Boss 545 high vacuum can for street car ?

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.

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.

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

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.

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??

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

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??

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.

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.

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.

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.

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!!

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.

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!!

IHMO, it's a tossup between the Cammer and the Boss, and you can't leave out the regular 427 FE either.

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.

Yeah, factory was flat tappet.