GM 847 Cam Availability
GM 847 Cam Availability I was wondering if they still make the 847 cam. I was looking to run a larger cam instead of my current 503 cam. If not would my only route be a custom grind to achieve the same specs? Also would my 3.70s be enough gear to run the 847 or should I just step up to 3.90s? Any input would be greatly appreciated.
My goal is 400rwhp, with my current heads that might be a bit of a challenge. They flow 256 @ .600 but have a 62 cc chamber, so I'm losing a bit of compression. I dont have any real hindsight as to why I would like to run the 847. However I have always heard it was a top end screamer that put down good numbers.
Why box yourself into a 15+yo grind. Why not start a discussion about "this is what I have, this is what I want, please help me get there"?
As said 4.10s should be first with an M6.
I might consider doing heads before the cam, good heads will let a cam keep making power to a higher rpm.
As said 4.10s should be first with an M6.
I might consider doing heads before the cam, good heads will let a cam keep making power to a higher rpm.
Well first off my goals are to have a legit quick street car, close to 400rwhp and running low 12s/high 11s. I would like to make the most of what I have without getting too carried away with cost.
I would like to have my heads milled to get my original 11:5:1 CR back, but I'm not really sure how much it would cost. I'm not even really sure what my CR is now with the Trickflows over stock heads.
I've had a few threads in the past asking about what route to go. Most adivsed me that my 503 cam is too small for a 383 and is holding me back quite a bit with my current setup. I would be making a handful of trips to the strip at most over the course of a year. The car would mainly just be a fair weather DD that could haul the mail when neccecasary. What would my most cost effective route?
I would like to have my heads milled to get my original 11:5:1 CR back, but I'm not really sure how much it would cost. I'm not even really sure what my CR is now with the Trickflows over stock heads.
I've had a few threads in the past asking about what route to go. Most adivsed me that my 503 cam is too small for a 383 and is holding me back quite a bit with my current setup. I would be making a handful of trips to the strip at most over the course of a year. The car would mainly just be a fair weather DD that could haul the mail when neccecasary. What would my most cost effective route?
So right now you have as cast 23degree trickflows?
The biggest gain you can make for that motor is porting the heads.
Sure the cam is on the conservative side but a bigger cam is not going to add the power porting could.
The biggest gain you can make for that motor is porting the heads.
Sure the cam is on the conservative side but a bigger cam is not going to add the power porting could.
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I'd swap to a bigger cam like the XFI 468 or something similar from AI or LE. $300 and some gaskets and springs and you'd pick up 30-40hp. Plus you'd extend the rpm range quite a bit and make use of those gears.
I ran those same heads as-cast with the 468 cam on a stock shortblock. I can't answer your question about what your compression is unless you know the exact piston you are running, how far in the hole it is and the head gasket used.
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What head gasket are you using?
What is the block deck height? (Stock is 9.025")
I've had a few threads in the past asking about what route to go. Most advised me that my 503 cam is too small for a 383 and is holding me back quite a bit with my current setup. I would be making a handful of trips to the strip at most over the course of a year. The car would mainly just be a fair weather DD that could haul the mail when necessary. What would my most cost effective route?
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Have you run your car at the track with the current setup? It seems like you should be very close to your goals already, unless you're trying to run those quarter mile times on regular street tires.
What is the cc of the piston valve reliefs?
What head gasket are you using?
What is the block deck height? (Stock is 9.025")
Most "cam experts" here are probably going to try and steer you into a cam that is too big anyway. Read some books written by real professionals on the subject and you'll get a better idea of what you want to do. Then, you'll be armed with at least enough knowledge to talk to one of the many available sponsored vendors here and guaranteed you'll get your car set up right.
What is the cc of the piston valve reliefs?
What head gasket are you using?
What is the block deck height? (Stock is 9.025")
Most "cam experts" here are probably going to try and steer you into a cam that is too big anyway. Read some books written by real professionals on the subject and you'll get a better idea of what you want to do. Then, you'll be armed with at least enough knowledge to talk to one of the many available sponsored vendors here and guaranteed you'll get your car set up right.
I agree that he should be close to those ET goals as it sits.
Far as I know AI wont touch his existing heads anyway so I was not pointing him that way. I believe they prefer to assemble bare castings for their 215cc Trickflow.
He mentioned taking them off for milling anyway, long as they are off might as well do the job right.
A cam upgrade would be good but, IMO the heads stand to gain him more.
I really don't think a cam is going to gain him 30-40hp over his already decent but conservative cam, I do think porting could get him that kind of gain though.
He mentioned taking them off for milling anyway, long as they are off might as well do the job right.
A cam upgrade would be good but, IMO the heads stand to gain him more.
I really don't think a cam is going to gain him 30-40hp over his already decent but conservative cam, I do think porting could get him that kind of gain though.
My goal is 400rwhp, with my current heads that might be a bit of a challenge. They flow 256 @ .600 but have a 62 cc chamber, so I'm losing a bit of compression. I dont have any real hindsight as to why I would like to run the 847. However I have always heard it was a top end screamer that put down good numbers.
Why box yourself into a 15+yo grind. Why not start a discussion about "this is what I have, this is what I want, please help me get there"?
As said 4.10s should be first with an M6.
I might consider doing heads before the cam, good heads will let a cam keep making power to a higher rpm.
As said 4.10s should be first with an M6.
I might consider doing heads before the cam, good heads will let a cam keep making power to a higher rpm.
DO NOT ORDER THE GM19244485. It is NOT for LT1/LT4. Just got mine in the from summit and it is not for this engine. Even went to Chevy today with the part number and checked with them. The 19244485 is for Gen 1 small blocks!
You were also running a single plane manifold which has a huge effect on the rpm range and your car is a tin can which helps with the lack of torque.
