521" pump gas engine

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Post  68galaxie on December 20th 2014, 11:40 am

Please don't ruin a great post about a very well built 521".

No one said this was BS anyhow. Great build Lem!!
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Post  jones on December 21st 2014, 10:21 pm

68galaxie wrote:Please don't ruin a great post about a very well built 521".

No one said this was BS anyhow. Great build Lem!!

This is almost identical build to my engine except my heads, intake have been ported, solid roller camshaft and 4500 carb.

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Post  nuclearcobra on January 24th 2015, 6:28 pm

droppedf100 wrote:That is badass with pump gas and a solid flat tappet. Where is the limit in a flat tappet? Could a cam be grinded to make good power with a460 heads?
Not sure where the limit is, but Lem had a pretty big solid flat tappet made for the combo i'm starting soon for a friend and said we should see 800 , these guys know these motors for sure , Scott Johnson , Roger at Kaase , Carl Hansen, Dave Freelander all said the same thing , the combo is a 14to1 552 with P51 heads and a mafia intake with a 1250 quick fuel carb , my friend knows he's leaving some good hp on the table not going the solid roller route , but he wants to try this first then maybe next season step up to a roller with some head and intake work.
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Post  IDT-572 on January 29th 2015, 1:09 pm

nuclearcobra wrote:
droppedf100 wrote:That is badass with pump gas and a solid flat tappet. Where is the limit in a flat tappet? Could a cam be grinded to make good power with a460 heads?
Not sure where the limit is, but Lem had a pretty big solid flat tappet made for the combo i'm starting soon for a friend and said we should see 800 , these guys know these motors for sure , Scott Johnson , Roger at Kaase , Carl Hansen, Dave Freelander all said the same thing , the combo is a 14to1 552 with P51 heads and a mafia intake with a 1250 quick fuel carb , my friend knows he's leaving some good hp on the table not going the solid roller route , but he wants to try this first then maybe next season step up to a roller with some head and intake work.

The P-51's are a good head candidate for a flat tappet cam too............. Your deal with the right cam will best 800 a good bit.
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Post  68galaxie on January 29th 2015, 4:45 pm

nuclearcobra wrote:
droppedf100 wrote:That is badass with pump gas and a solid flat tappet. Where is the limit in a flat tappet? Could a cam be grinded to make good power with a460 heads?
Not sure where the limit is, but Lem had a pretty big solid flat tappet made for the combo i'm starting soon for a friend and said we should see 800 , these guys know these motors for sure , Scott Johnson , Roger at Kaase , Carl Hansen, Dave Freelander all said the same thing , the combo is a 14to1 552 with P51 heads and a mafia intake with a 1250 quick fuel carb , my friend knows he's leaving some good hp on the table not going the solid roller route , but he wants to try this first then maybe next season step up to a roller with some head and intake work.


Hello Nuclear,

Is the flat tappet made for this combo using a .904" lifter? or larger?
Would be very interesting to see the limit of a solid ft cam - with larger lifter diameters.
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Post  460bronco on January 30th 2015, 6:07 pm

How ported are the heads? Care to share any flow numbers? Also what ball park duration does the cam have?
Thanks,
Jon
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Post  nuclearcobra on January 30th 2015, 7:27 pm

Just normal size Comp edm lifters, and the heads and intake are box stock.
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Post  Lem Evans on January 30th 2015, 8:32 pm

460bronco wrote:How ported are the heads?  Care to share any flow numbers?  Also what ball park duration does the cam have?
Thanks,
Jon

This the deal for the 521" that I posted.......


The intake side of the heads are 375ish cfm. There was no intent or attempt to make a 400 cfm port. Things were size to fit the application.

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Post  rmcomprandy on May 4th 2015, 11:34 pm

Lem Evans wrote:
460bronco wrote:How ported are the heads?  Care to share any flow numbers?  Also what ball park duration does the cam have?
Thanks,
Jon

This the deal for the 521" that I posted.......


The intake side of the heads are 375ish cfm. There was no intent or attempt to make a 400 cfm port. Things were size to fit the application.

Simple bowl porting and a back-cut angle on the intake valves will get near that air flow amount with those heads so, I am sure this was nothing drastic.  

AND, peak air flow is just not the place where those SCJ heads show themselves ... .300" to .550" valve lift is where they really shine.

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Post  Lem Evans on April 19th 2016, 7:02 pm


Yearly bump.Laughing

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Post  Lem Evans on July 3rd 2016, 12:45 pm

521" pump gas engine  - Page 2 Pbucket

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Post  SandHillsHillbilly on July 3rd 2016, 1:04 pm

Nice valve covers! Wish the picture was larger. What is the engraving? Is that like decals more HP? Laughing clown
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Post  jones on July 4th 2016, 5:26 pm

Lem Evans wrote:521" pump gas engine  - Page 2 Pbucket


Laughing

One day my wife will let me finish my truck!

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Post  D. Sea on September 14th 2016, 3:49 pm

Not looking for an exact figure or a "Quote" but ball park how much would this build cost minus labor for engine assembly.

Looking at ideas for a future "Street" project.

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Post  Lem Evans on September 14th 2016, 5:41 pm

Your phone # still end in 5383?

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Post  D. Sea on September 15th 2016, 7:37 am

Lem Evans wrote:Your phone # still end in 5383?

Yassir, I have a few blocks, need to do something with them i.e. Fill the insides with rotating metal LOL! Lem this isn't something I'll get started on right away, most likely be this winter or maybe next spring before I get started. I have a few other projects going on right now that take priority.

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Post  Lem Evans on October 20th 2017, 6:04 pm

x

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Post  Lem Evans on October 20th 2017, 6:09 pm

Lem Evans wrote:521" pump gas engine  - Page 2 Pbucket

Solid flat tappet cam.


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Post  FalconEh on October 20th 2017, 9:52 pm

cheers I would like to mail you a money order for the blueprints of that build in the spring/summer for my 521 so after I get the block back from local bowtie/rat-nick machine shop I can assemble it correctly. Fire it, and have a beer or 3 (8-10) after breaking in the cam then go hunting at later dates. Great build, thanks for sharing I think I got the jist but the details are everything. Wink
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Post  J.Toney on March 13th 2018, 7:59 pm

Is it a bad internet service thing, or why is the pic in the OP missing? No picture of the pull.
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Post  Lem Evans on March 13th 2018, 8:26 pm

521" pump gas engine  - Page 2 521_pu11
521" pump gas engine  - Page 2 521_pu11

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Post  Lem Evans on March 13th 2018, 8:28 pm

J.Toney wrote:Is it a bad internet service thing, or why is the pic in the OP missing? No picture of the pull.

It's a photo bucket rape deal.........new stuff is applied

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Post  J.Toney on March 13th 2018, 8:39 pm

Thanks greybeard!! Same or similar thoughts on a SFT cam these days? Have one needing sorting of details and then assmeble. ~13:1 521 w/SCJA's. Just boxes at the moment.
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Post  Lem Evans on March 13th 2018, 8:55 pm

This deal did not have much cam. Call me.

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