Welcome, Guest. Please login or register.
September 21, 2018, 02:36:45 pm

Login with username, password and session length
435265 Posts in 37271 Topics by 9537 Members
Latest Member: Mgabski
Search: Advanced search
Advertiser Inquiries
+ My Community
|-+ Small Block Talk
| |-+ Small Block Windsors
| | |-+ 289 Small Blocks
| | | |-+ 302 block HP
0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: 302 block HP  (Read 9907 times)
murphy88
Small Block
***
Offline Offline

Posts: 115

Location: waterloo ontario

« on: October 22, 2014, 06:23:42 pm »

i have a 1969  302 block.. i might put a 3.25 stroke crank in it,,,how much power can i make before i will split it in lifter valley ???
Logged
scienceguy
Big Block
*****
Offline Offline

Posts: 2453


Location: West Virginia

« Reply #1 on: October 22, 2014, 07:02:37 pm »

Could be 400.  Could be 650+.

All depends upon if you run it into detonation or not.  If you run it into detonation at higher power levels, it puts an incredible strain on the block, and it splits.  If you run a conservative tune and compression ratio, the block will be more resistant to detonating, and will generally last a LOT longer. 

A person should also not run the engine at max power unless it is at a COLD operating temperature, as engine heat also spurs detonation.  Cold plugs and good fuel area also mandatory when pushing things. 

I do all of the above, and have been pushing 625-650hp out of mine with a 3.00" stroke and a 200hp nitrous plate.  It is a Mexican block. (same as your 1969 302, but with non-tapered main caps) and has old school Boss 302 rods and crank...  but my old block used with the ported 289 heads was a 1969 302 unit, and withstood around 550hp or so for around a dozen years before it got retired...  and never split. 

Moral of the story...  be CAREFUL, run a conservative tune, and do everything you can to keep it out of detonation.  Some people could break a bowling ball in a sand box with their bare hands.  If that is you, it's probably not a good idea to push a stock block all that hard.  Smiley

Good Luck!
Logged

1966 Mustang, Toploader 4-speed
Pump Gas, Flat Tappet 306
9.88 @ 135.67
Outlaw Bill
Adv_SBFTechie
Big Block
****
Offline Offline

Posts: 4760


Location: Canton, Michigan

« Reply #2 on: October 22, 2014, 09:06:47 pm »

The type of balance makes a huge difference, the stock late model 5.0L 50oz imbalance is a huge factor in stock block deaths. Most 302's that live with high horsepower are the early 28oz or neutral balance. Keeping the rotating assembly light is important.
Logged

www.TeamZmotorsports.net

TeamZmotorsports 25.2 outlaw drag radial stock suspension 1991 Mustang
Thank You to the following for their help
TeamZmotorsports
Marcella Manifolds
Schoneck Composite
Ultimate Converter Concepts


"Stupid is as stupid does", "You can't fix stupid"
"Common sense is not common"
wywindsor
Big Block
*****
Offline Offline

Posts: 1544


Location: casper wyoming

« Reply #3 on: October 22, 2014, 10:51:34 pm »

Also use good fasteners. ARP is a good one. Studs are preferred over bolts. Cap walk will kill your engine.
Logged
289nate
"IL BUONO"
Global Moderator
Big Block
*****
Offline Offline

Posts: 11467


Location: Los Angeles

« Reply #4 on: October 22, 2014, 11:03:57 pm »

What are you looking to do with the engine? 
Logged

\'65 fastback pump gas 289, 4.56 gears, and faceplated T5.  11.123 at 122.4
murphy88
Small Block
***
Offline Offline

Posts: 115

Location: waterloo ontario

« Reply #5 on: October 23, 2014, 08:43:42 am »

Thanks gor info guys....a guy at the track was running 10 .90 in his maverick ..he split his block...it was a 347 with 205 heads.....ok i have a 347 eagle kit with flat top pistons....it is in a svo block..2 bolt main...i never put heads on it just wanted to make sure all is good
Logged
murphy88
Small Block
***
Offline Offline

Posts: 115

Location: waterloo ontario

« Reply #6 on: October 23, 2014, 08:48:45 am »

I also have a 69  302 block....i picked up a crank from a  ex drag racer in detroit...the svo  3.2 stroke crank..internally balanced weighs about 44 pounds...i was think ing of using this combo  together
Logged
al2
Big Block
*****
Offline Offline

Posts: 1720


Location: fort worth,tx.

« Reply #7 on: October 23, 2014, 08:49:43 am »

I would want at least 28oz balance and keep rpm down
Logged
347HO
A-1 Super Genious / Director of Maintenance
Section Moderator
Big Block
****
Offline Offline

Posts: 12850


Location: Seattle, Washington
I believe they landed on the moon.


« Reply #8 on: October 23, 2014, 09:50:40 am »

I would want at least 28oz balance and keep rpm down
This ^
and take weight out of your chassis.
Logged




... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
Javier
Ugly?  Easy now -- that's my baby and it's got lots of unique character!  When I drop that built 445" stroker in it you won't have any time to "pull over to let me pass" because I'll have already blown past you when you figure out what the hell was that loud noise behind you . . .  
289nate
"IL BUONO"
Global Moderator
Big Block
*****
Offline Offline

Posts: 11467


Location: Los Angeles

« Reply #9 on: October 23, 2014, 10:38:09 am »

So you currently have the 347 kit in a Motorsport B50 two bolt main block?  If so, it is a little stronger than a '69 302. 

What others have said is good advice.  Just don't go listening to some turbo guy who is making some absurd number with a stock block and think you can do the same naturally aspirated or with a supercharger.  Their applications are usually very low rpm and there is no belt pulling on the snout of the crank like a supercharged build. 

Logged

\'65 fastback pump gas 289, 4.56 gears, and faceplated T5.  11.123 at 122.4
Thumper460
Big Block
*****
Offline Offline

Posts: 1123

Location: Orange Park Fl

« Reply #10 on: November 24, 2014, 10:06:45 am »

So you currently have the 347 kit in a Motorsport B50 two bolt main block?  If so, it is a little stronger than a '69 302. 

What others have said is good advice.  Just don't go listening to some turbo guy who is making some absurd number with a stock block and think you can do the same naturally aspirated or with a supercharger.  Their applications are usually very low rpm and there is no belt pulling on the snout of the crank like a supercharged build. 



What HE said !! ^^

The 69 block will take a LOT of abuse.  Up to a 74 Block.  We have always used 'road tested' parts.  We have used the early 302 crank ( 2m - 2ma), have it polished and mic'd.  ARP bolts and Main griddle,
I have been twisting Carb engines to 7500 since the 70's ( 11.5: 1 Comp)  Then over the years, 250 NOS , 7500 rpm and these little blocks still hang in there. 
Grandson has a 74 block/2M crank/H-Beams/11.5: 1 in a 92 fox.. 9.90ET on 200 shot. 

But just be aware of the limits and don't get nutz.. yes??

Thumper
Logged

Thumper Heads
" heads winner on PINKS 07-12 "
67 Fastback Mustang ( original owner) bored and stroked 460....  SOLD!  Long rod 302 now working.  5.4 rods BRC Pistons, 2MA 3.00 inch crankshaft... oh and dual quads. Aussie 2V Heads and a BOAT Load of Nitrous!!
Working on Mexican Block 363 CI .  Old School for an OLD Gearhead.

When you are too OLD to shift a 4 spd... get out!!
murphy88
Small Block
***
Offline Offline

Posts: 115

Location: waterloo ontario

« Reply #11 on: February 05, 2015, 04:57:11 pm »

For my Svo 2 bolt main block can I just use stock roller lifters in it??  I was thinking around 520 lift..how hi can I rev it???
Logged
Thumper460
Big Block
*****
Offline Offline

Posts: 1123

Location: Orange Park Fl

« Reply #12 on: February 06, 2015, 08:48:48 am »

For my Svo 2 bolt main block can I just use stock roller lifters in it??  I was thinking around 520 lift..how hi can I rev it???

Stock Ford Rollers are what we used to call 'anti-pump up' !!  they will hold a lot of RPM !!  The issue is they are about 2 tons in weight, and slinging them around will take a lot of spring pressure, and that takes away a lot of HP !!  Try keeping those heavy rollers down to 6500 rpm , cool??

Just a note here... there are racers that pull the Heavy Hyd rollers and use the light weight Solid Rollers !!  Usually they set the lash at .008 or .010 , and then they twist the crap out of it.  BUT.. they have to be adjusted, and you do have all that manifold over hanging... !!

Thumper
Logged

Thumper Heads
" heads winner on PINKS 07-12 "
67 Fastback Mustang ( original owner) bored and stroked 460....  SOLD!  Long rod 302 now working.  5.4 rods BRC Pistons, 2MA 3.00 inch crankshaft... oh and dual quads. Aussie 2V Heads and a BOAT Load of Nitrous!!
Working on Mexican Block 363 CI .  Old School for an OLD Gearhead.

When you are too OLD to shift a 4 spd... get out!!
murphy88
Small Block
***
Offline Offline

Posts: 115

Location: waterloo ontario

« Reply #13 on: February 06, 2015, 07:34:38 pm »

That sounds good to get a solid roller cam with light solid roller lifters...can i buy s used set ??  They dont wear  much...not sure what you meant by manifold
Logged
mighty mouse
"Prom King Mista Nathan Moonen"
Administrator
Big Block
*****
Offline Offline

Posts: 12781


Location: Decorah, Iowa
I'll be the Judge of that


« Reply #14 on: February 06, 2015, 10:13:04 pm »

He means on most efi ford cars there is a giant upper intake overhang the valve covers. Which you usually have to pull in order to adjust the valves. ..which is kind of a pain in the arse.
Logged

1986 Mustang GT Convertible
Suspension and Differential by Team Z Motorsports
9.5 Deck Forged Stroker Shortblock by FordStrokers
Trick Flow High Ports and Super Vic EFI intake by Duane Busch

I'd rather be a fool who is loyal to his friends than a POS that jumps ship to save face. We were wrong in the end, but nobody can ever call us disloyal. I can live with that.
Pages: [1] Go Up Print 
« previous next »
Jump to:  



Powered by MySQL Powered by PHP Valid XHTML 1.0! Valid CSS!
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines



408 Stroker