Head flow questions?
Thread Starter
Instructor
Joined: Jul 2001
Posts: 240
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From: kennett square,pa,us
Head flow questions?
My question is this. I am running GM Fast Burns on my SBC. They are suposely 210cc. If I should elect to have them ported to increase their flow will I be still able to use the following other engine parts I currently am using.
650 Street Demon, 1 5/8 headers,and 2 1/2 dual exhaust? These are new items installed last year and I really don't want to upgrade them!
Your info on this subject would be greatly appreciated and will help with my decision!
Thanks,
Bud Snyder
650 Street Demon, 1 5/8 headers,and 2 1/2 dual exhaust? These are new items installed last year and I really don't want to upgrade them!
Your info on this subject would be greatly appreciated and will help with my decision!
Thanks,
Bud Snyder
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Re: Head flow questions? (bud snyder)
What are the specs on your cam. If you are running a relatively mild street set up the heads are O.K. What kind of intake are you running :chevy
Thread Starter
Instructor
Joined: Jul 2001
Posts: 240
Likes: 0
From: kennett square,pa,us
Re: Head flow questions? (69 N.O.X. RATT)
69,
I am using a Comp 274 XE & an Edelbrock 2116 Performer.
Cam Specs as follows:Duration 230 in 236 ex, 110 Lobe seperation, intake lift.512 exhaust 522.68 1.6 Crane 1.6 Roll Rockers.
Thanks for your reply.
Bud
I am using a Comp 274 XE & an Edelbrock 2116 Performer.
Cam Specs as follows:Duration 230 in 236 ex, 110 Lobe seperation, intake lift.512 exhaust 522.68 1.6 Crane 1.6 Roll Rockers.
Thanks for your reply.
Bud
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Re: Head flow questions? (bud snyder)
I would think that whatever you would gain on the top end you would lose on the bottom end. You have a relatively mild street set up. There is no doubt the motor would make more top end power, however the way your motor is put together I doubt you would spin it high enough to see much of an average differance over the power band. I would leave the heads alone. If you want more power get a small NOS set up. :chevy
Thread Starter
Instructor
Joined: Jul 2001
Posts: 240
Likes: 0
From: kennett square,pa,us
Re: Head flow questions? (69 N.O.X. RATT)
69,
I agree with you 100% the more i think about the heads. I never gave what you said much thought, but you are definetly right.
The other consideration is that if you think about the initial cost of the heads and the additional cost to have them ported etc. you now have a total investment of over 3k in a set of Gm heads! Not a sound decision to say the least. They are just not worth the money.
I had thoughts of changing the valve springs at the same time as it seems that i am encountering valve float with that cam at 5,300 Rpms or so. If you think about what you said it would also be true that to rev to 6k and then shift at 6,500 vs. 5,800 the gain in performance would not be enough to warrant the abuse the engine would experience.
The bottom line was 300Hp whp with this engine and it appears that that is not really going to happen.
Thanks again for your help.
Bud
[Modified by bud snyder, 9:32 PM 1/29/2002]
I agree with you 100% the more i think about the heads. I never gave what you said much thought, but you are definetly right.
The other consideration is that if you think about the initial cost of the heads and the additional cost to have them ported etc. you now have a total investment of over 3k in a set of Gm heads! Not a sound decision to say the least. They are just not worth the money.
I had thoughts of changing the valve springs at the same time as it seems that i am encountering valve float with that cam at 5,300 Rpms or so. If you think about what you said it would also be true that to rev to 6k and then shift at 6,500 vs. 5,800 the gain in performance would not be enough to warrant the abuse the engine would experience.
The bottom line was 300Hp whp with this engine and it appears that that is not really going to happen.
Thanks again for your help.
Bud
[Modified by bud snyder, 9:32 PM 1/29/2002]
Melting Slicks
Joined: Jul 2000
Posts: 2,112
Likes: 2
From: Peoria IL
Re: Head flow questions? (bud snyder)
Those heads are OK. If the valvesprings aren't good that issue should be adressed. If you copy the Fastburn crate motor setup and use a HOT cam or similar 430+hp shouldn't be out of the question. At that point your carb and headers would be holding back any further progress. :)
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