efi 406 build, hp expecting? possibly turbo?
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efi 406 build, hp expecting? possibly turbo?
Alright i have a 88 irocz 305tpi iam in the process of building a 400sbc 30 over.. so far i have bought the weiand stealth ram kit, afr 195 heads 65cc, xfi 280 retro fir hydraulic roller cam 280 288 duration @50: 230 236 valve lift 576..eagle rotating assembly all forged mahle pistons, h beam rods 6 inch and a forged crank... what type of horse power could i expect and could i possibly throw a turbo on this set up
Joined: Mar 2000
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
65cc heads will build a lot of compression with the typical flat-top/4-valve-relief pistons. Any idea what the pistons actually are?
Personally, I would never build a high performance 400 with a factory cast block. At a minimum, you should put a half-fill of Hard Blok in it.
While you might be able to turbo it, again, I wouldn't with a factory block. And, if the compression is as high as it sounds like it may be, you're going to need some very good gas.
NA, with a good tune and good exhaust, it should be north of 450 HP at the crank. 500 HP, even, maybe.
Personally, I would never build a high performance 400 with a factory cast block. At a minimum, you should put a half-fill of Hard Blok in it.
While you might be able to turbo it, again, I wouldn't with a factory block. And, if the compression is as high as it sounds like it may be, you're going to need some very good gas.
NA, with a good tune and good exhaust, it should be north of 450 HP at the crank. 500 HP, even, maybe.
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Re: efi 406 build, hp expecting? possibly turbo?
65cc heads will build a lot of compression with the typical flat-top/4-valve-relief pistons. Any idea what the pistons actually are?
Personally, I would never build a high performance 400 with a factory cast block. At a minimum, you should put a half-fill of Hard Blok in it.
While you might be able to turbo it, again, I wouldn't with a factory block. And, if the compression is as high as it sounds like it may be, you're going to need some very good gas.
NA, with a good tune and good exhaust, it should be north of 450 HP at the crank. 500 HP, even, maybe.
Personally, I would never build a high performance 400 with a factory cast block. At a minimum, you should put a half-fill of Hard Blok in it.
While you might be able to turbo it, again, I wouldn't with a factory block. And, if the compression is as high as it sounds like it may be, you're going to need some very good gas.
NA, with a good tune and good exhaust, it should be north of 450 HP at the crank. 500 HP, even, maybe.
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Joined: Jun 2014
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Re: efi 406 build, hp expecting? possibly turbo?
65cc heads will build a lot of compression with the typical flat-top/4-valve-relief pistons. Any idea what the pistons actually are?
Personally, I would never build a high performance 400 with a factory cast block. At a minimum, you should put a half-fill of Hard Blok in it.
While you might be able to turbo it, again, I wouldn't with a factory block. And, if the compression is as high as it sounds like it may be, you're going to need some very good gas.
NA, with a good tune and good exhaust, it should be north of 450 HP at the crank. 500 HP, even, maybe.
Personally, I would never build a high performance 400 with a factory cast block. At a minimum, you should put a half-fill of Hard Blok in it.
While you might be able to turbo it, again, I wouldn't with a factory block. And, if the compression is as high as it sounds like it may be, you're going to need some very good gas.
NA, with a good tune and good exhaust, it should be north of 450 HP at the crank. 500 HP, even, maybe.
Last edited by trevor1010; Oct 15, 2014 at 03:49 PM.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Not being sure what your deck height or head gasket thickness is, CR would be more like 11.9-12.0:1.
65cc heads on a 406 with flat tops makes for a pretty tight squeeze.
65cc heads on a 406 with flat tops makes for a pretty tight squeeze.
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From: Cedar Rapids, IA
Car: 1992 Rally Sport
Re: efi 406 build, hp expecting? possibly turbo?
That's up to you, and what you want to do with the car. Worst case with zero deck, CR could be up to 13:1 with 65cc's, depending on your head gasket too. 75's would get you down a little over a full number probably.
But hey, is this a track car only, or are you gonna run it on the street with pump gas? (Good luck with anything higher than 12:1) Meth injection might be something to look into as well
But hey, is this a track car only, or are you gonna run it on the street with pump gas? (Good luck with anything higher than 12:1) Meth injection might be something to look into as well
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