New Setup...Trans Question

[351carlo]

Ok guys, the new setup is listed below:

351 Cleveland with 2 V heads
.030 over
2.055 Intake / 1.71 Exhaust Manley Swirled Stainless Valve
.519/.519 lift cam 270H Comp Cams with matching springs
3A valve job
Erson Roller Rockers riding on a Crane Cam Conversion kit
Hardened Pushrods
Speed Pro Hypereutectic 9.5:1 Compression Pistons
Canton 7qt oil pan w/ Crank scraper
1 3/4" Hooker Comp Headers
2.5'' dual exhaust, awaiting H-Pipe
Edelbrock Performer intake
Road Demon 625 carb
Pertronix Ignitor II Ignition

Going for 375 at the crank. Problem is my transmission, an FMX, was just rebuilt new, and a B&M shiftkit installed, stage II Street/Strip setting. A slightly higher than stock converter installed, no more than 2500 RPMs. I know the FMX is the heavy beast, and more parasitic than others, so what type of loss is typical from them. Going from 375 at the crank, what type of power should I expect to see at the wheels?

I appreciate the help guys.

 

[HistoricMustang]

I remember reading somewhere that as a general rule, it is a 50 to 75 horsepower drop to the rear wheels. Someone correct if I am wrong.

If you are just dying to know spend a few bucks and her put on a dyno.

HistoricMustang
www.historicmustang.com

 

[302 coupe]

I think the FMX sits right between the C4 and the C6 as far as parasitic loss is concerned. I wouldn't worry about it....

As far as power, I'd go with a bigger carb but for street driving you won't notice much difference. I'd say 330 at the fly, 270ish at the wheels. 375hp is asking a lot for the 2V heads and 9.5:1 compression.....

 

[351carlo]

I think the FMX sits right between the C4 and the C6 as far as parasitic loss is concerned. I wouldn't worry about it....

As far as power, I'd go with a bigger carb but for street driving you won't notice much difference. I'd say 330 at the fly, 270ish at the wheels. 375hp is asking a lot for the 2V heads and 9.5:1 compression.....

I'm going with a 750 Holley once I get it rebuilt. Just sitting here waiting for me to rebuild it.

My machinist says 375 is conservative with the way the heads sit right now...not sure why, but he's pretty confident on 375+. I guess we'll find out soon enough.

 

[302 coupe]

do you have any details on the heads, besides them being 2V castings? Open or closed chamber, any port work, etc....

This is just my opinion, but 2V heads are for stock engines. If you want performance, the 4V heads are practically a must have. I've driven a few cleveland powered fords, and rebuilt one 2V and also a 4V. The 2V was built to be a street engine, it got a mild cam, 9.5:1 comp., performer intake, a 600 holley, and good duals. The engine ran well, but lacked power. The 4V had closed chamber heads, stock intake manifold, 750 double pumper, 10.5:1 comp., and a crane cam with .519/.524 lift and 230ish dur@ .050. The 4V was actually a pretty mild build, but simply annihilated the 2V in power. It had good street manners and ran well on pump gas too. It made me a believer in the 4V heads, and trust me they don't lack low end power at all. I think the guys that started that rumor are the guys shipping in aussie 2V heads.....

 

[351carlo]

It's just a set of stock 2v heads which are given some better valves. They're topped off with the valves mentioned above (2.055/1.71). The ports are still abnormally large for a motor of it's size. I'm running a .519/.519 cam. I would have preferred to run some 10.5:1 Forged pistons, but budget was tight, and decided against it. Running what is supposed to be the 9.5:1 hyper's required milling down the head to achieve the proper CR with my open chambers.