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Old 06-05-2017, 04:29 PM
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why 3.92? I am sure it isn't what you had laying around...
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Old 06-05-2017, 04:45 PM
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Originally Posted by dereknkathy
why 3.92? I am sure it isn't what you had laying around...
I bought an Ilmor supercat spec engine. It came with a 4000 dollar crank and Carrillo rods with CARR bolts.
At that point, I built the engine around the block, crank and rods I had.

I worked woth CP on a set of pistons with the proper compression height as the supercat pistons had a good sized dome on them. (Something like 12.5:1 CR)

ilmor or had those cranks made in the oddball 3.920" size in part so they could run a larger bore and still make the 510CI spec. That's what I was told by someone familiar with the program back in the early 2000's when they were doing supercat stuff.
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Old 06-06-2017, 07:38 AM
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Now to find out if my cylinder heads will support the overall power output that I desire. I know they flow pretty good to .600" shouldn't have to lift much more than that. Current cams lift to .598" and .610". Who would be a good choice for doing a valve job on my merlin 3's and mild porting? Thanks for all the input guys, as always it is greatly appreciated!
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Old 06-06-2017, 08:00 AM
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Originally Posted by TylerBurich
Now to find out if my cylinder heads will support the overall power output that I desire. I know they flow pretty good to .600" shouldn't have to lift much more than that. Current cams lift to .598" and .610". Who would be a good choice for doing a valve job on my merlin 3's and mild porting? Thanks for all the input guys, as always it is greatly appreciated!
I got a good head guy for you if you dont mind driving up this way.
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Old 06-06-2017, 08:26 AM
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Originally Posted by MILD THUNDER
I got a good head guy for you if you dont mind driving up this way.
Sweet! I bought all my stuff from Teague over 5 years ago, coming up on 200 hrs of run time now with no problems whatsoever. We can just call this SecretFormula repower 2.0.
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Old 06-07-2017, 05:22 PM
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"If" I go the solid roller route looking at crane stock grinds. Part #138781 246/254 on a 114 with .615"/.636" looks good. I like that for the duration it has it doesn't lift a ton so should be easy on valve train.
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Old 11-01-2017, 07:50 AM
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Scrapped this build after pricing oiling system and exhaust for TRS capable of 6500 rpm..Gonna stick with the imco's and stock style oil system and keep the revs below 5500.
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Old 11-01-2017, 11:06 AM
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Originally Posted by TylerBurich
Beginning to plan out my next engine build for the ol' Formula. Currently have 454's with 500efi cams. Wanting to build a 500+ cubic inch short block to use with my current 310 Merlin aluminum heads. 600hp goal with longevity and reliability in mind. SRP has a piston for 4.560" bore that I could use with new blocks and a 6.385" rod. That makes a 523cid. Does anyone have anything similar with a 310cc cylinder head? Toying around with the idea of a Solid roller cam as well.
tyler,a 509 [4.500 bore 4.000 stroke]a crane 168741 hyd roller cam and your heads will exceed 600 hp.i just finished the same combination but it has a set of the engine quest heads.it is going to the dyno next week,i will post the results but i am expecting 625 + or - 10.
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Old 11-02-2017, 07:38 AM
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Originally Posted by mike tkach
tyler,a 509 [4.500 bore 4.000 stroke]a crane 168741 hyd roller cam and your heads will exceed 600 hp.i just finished the same combination but it has a set of the engine quest heads.it is going to the dyno next week,i will post the results but i am expecting 625 + or - 10.
Mike, would there be any reason not to use a little more bore with 4" stroke if using the world blocks? I'm a big fan of the 4" stroke in a 9.8" deck block. Thanks for your input!
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Old 11-02-2017, 07:56 AM
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Originally Posted by TylerBurich
Beginning to plan out my next engine build for the ol' Formula. Currently have 454's with 500efi cams. Wanting to build a 500+ cubic inch short block to use with my current 310 Merlin aluminum heads. 600hp goal with longevity and reliability in mind. SRP has a piston for 4.560" bore that I could use with new blocks and a 6.385" rod. That makes a 523cid. Does anyone have anything similar with a 310cc cylinder head? Toying around with the idea of a Solid roller cam as well.
a note of caution... bowtie or dart/merlin block if you're planning to go 4.560 most gen IV/6 blocks will not sonic test acceptable for wall thickness in a marine application I would strongly suggest sonic check of any block used over 4.530 to verify proper wall thickness, I've seen some crazy chit in my years...
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