Best Size BBF Stroker???

Go down

Best Size BBF Stroker???

Post  514F-1 on February 14th 2014, 6:25 pm

Just wondering what the experts feel is the best STOCK BLOCK BBF Stroker size? I have heard that the 4.300 stroke 514/521 combos are probably the best, just curious to see what others think Very Happy 
avatar
514F-1

Posts : 242
Join date : 2013-08-06
Age : 29
Location : Plant City FL

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  514Fox87 on February 14th 2014, 6:44 pm

Personally if I were buying a stroker my money goes into a 4.500 arm. Just my 2 cents.
avatar
514Fox87

Posts : 436
Join date : 2009-08-08
Age : 52
Location : Harrington DE

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  dfree383 on February 14th 2014, 6:47 pm

Depends on the top end and the application IMO
avatar
dfree383
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 14027
Join date : 2009-07-09
Location : Home Wif Da Wife.....

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Lem Evans on February 14th 2014, 6:55 pm

Yep, application and which cyl. heads would matter.

Lem Evans

Posts : 7043
Join date : 2008-12-03
Location : Livermore , Ky

View user profile http://bfevansraceparts.com

Back to top Go down

Re: Best Size BBF Stroker???

Post  quick 52 on February 14th 2014, 7:09 pm

Can more stroke hurt

quick 52

Posts : 612
Join date : 2011-01-14
Age : 67
Location : leonard mi.

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Lem Evans on February 14th 2014, 7:25 pm

I wouldn't use the word 'hurt' but, I can think of a few applications where I'd rather have a 533" [4.440" x 4.300"] than a 545" [4.390" x 4.500"]. It'd depend on the cyl. head/valve size and rpm range needed.

Lem Evans

Posts : 7043
Join date : 2008-12-03
Location : Livermore , Ky

View user profile http://bfevansraceparts.com

Back to top Go down

Re: Best Size BBF Stroker???

Post  rmcomprandy on February 14th 2014, 8:22 pm

dfree383 wrote: Depends on the top end and the application IMO

YEP ... the top end will determine the best bottom end for the application.

rmcomprandy

Posts : 5020
Join date : 2008-12-02
Location : Roseville, Michigan

View user profile http://www.rmcompetition.com

Back to top Go down

Re: Best Size BBF Stroker???

Post  windsor on February 14th 2014, 9:38 pm

4.68 bore but pump gas and "street friendly" cam for drag week style build????
avatar
windsor

Posts : 1116
Join date : 2009-08-09
Location : St. Pete/Northern Va.

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  cool40 on February 14th 2014, 9:58 pm

In a 2 bolt block i'd stay 4.3.IMO.....for sure if its a race motor.
avatar
cool40
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 7135
Join date : 2009-08-31
Age : 47
Location : on the 1/8 mile dyno

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Larry Williams on February 14th 2014, 11:11 pm

what would be considered the best size for the P51 heads as out of the box?


avatar
Larry Williams

Posts : 884
Join date : 2009-08-08
Age : 73
Location : Wallacetown Ontario

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  c.evans on February 15th 2014, 1:10 am

Larry Williams wrote:what would be considered the best size for the P51 heads  as out of the box?



I'd say something like a 533 / 545 CID for out of the box. But why? Why not just go ahead and do some porting and flow testing work, and then they can be used on anything up into the 557 / 572 CID range.

For example Bobby Shrewsberry's 557 made 942 Hp and he won the Ford Bash that year in his dragster. Randy Moore's 562 made 951 Hp and won a lot of races. Blake da Snake's 588 makes 1003 Hp and runs dang good.

Hope this helps,
Charlie

c.evans
BBF VENDOR SPONSOR
BBF VENDOR SPONSOR

Posts : 2208
Join date : 2008-12-03

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Larry Williams on February 15th 2014, 1:22 am

c.evans wrote:
Larry Williams wrote:what would be considered the best size for the P51 heads  as out of the box?



I'd say something like a 533 / 545 CID for out of the box.  But why?  Why not just go ahead and do some porting and flow testing work, and then they can be used on anything up into the 557 / 572 CID range.

For example Bobby Shrewsberry's 557 made 942 Hp and he won the Ford Bash that year in his dragster.  Randy Moore's 562 made 951 Hp and won a lot of races.  Blake da Snake's 588 makes 1003 Hp and runs dang good.

Hope this helps,
Charlie


i have them sitting on a 545 in the garage now. I should have taken them with me 2 years ago for you. now its a spare motor till I get to Ky with my bigger motor for repairs.

thanks for the input Charlie
avatar
Larry Williams

Posts : 884
Join date : 2009-08-08
Age : 73
Location : Wallacetown Ontario

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  LivermoreDave on February 15th 2014, 5:16 pm

A question if I may? Using factory blocks, will the longer stroke (4.5") interfere with longer cylinder barrels and with the longer stroke (4.5") is there enough cylinder (shorter cylinder barrels) to stabilize the piston at BDC?

Dave.

LivermoreDave

Posts : 972
Join date : 2009-09-27
Location : North of the Equator.

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  rmcomprandy on February 15th 2014, 8:25 pm

LivermoreDave wrote:A question if I may? Using factory blocks, will the longer stroke (4.5") interfere with longer cylinder barrels and with the longer stroke (4.5") is there enough cylinder (shorter cylinder barrels) to stabilize the piston at BDC?

Dave.

There are no interference problems with any factory blocks with a 4.5" stroke using a rod having a capscrew type bolt..
With a rod having a through bolt, the bolt head will slightly interfere with a later longer cylinder bore block.

rmcomprandy

Posts : 5020
Join date : 2008-12-02
Location : Roseville, Michigan

View user profile http://www.rmcompetition.com

Back to top Go down

Re: Best Size BBF Stroker???

Post  powerstrokeace on February 15th 2014, 10:14 pm

c.evans wrote:
Larry Williams wrote:what would be considered the best size for the P51 heads  as out of the box?



I'd say something like a 533 / 545 CID for out of the box.  But why?  Why not just go ahead and do some porting and flow testing work, and then they can be used on anything up into the 557 / 572 CID range.

For example Bobby Shrewsberry's 557 made 942 Hp and he won the Ford Bash that year in his dragster.  Randy Moore's 562 made 951 Hp and won a lot of races.  Blake da Snake's 588 makes 1003 Hp and runs dang good.

Hope this helps,
Charlie


Charlie? What heads were on these 3 motors you speak of?

Ace
avatar
powerstrokeace

Posts : 1492
Join date : 2009-09-07
Location : colorado

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  dfree383 on February 15th 2014, 10:29 pm

Did 870hp on this years 572 EMC engine with P-51s. Hot street setup with a hydraulic roller 11.4:1 and a 4150 carb
avatar
dfree383
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 14027
Join date : 2009-07-09
Location : Home Wif Da Wife.....

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  c.evans on February 15th 2014, 11:09 pm

powerstrokeace wrote:
c.evans wrote:
Larry Williams wrote:what would be considered the best size for the P51 heads  as out of the box?



I'd say something like a 533 / 545 CID for out of the box.  But why?  Why not just go ahead and do some porting and flow testing work, and then they can be used on anything up into the 557 / 572 CID range.

For example Bobby Shrewsberry's 557 made 942 Hp and he won the Ford Bash that year in his dragster.  Randy Moore's 562 made 951 Hp and won a lot of races.  Blake da Snake's 588 makes 1003 Hp and runs dang good.

Hope this helps,
Charlie


Charlie? What heads were on these 3 motors you speak of?

Ace

Fully ported and flowed P-51 heads on those three engines. It was in response to Larry's question.

Then Dave mentioned that his P-51 headed 2012 EMC contest engine was 572 CID and made 870 Hp. Again those were fully ported and flowed P-51 heads. I put the bigger 2.300" intake valve in them.

Charlie


c.evans
BBF VENDOR SPONSOR
BBF VENDOR SPONSOR

Posts : 2208
Join date : 2008-12-03

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  powerstrokeace on February 16th 2014, 2:07 am

Thanks Charlie. I just did a 557 a460 head deal. Waiting on a cam right now



Ace
avatar
powerstrokeace

Posts : 1492
Join date : 2009-09-07
Location : colorado

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Frank Merkl on February 16th 2014, 3:11 am

From what motors I built you can not go wrong with a 4.500" stroke with a 6.800 rod even in a short wall Dive block, 4.390 bore even with ported D3 heads are torque monsters ,ie 450- 500 ft/tq @ 2200 rpm or less
Frank
avatar
Frank Merkl

Posts : 1401
Join date : 2008-12-17
Age : 62
Location : Brooks ,Alberta ,Canada

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Rickyt630x on February 16th 2014, 7:47 pm

combos i found work best were 4.44 bore 4.150 stroke, (514) 4.390 with a 4.500 stroke (545 or the 4.44 bore with 4.500 stroke (557) and a 4.42 with 4.500 (552). we've used all these combos and work great.

Rickyt630x

Posts : 71
Join date : 2014-01-25

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  Rickyt630x on February 16th 2014, 7:49 pm

cool40 wrote:In a 2 bolt block i'd stay 4.3.IMO.....for sure if its a race motor.

why say that? its not a bowtie dont need the 4 bolts to make the power lol Very Happy 

Rickyt630x

Posts : 71
Join date : 2014-01-25

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  cool40 on February 16th 2014, 10:04 pm

Rickyt630x wrote:
cool40 wrote:In a 2 bolt block i'd stay 4.3.IMO.....for sure if its a race motor.

why say that? its not a bowtie dont need the 4 bolts to make the power lol Very Happy 
for a race motor 4 bolts are better than 2. my 2 bolt d0ve block had a little cap walk but held up fine. i guess i should have said UNDER 7000 RPM.  Very Happy 
avatar
cool40
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 7135
Join date : 2009-08-31
Age : 47
Location : on the 1/8 mile dyno

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  CDMBill on February 18th 2014, 1:08 am

Even good stock block should be 4.5". Are you going to cam it enough to turn it high enough to matter? DW deal spends 99% of the time at idle to light load cruise. The length of the arm doesn't matter for that. Other than a high rpm deal the side load concerns are not a huge deal. Trying to spin it brings a bunch of concerns with valve train parts.

CDMBill

Posts : 168
Join date : 2010-08-09

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  supervel45 on February 18th 2014, 2:01 am

cool40 wrote:
Rickyt630x wrote:
cool40 wrote:In a 2 bolt block i'd stay 4.3.IMO.....for sure if its a race motor.

why say that? its not a bowtie dont need the 4 bolts to make the power lol Very Happy 
for a race motor 4 bolts are better than 2. my 2 bolt d0ve block had a little cap walk but held up fine. i guess i should have said UNDER 7000 RPM.  Very Happy 
                                                                                                                           I have a Question, Cool40 has a good point. I have not seen cranksfaft balance mentioned yet. If an engine was to operate at 5-8500RPM, would it need to be balanced in this range, and not at a lower RPM level range?

supervel45

Posts : 3070
Join date : 2013-09-04

View user profile

Back to top Go down

Re: Best Size BBF Stroker???

Post  supervel45 on February 18th 2014, 2:14 am


supervel45

Posts : 3070
Join date : 2013-09-04

View user profile

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum