Factory cam?
Le Mans Master
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From: Tampa Bay FL
If it were me, I would go with the Crane Energizer 272 H10 grind. I had good experience and it provided very snappy performance.
Race Director
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There was no 350 in the Corvette from the factory in 1968, it was a 327 and there was more than one version. So try to find out exactly what you have and what you really want. There are numerous sources for camshafts.
Safety Car
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From: Bridgewater nj
68 still had high compression pistons. So this is something you need to find out from the block or head numbers. Choosing a cam is based off your compression and intended use.
A small cam can give you great torque but cause pinging from crap fuel, if the compression is too high.
A big cam can avoid pinging but can cause a lazy engine at low rpm if the compression is too low.
A small cam can give you great torque but cause pinging from crap fuel, if the compression is too high.
A big cam can avoid pinging but can cause a lazy engine at low rpm if the compression is too low.
Race Director
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all that casting number tells you is that the block is 1968 to 1979 and is a 302 or a 327 or a 350 with 2 bolt main. On the passenger side front of the block where the cylinder head meets it there is a pad with a letter code, can you post that?
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Le Mans Master
Joined: Feb 1999
Posts: 8,351
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From: Tampa Bay FL
68 still had high compression pistons. So this is something you need to find out from the block or head numbers. Choosing a cam is based off your compression and intended use.
A small cam can give you great torque but cause pinging from crap fuel, if the compression is too high.
A big cam can avoid pinging but can cause a lazy engine at low rpm if the compression is too low.
A small cam can give you great torque but cause pinging from crap fuel, if the compression is too high.
A big cam can avoid pinging but can cause a lazy engine at low rpm if the compression is too low.
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8th Gear
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Le Mans Master
Joined: Feb 1999
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From: Tampa Bay FL
Team Owner
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Le Mans Master
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From: Tampa Bay FL
I think you may be able to establish whether you are base or 350hp motor from cranking pressure. I'm not that knowledgeable but others may chime in. You could always pull the cylinder heads to check the piston (domes) or valve dimensions.
Are your cylinder heads 'camel hump' heads? That may tell you something (if they are original).
Anybody: Are camel hump heads indicative of 350hp engine?
Are your cylinder heads 'camel hump' heads? That may tell you something (if they are original).
Anybody: Are camel hump heads indicative of 350hp engine?
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Burning Brakes
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From: CA
Without a suffix code, there's no way to know which engine it started out as, and even if you DID have the suffix code, who knows how many times the engine's been rebuilt over the last 45 years.
The 3914678 block was used for the 302, 327 and 350 engines in 1968, so it could be any number of things.
You can pull the valve covers off and see what the casting numbers are for the heads, but again, heads were machined for different sized valves, so the casting number alone may not help. You may have to pull the heads to see what size the valves are. You may also have to pull the transmission out to see what crank you actually have in there. Since that block could be a 302, 327 or 350, you need to know what you actually have before you start looking for parts!
Ed
The 3914678 block was used for the 302, 327 and 350 engines in 1968, so it could be any number of things.
You can pull the valve covers off and see what the casting numbers are for the heads, but again, heads were machined for different sized valves, so the casting number alone may not help. You may have to pull the heads to see what size the valves are. You may also have to pull the transmission out to see what crank you actually have in there. Since that block could be a 302, 327 or 350, you need to know what you actually have before you start looking for parts!
Ed