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FireSale · 12-10-2018, 11:05 PM

What's the application here? It doesn't really make sense to talk pressures when we don't know what is being asked of the engine. I run PAC 1427 springs - conical for a BBC - in a SBF with NASCAR type iron heads. Stuff gets mixed up when all you want is GO...

Note: A PAC 1409x at 1.8 will give you pressures of 175/384. I'd give up on a 1.78 IS, it's too hard to shim to. 1.8 or 1.85 are common.

Note 2: What is the seat size?

Ask questions and give info. I didn't so I have 4 sets of springs now............

12-10-2018, 11:05 PM	#7
FireSale VIP Member Join Date: Feb 2014 Location: Lakewood Washington Posts: 1,407 Likes: 29 Liked 237 Times in 126 Posts	Re: math class needed on valve springs What's the application here? It doesn't really make sense to talk pressures when we don't know what is being asked of the engine. I run PAC 1427 springs - conical for a BBC - in a SBF with NASCAR type iron heads. Stuff gets mixed up when all you want is GO... Note: A PAC 1409x at 1.8 will give you pressures of 175/384. I'd give up on a 1.78 IS, it's too hard to shim to. 1.8 or 1.85 are common. Note 2: What is the seat size? Ask questions and give info. I didn't so I have 4 sets of springs now............ __________________ Dale Shearon 68 Mustang 6394 Last edited by FireSale; 12-10-2018 at 11:24 PM.