Boss 545 high vacuum can for street car ?

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Boss 545 high vacuum can for street car ?

Post  mach1charlie on November 2nd 2018, 9:21 am

Building a boss 545 the question is how small . of a flat tappet cam can I get away with at 10.6 compression. Elgin 1586 s is what I'm looking at, has a lot of seat to seat timing. But at .050 shows 218 on Wallace dcr calculater.
Want to use a stock torque converter.

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Re: Boss 545 high vacuum can for street car ?

Post  gt350hr on November 2nd 2018, 1:36 pm

Use a stock converter for a mid 70's Bronco with a 351M . That is about the "loosest" stock C6 converter except for the early 351CJ 10" units that are TOO loose for your application.

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Re: Boss 545 high vacuum can for street car ?

Post  mach1charlie on November 2nd 2018, 1:54 pm

The converter is easy, the cam needs to bleed of enough compression to run on CA. 91 octane

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Re: Boss 545 high vacuum can for street car ?

Post  rmcomprandy on November 2nd 2018, 4:39 pm

mach1charlie wrote:Building a boss 545 the question is how small . of a flat tappet cam can I get away with at 10.6 compression. Elgin 1586 s is what I'm looking at, has a lot of seat to seat timing. But at .050 shows 218 on Wallace dcr calculater.
Want to use a stock torque converter.

Something custom ... about 10 more seat degrees on the intake side having only 2 more degrees at .050" with the more aggressive ramp lobe on the exhaust side.

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Re: Boss 545 high vacuum can for street car ?

Post  jasonf on November 3rd 2018, 10:06 pm

mach1charlie wrote:Building a boss 545 the question is how small . of a flat tappet cam can I get away with at 10.6 compression. Elgin 1586 s is what I'm looking at, has a lot of seat to seat timing. But at .050 shows 218 on Wallace dcr calculater.
Want to use a stock torque converter.

You built an $17k+ engine and you are going to use an Elgin camshaft??
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Re: Boss 545 high vacuum can for street car ?

Post  mach1charlie on November 3rd 2018, 11:42 pm

Well $7,700 with kasse. Scat $1900, and a $200 truck motor. I figure 12k.
Gonna put it in an old Ranchero and use it as a driver. Eventually it will end up in my 69 Mach

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Re: Boss 545 high vacuum can for street car ?

Post  BBFTorino on November 4th 2018, 1:10 am

I apologize in advance, but what is the sense in building a Boss headed motor, then trying to keep it tame and use mild/stock parts??

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Re: Boss 545 high vacuum can for street car ?

Post  cletus66 on November 4th 2018, 8:58 am

BBFTorino wrote:I apologize in advance, but what is the sense in building a Boss headed motor, then trying to keep it tame and use mild/stock parts??


I'm looking for a similar combo. I have an A460 block, 572 rotator with 10.1:1 comp, ported SCJ heads, and a Mafia intake. I want to be able to put pump gas in it, and drive it anywhere with EFI (looking at this one: https://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_stealth_4500/ ) OD trans and the AC pumping. I got the stuff from Lem and I have already talked to him about a custom cam. I will set up the ring gaps for unnatural aspiration. If I want to drive it to the track and hit it with a 400 shot or bolt on a centrifugal, the foundation is there.
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Re: Boss 545 high vacuum can for street car ?

Post  mach1charlie on November 4th 2018, 12:39 pm

Because the Boss 429 is the most beautiful motor ever built. I will play with this motor the rest of my life. This is just the beginning, more cam to come.

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Re: Boss 545 high vacuum can for street car ?

Post  jasonf on November 4th 2018, 3:50 pm

mach1charlie wrote:Well $7,700 with kasse. Scat $1900, and a $200 truck motor. I figure 12k.
Gonna put it in an old Ranchero and use it as a driver. Eventually it will end up in my 69 Mach

Cool. I was just curious.
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Re: Boss 545 high vacuum can for street car ?

Post  cletus66 on November 4th 2018, 3:51 pm

mach1charlie wrote:Because the Boss 429 is the most beautiful motor ever built. I will play with this motor the rest of my life. This is just the beginning, more cam to come.

rmcomprandy , who responded earlier in the thread, ground a custom cam for me several years ago. It did exactly what I asked for, and then some. The cost difference between a catalog cam and a custom cam is negligible. I suggest that you call him.
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Re: Boss 545 high vacuum can for street car ?

Post  BBFTorino on November 5th 2018, 12:49 am

mach1charlie wrote:Because the Boss 429 is the most beautiful motor ever built. I will play with this motor the rest of my life. This is just the beginning, more cam to come.
You are certainly right about that!! I put the Boss 429 in the #1 spot for beauty and eye appeal. Well, the rest of my list would be like this.....
#1...Boss 429
#2...427 FE SOHC "Cammer"
#3...Mopar 426 Hemi
#4...Boss 351 Cleveland
#5...348/409 "W" Chevy
#6...Regular big block Chevy
#7...Small block Chevy
#8...Gen III Mopar Hemi
#9...Ford Modular 4.6/5.4
#10...Mid 1950's era Jaguar inline 6 cyl. with the down draft carbs.

Just my opinion of course!!....feel free to switch it around how y'all see fit!! Cool

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Re: Boss 545 high vacuum can for street car ?

Post  Carbguy on November 5th 2018, 11:31 am

1. Keep in mind your pushrod angle when trying to use a flat tappet camshaft. That was / is an issue on a Boss engine. Kaase doesn't build anything off of a flat tappet grind for that reason.
2. With your duration numbers depending on what you do for lobe sep you're most likely going to be about 16" hg.

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Re: Boss 545 high vacuum can for street car ?

Post  cletus66 on November 5th 2018, 11:57 am

BBFTorino wrote:
mach1charlie wrote:Because the Boss 429 is the most beautiful motor ever built. I will play with this motor the rest of my life. This is just the beginning, more cam to come.
You are certainly right about that!! I put the Boss 429 in the #1 spot for beauty and eye appeal. Well, the rest of my list would be like this.....
#1...Boss 429
#2...427 FE SOHC "Cammer"
#3...Mopar 426 Hemi
#4...Boss 351 Cleveland
#5...348/409 "W" Chevy
#6...Regular big block Chevy
#7...Small block Chevy
#8...Gen III Mopar Hemi
#9...Ford Modular 4.6/5.4
#10...Mid 1950's era Jaguar inline 6 cyl. with the down draft carbs.

Just my opinion of course!!....feel free to switch it around how y'all see fit!! Cool


IHMO, it's a tossup between the Cammer and the Boss, and you can't leave out the regular 427 FE either. Basketball
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Re: Boss 545 high vacuum can for street car ?

Post  BOSS 429 on November 5th 2018, 12:03 pm

THATS JUST SILLY,   I just did another solid lifter BOSS 429 , Solid roller,or solid lifter is the best way to go with these engines.
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Re: Boss 545 high vacuum can for street car ?

Post  mach1charlie on November 5th 2018, 12:40 pm

Yeah, factory was flat tappet.

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