Estimated 351w Horsepower?

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wickedmach1

New Member

Apr 8, 2003

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Austin, TX

Feb 20, 2004

#1

• Feb 20, 2004

• #1

Rebuilding my '69 351w from the parts listed below. Please let me know what you guys think this engine will make in terms of HP and torque at the flywheel. I appreciate everyones help on my past posts to put these parts together. If anyone sees areas that need improvement or overkill, please let me know. Thanks.

'69 351w block bored .030 over
stock stroked crankshaft (3.50 inches)
AFR 185 Cylinder Heads
Speed Pro Forged .030 pistons 9.5:1 compression
Scat 4340 Forged Steel H-Beam Rods
Edelbrock Performer RPM (Ports matched to heads)
Street Demon 750 (mechanical secondaries)
140 gph Electric Fuel Pump
Shaker Ram Air (aftermarket 100% ambient air)
Melling standard volume oil pump
1 5/8 Hedman Ceramic coated shorty headers (1 3/4 ????)
Electric Fan (don't know which one I will use)
March under-drive pulley set
MSD Pro Billet Distributor
CompCams camshaft 35-000-8RF (roller retrofit)
duration @ .050" = 224/232
valve lift w/ 1.6 rocker = .555/.565
Lobe sep. angle = 110
(I need to find out valve overlap???)

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Feb 20, 2004

#2

• Feb 20, 2004

• #2

off the top of my head, i would say something on the order of 450-475 at the flywheel.

 

Edbert

Founding Member

Jul 13, 2002

3,548

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109

Austin TX

Feb 20, 2004

#3

• Feb 20, 2004

• #3

450 is a good number, the 9.5:1 is holding you back a bit. I am using the same CR for using pump gas.

 

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wickedmach1

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Apr 8, 2003

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Austin, TX

Feb 20, 2004

#4

• Feb 20, 2004

• #4

Should I go 10.0:1? I definetly don't want to go over 10.0:1

 

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bnickel

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Aug 21, 2002

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lubbock, texas

Feb 20, 2004

#5

• Feb 20, 2004

• #5

with the aluminum heads and that cam i'd say go 10:1 on the compression, beleive it or not you'll actually get slightly better mileage too, i know you're not really looking for mileage, though

 

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wickedmach1

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Apr 8, 2003

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Austin, TX

Feb 21, 2004

#6

• Feb 21, 2004

• #6

I will be installing the engine in a '70 Mach. I will use a G-Force T-5 tranny with 3.89 gears and 36.5" tall rear tires. I want a street car and will ocassionally drive it on the freeway. I want a serious engine with good HP and torque but want to be able to drive it without having to worry if it will be half way reliable. This is my first engine rebuild so I am not sure what to expect. CompCams thought the cam listed with the other parts that I will be using will make my goal of 425 to 450 HP. Should I change intakes or carbs? Should I step up to 1 3/4 headers? Shorties or long tubes? Should I increase compression to 10.0:1. Thanks for the help.

 

Mach-One-Man

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Dec 12, 2002

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The Keystone State

Feb 21, 2004

#7

• Feb 21, 2004

• #7

More realistic HP numbers would be 380 to 425. I have the same combo except for World heads, Weind stealth & 750 cfm & the builder dyno sheet was 420 hp @ 5800.

 

ZStanger

Founding Member

Mar 10, 2002

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Pity City

Feb 21, 2004

#8

• Feb 21, 2004

• #8

36.5" tall tires?

I friend of mine has an F-150 w/ a lift kit with 36" tires on it...


Going off-roading?

 

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wickedmach1

New Member

Apr 8, 2003

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Austin, TX

Feb 21, 2004

#9

• Feb 21, 2004

• #9

Sorry, 26.5" tires. That sounds better!

 

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wickedmach1

New Member

Apr 8, 2003

376

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Austin, TX

Mar 10, 2004

#10

• Mar 10, 2004

• #10

I am still confused on which cam to use, mech flat tappet or roller? Please help????

 

B

bnickel

Founding Member

Aug 21, 2002

5,640

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lubbock, texas

Mar 10, 2004

#11

• Mar 10, 2004

• #11

i think the cam you picked will be fine for your goals, i would also go with 10:1 compression. otherwise it sounds like you have a pretty sound combo there

 

F

fastcoupe68

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Mar 10, 2004

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nj

Mar 10, 2004

#12

• Mar 10, 2004

• #12

good combo of parts solid roller makes more power but then you have to adjust every so often get good rockers high 3s to low 4s on the hp sounds right

 

F

fastcoupe68

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Mar 10, 2004

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nj

Mar 10, 2004

#13

• Mar 10, 2004

• #13

go with 1 3/4 headers hooker super comps

 

taylor4g63

Founding Member

May 6, 2002

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Asheboro, NC

Mar 10, 2004

#14

• Mar 10, 2004

• #14

hey a bit OT but heres something you should probably know. I was reading online earlier this week about g force transmissions. Turns out on more than one situation, some guys have broke their gforce trannys and then gforce basically told them to f themselves, wouldn't give any support to them. Its ironic because in one specific incident, a guy ran a stock t5 for a good while, then decided to swap in the gforce. Within the first couple runs it craps out on him. I can dig up the link if you would like to read about it. Just a heads up for you, hate for ya to spend all that $$ on a tranny then get screwed over.

oh and i'd say 425hp witha good tune.

 

69'Elvira

Founding Member

Sep 3, 2002

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Plano, Texas

Mar 11, 2004

#15

• Mar 11, 2004

• #15

wickedmach1 said:

Rebuilding my '69 351w from the parts listed below. Please let me know what you guys think this engine will make in terms of HP and torque at the flywheel. I appreciate everyones help on my past posts to put these parts together. If anyone sees areas that need improvement or overkill, please let me know. Thanks.

'69 351w block bored .030 over
stock stroked crankshaft (3.50 inches)
AFR 185 Cylinder Heads
Speed Pro Forged .030 pistons 9.5:1 compression
Scat 4340 Forged Steel H-Beam Rods
Edelbrock Performer RPM (Ports matched to heads)
Street Demon 750 (mechanical secondaries)
140 gph Electric Fuel Pump
Shaker Ram Air (aftermarket 100% ambient air)
Melling standard volume oil pump
1 5/8 Hedman Ceramic coated shorty headers (1 3/4 ????)
Electric Fan (don't know which one I will use)
March under-drive pulley set
MSD Pro Billet Distributor
CompCams camshaft 35-000-8RF (roller retrofit)
duration @ .050" = 224/232
valve lift w/ 1.6 rocker = .555/.565
Lobe sep. angle = 110
(I need to find out valve overlap???)

Click to expand...

Simillar setup that mine in Elvira 416 HPFW

 

W

wickedmach1

New Member

Apr 8, 2003

376

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Austin, TX

Mar 11, 2004

#16

• Mar 11, 2004

• #16

Thanks for the heads up on the tranny. I would like to see the article.

 

G

GaPonyFarm

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Jan 2, 2004

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Columbus, GA

Mar 12, 2004

#17

• Mar 12, 2004

• #17

wickedmach1 said:

I am still confused on which cam to use, mech flat tappet or roller? Please help????

Click to expand...

Looks like your initial choice of the roller retrofit is a good one. Just be advised that it will change your firing order to the same as the 289/302, not the 351w.

I'm sure its in the instructions someplace, but I missed it and spent a couple of days scratching my head, using lots of 4-letter words, and burning spots on my ceiling, while figuring that one out!

 

SadbutTrue

Founding Member

May 1, 2002

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Granada Hills, California

Mar 12, 2004

#18

• Mar 12, 2004

• #18

Definitely go with the 1 3/4 headers. ANd as far as the transmission goes... the only times I can think a Gforce T5 would be better than a Tremec TKO is when you'd have to cut up the car to get the TKO in (like on a 65-66). I believe you can cram a TKO into a 70 without cutting, so I'd go that route. It might be cheaper too, and would probably be stronger.

 

KillerKittyCat

New Member

Aug 24, 2003

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Hammer Down - Behind The Wheel

Mar 12, 2004

#19

• Mar 12, 2004

• #19

Your setup is much like mine on my convertible 69 Cougar. 351 W 10/1 750 Holley DP with 2.73 gears made 467 HP. Problem was the FMX tranny I had.
I would also suggest you forget the underdrive system.