higher cr for 360
Super Moderator
Joined: Apr 2004
Posts: 34,495
Likes: 2,809
360 rod = 6.540 approx
So: 1.892 + 6.540 + 1.678 = 10.110
10.17 - 10.110 = .060
So your piston will still be down the hole .060 on a weaker rod.
This is a partial "solution" if you have all those parts but have no access to any other parts.
It does, however, take an 8.2 CR to 8.97 based on a calculator I used along with the standard info for a 390 with those pistons.
The better solution, since you have the engine pretty much all the way apart to make the above switch, is to keep your 390 rods and put in 360 spec pistons. (1960s 390 2bbl "Regular Fuel" spec pistons)
Logistics Pro
Joined: Feb 2011
Posts: 3,522
Likes: 11
From: Townsend, MT
Low compression 390s use the 410 piston. CH 1.678".
360 rod = 6.540 approx
So: 1.892 + 6.540 + 1.678 = 10.110
10.17 - 10.110 = .060
So your piston will still be down the hole .060 on a weaker rod.
This is a partial "solution" if you have all those parts but have no access to any other parts.
It does, however, take an 8.2 CR to 8.97 based on a calculator I used along with the standard info for a 390 with those pistons.
The better solution, since you have the engine pretty much all the way apart to make the above switch, is to keep your 390 rods and put in 360 spec pistons. (1960s 390 2bbl "Regular Fuel" spec pistons)
360 rod = 6.540 approx
So: 1.892 + 6.540 + 1.678 = 10.110
10.17 - 10.110 = .060
So your piston will still be down the hole .060 on a weaker rod.
This is a partial "solution" if you have all those parts but have no access to any other parts.
It does, however, take an 8.2 CR to 8.97 based on a calculator I used along with the standard info for a 390 with those pistons.
The better solution, since you have the engine pretty much all the way apart to make the above switch, is to keep your 390 rods and put in 360 spec pistons. (1960s 390 2bbl "Regular Fuel" spec pistons)
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