Porting the 243s
02-22-2008, 01:07 AM
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Here you go: http://www.sa-motorsports.com/diyport.aspx
I bought one of their porting kits to do my 243's and throttle body
I bought one of their porting kits to do my 243's and throttle body
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02-22-2008, 11:53 AM
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id recomend finding a older set of heads to practice on...and i dont see you doin alot with a dremal...i use a 1/3 hp makita die grinder on a regulator....
i have nothin against diy porting but if its your first time out i wouldnt use those 243s......
i have nothin against diy porting but if its your first time out i wouldnt use those 243s......
02-22-2008, 01:05 PM
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02-24-2008, 06:17 PM
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I doubt the Dremel will have the reach you want, for some of it.
I got a 1/4" electric die grinder off eBay for $10 and a set of
carbide burrs for not much more. The ball and flame shaped ones
were the most useful to me. I got long shank ones and ran the
grinder off a Variac to slow it down so they wouldn't whip, and
wore welding gloves so I could guide and press it by the shank.
Slow material removal is an amateur's friend.
All I did was blend things, port match to the gaskets for the
intake I wanted, take out sharp edges and so on. You can go
too far especially for a daily driver, you want to understand
what some of the "funny bumps" are about.
I can't say whether I gained or lost anything by porting them
but the combo (heads went on with a cam & springs) woke up
a fair bit going by track MPH. I got used LS2 (243) heads for
a fairly reasonable price. But factoring in labor, if I was on the
clock I would have probably come out ahead buying AFR 205s
or something. Just remember, bigger is not necessarily better.
Unless you can use it.
I got a 1/4" electric die grinder off eBay for $10 and a set of
carbide burrs for not much more. The ball and flame shaped ones
were the most useful to me. I got long shank ones and ran the
grinder off a Variac to slow it down so they wouldn't whip, and
wore welding gloves so I could guide and press it by the shank.
Slow material removal is an amateur's friend.
All I did was blend things, port match to the gaskets for the
intake I wanted, take out sharp edges and so on. You can go
too far especially for a daily driver, you want to understand
what some of the "funny bumps" are about.
I can't say whether I gained or lost anything by porting them
but the combo (heads went on with a cam & springs) woke up
a fair bit going by track MPH. I got used LS2 (243) heads for
a fairly reasonable price. But factoring in labor, if I was on the
clock I would have probably come out ahead buying AFR 205s
or something. Just remember, bigger is not necessarily better.
Unless you can use it.
06-12-2008, 11:37 PM
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I'm gonna do my 853's. They are just a spare set i have had laying around for 2.5yrs. Might as well learn how to do something with them even if i ruin them i'll be ok. I can practice, practice, practice. 
06-14-2008, 01:56 PM
#17
the 243s flow good out the box . though you can touch them up a bit . i used carbide bits to get rid of the heavy material . you dont have to take out a lot of material for a small gain but if you take out a lot and dont have a flow bench you may hurt . do some reading on here you can find out some good info .
