SilverStubby
Active Member
Hey guys, I'm trying to make some budget power from the junkyard to make my $500 87 B150 van run a bit better. It's got the factory 2 barrel carb and single exhaust, so it'll be hard to make less power.
Motor: 318 (unknown year, unknown components, I assume factory 1970-80's, will dig into more, we knew it ran and it was sitting in the shop so we plugged it in.)
The plan now is to use some junk magnum heads from the yard (I know they're probably cracked but I don't care, my 96 magnum van ran great for 170k), install some GM springs and do some quick port cleaning. I'll be adding a 4 barrel carburetor, intake, possibly headers.
I plugged in some of the valve spring info I found online for the GM 3100 spring, thanks to Patrick at the Moparts forum.(new cheap magnum spring upgrade for moderate cams) I used a bind clearance of 0.09" which gave me a max lift of 0.485 with a 1.6 ratio rocker.
Below is the cam info I worked out, the whiplash cam from hughes caught my eye but I had to work backwards from the specs they give and do some guessing to compare it to the other cams. The lift was too large.
I went way further into this than I should have but I wanted to make the info available if anyone ever wished to use it. Nothing has been purchased since I'm still confined to my house... hopefully be able to make it to the salvage yard soon. Also, debating to just use some 302 smog heads, better springs and a bigger cam. I liked the larger valve and smaller combustion chamber the magnum heads have... as well as the 1.6 ratio rockers.
Would like to also put in an OD trans from a 91 dodge and a posi rear end.
-John
Motor: 318 (unknown year, unknown components, I assume factory 1970-80's, will dig into more, we knew it ran and it was sitting in the shop so we plugged it in.)
The plan now is to use some junk magnum heads from the yard (I know they're probably cracked but I don't care, my 96 magnum van ran great for 170k), install some GM springs and do some quick port cleaning. I'll be adding a 4 barrel carburetor, intake, possibly headers.
I plugged in some of the valve spring info I found online for the GM 3100 spring, thanks to Patrick at the Moparts forum.(new cheap magnum spring upgrade for moderate cams) I used a bind clearance of 0.09" which gave me a max lift of 0.485 with a 1.6 ratio rocker.
Below is the cam info I worked out, the whiplash cam from hughes caught my eye but I had to work backwards from the specs they give and do some guessing to compare it to the other cams. The lift was too large.
I went way further into this than I should have but I wanted to make the info available if anyone ever wished to use it. Nothing has been purchased since I'm still confined to my house... hopefully be able to make it to the salvage yard soon. Also, debating to just use some 302 smog heads, better springs and a bigger cam. I liked the larger valve and smaller combustion chamber the magnum heads have... as well as the 1.6 ratio rockers.
Would like to also put in an OD trans from a 91 dodge and a posi rear end.
-John