347
Elder User
Joined: Jun 2006
Posts: 654
Likes: 0
Maybe a dumb question, but if you feel 347cid is enough for you, then why not just rebuild the 351 into a 351, save a bunch of coin for other mods, and still have 4 more cid?
Not to mention, but in either case, you're talking about the same exact heads, therefore they're the same restriction.
How much is the 347 stroker kit you're looking at? Why not build a 351, but spend the extra coin on a set of nice aftermarket heads?
Not to mention, but in either case, you're talking about the same exact heads, therefore they're the same restriction.
How much is the 347 stroker kit you're looking at? Why not build a 351, but spend the extra coin on a set of nice aftermarket heads?
Senior User
Joined: Jan 2003
Posts: 404
Likes: 0
i'm building a 347 EFI stroker for my F150. I have some home ported E7TE heads for it. Its going to be pushing close to 300 hp and over 400 Ft lbs of torque. The main reason for the 347 rather than the 351 is ease of installation. I dont need a complete donner vehical to get installed i just bolt all the old EFI stuff up and get my chip reflashed for the extra cubes and maybe tune it on the chassis dyno. Even with the whipped 302 installed with headers/ported E7s and explorer camshaft its was able to pull 200 hp and 287 ft lbs at the rear wheels after the chip was burned.
Thread Starter
|
Senior User
Joined: Sep 2006
Posts: 125
Likes: 0
From: Mt. View Hawaii
I was looking on summit at the stroker kits again and discovered that they don't sell a 393 stroker kit with dished pistons. I want to be able to run on pump gas. I did find this kit though part number ESP-16524030 on summit that comes with dished pistons but it also bumps displacement up to 408. About what would the compression be with those pistons and stock 69 351 heads? Would the 351 heads still work?
as long as youre not trying to revv to 6000+ youre good with the 351w heads... theyll be fine for a 408 up to around 5500, so cam conservatively 
Thread Starter
|
Senior User
Joined: Sep 2006
Posts: 125
Likes: 0
From: Mt. View Hawaii
Will the bellhousing be the same between the 302 and 351? The 408 kit says that it is externally ballanced with 28 oz imbalance. Does that mean I need the 28 oz or older style flywheel and harmonic balancer or how does that work? Do I just need to find a 351 flywheel or did the balance change over the years? I know that the 302 changed balance weight over the years.
Last edited by Lee250; Jun 25, 2007 at 10:27 PM.
Posting Guru
Joined: Mar 2006
Posts: 1,526
Likes: 2
From: fargo, nd
im pretty sure the 351w was always a 28oz imbalance, and the 302 changed from 28oz to 50oz i think in 1985. bellhousing will be the same. youll want to have the whole rotating assembly balanced once you get it as well. you should be able to get a flywheel off any 351w and itll work fine, just whatever flywheel and balancer you get you have to take them in with the rotating assembly and have the whole thing balanced... if you dont you could wipe your engine bearings pretty quick... and if its too out of balance it could break your new crank
Last edited by darrin1999; Jun 26, 2007 at 02:23 AM.
Thread
Thread Starter
Forum
Replies
Last Post
apachetech
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
3
Feb 15, 2012 08:24 AM
Brett1989
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
19
Sep 3, 2008 01:01 PM
darrin1999
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
8
Apr 5, 2007 11:18 PM
