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Semi polished intake ports on 340 Head: OK or not? #616474 02/17/10 11:01 PM 02/17/10 11:01 PM
Joined: Jan 2003 Posts: 1,620 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,620 MA	I have a set of 1971 2.02 U Heads, that someone spent countless hours on porting them. The intake ports are so smooth that I am concerned about them being too smooth. I would describe the finish to be semi polished. It looks like they were ported with approx 320 grit rolls. They left no stone unturned and the entire port is done this way, with no signs of any of the original rough casting left. Are these heads OK to use for any type of application? If not, is there anyway to save them? Thanks.

Re: Semi polished intake ports on 340 Head: OK or not? [Re: ragtop] #616475 02/17/10 11:44 PM 02/17/10 11:44 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: I have a set of 1971 2.02 U Heads, that someone spent countless hours on porting them. The intake ports are so smooth that I am concerned about them being too smooth. I would describe the finish to be semi polished. It looks like they were ported with approx 320 grit rolls. They left no stone unturned and the entire port is done this way, with no signs of any of the original rough casting left. Are these heads OK to use for any type of application? If not, is there anyway to save them? Thanks. Some say they should have some roughness to help mix the A/F.... so if you hit them with a 120 grit tootsie rolls it should be fine... basically just rough them up some dont change the ports (unless they need it)

Re: Semi polished intake ports on 340 Head: OK or not? [Re: ragtop] #616476 02/18/10 12:11 AM 02/18/10 12:11 AM
Joined: Oct 2004 Posts: 1,752 detroit area M moderncylinder top fuel
moderncylinder top fuel M Joined: Oct 2004 Posts: 1,752 detroit area	sand blast them

Re: Semi polished intake ports on 340 Head: OK or not? [Re: MR_P_BODY] #616477 02/18/10 12:15 AM 02/18/10 12:15 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	60 grit at the most. I don't use a sand roll in my stuff at all. 5813732-BrianSpring974006.jpg (111 downloads)

Re: Semi polished intake ports on 340 Head: OK or not? [Re: S/ST 3040] #616478 02/18/10 12:23 AM 02/18/10 12:23 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	.....unless I have to. 5813750-DSCN1432.JPG (122 downloads)

Re: Semi polished intake ports on 340 Head: OK or not? [Re: S/ST 3040] #616479 02/18/10 01:13 PM 02/18/10 01:13 PM
Joined: Jul 2003 Posts: 4,796 Holland MI Ottawa 2 2boltmain master
2boltmain master 2 Joined: Jul 2003 Posts: 4,796 Holland MI Ottawa	Man how do you know what is an acceptable amount of the intake valve guide that can be removed? I am home/hobbyist working some J heads. I am too scared to remove real bulk from that guide so I just used a 60grit roll and removed casting bumps, slag and blemishes. Keep old mopars alive.

Re: Semi polished intake ports on 340 Head: OK or not? [Re: moderncylinder] #616480 02/18/10 01:16 PM 02/18/10 01:16 PM
Joined: Nov 2006 Posts: 637 Kokomo,IN StripeHOG mopar
StripeHOG mopar Joined: Nov 2006 Posts: 637 Kokomo,IN	Quote: sand blast them Andrew Brough D372 1969 Dodge Dart GTS 1.43 60'best 6.82 1/8 98mph "the light came on and I ran out of talent"

Re: Semi polished intake ports on 340 Head: OK or not? [Re: ragtop] #616481 02/18/10 03:40 PM 02/18/10 03:40 PM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	Hit 'em with 60 grit rolls. If you don't have any you'll find they're the ones you'd use the most if you did have them and they come in handy.

Re: Semi polished intake ports on 340 Head: OK or not? [Re: dodgeboy11] #616482 02/18/10 06:26 PM 02/18/10 06:26 PM
Joined: Jan 2003 Posts: 931 D dulcich super stock
dulcich super stock D Joined: Jan 2003 Posts: 931	You are getting overly concerned about nothing. You are going to be wasting your time and effort "roughing" the ports for no benefit whatsoever. Case of some "theory" getting blown way out of proportion. I can say sandblasting or running a sandpaper roll over the existing ports will be unlikely to give any noticable improvement. Put those heads together and consider yourself lucky you found a set of ported heads. -dulcich

Re: Semi polished intake ports on 340 Head: OK or not? [Re: dulcich] #616483 02/18/10 06:55 PM 02/18/10 06:55 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	I would add........If they were finished with 320 grit, there's a good chance they didn't know what they were doing to begin with. The head I have pictured, was finished with 60 grit so, it may just appear to be too fine of finish. Here is a 60 grit finish in a different light. (The port, not the chamber) 5815103-DSCN1952.JPG (69 downloads)

Re: Semi polished intake ports on 340 Head: OK or not? [Re: S/ST 3040] #616484 02/18/10 10:50 PM 02/18/10 10:50 PM
Joined: Feb 2006 Posts: 1,051 The Great White North RAMM super stock
RAMM super stock Joined: Feb 2006 Posts: 1,051 The Great White North	I hardly ever use a sand (tootsie) roll. I just touch up the carbide marks with a grinding stone--maybe. J.Rob 5815662-Mopartspic.jpg (56 downloads) 2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3

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