lol.. who said they were running 10:1 compression? hell they don't even have to run stock cubic inches.. no telling what those motors are.. they appear stock and kinda sound stock and thats where it ends...,.
2.00 ENGINE
2.01 Engine block must appear to be a correct* original block and must be of the same engine family and exterior size.
The block must be made from the same material as the correct* original block. Approved aftermarket replacement blocks are allowed (see list below).
If you want to use an aftermarket block that is not already preapproved it is up to the individual to submit all the necessary information to the FASTRACES LLC so the block in question can be properly investigated.
(part numbers, casting numbers, web site links, company names, phone numbers, etc)
Raised decked and raised cam blocks will not be approved. There will be a 560 cubic inch limit on all engines except the Ford 429/460 based power plants which will be allowed 620 cubes.
If you think you can get more than the allotted cubic inches out of a stock production block you will have to contact the FAST Board of Director and have your combination approved prior to racing.