Compression with Dove C

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Compression with Dove C

Post  nuclearcobra on March 28th 2014, 8:09 am

My buddy has a 466'' motor that dropped a valve and ripped the top and bottom of the guide out, so I'm taking it to the machine shop to see if it can be fixed. I was curious what would be his compression roughly with speedpro L2443NF pistons , I know it depends on how far the piston is in the hole if any, but any ideas say at 0 deck or .010 or .020 in the hole. Maybe I should post a few pics of the damage to see if you guys have repaired a head in this shape.
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Re: Compression with Dove C

Post  dfree383 on March 28th 2014, 9:23 am

It should be in the 13:1 - 13.5:1 range.
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Re: Compression with Dove C

Post  nuclearcobra on March 28th 2014, 10:55 am

Thanks Dave so I guess he can forget mixing 93 & 110 half and half then, the cam is a Lunati solid flat tappet 265-272 @.050 603-609 lift 4000-7400 rpm range which is why I thought it always left like a pig cause the converter cant stall that high, its a thunder bird with a PG trans, 411's and 29x10 slicks , it ran 10.70's but at 131 mph
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Re: Compression with Dove C

Post  nuclearcobra on March 28th 2014, 12:53 pm

Have no idea why it posted my pics like this.
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Re: Compression with Dove C

Post  dfree383 on March 28th 2014, 1:28 pm

Id use strait 110 if it was mine

The head looks repairable, if you have a competent shop.
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Re: Compression with Dove C

Post  466cj on March 28th 2014, 3:30 pm

Have the head checked for cracks before anything else. Does look repairable if not cracked and some cracks can be fixed too. The big question will be cost to repair vs. just getting another head done up. Comes down to cost and peace of mind too.

That piston can have the dome milled down for a lower CR. Can make it a flat top too if that is what you want. Seems a lot of guys are building 14:1 CR engines for drag racing and using E85. A lot cheaper than race gas. Just have to have a fuel system set up for it.

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Re: Compression with Dove C

Post  cool40 on March 28th 2014, 9:34 pm

466cj wrote:Have the head checked for cracks before anything else. Does look repairable if not cracked and some cracks can be fixed too. The big question will be cost to repair vs. just getting another head done up. Comes down to cost and peace of mind too.

That piston can have the dome milled down for a lower CR. Can make it a flat top too if that is what you want. Seems a lot of guys are building 14:1 CR engines for drag racing and using E85. A lot cheaper than race gas. Just have to have a fuel system set up for it.
x2......should be easy fix.IMO
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Re: Compression with Dove C

Post  nuclearcobra on May 3rd 2014, 6:11 am

Well my Buddy Buddy (that's his name  Very Happy ) bought a set of stock Dove c's , the machine shop said it was 250 to cut it for the big valves to match the other head , I've been wondering why the valve locks broke in the first place, and it was getting ready to drop another valve because half of a lock is missing next to the valve that dropped (cheap locks I guess) I couldn't see any marks on the retainer or rocker arm where they rubbed or anything ? Anyway he wanted to know if he decided to put the stock valve heads on for now what cam would be safe to use and work ok , because its high compression , I suggested to have the big valves put in the head to match the old head , I think it has 2.25-1.75 the shop said is that possible in a dove-c ? I know my c8 heads have 2.19-1.72 and there bigger than that. I told him sure you can use stock heads with a smaller cam but that compression is too much for that. Any ideas ?
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Re: Compression with Dove C

Post  cool40 on May 3rd 2014, 12:24 pm

The valve lock issues need addressing first.coil bind or not enough spring psi will beat the locks out.before I run one odd head I'd just wait to do it right.
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Re: Compression with Dove C

Post  nuclearcobra on May 3rd 2014, 6:22 pm

Will a L2443 piston clear a 230-171 valve dove-c with his current cam ?
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Re: Compression with Dove C

Post  dfree383 on May 3rd 2014, 6:24 pm

A 2.30 intake valve will not properly clear the valve pocket on those pistons from my experience
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Re: Compression with Dove C

Post  nuclearcobra on May 3rd 2014, 6:39 pm

Thanks Dave
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