302 build- speed density?
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Joined: Aug 2012
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302 build- speed density?
Hi, I'm finishing up a 4x4 conversion on my 88 f150 w/ speed density 302 and I now I want to see about getting a little more power out of this thing.
My plans are pretty simple: Cam and heads. I've chosen a lunati voodoo 4x4 cam advertised as safe for speed density. With an LSA of 112 that should be true. What I'm worried about is the heads, I want to use AFR 165s, will these throw the computer off? I really don't want to swap to mass air right now, and I know a lot of the lightning guys still use speed density. One day I plan to put a blown 351 in this thing, I know I'll probably have to swap then, but for now I was hoping a simple cam and heads swap would be safe. What do y'all think? Also, the truck already has a full exhaust with headers and a built AOD.
My plans are pretty simple: Cam and heads. I've chosen a lunati voodoo 4x4 cam advertised as safe for speed density. With an LSA of 112 that should be true. What I'm worried about is the heads, I want to use AFR 165s, will these throw the computer off? I really don't want to swap to mass air right now, and I know a lot of the lightning guys still use speed density. One day I plan to put a blown 351 in this thing, I know I'll probably have to swap then, but for now I was hoping a simple cam and heads swap would be safe. What do y'all think? Also, the truck already has a full exhaust with headers and a built AOD.
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Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The only way the heads will create problems for the stock EFI system is by potentially blowing past the supply limits of the stock injectors and fuel pump, I suggest you get a wideband O2 on it and if it leans out on the topend add more fuel pressure with an adjustable FPR and high flow fuel pump if necessary.
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