64 L76 rebuild advice requested
04-16-2015, 04:10 PM
#1
Instructor
Thread Starter
64 L76 rebuild advice requested
64 L76 needs rebuild, had a rod bearing spin. Now looking at complete rebuild. I'd prefer to stick to OE specs (heads / compression / cam), repair shop is suggesting lowering compression. Thoughts?
04-16-2015, 04:16 PM
#2
Burning Brakes
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I think that the engine is the heart of the vette and I like the stock sound, rumble and power. Gas is the problem, but my vote is keep a vette a vette.
Dom
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Dom
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04-16-2015, 04:20 PM
#3
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04-16-2015, 04:46 PM
#4
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Yep! And don't let them talk you into hardened valve seats.
04-16-2015, 05:02 PM
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Find a machine shop that understands what your after
04-16-2015, 05:37 PM
#6
Race Director
If you lower the compression like the shop wants and install the OEM 30-30 cam, you will likely sell the car after the first test ride. 
You need an honest (actual measured) 10.5 to 11.0 compression to make the 30-30 cam bearable on the street…………..and even then 4.11 gears are almost a must.
Larry
You need an honest (actual measured) 10.5 to 11.0 compression to make the 30-30 cam bearable on the street…………..and even then 4.11 gears are almost a must.
Larry
Last edited by Powershift; 04-16-2015 at 05:42 PM.
04-16-2015, 06:20 PM
#7
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Do not let the machine shop deck the engine pad with the numbers. Put it in writing. 
Dennis
Dennis
04-16-2015, 06:21 PM
#8
Instructor
Thread Starter
Most machine shops don't have a clue about Corvette L-79 and L-76 engines that run just fine on pump premium with 11:1 Compression. Stick with all OEM-grade parts (pistons, cam, etc.) and build it to all OEM specs/clearances. There is NO REASON to "reduce compression". DO NOT use an aftermarket cam - the OEM cam is what allows these engines to run at 11:1 on pump premium.
04-16-2015, 06:23 PM
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04-17-2015, 10:47 AM
#11
Safety Car
Don't let him do it. In fact, the compression ratio can stand a 1/2 point increase easily. Use the Speed Pro CS118R cam. Having the heads pocket ported will give a good power boost. Use a Melling 10553 oil pump if you decide to replace the original.
04-17-2015, 12:06 PM
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04-17-2015, 12:17 PM
#14
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Meeting tomorrow with repair shop they have been great in the past. I am confident they will work to provide me what I am looking for. Thanks for all the feedback and advice
04-17-2015, 12:23 PM
#15
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Also if they must deck the block have it in writing they can not touch the numbers. They can stop before. If they can't agree to that find anther shop. But chance are no decking will be required. Shops just like to push that on people who do not know any better. That stamp pad if original to the car is worth a lot to the cars value. And if it's touched or damaged you just lost it forever
04-17-2015, 12:25 PM
#16
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Also if they must deck the block have it in writing they can not touch the numbers. They can stop before. If they can't agree to that find anther shop. But chance are no decking will be required. Shops just like to push that on people who do not know any better. That stamp pad if original to the car is worth a lot to the cars value. And if it's touched or damaged you just lost it forever
04-17-2015, 12:29 PM
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04-17-2015, 01:16 PM
#19
Safety Car
Most machine shops don't have a clue about Corvette L-79 and L-76 engines that run just fine on pump premium with 11:1 Compression. Stick with all OEM-grade parts (pistons, cam, etc.) and build it to all OEM specs/clearances. There is NO REASON to "reduce compression". DO NOT use an aftermarket cam - the OEM cam is what allows these engines to run at 11:1 on pump premium.
If you end up having an issue, which is unlikely, just take a degree or two out of the timing.
04-18-2015, 05:59 PM
#20
Instructor
Thread Starter
Great meeting with shop today. Thanks for the input Staying with OE cam, forged 11 to 1 Pistons. New rods and DO NOT TOUCH the stamp pad
