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Old 8 Oct 2019, 17:28 (Ref:3932741)   #391
FISCracer
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Originally Posted by Duddha View Post
As I say, some do cheat! But for papers, you need to use a period casting number or provide evidence that the engine block dimentionally and structurally complies with period. For GM/Corvette engines, it's known that some period blocks are no longer available but equivalent can be find through GM even though it is now sold for different application and with different casting numbers.
So Louis is a later 18V block acceptable in an MGB , TVR, Elva or only the earlier 18GA, GB, GG etc?

Thanks
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Old 9 Oct 2019, 10:11 (Ref:3932879)   #392
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Originally Posted by FISCracer View Post
So Louis is a later 18V block acceptable in an MGB , TVR, Elva or only the earlier 18GA, GB, GG etc?

Thanks
Nope, the engine block has to be period unless you prove that as an alternative it's in accordance with 3.6.7.1 which means dimensionally and structurally equal to the period one.
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Old 9 Oct 2019, 10:13 (Ref:3932880)   #393
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Thanks, there was only one casting number used for the 69 to 70 iron block 427cu and 454cu Corvette and that was 3963512, these are difficult to get hold of especially this side of the Atlantic.

The tall deck blocks are only for trucks as they have a lower compression ratio.

So I could use a later block with a different casting number but I don't know of anyway to prove that these are exactly the same. If the FIA doesn't have a list I can't find a way to do this without building a car and applying for an HTP which could be pointless.

I've had my current historic race car for 25 years and it's becoming less and less fun, it just seems that nowadays there is a requirement to be stupidly rich so you can pay your specialist who knows someone and then you're able to run your McLaren with a modern Dart block or your Mini with a dog box.

Sorry for the rant but I've spent months chasing engine builders, not for advice, but to build me an engine but no one ever gets back to me, even after going to see them and I've just about given up on the idea. Same with other bits of Corvette. I've never come across a marque of car where the specialist are almost to a man completely unhelpful. I just don't get how people can turn down 10, 15 or 20 grands worth of work. Guess I should have got a Ford.
I would just say that relying on third parties to give an answer is not a way forward. If you buy the books and records of the GM castings, you will find your answer and possibly your needs.

The fact that an engine block is hard to find has never given a way around, which is different to total and proven non-availability.
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Old 9 Oct 2019, 11:40 (Ref:3932890)   #394
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I would just say that relying on third parties to give an answer is not a way forward. If you buy the books and records of the GM castings, you will find your answer and possibly your needs.

The fact that an engine block is hard to find has never given a way around, which is different to total and proven non-availability.
I have the books and the casting numbers, I'm not relying on third parties, I've been researching this for months and have got nowhere close to a definitive answer. I hoped that maybe the FIA had a list of acceptable parts in the same as does for Lotus Elans for example.

I only signed up here as a last resort and was not just looking for an easy way out.

Thanks for your replies.

I will endeavour to source a period block, which I've also been trying to do all this time.
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Old 16 Nov 2019, 09:30 (Ref:3940894)   #395
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zefarelly should be qualifying in the top 3 on the gridzefarelly should be qualifying in the top 3 on the gridzefarelly should be qualifying in the top 3 on the grid
lotus elans are easy. . . . everythings available new . . . looks like original but just a bit better on the inside.
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Old 18 Nov 2019, 11:07 (Ref:3941370)   #396
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PeterMorley should be qualifying in the top 5 on the gridPeterMorley should be qualifying in the top 5 on the grid
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lotus elans are easy. . . . everythings available new . . . looks like original but just a bit better on the inside.
Presumably these parts have been identified by the FIA as being suitable, so there is a list of them?

In which case would it not be possible for the FIA to compile a list of original parts that are considered to be suitable - e.g. when an alternative casting number block is accepted for one car then it is added to the list?

I'm intrigued by how the process works/what research the FIA do, having been asked to prove the period use of rose joints on a car when there are other examples that already had FIA papers.
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Old 18 Nov 2019, 11:16 (Ref:3941372)   #397
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So Louis is a later 18V block acceptable in an MGB , TVR, Elva or only the earlier 18GA, GB, GG etc?

Thanks
You have to demonstrate non-availability.

For GM castings, you have to understand they are the same but other applications and from same period. Basically another plant, marine, etc.

People have tried for Alfa and other cars but couldn't demonstrate unavailability.
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