Need help with parts selections.

MiracleMax · 12-26-2000, 10:49 PM

Looks like a good street motor. The cam is a bit mild (even the second one). I dug out my not so trusty dyno sim and plugged in these numbers

351 Windsor V8 (.030 over)

357.2 cubic inches
9.50:1 comp ratio
750 cfm carb
Dual Plane manifold
Small headers (1-3/4) with mufflers
GT40p heads (stock flow numbers)
35-418-3 hyd cam

Peak HP: 311 @ 4500 rpm
Peak TQ: 391 @ 3000 rpm

The program can have upto a 10% error (kinda big for me seeing as it can go 30 hp either way, but it's not to bad for basic comparisions

BTW to figure what primary pipe size is needed for your application the formula is;

Primary Pipe Size=RPM x SCID/88200
RPM=Revolutions Per Minute
SCID=Single Cylinder Displacement (CID/8)

Unfortunately I don't have an accurate formula for primary pipe length or collector size, but this is handy none the less.

By the way things look you could go with an even more aggressive cam? A Hyd roller maybe?

I got my cylinder head flow numbers below. You might consider the GT40p heads instead of the ported 351 heads. They feature a more efficent combustion chamber/plug layout which might allow you to run a bit more timing. Especially with the headers installed? Maybe a half point or point more?

10:1 comp HP: 320 @ 4500 TQ: 400 @ 3000
10.5:1 comp HP: 325 @ 4500 TQ: 406 @ 3000

It looks like 10:1 would be the best way to go if you care to try?

The flow numbers for the GT40p heads came from the link below
http://www.fordmuscle.com/archives/2...ds/index.shtml

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12-26-2000, 10:49 PM	#3
MiracleMax Registered Member Join Date: Apr 1999 Location: Hayes, Va, USA Posts: 798	Looks like a good street motor. The cam is a bit mild (even the second one). I dug out my not so trusty dyno sim and plugged in these numbers 351 Windsor V8 (.030 over) 357.2 cubic inches 9.50:1 comp ratio 750 cfm carb Dual Plane manifold Small headers (1-3/4) with mufflers GT40p heads (stock flow numbers) 35-418-3 hyd cam Peak HP: 311 @ 4500 rpm Peak TQ: 391 @ 3000 rpm The program can have upto a 10% error (kinda big for me seeing as it can go 30 hp either way, but it's not to bad for basic comparisions BTW to figure what primary pipe size is needed for your application the formula is; Primary Pipe Size=RPM x SCID/88200 RPM=Revolutions Per Minute SCID=Single Cylinder Displacement (CID/8) Unfortunately I don't have an accurate formula for primary pipe length or collector size, but this is handy none the less. By the way things look you could go with an even more aggressive cam? A Hyd roller maybe? I got my cylinder head flow numbers below. You might consider the GT40p heads instead of the ported 351 heads. They feature a more efficent combustion chamber/plug layout which might allow you to run a bit more timing. Especially with the headers installed? Maybe a half point or point more? 10:1 comp HP: 320 @ 4500 TQ: 400 @ 3000 10.5:1 comp HP: 325 @ 4500 TQ: 406 @ 3000 It looks like 10:1 would be the best way to go if you care to try? The flow numbers for the GT40p heads came from the link below http://www.fordmuscle.com/archives/2...ds/index.shtml