L98 Mods
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by zapc
well the new monkey wrench is that I got the 113 heads for $200.00.
could,t pass them up. gonna get them ported and redone. for my plans (remember just looking to keep up with new muscle) do I really need to
go with the larger valves or just go stage 1 porting and gasket match everything.
could,t pass them up. gonna get them ported and redone. for my plans (remember just looking to keep up with new muscle) do I really need to
go with the larger valves or just go stage 1 porting and gasket match everything.
Perhaps someone who's had their 113s ported can supply the numbers you need.
I'm not a porter but I've read a ton of stuff written by guys who are. The consensus is that the greatest flow increase comes from porting the short turn radius, so just a gasket match isn't going to give you the most improvement.
Also, I believe the 113s are what are referred to as thin wall castings. So there's not a lot of meat in the casting to allow for dramatic port size increase without breaking through. You guys with ported 113s can correct me on this if I'm wrong.
Jake
Last edited by JAKE; Jan 15, 2006 at 03:33 PM. Reason: Add'l Comments
Le Mans Master
Joined: May 2000
Posts: 7,033
Likes: 12
Originally Posted by JAKE
I suggest you do some research on this. Try to find a site that shows the airflow obtained from 113s BEFORE and AFTER being ported. See if the time, effort and cost are justified.
Perhaps someone who's had their 113s ported can supply the numbers you need.
Jake
Perhaps someone who's had their 113s ported can supply the numbers you need.
Jake
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by hippy
Doesn't TPiS claim 250 on a set of ported 113 heads?
I feel if a company makes a claim that can't be duplicated in the field that claim becomes more than just suspect. We all know what that's all about, $$$$$$$$.
Jake
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Le Mans Master
Joined: May 2006
Posts: 7,708
Likes: 266
From: indy indiana
the 113 heads are thin wall casting and there just isn't enough there to make a really good flowing head. The vortec outflows it anytime, any day. Yes, its about velocity for our street heads. Remember those ford Cleveland heads, the 4 barrel ones? They didn't work on the street until you really got into the rpms. They had huge flow numbers, but no velocity
Last edited by ghoastrider1; May 7, 2016 at 10:02 AM.
Team Owner
Joined: Sep 2001
Posts: 62,126
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I don't plan to build another anytime soon.
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
I just retrieved the pages for you if you want them. I stuck them here for you for now. Let me know if you want me to remove them as its your work just trying to help.
http://crowz.narmir.com/vehicles/198...corvetteforum/
I have to modify them more to look right on there but before I went hog wild I wanted your ok for them being there.
http://crowz.narmir.com/vehicles/198...corvetteforum/
I have to modify them more to look right on there but before I went hog wild I wanted your ok for them being there.
Advanced
Joined: Dec 2014
Posts: 74
Likes: 0
hey people
been lurking for a year or so, unbelievable bunch of people we got here
supporting our hobby, anyhow I know this has been beat to death, yes I have researched older posts,someone please step up to the plate and give me part#s and all specifics, not just suggestions on my planned upgrades.I also apologize now for the long post runners/manifolds/porting- refer to Darin dochterman on YouTube for all ur questions. He has great videos. I am porting my intake on a 1990 at the moment. Darin gets all the products lined up before and after porting and takes measurements and gives u his opinion. But in my opinion keep the factory manifold/plenum/runners and porting them is the best thing. That's an extra 1k in ur pocket at least and by the time ur done porting ur not gaining much performance from those aftermarket companies.
got an 87 vert automatic, only 41,000 miles. It's got bad valve guide seals, what I am looking to accomplish is High 12's low 13's (enough to keep up with stock modern muscle)I can get a set of 113 heads cheap(like $400.00) I figure at least another $500 or $600 to get them lightly ported and a 3 angle valve job. If I went with larger valves I'm sure I'd start to be in the range of aftermarket heads which is out of my $range right now.I probably will not go with headers (want to keep it stock looking) already have cat back flowmasters and plan to lose the precats and go with a high flow catand front y pipe. I want to do a cam,timing chain,roller rockers if necessary. I want an aftermarket lower intake, and runners but will probably stay with a ported upper plenum.Is this a doable situation? I will also do gears and a converter asap.
here are the specific question's
1 what to do to heads( Should I just do up the stock ones) or go for the 113's, and what do I do to them?please be specific
2 What cam,Intake,and runners? please be specific
thanx all
chris
been lurking for a year or so, unbelievable bunch of people we got here
supporting our hobby, anyhow I know this has been beat to death, yes I have researched older posts,someone please step up to the plate and give me part#s and all specifics, not just suggestions on my planned upgrades.I also apologize now for the long post runners/manifolds/porting- refer to Darin dochterman on YouTube for all ur questions. He has great videos. I am porting my intake on a 1990 at the moment. Darin gets all the products lined up before and after porting and takes measurements and gives u his opinion. But in my opinion keep the factory manifold/plenum/runners and porting them is the best thing. That's an extra 1k in ur pocket at least and by the time ur done porting ur not gaining much performance from those aftermarket companies.
got an 87 vert automatic, only 41,000 miles. It's got bad valve guide seals, what I am looking to accomplish is High 12's low 13's (enough to keep up with stock modern muscle)I can get a set of 113 heads cheap(like $400.00) I figure at least another $500 or $600 to get them lightly ported and a 3 angle valve job. If I went with larger valves I'm sure I'd start to be in the range of aftermarket heads which is out of my $range right now.I probably will not go with headers (want to keep it stock looking) already have cat back flowmasters and plan to lose the precats and go with a high flow catand front y pipe. I want to do a cam,timing chain,roller rockers if necessary. I want an aftermarket lower intake, and runners but will probably stay with a ported upper plenum.Is this a doable situation? I will also do gears and a converter asap.
here are the specific question's
1 what to do to heads( Should I just do up the stock ones) or go for the 113's, and what do I do to them?please be specific
2 What cam,Intake,and runners? please be specific
thanx all
chris
Advanced
Joined: Dec 2014
Posts: 74
Likes: 0
well you're going to run into a problem right off the bat. for some reason you're saying you want your exhaust to remain in stock form. the L98 stock exhaust is one of the worst and most restrictive setups. to make H/C/I work, you better start with your exhaust and that means nothing less than long tube headers, dumping the precats.
Yo
Advanced
Joined: Dec 2014
Posts: 74
Likes: 0
thanks jake
my intentions were to do heads,cam and intake at the same time,
I was hoping to get away without going to long tube headers, just with cat back, new high flow cat & no precats but if I have to use headers I will. also if I have to go the superam route I will, but was hoping to keep the stock upper plenum just ported,someones intake and runners,
(not sure which ones are best yet) from most of the reading I have been doing most people seem to recommend the zz9 cam and afs heads,
obviously youve had luck with your recomendations?
my intentions were to do heads,cam and intake at the same time,
I was hoping to get away without going to long tube headers, just with cat back, new high flow cat & no precats but if I have to use headers I will. also if I have to go the superam route I will, but was hoping to keep the stock upper plenum just ported,someones intake and runners,
(not sure which ones are best yet) from most of the reading I have been doing most people seem to recommend the zz9 cam and afs heads,
obviously youve had luck with your recomendations?
Last edited by tuned; May 24, 2016 at 05:52 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
tuned dont waste your time with stock runners you will gain ZERO
Ignore whoever told you that
U don't get much difference when comparing the 2 after u port them also
Last edited by cv67; May 24, 2016 at 06:03 PM.
