Help me make more power.....
Pro
Joined: Jul 2010
Posts: 532
Likes: 1
From: new york city ny
Why you telling him to get $1500 heads if he can accomplish his goal with the one he has now???
And 1.8RR on SBC?????
S.
And 1.8RR on SBC?????
S.
Safety Car
Joined: May 2003
Posts: 3,814
Likes: 105
From: Dearborn Heights Michigan
AFR's have 2.05 int & 1.60 exh.
CNC chambers, int & exh ports. $1400 at local speed shop.
You get what U pay for.
His iron heads don't cut it!
Last edited by FKING1; Sep 10, 2010 at 06:36 PM.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Often true in general, definitely true with cylinder heads. 
The existing Vortecs will easily make the power targets. AFRs are the best heads out there - but aren't required for the stated goals and would be a poor investment for build that must top out at no more than about 425 HP based on the capabilities of the shorblock.
The existing Vortecs will easily make the power targets. AFRs are the best heads out there - but aren't required for the stated goals and would be a poor investment for build that must top out at no more than about 425 HP based on the capabilities of the shorblock.
Pro
Joined: Jul 2010
Posts: 532
Likes: 1
From: new york city ny
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
How to get 420 hp from you GM 350 HO
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 854
Likes: 7
From: dudley ma
Billla, trans is a th350 with a shift kit. the gears are 3:55's this is what I was told when I bought the car. not going racing..... just want to break the tires loose off the line without bringing up the rpms and slamming it into gear. have a holley 670 I beleive 4160and eldelbrock performer.... set of dynamax headers... 2.5 in pipes and a set of flowmaster 50's I thank everyone for there help to this point
Last edited by 78pace; Sep 10, 2010 at 08:27 PM.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
You should be able to easily break loose the tires with what you've got without doing a neutral drop - don't do that 
My first thought is that your converter is a mismatch for the engine. I'd take a hard look at the converter and a dyno tune before doing any swaps if it's really that weak right now.
If you do decide to do a cam upgrade, I'd take a look at the CompCams P/N 08-412-8 as a good choice for trans and gears. You could take this one step further with the 08-422-8, but I wouldn't go a bunch further. I would also give CompCams a call directly, lay out all the configuration and goals and get their take as well. The GMPP HOTCAM is going to be about in the same range; there's a really nice HOTCAM kit that comes with the cam, lifters and GMPP-logo roller 1.6 rockers.
Those cams are going to put you into the 375-390 HP range, probably just a touch short of 400 HP. Note that the stated on the HO is pretty optimistic, and is done on the dyno with dyno headers, no accessories, etc. An honest 375-390 is frankly a fair bit of power for a street Corvette.
My first thought is that your converter is a mismatch for the engine. I'd take a hard look at the converter and a dyno tune before doing any swaps if it's really that weak right now.If you do decide to do a cam upgrade, I'd take a look at the CompCams P/N 08-412-8 as a good choice for trans and gears. You could take this one step further with the 08-422-8, but I wouldn't go a bunch further. I would also give CompCams a call directly, lay out all the configuration and goals and get their take as well. The GMPP HOTCAM is going to be about in the same range; there's a really nice HOTCAM kit that comes with the cam, lifters and GMPP-logo roller 1.6 rockers.
Those cams are going to put you into the 375-390 HP range, probably just a touch short of 400 HP. Note that the stated on the HO is pretty optimistic, and is done on the dyno with dyno headers, no accessories, etc. An honest 375-390 is frankly a fair bit of power for a street Corvette.
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
My GM 350 HO measured 293 hp at the rear wheels. Search to CF for the range of crank-to-rear wheel loss and apply backward from RWHP to CHP. My GM 350 HO exceeds the GM advertised [crank] HP and torque. IMO, based on personally measured data, the GM claimed hp and torque are realistic.
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Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 854
Likes: 7
From: dudley ma
thanks Billla and everyone else for your well respected input. I will have the car dyno tuned. I will post all info once that is done. Than we can see about converter. I did buy a converter when I had the trans rebuikt year before last. But the owner of the shop said he sent out the stock converter and had it worked for stall. So it was never installed. My son who is the mechanic by trade and into racing 1/4 mile has told me its not what the shop said it would be. Let me dig out the specs on the converter I bought and I will post back. My son is working on an interesting project. 87 mustang with a turbo'ed ls1......... he is looking for 700 hp. This is want got me going... again thanks to everyone 
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Originally Posted by MN80Vette;1575290063My GM 350 HO exceeds the GM advertised [crank
HP and torque. IMO, based on personally measured data, the GM claimed hp and torque are realistic.
The Car Craft guys that IMHO do excellent test work also found the engine pretty close to rated numbers
http://www.carcraft.com/techarticles.../the_test.html
I just haven't consistenly seen the same results in installations I've worked with, which were also based on chassis dyno runs. I'm not disagreeing with your facts (or Car Craft's) at all - my experience has just been different.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Drifting
Joined: Sep 2010
Posts: 1,412
Likes: 50
From: Laguna Niguel California
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 854
Likes: 7
From: dudley ma
Billla..... what size converter would you recommend? The one I have is a 2400.(still in the box) One in the car most likely stock..... And I did consider the blower but thru the hood is what bothers me Thanks
