SBC Boat Motor Death

[enkeivette]

WOT on the lake for about a mile, dead. It was fun while it lasted. Pulled all the plugs, don't see any sign of failure. The motor does turn over so it hasn't seized up. I have no idea what went wrong.

Here's my question. The motor is a stock 295hp 350ci 2 bolt out of a 67 Camaro. If I bolt those heads onto my L48 motor that is sitting in my garage, will they up the compression enough to make decent power? Also, would it be a bad idea to use the Camaro cam in the L48? Seeing as how it is probably really old? If I get it machined for reuse, will it have less lift? Can a cam even be turned like a crank?


So basically what I'm asking is, do I run the stock L48 in the boat? Or should I make a franken motor?

 

[MYBAD79]

Cams are so cheap, not worth regrinding.... flat tappet cam and lifters is like $100 or so....

The heads should work on your L48, any idea what the chamber size is ? Stock was what? 76cc ??

 

[enkeivette]

Still in school, $100 is a big expense to me right now. We'll see if I get a summer job.

I have no idea the stock cc. I was hoping you guys would know. I'll google some stuff and report back.

 

[enkeivette]

Looks like the Camaro heads are 64cc.

 

[enkeivette]

Here's another question. After driving this thing on the lake, I can tell that 4K rpm at WOT for 10 mins straight will be a rountine thing. Will the L48 cast pistons hold up?

 

[enkeivette]

Well I played around with an engine calculator, I input average specs for a SBC (like .025 PTD, .041 HG) with the 76cc heads and I gave the pistons a -6cc dish to yield a 8.5:1 CR, which I believe is stock.

Changed only the head cc to 64, actually 63.3 and the CR jumps to 9.7, which I think should make decent power. So it looks like I'll be building a franken motor.

 

[Solid LT1]

If it is trully a 67 Camaro 350 block that b;ock is a special casting and can be sold for some $$$ to a camaro guy. The 67 350 had the hole in the rear for a smog tube like a 327 but was a 1 year only casting.

 

[MYBAD79]

64cc is typically giving you 9.5:1 CR with stock pistons, not too shabby....
I think 76cc is stock for most gen 1 SBCs....

when I say $100 for a cam and lifters, that is less than any company will charge you for re-grinding that old cam.... you still want new lifters with a re-ground cam....

the stock L48 with a little over 9:1CR will be ok... not a screamer but ok for the money spent..... if you're on a budget just use the parts you got and enjoy the boat... :thumbs:

 

[mrvette]

WOT on the lake for about a mile, dead. It was fun while it lasted. Pulled all the plugs, don't see any sign of failure. The motor does turn over so it hasn't seized up. I have no idea what went wrong.

Here's my question. The motor is a stock 295hp 350ci 2 bolt out of a 67 Camaro. If I bolt those heads onto my L48 motor that is sitting in my garage, will they up the compression enough to make decent power? Also, would it be a bad idea to use the Camaro cam in the L48? Seeing as how it is probably really old? If I get it machined for reuse, will it have less lift? Can a cam even be turned like a crank?


So basically what I'm asking is, do I run the stock L48 in the boat? Or should I make a franken motor?

Why not just fix what you got right in the boat, instead of pulling it, which is a huge PIA what with alignment fixtures/tools, etc.....if it's not seized, it sounds fixable...no??

 

[DWncchs]

Check the connector in the red circle,if its dirty or loose it can shut down the engine. :lol:

 

[big2bird]

WOT on the lake for about a mile, dead. It was fun while it lasted. Pulled all the plugs, don't see any sign of failure. The motor does turn over so it hasn't seized up. I have no idea what went wrong.

Spark or fuel.
Check the compression.

 

[big2bird]

Still in school, $100 is a big expense to me right now. We'll see if I get a summer job.

And you own a boat?:tomato::tomato::tomato:

 

[enkeivette]

Still in school, $100 is a big expense to me right now. We'll see if I get a summer job.

And you own a boat?:tomato::tomato::tomato:

I absolutely did not have the money for this boat. I was fantasizing about buying one of these for a few years, always looking on craigslist for fun. I almost did buy one back when I had a job. Anyways, I found this one sooo cheap you wouldn't believe it. They guy who sold it to me needed bail money quick.

I can easily turn it around and sell it for three times the amount of money it cost, including the money I put into it. Minimum, I will come out with 300%. I would have been dumb not to buy it.



I found out how how to fix the motor. It was pretty involved. I had to plug the coil wire back in. :blush: I'm used to an HEI okay! No separate coil wire to check! Leave me alone!!!

Still, it's nice to know I have a spare shortblock.

 

[enkeivette]

WOT on the lake for about a mile, dead. It was fun while it lasted. Pulled all the plugs, don't see any sign of failure. The motor does turn over so it hasn't seized up. I have no idea what went wrong.

Spark or fuel.
Check the compression.

Where were you when I was dead on the water?

 

[mrvette]

WOT on the lake for about a mile, dead. It was fun while it lasted. Pulled all the plugs, don't see any sign of failure. The motor does turn over so it hasn't seized up. I have no idea what went wrong.

Spark or fuel.
Check the compression.

Where were you when I was dead on the water?

On dry land, most likely.....:waxer::yahoo:

 

[big2bird]

I found out how how to fix the motor. It was pretty involved. I had to plug the coil wire back in. :blush: I'm used to an HEI okay! No separate coil wire to check! Leave me alone!!!

Glad to hear it Adam. I bet we don't forget that lesson.:clap: