351 vs 302 with same parts.....

Ohsplat · May 2nd, 2011, 12:34 AM

Please stay on topic as I am still deciding which engine to build. I do not care about center of gravity, or weight.

So the question.. I am asking for a ballpark est of both of these engines horsepower built as an economy build with these parts.

Gt40p Heads
Victor Jr intake
stock HO cam
1.6 roller rockers
balanced crank, pistons, rods.
Holley 600 cfm carb

Both the 351 and 302 would be roller motors.

93hatch · May 2nd, 2011, 12:36 AM

random combo. 302 would prob be faster due to getting more rpms so outa said crappy combo so you can gear it steeper

fogged306 · May 2nd, 2011, 12:41 AM

Stock HO cam, 600cfm carb, and GT-40 heads are going to choke the shit out of a 351. That vic jr on that combo isn't helping. That is a pretty big mismatch you got there. I agree, probably better on a 302.

Ohsplat · May 2nd, 2011, 12:44 AM

Cool. this is basically the parts I have laying around the house. So if i stepped up to a 750 double pumper and a torqer2 would that help? I have those as well

ryanw · May 2nd, 2011, 12:48 AM

750 seems a little big to me but I'm not a carb man, but if i had to take a guess id think 650 would be more up your alley on a 302, but i may be wrong

fogged306 · May 2nd, 2011, 12:49 AM

If you put the right cam in that, you could put those on the 351 and be in decent shape. You'd still be choking the cubes with those GT-40's, but it will be better than the first combo on either deck block... you do know that you can't use an intake for a 302 on a 351 and vice versa right?

Ohsplat · May 2nd, 2011, 12:59 AM

Yeah i know about the intakes. I have like 6 carbs that came in this mustang when I bought it lol. I would replace the GT40s at some point with twisted wedges but this is just to get me running. Any idea on what the 351 would have in HP with the 750cfm torqer2 and gt40s?

MustangMatt96GT · May 2nd, 2011, 09:47 AM

You would probably put right around 270-280 horse to the ground... Corrected SAE numbers... Infact im building the exact engine right now with my buddy and it will never get on the dyno, but it will have track numbers....

flyin ryan · May 2nd, 2011, 10:29 AM

I would say rock a stock motor until you can save enough fundage to throw a set of good heads on the 351 shortblock because its not worth the swap with those parts in my opinion.

Stdyhand · May 2nd, 2011, 10:46 AM

IF this is only to get you running but you plan to mod it later I'd say go with the 351. It will already be in the vehicle and you can add heads and a cam later.

If you don't think you'll be modding it too much I'd say go with the 302 for a little less weight and probably a little better fuel economy if that means anything to you.

Either way your going to start off with 302 power with that combo. Now you put a set of heads and cam in that 351 later and you'll produce much more power.

Ohsplat · May 2nd, 2011, 12:05 PM

Thanks for all the info. I look forward to seeing those track numbers when you get that engine in! I think I will do the 351. I have no engine in at all now so to swap in a 351 wont be much more work then putting in a 302.

any idea of which headers to use with a 351 and P heads in a mustang?

Stdyhand · May 2nd, 2011, 12:23 PM

Originally Posted by Ohsplat

Thanks for all the info. I look forward to seeing those track numbers when you get that engine in! I think I will do the 351. I have no engine in at all now so to swap in a 351 wont be much more work then putting in a 302.

any idea of which headers to use with a 351 and P heads in a mustang?

BBK unequal headers work on the gt40's and clear fine. You will have a limited selection with the gt40p heads. You might find some fairly cheap if you shop around.

69fastback · May 2nd, 2011, 12:32 PM

A Vic jr will raise the CG and you'll tip over

A 750 dp is too big for that. For the combo you listed, I think you'd be better off with the torquer II, and the 650. Unless you're planning on making 450+ at the tires, it'll be cheaper to stick with the 302, and it wil be sufficient. When you go to buy new heads, you can get away with TW170s, and not have to buy the larger, more expensive heads for a 351. Just my opinion.

flattusmaximus78 · May 2nd, 2011, 12:40 PM

^^ The whole getting it running thing is cool if your going to buy heads later, but a 170 twisted wedge is def NOT enough for a 351 based motor.

flyin ryan · May 2nd, 2011, 02:58 PM

^ I agree with these two guys... if your goal is 302 power then go with the 302 shit's cheaper

May 2nd, 2011, 12:34 AM	#1
Ohsplat Enthusiast 1983GT No motor or trans Join Date: Nov 2010 Location: Middle River MD Posts: 540 iTrader: 0 reviews	351 vs 302 with same parts..... Please stay on topic as I am still deciding which engine to build. I do not care about center of gravity, or weight. So the question.. I am asking for a ballpark est of both of these engines horsepower built as an economy build with these parts. Gt40p Heads Victor Jr intake stock HO cam 1.6 roller rockers balanced crank, pistons, rods. Holley 600 cfm carb Both the 351 and 302 would be roller motors.

May 2nd, 2011, 12:36 AM	#2
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	random combo. 302 would prob be faster due to getting more rpms so outa said crappy combo so you can gear it steeper __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 2nd, 2011, 12:48 AM	#5
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	750 seems a little big to me but I'm not a carb man, but if i had to take a guess id think 650 would be more up your alley on a 302, but i may be wrong __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

May 2nd, 2011, 09:47 AM	#8
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	You would probably put right around 270-280 horse to the ground... Corrected SAE numbers... Infact im building the exact engine right now with my buddy and it will never get on the dyno, but it will have track numbers.... __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

May 2nd, 2011, 12:32 PM	#13
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	A Vic jr will raise the CG and you'll tip over A 750 dp is too big for that. For the combo you listed, I think you'd be better off with the torquer II, and the 650. Unless you're planning on making 450+ at the tires, it'll be cheaper to stick with the 302, and it wil be sufficient. When you go to buy new heads, you can get away with TW170s, and not have to buy the larger, more expensive heads for a 351. Just my opinion. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player Last edited by 69fastback; May 2nd, 2011 at 12:52 PM.

May 2nd, 2011, 12:41 AM	#3
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Stock HO cam, 600cfm carb, and GT-40 heads are going to choke the shit out of a 351. That vic jr on that combo isn't helping. That is a pretty big mismatch you got there. I agree, probably better on a 302.

May 2nd, 2011, 12:44 AM	#4
Ohsplat Enthusiast 1983GT No motor or trans Join Date: Nov 2010 Location: Middle River MD Posts: 540 iTrader: 0 reviews	Cool. this is basically the parts I have laying around the house. So if i stepped up to a 750 double pumper and a torqer2 would that help? I have those as well

May 2nd, 2011, 12:49 AM	#6
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	If you put the right cam in that, you could put those on the 351 and be in decent shape. You'd still be choking the cubes with those GT-40's, but it will be better than the first combo on either deck block... you do know that you can't use an intake for a 302 on a 351 and vice versa right?

May 2nd, 2011, 12:59 AM	#7
Ohsplat Enthusiast 1983GT No motor or trans Join Date: Nov 2010 Location: Middle River MD Posts: 540 iTrader: 0 reviews	Yeah i know about the intakes. I have like 6 carbs that came in this mustang when I bought it lol. I would replace the GT40s at some point with twisted wedges but this is just to get me running. Any idea on what the 351 would have in HP with the 750cfm torqer2 and gt40s?

May 2nd, 2011, 10:29 AM	#9
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	I would say rock a stock motor until you can save enough fundage to throw a set of good heads on the 351 shortblock because its not worth the swap with those parts in my opinion.

May 2nd, 2011, 10:46 AM	#10
Stdyhand Regular 1991 Ford Mustang GT Join Date: Apr 2011 Location: Missouri Posts: 213 iTrader: 0 reviews	IF this is only to get you running but you plan to mod it later I'd say go with the 351. It will already be in the vehicle and you can add heads and a cam later. If you don't think you'll be modding it too much I'd say go with the 302 for a little less weight and probably a little better fuel economy if that means anything to you. Either way your going to start off with 302 power with that combo. Now you put a set of heads and cam in that 351 later and you'll produce much more power.

May 2nd, 2011, 12:05 PM	#11
Ohsplat Enthusiast 1983GT No motor or trans Join Date: Nov 2010 Location: Middle River MD Posts: 540 iTrader: 0 reviews	Thanks for all the info. I look forward to seeing those track numbers when you get that engine in! I think I will do the 351. I have no engine in at all now so to swap in a 351 wont be much more work then putting in a 302. any idea of which headers to use with a 351 and P heads in a mustang?

May 2nd, 2011, 12:40 PM	#14
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	^^ The whole getting it running thing is cool if your going to buy heads later, but a 170 twisted wedge is def NOT enough for a 351 based motor. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

May 2nd, 2011, 02:58 PM	#15
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	^ I agree with these two guys... if your goal is 302 power then go with the 302 shit's cheaper

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