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Old 06-04-2013, 06:45 PM
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how much horsepower from my 406

hi everyone newbie to the board here. I have a 406 build happening right now. I would like to know the approximate horsepower of my engine. I have the block zero decked, pistons are about .003 in the hole with .039 head gasket compressed thickness, dart/world products sportsman II heads 215/64 cc and they have been ported and have 2.05/1.6 valves. I have 1.5 roller rockers, a victor jr, a holley 950, one in spacer, a lunati solid roller grind # rra 274-278 it is .630/.630 rpm range 4,000-8,000, crane roller lifters, KB Icon forged race flat tops which on their site estimate to b 11.8:1 with my combustion chambers, I have large journal 6 in. aluminum rods, steel crank, and i have a turbo 350 with a 4500 stall and a narrowed 9 in rearend with 4.11 gear. a msd pro billet distributor with bronze gear, curved, 36 degrees timing for premium pump gas, msd 6al box, and I'm wondering about what I have horsepower wise. thanks!

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Old 06-04-2013, 07:02 PM
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That is a lot of camshaft if that is at .050. Hope you have studs in all of it. Do you know what the flow numbers are on the heads? Here is a link to the camshaft. Cam Spec Card :: Lunati Power

Last edited by Bowtie man; 06-04-2013 at 07:10 PM.
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Old 06-04-2013, 07:21 PM
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head flow numbers is important to know,should be over 600 for first rough guess.
Aluminum rods?sounds like drag race only?big split in duration of the cam?why the big split?rocker shafts are something to consider for extreme RPMs
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Old 06-04-2013, 07:47 PM
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what size are the primary pipes on your headers? are they stepped?Dont worry about exhaust system,,,
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Old 06-05-2013, 12:15 AM
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Not sure on the flow numbers as I haven't had em flowed. Buddy gave em to me. Heads got 7/16 screw in studs and guideplates. Bronze guides. Cam is 106 centerline. Pipes 1 3/4 and three in exhaust.
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Old 06-05-2013, 06:41 AM
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what block?
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Old 06-05-2013, 06:47 AM
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1 3/4 primaries are a little small but should work ok. Without flow numbers the guesses will have a wider range. use race fuel only
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Old 06-05-2013, 09:19 AM
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How bout 1 7/8 primary? Could u give me approximate number assuming the heads flow 275-300 cfm?
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Old 06-05-2013, 09:21 AM
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Also trying to keep it on premium pump gas so as to b able to street it. 600-650 horse was my goal.
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Old 06-05-2013, 09:09 PM
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300 CFM will give you the potential to make over 600 HP
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Old 06-05-2013, 09:36 PM
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Quote:
Originally Posted by stratzmanj View Post
hi everyone newbie to the board here. I have a 406 build happening right now. I would like to know the approximate horsepower of my engine. I have the block zero decked, pistons are about .003 in the hole with .039 head gasket compressed thickness, dart/world products sportsman II heads 215/64 cc and they have been ported and have 2.05/1.6 valves. I have 1.5 roller rockers, a victor jr, a holley 950, one in spacer, a lunati solid roller grind # rra 274-278 it is .630/.630 rpm range 4,000-8,000, crane roller lifters, KB Icon forged race flat tops which on their site estimate to b 11.8:1 with my combustion chambers, I have large journal 6 in. aluminum rods, steel crank, and i have a turbo 350 with a 4500 stall and a narrowed 9 in rearend with 4.11 gear. a msd pro billet distributor with bronze gear, curved, 36 degrees timing for premium pump gas, msd 6al box, and I'm wondering about what I have horsepower wise. thanks!
I'll run the air dyno for you if you can come up with some head flow numbers....0.100" through 0.600", intake and exhaust. There is nothing credible on the Stan Weiss site.
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Old 06-05-2013, 09:53 PM
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Well I can't take em to a flow bench but a stock dart 215 with no porting is about 268 cfm out of the box. Mine have been ported and I have 2.05/1.60 valves so can we get numbers at 275 cfm and 300 cfm?
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Old 06-09-2013, 12:50 PM
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Quote:
Originally Posted by vinniekq2 View Post
head flow numbers is important to know,should be over 600 for first rough guess.
Aluminum rods?sounds like drag race only?big split in duration of the cam?why the big split?rocker shafts are something to consider for extreme RPMs
With aluminum rods they do have a short life because of stretch.So street miles should be very limited if at all.If purchased used needs to be checked.
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Old 06-09-2013, 01:22 PM
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Quote:
Originally Posted by stratzmanj View Post
Well I can't take em to a flow bench but a stock dart 215 with no porting is about 268 cfm out of the box. Mine have been ported and I have 2.05/1.60 valves so can we get numbers at 275 cfm and 300 cfm?
Go back and read my post and do what I asked you to do if you want my help.
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