ENGINE SWAP 305 merc to 350 chev truck

KaGee

KaGee

Admiral
Joined
Aug 14, 2004
Messages
7,069
Re: ENGINE SWAP 305 merc to 350 chev truck

Originally posted by DHPMARINE:<br /> KaGee<br />I've heard this also about plug wires (snick)<br />can you help me out on this?<br /><br />i need to get on the water<br />Doug
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Sorry Doug.... see my sig... I'm just a backyard hacker! :p <br /><br />Have a great holiday!<br />Keith
 
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DAN0

Seaman Apprentice
Joined
Aug 30, 2004
Messages
32
Re: ENGINE SWAP 305 merc to 350 chev truck

Am I better off using the camshaft from my 305 mercruiser engine in my 350 truck engine? How do I identify the cam grind of my 350 cam and is ther somewhere IO can look to compare its specs to a marine cam?
 
M

MURX

Petty Officer 2nd Class
Joined
Oct 21, 2001
Messages
117
Re: ENGINE SWAP 305 merc to 350 chev truck

A truck grind is close if not identical to a marine grind. Will work just fine.<br /><br />Nice to see someone give advice worth it's cost
 
bomar76

bomar76

Lieutenant Commander
Joined
Jun 27, 2002
Messages
1,963
Re: ENGINE SWAP 305 merc to 350 chev truck

Originally posted by MURX:<br /> I love the Great Marine Cam Debate<br /><br />Can one of you "pros" please provide the<br />GM part numbers used in common early style marine smallblocks I don't care if it's a 305 or a 350 <br />marine engine. please list the part numbers and Camshafts specs <br /><br />BTW All Felpro SBC head gaskets are stainless steel layered construction
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Or you could just buy Dennis Moores book and read the specs yerself.......
 
M

MURX

Petty Officer 2nd Class
Joined
Oct 21, 2001
Messages
117
Re: ENGINE SWAP 305 merc to 350 chev truck

I quit :D
 
bomar76

bomar76

Lieutenant Commander
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Messages
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Re: ENGINE SWAP 305 merc to 350 chev truck

Well, the first edtion of Dennis's book was published in 2000.....so that kinda blows your story about reading it in 1973.
 
M

MURX

Petty Officer 2nd Class
Joined
Oct 21, 2001
Messages
117
Re: ENGINE SWAP 305 merc to 350 chev truck

see above
 
D

DAN0

Seaman Apprentice
Joined
Aug 30, 2004
Messages
32
Re: ENGINE SWAP 305 merc to 350 chev truck

By stainless head gaskets do you mean just the flame rings or the complete gaskets?
 
T

tryan

Seaman
Joined
May 29, 2004
Messages
59
Re: ENGINE SWAP 305 merc to 350 chev truck

buy felpro marine gaskets.<br /><br />these auto vs marine threads can get childish. make your own choice with the information that is available to you. <br /><br />30,40, 50 years ago, no there was not much difference. today is another story. <br /><br />the clevite web site will give you information on materials used in bearings exposed to a harsh marine enviroment. read it. marine part numbers here. chrome or ductile/moly rings? again you must decide.<br /><br />sure truck heads have valve springs designed to run at 4-5 grand all day long. NOT. Mr. Moore is a poster on another board and although i have not read his book ( i'm a ford guy ), he's seems to have knowledge based on experience.<br /><br />cam lift, duration and lobe seperation is a black art. sure you can stick a tight lobe center cam in, but water in cylinders threads suck also...........<br /><br /><br />bottom line. slap a 1200 motor in a run the **** out of it or spend a little more and have a motor that will last.
 
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Ralph 123

Captain
Joined
Jun 24, 2003
Messages
3,983
Re: ENGINE SWAP 305 merc to 350 chev truck

This is from Moore's book and may help:<br /><br />Chevy has used only 2 different camshafts in the marine small block over the years, a flat-based hydraulic lifter camshaft and a roller-based lifter camshaft starting in 1987.<br /><br />Flat-based hydraulic lifter marine camshaft used on the stock 305 and 350 marine engine<br /><br />Chevy part No. 340284<br />Duration<br />200 degrees intake duration @ 0.050" lift<br />258 degrees intake duration @ 0.006" lift<br />212 degrees exhaust duration @ 0.050" lift<br />270 degrees exhaust duration @ 0.006" lift<br /><br />Lift<br />0.400" intake valve lift with 1.50:1 rocker arms<br />0.266" intake lobe lift at the lifter<br />0.410" exhaust valve lift with 1.50:1 rocker arms<br />0.273" exhaust lobe lift at the lifter<br /><br />Timing<br />110 degrees intake to exhaust lobe centerline separation angle in camshaft degrees<br />108 degrees after top dead center intake lobe centerline position in crankshaft degrees<br />112 degrees before top dead center exhaust lobe centerline position in crankshaft degrees<br /><br />Duration of valve open time in crankshaft degrees<br />(table too big - buy the book)<br /><br /><br />Roller-based hydraulic lifter marine camshaft used on stock 305 and 350 marine engines<br /><br />Chevy part No. Not given...<br />Duration<br />197 degrees intake duration @ 0.050" lift<br />249 degrees intake duration @ 0.006" lift<br />258 degrees intake duration @ 0.004" lift<br />207 degrees exhaust duration @ 0.050" lift<br />264 degrees exhaust duration @ 0.006" lift<br />272 degrees exhaust duration @ 0.004" lift<br /><br />Lift<br />0.430" intake valve lift with 1.50:1 rocker arms<br />0.287" intake lobe lift at the lifter<br />0.450" exhaust valve lift with 1.50:1 rocker arms<br />0.300" exhaust lobe lift at the lifter<br /><br />Timing<br />109 degrees intake to exhaust lobe centerline separation angle in camshaft degrees<br />106 degrees after top dead center intake lobe centerline position in crankshaft degrees<br />112 degrees before top dead center exhaust lobe centerline position in crankshaft degrees<br /><br />Duration of valve open time in crankshaft degrees<br />(table too big - buy the book)
 
M

MURX

Petty Officer 2nd Class
Joined
Oct 21, 2001
Messages
117
Re: ENGINE SWAP 305 merc to 350 chev truck

these auto vs marine threads can get childish. make your own choice with the information that is available to you.<br /><br />I agree not only do they get childish but the information exchanged is borderline ludicrous<br /><br />Chevy Truck valve springs, and that chevy truck Camshaft 340284 with the whopping .410 In lift<br />use identical valve springs to the ones<br />in every 305 marine engine I've dissasembled<br /><br />most of these guys that are asking questions all have 305's, 305's do not have the performance heads or cams. <br /><br />Same OEM springs and cams used in <br />9 out of 10 volvo 305's 4 or 5000 all day whatever dude, keep reading books if thats what it takes for you to give advice worth giving <br /><br />305 200 hp 350 249hp I rest my case<br /><br />and absolutely promise to stay out of these discussions in the future<br /><br /><br />sure truck heads have valve springs designed to run at 4-5 grand all day long. NOT. Mr. Moore is a poster on another board and although i have not read his book ( i'm a ford guy ), he's seems to have knowledge based on experience.<br /><br />bottom line. slap a 1200 motor in a run the **** out of it or spend a little more and have a motor that will last. [/QB][/quote]
 
bomar76

bomar76

Lieutenant Commander
Joined
Jun 27, 2002
Messages
1,963
Re: ENGINE SWAP 305 merc to 350 chev truck

He posts in a couple performance boat sites I frequent......but I am not gonna tell where.
 
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Ralph 123

Captain
Joined
Jun 24, 2003
Messages
3,983
Re: ENGINE SWAP 305 merc to 350 chev truck

Why the heck not? Is it some national security secret? :)
 
bomar76

bomar76

Lieutenant Commander
Joined
Jun 27, 2002
Messages
1,963
Re: ENGINE SWAP 305 merc to 350 chev truck

If they can't find Dennis on their own, they don't need his advice. ;) <br /><br />It's not like he hides or anything.
 
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RatFish

Chief Petty Officer
Joined
Jul 29, 2003
Messages
647
Re: ENGINE SWAP 305 merc to 350 chev truck

Some people are just pompus snots.....
 
bomar76

bomar76

Lieutenant Commander
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Messages
1,963
Re: ENGINE SWAP 305 merc to 350 chev truck

Originally posted by RatFish:<br /> Some people are just pompus snots.....
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Why thank you....
 
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dcpcccrc

Seaman
Joined
Aug 17, 2004
Messages
59
Re: ENGINE SWAP 305 merc to 350 chev truck

sell the truck on ebay and go buy a marine engine
 
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