Time for more motor mods
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Time for more motor mods
Well I finally got a new job and im ready for more motor mods. True duals with X pipe and flowmaster 44s are going to be put on next week and after that im ready for more. Pretty much all I have is LT headers,plugs,wires,dist cap. Im wanting to dump all my money into the motor and want to know the best way to go. I was thinking I would build the current motor to a 331 or 347. But I was wondering if it would be easier to drop a 351 in it and have even more cubic inches. Or maybe even just building up the 302 without boring/stroking it?
Another thing im wondering about is if I should stay EFI or go with a carb for any of these setups. Maybe a MAF swap to start off with?
I have another truck I can drive any time I need to so my truck can sit while all this work is being done.
Another thing im wondering about is if I should stay EFI or go with a carb for any of these setups. Maybe a MAF swap to start off with?
I have another truck I can drive any time I need to so my truck can sit while all this work is being done.
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Joined: Jan 2001
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From: Virginia
I 2nd that. Put a 351w in there. Cross your fingers that the exhaust will bolt back up though. I would say it should, but if your duals for the 302 come close to the frame on the outside of the pipes, then it may not work. When you put the 351w in there, it is wider than the 302.
Postmaster
Joined: Jun 2007
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From: Sweetwater Texas
Go with the 351w, the pipes should be really close to fitting. You will probably need to redo a little bit of the pipes anyway cuz you really need to put headers on that 351w, cuz it will really wake that motor up
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From: Virginia
Carb would be easier and more old school. You may be more comfortable with that. But efi sure is nice too as far as starting in cold weather.
But, if it were me and I wanted to get it running, I would go with a carb I think.
But, if it were me and I wanted to get it running, I would go with a carb I think.
Junior User
Joined: Nov 2008
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From: SoCal...Camarillo, CA
MAF swap isn't necessary unless you make a large change to the amount of vacuum for the MAP sensor, for example using a fairly large cam will do that.
if it was me, I would go with a 351w, AFR 185 or 205 heads, edelbrock victor jr. EFI intake manifold, 24lb injectors, lightning/gt40 351w lower intake manifold with a gt40/explorer/cobra upper intake manifold, 70mm throttle body, and keep the stock cam and SD EFI.
It will make about 310rwhp/360rwtq, and rev to about 5500 with good power. Later on, a MAF swap with an 80mm MAF sensor housing and a larger cam like an anderson motorsports N-41 with a roller conversion would be a great bolt on.
if it was me, I would go with a 351w, AFR 185 or 205 heads, edelbrock victor jr. EFI intake manifold, 24lb injectors, lightning/gt40 351w lower intake manifold with a gt40/explorer/cobra upper intake manifold, 70mm throttle body, and keep the stock cam and SD EFI.
It will make about 310rwhp/360rwtq, and rev to about 5500 with good power. Later on, a MAF swap with an 80mm MAF sensor housing and a larger cam like an anderson motorsports N-41 with a roller conversion would be a great bolt on.
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FTE Legend
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From: Ottawa, Ontario
Except that won't work... the SD computer is calibrated for 19lb injectors so the HP level they support(about 300hp) is as far as you can go. A motor that breathes well enough to require bigger injectors means it also needs programming and/or a MAF upgrade depending upon the cam specs.
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Junior User
Joined: Nov 2008
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From: SoCal...Camarillo, CA
Except that won't work... the SD computer is calibrated for 19lb injectors so the HP level they support(about 300hp) is as far as you can go. A motor that breathes well enough to require bigger injectors means it also needs programming and/or a MAF upgrade depending upon the cam specs.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Ok I think what Im going to do is buy a used 351w for cheap and slowly build it up then when I go to put it in my truck Ill have my AOD built to handle it.
What all can I do with the stock SD on a 351?
What all can I do with the stock SD on a 351?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
I ran 30lb injectors with no tune on my old `87 coupe with a trickflow tw head/anderson ford n-41 cam... I did run the o2 sensors disconnected (to keep the ECU in open loop) and used an adjustable fuel pressure regulator and a wideband a/f monitor (LM-1) to set the fuel pressure.
FTE Legend
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From: Ottawa, Ontario
Assuming an SD 5.8 computer it'll work as well as similar mods to the 5.0, that includes cams that actually open the valves, head porting and exhaust work, that will stretch the 19lb injectors for all they're worth and generate close to 300hp. And you can have stock like idle and drivability as long as the cam is SD EFI friendly, that means less than 215 deg duration at 50 thou, and at least 114 deg LSA.
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From: SoCal...Camarillo, CA
The guts of it are in my `89 4cyl coupe now, and it doesn't really run all that different with MAF, the MAF setup needed a tune just as much as the SD setup did, it was just nice to have tweecer forums to get a baseline for the MAF that I'm running to get it close.