351 cleveland head identification Head: Chamber: Port size: Intake valve: Apr 25, 2010 · So if you have a 302 casting number with rail rockers and tubes on the back of the heads connecting them together, you have a 1975-1977 302 head. Other than that they had 4-bolt mains. 50 x 1. Apr 16, 2007 · It appears that these are indeed the "Australian" casting 351c 2V heads which many articles indicate provide much more lower end torque and mate up well with the 351-4V block, so my plan at this point is to go with that setup for my 72 GTS Q-code. Also who knows how to decode them? I will repost after i check if Apr 20, 2008 · What are the casting numbers of the 351C 4V heads - I need to determine of the heads on my 72 4 bolt main block are open or closed chambered (without taking the heads off). I do believe the block is a 4bolt main and may be beefed up in other areas, and it has a solid rollar with stud mounted rockers. This allows for solid lifters and stiffer valve springs = higher RPM = more horsepower. I forgot about the AR for the aussie parts. It is widely concluded that the 351 Cleveland as an engine series lacked any serious performance carburetor options. The Boss heads were also machined for spring cups, not as many people duplicate that so if the head is machined for spring cups there's a better chance it may have originally been a Boss 351 head.
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