Is it worth it to port my set of 243s
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
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From: IL
Is it worth it to port my set of 243s Hey everyone, I plan on building a street/strip camaro with the stock ls1. Originally I was just going to do a budget n/a motor but now I'm itching to put some nitrous through it, probably 150-200 wet shot. Now my question is as stated in the title, I have a set of 243s in the machine shop getting refreshed now and a valve job/bowl work with dyno results of a 25hp gain to the crank with a set of stock 853 heads. I'm curious about the benefits of porting them would be. A basic rundown of the other parts on the motor are going to be stock bottom end with arp rod bolts, a comp cam .604/.609 .238/.240, ported fast 92, slp headers with 3 inch true duals, and basically all the other supporting mods for a decent nitrous build. Just wondering what the power differences would be with the H/C/I with and without the porting.
Honestly if the person porting the heads knows what they are doing then you'll always have a net gain with porting, How much depends to many factors to put an exact number on it. With your setup having everything before and after the heads built for better breathing it would be a shame not to get the heads worked if it's in the budget.
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
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From: IL
Originally Posted by LLLosingit
Honestly if the person porting the heads knows what they are doing then you'll always have a net gain with porting, How much depends to many factors to put an exact number on it. With your setup having everything before and after the heads built for better breathing it would be a shame not to get the heads worked if it's in the budget.
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Regarding $ to hp.
If the $350 porting only gained 10 hp that's well worth it in my opinion. $35 per hp is a good deal. I think proper porting with a good valve job will gain 25hp to 30 hp.
If the $350 porting only gained 10 hp that's well worth it in my opinion. $35 per hp is a good deal. I think proper porting with a good valve job will gain 25hp to 30 hp.
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Verdad Gallardo I would jump on it at that price lol People spend $500-$1000 on news intakes or cam changes to gain 10-30hp and CNC porting should put you well over that.
Hey everyone, I plan on building a street/strip camaro with the stock ls1. Originally I was just going to do a budget n/a motor but now I'm itching to put some nitrous through it, probably 150-200 wet shot. Now my question is as stated in the title, I have a set of 243s in the machine shop getting refreshed now and a valve job/bowl work with dyno results of a 25hp gain to the crank with a set of stock 853 heads. I'm curious about the benefits of porting them would be. A basic rundown of the other parts on the motor are going to be stock bottom end with arp rod bolts, a comp cam .604/.609 .238/.240, ported fast 92, slp headers with 3 inch true duals, and basically all the other supporting mods for a decent nitrous build. Just wondering what the power differences would be with the H/C/I with and without the porting.
You said you're already getting bowl work and a valve job and you got 25 hp from that? Is that what you meant?
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
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From: IL
Originally Posted by 00pooterSS
You said you're already getting bowl work and a valve job and you got 25 hp from that? Is that what you meant?
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
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From: IL
Originally Posted by HCI2000SS
Same difference more or less. In general whatever you gain n/a is about what you will gain on the nitrous as well
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
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From: IL
Originally Posted by LLLosingit
I would jump on it at that price lol People spend $500-$1000 on news intakes or cam changes to gain 10-30hp and CNC porting should put you well over that.
I would expect roughly 30 (25-35) over stock heads, so if you're already getting 25, there isn't much left there to gain, but there is some. 10-15 ish, so depends on how much you want to spend to get there. Of course these numbers could go a little higher or lower, it's hard to accurately guess at it.
Last edited by 00pooterSS; Apr 10, 2018 at 02:16 PM.
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
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From: IL
That's why I asked the question I asked. A very big part of the gains in the head work is the bowl work and valve job.
I would expect roughly 30 (25-35) over stock heads, so if you're already getting 25, there isn't much left there to gain, but there is some. 10-15 ish, so depends on how much you want to spend to get there. Of course these numbers could go a little higher or lower, it's hard to accurately guess at it.
I would expect roughly 30 (25-35) over stock heads, so if you're already getting 25, there isn't much left there to gain, but there is some. 10-15 ish, so depends on how much you want to spend to get there. Of course these numbers could go a little higher or lower, it's hard to accurately guess at it.
Gotcha, I'm going to find out about pricing once they get the cnc machine in a few weeks and if i can get lucky and have them done for like 300 or less because im friends with 2 of the guys that work there i might as well get it done just because hp to dollar wouldn't be too bad at that price. I just can't really justify $500 on about 10hp
I'm really curious what they would get from the port work.
You said they already did the valve job, but you didn't say if they did the bowl work, i'd definitely get the bowl work done, the port work will be up to you and $$$ per hp.
Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
Likes: 0
From: IL
Originally Posted by 00pooterSS
And if they're doing testing they can probably give you a more accurate hp number too.
I'm really curious what they would get from the port work.
You said they already did the valve job, but you didn't say if they did the bowl work, i'd definitely get the bowl work done, the port work will be up to you and $$$ per hp.
I'm really curious what they would get from the port work.
You said they already did the valve job, but you didn't say if they did the bowl work, i'd definitely get the bowl work done, the port work will be up to you and $$$ per hp.
so I got a steal by being buddies with them
here's some pics Thread Starter
Staging Lane
Joined: Mar 2018
Posts: 68
Likes: 0
From: IL
Originally Posted by 00pooterSS
**** I need friends like that.
I'd go pull apart the motor on my 2014 truck if I could get bowl work and valve job for $100
I'd go pull apart the motor on my 2014 truck if I could get bowl work and valve job for $100