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Tunnel Rammed 351 Windsor Carby selection 

 

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 Post subject: Tunnel Rammed 351 Windsor Carby selection
Posted: Wed Sep 13, 2017 3:59 pm 
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Hi just thought I would ask if anyone has done a 351 Windsor with tunnel ram. I am nearly completed with one for my XW Falcon to replace my Faithfull old Clevo. I have included some pictures of My windsor as it is at the moment. Thought you might be interested. I am interested in some input as to carby selection. I have some 465s calibrated for Tunnel Ram but I also have the opportunity to swap for a pair of 660 center squirters. I have never had a Tunnel Rammed engine always been on my wish list. I just love the look to be honest so far its all new to me so heres a few specs for any of you who do have an idea. 11.4:1 comp ratio Comp Cams solid camshaft : ADV Duration 285 295 Dur @50 250 262 Valve lift .568 .592 Lob sep 106, AFR 195cc competition ally heads , Offenhauser 360 degree tunnel ram with price motor sport (PME) adaptor plates. My son is an apprentice Engine Machinist so this is a Father son project all built in the back yard.

 

 

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 Post subject: Re: Tunnel Rammed 351 Windsor Carby selection
Posted: Thu Sep 14, 2017 4:02 pm 
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Cool setup! 8-)

Carb sizing is going to be based on the use of the engine, rpm range, etc.

For example, if it is an auto, with a 2500 stall, 3.5/3.7 diff, the 465's will be plenty big enough. If it is a manual, or has a 4000 stall, with 4.1 or shorter gears, the carbs could be bigger. The old 660 centre-dribblers are not really a street carby, more a drag-race thing, but if they are set-up properly they will work ok.

At the end of the day, a single 750 on a good intake will probably work better than the 'ram, but wont look as cool. Obviously the tunnel ram is made for high-rpm applications, so you may find it runs a bit ragged at low rpms, but they are fun when they work.

Enjoy. 8-)

 

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 Post subject: Re: Tunnel Rammed 351 Windsor Carby selection
Posted: Thu Sep 14, 2017 4:04 pm 
Getting Side Ways
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Oh, and have you checked if the distributor fits past the tunnel ram. Some are too big (outer diameter) and won't physically fit in there...

 

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 Post subject: Re: Tunnel Rammed 351 Windsor Carby selection
Posted: Tue Sep 19, 2017 8:23 pm 
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Yeah had problem with distributor clearance. I ordered adaptor from PME and it arrived here today. Heading into town tomorrow to get machine shop to press it all together on my MSD Dizzy. I have decided to try the 660s I think you may be right about them but thought I would give them a go. I have one fully rebuilt 465 so chasing another one the same model to do up. Just as back up.

 

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