Blown

whitefox89 · November 23rd, 2007, 03:49 PM

which block would be a better power plant turbos? roller 351 or roller 302, i want to stroke both so either a 342 or 408. i know the 408 would make more power and tq. but will a mid 90's roller 351 hold up to much power? if so, how much? i'd like to push it to a safe limit but i need to know where that line is at. and no... i dont want n/a. thanks for any help

**Chris** · November 23rd, 2007, 04:06 PM

Stroked 351W FTW.

You'll have better luck with an aftermarket block, like a Dart Iron Eagle or a FRPP Sportsman block. But, if it's a stock block (2 bolt mains) make sure you spend the extra $$ for a girder.

You can see huge power #'s with boost... just make sure the rest of your drivetrain is up to the task.

whitefox89 · November 23rd, 2007, 04:56 PM

everything will be set. i know what im doing... but i just wont have the extra $ for an aftermarket block right off. i plan on a main girdle and other upgrade.. just wanted to know if a 351 block would hold more power then the 302.

**Chris** · November 23rd, 2007, 05:17 PM

Originally Posted by whitefox89

just wanted to know if a 351 block would hold more power then the 302.

Yes, it will. Not only hold more power, but it will make more power simply because of the extra displacement.

whitefox89 · November 23rd, 2007, 07:19 PM

i know you cant give an exact amount.. but what kind of power are the windsor blocks ""guestimated"" to hold if i have a stout set of internals, crank, and motor work including stiffening it all up and balancing. i want to know what i should shoot for with a stock block. thanks

Iownastang · November 23rd, 2007, 07:36 PM

i think its suppose to be somewhere around 700 at the flywheel

ryans88gt · November 24th, 2007, 12:04 AM

The late model F4 blocks aren't that strong. I definitely wouldn't be putting the boost to them in 408 form, think...a well prepped 408 will be making between 500-600 hp, add 8 lbs of boost and you are already well over what the stock block can handle (750-900 hp). At the very least get a early 70s non-roller block and put the $500 retrofit roller lifters in it, or any solid roller, or you can get a small base circle roller cam and use the late model roller lifters. The newer blocks have less material in the main webbing area and are more prone to cracking in those areas, but yes they are much stronger than a 302 still.

Speedstang302 · November 24th, 2007, 12:21 AM

there right and wrong...the 351w would be cheapest and most practial way to go...but there is another way...you could go with an boss, dart or world 302 block, stroke it out, put on an single/twin turbo...but again "theres no replacement for displacement"

JBIGBOOTSY · November 24th, 2007, 12:01 PM

Originally Posted by ryans88gt

The late model F4 blocks aren't that strong. I definitely wouldn't be putting the boost to them in 408 form, think...a well prepped 408 will be making between 500-600 hp, add 8 lbs of boost and you are already well over what the stock block can handle (750-900 hp). At the very least get a early 70s non-roller block and put the $500 retrofit roller lifters in it, or any solid roller, or you can get a small base circle roller cam and use the late model roller lifters. The newer blocks have less material in the main webbing area and are more prone to cracking in those areas, but yes they are much stronger than a 302 still.

Correct, but you have to be careful. Pre-72 351s are missing the extra .020 on the deck that the post 71 blocks have. You cant square them, or mill them at all. they are way stronger

baine21225 · November 24th, 2007, 04:35 PM

ryan and speedstang and boosty got it right, not much left to say except i may wait until you have enough $$ for an aftermarket block, then you wont be limited

whitefox89 · November 24th, 2007, 04:56 PM

its not that im worried about being limited. im looking for 550-600 boosted hp. just a preference with my budget. i currently have a 69 351 block in the car so im not sure... i may use it. i just figured i could sell it as is, and buy another cheap block instead of having extra internals laying around.

baine21225 · November 24th, 2007, 05:13 PM

well the 69 block is going to be stronger than a mid 90's one

whitefox89 · November 24th, 2007, 05:20 PM

alright then, i'll probably save some $ and use what i got for block.

Stangzilla · November 24th, 2007, 07:38 PM

Originally Posted by whitefox89

which block would be a better power plant turbos? roller 351 or roller 302, i want to stroke both so either a 342 or 408. i know the 408 would make more power and tq. but will a mid 90's roller 351 hold up to much power? if so, how much? i'd like to push it to a safe limit but i need to know where that line is at. and no... i dont want n/a. thanks for any help

Stock 302 blocks dont like much over 500hp. You can run more but 6-700hp you will be runnin on borrowed time. Just so you know a stud girdle does very-very little in helping block strength. They are designed to keep the motor internals intacted in the block if you have a major failure. And you will have a major failure sooner or l8tr if you try to pump 600+hp through a stock 302 block..

Stangzilla · November 24th, 2007, 07:41 PM

Originally Posted by Speedstang302

there right and wrong...the 351w would be cheapest and most practial way to go...but there is another way...you could go with an boss, dart or world 302 block, stroke it out, put on an single/twin turbo...but again "theres no replacement for displacement"

I beg to differ on that one, in some cases.. The no replacement for displacement part..

Speedstang302 · November 24th, 2007, 09:45 PM

well more cubic inches = more hp...but there are some advantage's of building that smaller cubic inch motor...but you couldnt compare an N/A built small block stroker to an built big block stroker..those extra CI is just making it a beast...but you're are right..in some cases...

baine21225 · November 25th, 2007, 01:01 AM

so he should just go with his 351

whitefox89 · November 25th, 2007, 08:42 PM

thats what i plan to do... where can i find a turbo kit for a carb. setup.

November 23rd, 2007, 03:49 PM	#1
whitefox89 Enthusiast Join Date: Oct 2007 Posts: 525 iTrader: 0 reviews	Blown which block would be a better power plant turbos? roller 351 or roller 302, i want to stroke both so either a 342 or 408. i know the 408 would make more power and tq. but will a mid 90's roller 351 hold up to much power? if so, how much? i'd like to push it to a safe limit but i need to know where that line is at. and no... i dont want n/a. thanks for any help

November 23rd, 2007, 04:06 PM	#2
Chris Regular 1989 LX Coupe Join Date: Oct 2007 Location: St. Pete, Fl Posts: 377 iTrader: 0 reviews	Stroked 351W FTW. You'll have better luck with an aftermarket block, like a Dart Iron Eagle or a FRPP Sportsman block. But, if it's a stock block (2 bolt mains) make sure you spend the extra $$ for a girder. You can see huge power #'s with boost... just make sure the rest of your drivetrain is up to the task. __________________ 7.87 @ 93 mph http://www.youtube.com/watch?v=ZwEEQUYY8gA

November 23rd, 2007, 07:36 PM	#6
Iownastang I Post Entirely Way Too Much 1987 ford mustang gt well see when shes done Join Date: May 2007 Location: mascot, tn Posts: 5,020 iTrader: 0 reviews	i think its suppose to be somewhere around 700 at the flywheel __________________ 2004 tahoe z71 Daily 2004 BBM Gto ls1 6 speed 57,000 miles 1987 mustang hatch,347,world heads,systemax, kooks lts,nitrous, 6 point cage, team z front and rear suspension,8.8, 4.10s, 31 splines strange axles,wilwood brakes, tko600

November 24th, 2007, 12:04 AM	#7
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	The late model F4 blocks aren't that strong. I definitely wouldn't be putting the boost to them in 408 form, think...a well prepped 408 will be making between 500-600 hp, add 8 lbs of boost and you are already well over what the stock block can handle (750-900 hp). At the very least get a early 70s non-roller block and put the $500 retrofit roller lifters in it, or any solid roller, or you can get a small base circle roller cam and use the late model roller lifters. The newer blocks have less material in the main webbing area and are more prone to cracking in those areas, but yes they are much stronger than a 302 still. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

November 24th, 2007, 12:21 AM	#8
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,828 iTrader: 1 reviews	there right and wrong...the 351w would be cheapest and most practial way to go...but there is another way...you could go with an boss, dart or world 302 block, stroke it out, put on an single/twin turbo...but again "theres no replacement for displacement" __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

November 23rd, 2007, 04:56 PM	#3
whitefox89 Enthusiast Join Date: Oct 2007 Posts: 525 iTrader: 0 reviews	everything will be set. i know what im doing... but i just wont have the extra $ for an aftermarket block right off. i plan on a main girdle and other upgrade.. just wanted to know if a 351 block would hold more power then the 302.

November 23rd, 2007, 07:19 PM	#5
whitefox89 Enthusiast Join Date: Oct 2007 Posts: 525 iTrader: 0 reviews	i know you cant give an exact amount.. but what kind of power are the windsor blocks ""guestimated"" to hold if i have a stout set of internals, crank, and motor work including stiffening it all up and balancing. i want to know what i should shoot for with a stock block. thanks

November 24th, 2007, 04:35 PM	#10
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	ryan and speedstang and boosty got it right, not much left to say except i may wait until you have enough $$ for an aftermarket block, then you wont be limited

November 24th, 2007, 04:56 PM	#11
whitefox89 Enthusiast Join Date: Oct 2007 Posts: 525 iTrader: 0 reviews	its not that im worried about being limited. im looking for 550-600 boosted hp. just a preference with my budget. i currently have a 69 351 block in the car so im not sure... i may use it. i just figured i could sell it as is, and buy another cheap block instead of having extra internals laying around.

November 24th, 2007, 05:13 PM	#12
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	well the 69 block is going to be stronger than a mid 90's one

November 24th, 2007, 05:20 PM	#13
whitefox89 Enthusiast Join Date: Oct 2007 Posts: 525 iTrader: 0 reviews	alright then, i'll probably save some $ and use what i got for block.

November 24th, 2007, 09:45 PM	#16
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,828 iTrader: 1 reviews	well more cubic inches = more hp...but there are some advantage's of building that smaller cubic inch motor...but you couldnt compare an N/A built small block stroker to an built big block stroker..those extra CI is just making it a beast...but you're are right..in some cases... __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

November 25th, 2007, 01:01 AM	#17
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,349 iTrader: 1 reviews	so he should just go with his 351

November 25th, 2007, 08:42 PM	#18
whitefox89 Enthusiast Join Date: Oct 2007 Posts: 525 iTrader: 0 reviews	thats what i plan to do... where can i find a turbo kit for a carb. setup.

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