Question for the guys that do porting?

**superboattwin250** · 01-14-2017, 06:40 PM

Just wondering if when people do a drag cut on a merc 2.5 block if they angle the top of the transfer ports or make them straight. Thanks for the help!

**FORBESAUTO** · 01-15-2017, 08:32 AM

straight from side to side and flat on top with angle cut on sides towards boosters. I guess I'll be the sucker to start this one lol

**superboattwin250** · 01-15-2017, 08:45 AM

Thanks for the info! I have seen some straight and some angled. I got a block for a great price and raising the port timing a little bit for some more top end.

**FORBESAUTO** · 01-15-2017, 08:54 AM

In my opinion the angled roofs from side to side work a little better on heavier boats. So kinda depends on boat. But all drag motas I've seen were straight. Maybe others will chime in also.

**superboattwin250** · 01-15-2017, 12:23 PM

This will be for drag racing only 800 feet on an ally xr01 in the 1400 pound class. Figured I would give it it a try.

**FORBESAUTO** · 01-15-2017, 12:58 PM

Ten fo then straight it is

**wrechin2** · 01-16-2017, 12:01 AM

Here is the port layout for the 300 drag. Hope this helps. The angle helps direct the fuel away from the exhaust.

**gmjim** · 01-16-2017, 01:59 AM

you certainly are a wealth of information Wrechin2!!! Do you have any maps like that for a 2.5 280 or a 2 litre champ block?

**wrechin2** · 01-16-2017, 07:45 AM

Originally Posted by gmjim

you certainly are a wealth of information Wrechin2!!! Do you have any maps like that for a 2.5 280 or a 2 litre champ block?

No I don't. Sorry.

**gmjim** · 01-16-2017, 06:04 PM

is there any chance I could get a clearer copy of the picture above? I cant quite make out the numbers. I am working on a cad file to have some sleeves cut and although this is not the map I want to use it would help me greatly in understanding what I need as far as angles etc.

**superboattwin250** · 01-16-2017, 06:27 PM

Thanks again for all the great info guys! Anyone know the difference between the older and newer (02) -'s up motors ?

**wrechin2** · 01-16-2017, 07:42 PM

Originally Posted by gmjim

is there any chance I could get a clearer copy of the picture above? I cant quite make out the numbers. I am working on a cad file to have some sleeves cut and although this is not the map I want to use it would help me greatly in understanding what I need as far as angles etc.

Sure as long as i get a copy of the dxf. Pm me your email.