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  #1  
Old 07-09-2010, 10:37 AM
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5.8 motor ideas

okay so i just picked up an 86 351 ho the other day. im trying to decide what to do with it as far as build up. should i buy a 427 stroker kit for it or should i leave it the 351 and just put good heads on it. i've seen a 351 with good heads and a cam hit over 350hp. but im looking at around 500.00 to rebuild just the bottom end of the 351 (grind crank, new pistons and rebuild rods) and that will include new bearings. now for a touch over 1000.00 i can get the street fighter 427 kit from coast high performance. im leaning twords the 351 with a good cam and heads. and this is all going to be shoved into a late model mustang. i'd be pretty happy with 400hp and even more torque. i really like the trick flow twisted wedge heads, but i've seen really good things from afr. any ideas anyone?
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Old 07-09-2010, 02:37 PM
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~350hp is no problem at all from a 351.. if you had a running motor there it would make about that with nothing but heads, intake, and exhaust bolted on the stock 351HO shortblock. Both AFR and TFS have lots of options for this displacement that will produce the power you want, a 400inch stroker is actually a bit of a handfull in a light car like a mustang. YouTube - 408w Mustang In Car Pulls And Street Burnouts 408
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Old 07-09-2010, 03:17 PM
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Nice video conanski. I think I want one of those for my F100.
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Old 07-09-2010, 03:30 PM
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Very nice video! Going to have to get a build sheet from you for my truck.
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Old 07-09-2010, 06:20 PM
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wow...lol thats awsome...im just really torn on what to do. i really want something that will be dependable and have awsome torque. if it was all out drag race it'd be a differant story. but since it will spend 99% of its life on the street. im open to sugestions as to what to do. i can get an eagle cast 4" crank for 270.00 and it would cost a little over a 120.00 to have the stock crank cleaned up. i just dont want to buy something that might not handle some abuse. all i know is its going to have to sound pretty mean, and have what it takes to back it up.
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Old 07-10-2010, 11:42 AM
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Here's a simulation of a fairly basic 351 build using off the shelf parts.. Ford E303 and Comp XE264HR roller cams, AFR185 heads, and something like a TFS-R 5.8 intake on a mostly stock bottom end. I'd suggest upgrading the connecting rods but otherwise the stock crank and block is more than capable of handling this power level. This simulation was with higher compression pistons but even with "stock" spec slugs(9.5:1 CR) you only loose 15-20 points off the peak numbers.

Click the image to open in full size.
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Old 07-11-2010, 12:36 AM
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wow...thats nice...yeah i was thinking eagle sir rods...i've been told they can handle some good power. and i've got no problem running 10.5:1. just need to play with timing a bit.
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Old 07-11-2010, 12:37 AM
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i'd be running a holley 750 carb. as thats what i have right now. what intake is that? im guessing trick flow?
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Old 07-11-2010, 12:51 AM
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so what would i be looking at with a carb set up?
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Old 07-11-2010, 09:08 AM
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Was that simulation you made MAF or SD Conanski?.
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Old 07-20-2010, 08:58 PM
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well my machinist told me go big or go home...he stated if you are going to buy new rods and slugs why wouldnt you put some kind of stroker into it. so...now how big do i go...408? 418? 427? i dont plan on spining anything above 6500-7000 rpm. i asked what he thought of the probe industries stroker kits and he told me for the street they are pretty good. again, im not going to do much racing with it. im open to sugestions as to what size to go to..
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Old 07-20-2010, 10:18 PM
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What I suggest is don't bore the block any more than it needs to be to maintain it's durability, and then whatever displacement that produces with a 4" stroke is what you get.

Here's a carbed example using either Patriot or RHS heads, the Comp Cams 35-243-4 flat tappet, a larger single plane intake and carb, and larger tube headers bolted to a 0.030" over 351 block with a 4" stroker crank installed. The RHS heads can be had for about $1000 fully assembled and flat tappet cam and lifter kits are only about $200. If you packaged this with a cast stroker kit and didn't spend a bundle on the intake and carb the motor could be done for around $3000 or so which is pretty incredible.

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Old 07-21-2010, 12:08 AM
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yeah im thinking either 30 or 40 over bore should clean it all up. you seem to be a big fan of the 408's im torn between that or the monster 427. i asked my machinist about the CHP probe stroker kits and he feels they'd be prefect on the street and has built a couple big inch small blocks using them before. im looking at buying a kit pretty soon so im starting to drool a bit. should i step up to the roller cam? i know that would push it up over the 500hp mark...
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Old 07-21-2010, 01:12 PM
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Your choice in cams depends if you start with a roller motor or not. A roller cam by itself won't make any more power than a flat tappet cam with a similar grind, and installing a roller in a non-roller block will cost at least 3-times as much as a flat tappet so it's not money well spent.
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Old 07-21-2010, 01:52 PM
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its an 86 block so its a non roller block. im thinking flat tappet. to keep costs down just a bit.
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Old 07-21-2010, 01:52 PM
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Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)

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