: 305 rebuild parts question

this was a freshwater deal the whole life. my dad says i might be able to get away with just a hone. but if not going .020 over. where can i locate one of those marine cams?

 

[Bt Doctur]

Re: 305 rebuild parts question

Some say the RV/Truck cam is very close to the marine version

 

[suzuki0702]

Re: 305 rebuild parts question

well i see summit racing has an xtreme performance camshaft for marine use for 125? or the engine kit place has that rv cam for 30 extra.. decisions decisions!

 

[180shabah]

Re: 305 rebuild parts question

Don't get hung up on the marine cam, you just need one that makes it's power from idle to 5k and has a LSA (Lobe Seperation Angle) of 109-112*

Give them a call before you order, the kit cam may be fine, I also noticed that they have an RV cam as a $30 upgrade. Get the specs on both cams.

Also, find out what the head gasket is made of.

 

[suzuki0702]

Re: 305 rebuild parts question

Don't get hung up on the marine cam, you just need one that makes it's power from idle to 5k and has a LSA (Lobe Seperation Angle) of 109-112*

Give them a call before you order, the kit cam may be fine, I also noticed that they have an RV cam as a $30 upgrade. Get the specs on both cams.

Also, find out what the head gasket is made of.

what should it be made out of? 109-112 degrees huh? those are the only two parts i need to swith off... camshaft and freeze plugs right? is the camshaft swapped because its made for a consistent throttle instead of various engine speeds.? youve been a big help bud i cant thank you enough!

 

[180shabah]

Re: 305 rebuild parts question

Head gasket - should not be copper or steel. Of course I am assuming that this is a raw water cooled engine. If it is fresh water cooled, then this is really a non-issue.

camshaft - idle - 5000RPM, you will spend a good deal of time idleing, so a strong idle is important, anything over 5k, will destroy your drive rapidly and comes at the expense of power down low(this what gets you on plane). Wrong LSA creates reversion. Your engine will actually suck the water from the exhaust back into the cylinders. Constant RPM vs Changine RPM makes no difference.

 

[suzuki0702]

Re: 305 rebuild parts question

i think ill hold out for that sierra camshaft here on iboats $200 well spent id say!

 

[Buttanic]

Re: 305 rebuild parts question

Go to any auto parts store and get a cam for a Chevy C30 truck. Pretty much a duplicate of the Merc cam.