Is this 350 streetable?
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Is this 350 streetable?
I've been playing with Desktop Dyno and came up with a 476 horsepower 350 roller:
The cam is a Crower roller, p/n 00425 using 1.6 ratio rockers. Is this on the edge of pump gas, or can I bring up the c/r to around 10.75 or 11.0 to one ?(Sunoco sells 94 octane here). - 11:1 would be around 480-490 hp, yikes!
Thanks
[Modified by 71coupe, 7:36 AM 3/30/2004]
The cam is a Crower roller, p/n 00425 using 1.6 ratio rockers. Is this on the edge of pump gas, or can I bring up the c/r to around 10.75 or 11.0 to one ?(Sunoco sells 94 octane here). - 11:1 would be around 480-490 hp, yikes!
Thanks
[Modified by 71coupe, 7:36 AM 3/30/2004]
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Is this 350 streetable? (71coupe)
With a manual tranny and go for 11/1 compression it would be a over 7500 rpm screamer.
With flat tops you will need the heads milled to @60 cc and the quench set to @.040 to get 11/1 compresion. I don't think that there is a dual plane made to fit those heads. actually are you using the flow files from Dart to get this HP?
IMO - I had a smaller S-Roller 355 ci single plane, 750 cfm carb, 10.74 compression, 1 3/4 headers. I thought that it was pretty fast untill I put a 3.750 stroker crank with lots of my old parts and a new block together.
Your ideas are headed the right direction. Why don't you run some simulations with milder cams like this one I own.
int 8 52
ext 55 11 @.050
.622/.610
or this off of a cam card
int 8 48
exh 51 7
.565/.571
Crane makes an even milder street solid roller with 232/240 mid to high .500 lift. Off the top of my head it was something like
int 9 43
exh 57 3
[Modified by gkull, 4:46 PM 3/30/2004]
With flat tops you will need the heads milled to @60 cc and the quench set to @.040 to get 11/1 compresion. I don't think that there is a dual plane made to fit those heads. actually are you using the flow files from Dart to get this HP?
IMO - I had a smaller S-Roller 355 ci single plane, 750 cfm carb, 10.74 compression, 1 3/4 headers. I thought that it was pretty fast untill I put a 3.750 stroker crank with lots of my old parts and a new block together.
Your ideas are headed the right direction. Why don't you run some simulations with milder cams like this one I own.
int 8 52
ext 55 11 @.050
.622/.610
or this off of a cam card
int 8 48
exh 51 7
.565/.571
Crane makes an even milder street solid roller with 232/240 mid to high .500 lift. Off the top of my head it was something like
int 9 43
exh 57 3
[Modified by gkull, 4:46 PM 3/30/2004]
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Is this 350 streetable? (71coupe)
This is very streetable with just a few more cubes and bigger Dart heads. All the books say that running higher ratio rocker arms ands a couple of degrees of duration. So DD2000 charts would feasably even be skewed higher. I do know that it is still really pulling hard at 7500 when my rev limiter starts causing misfiring.
[Modified by gkull, 10:41 PM 3/30/2004]
[Modified by gkull, 10:41 PM 3/30/2004]
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Re: Is this 350 streetable? (gkull)
Is that the specs on your current motor? That thing must sound killer. The flow #'s are from Dart's website. I was thinking of using custom pistons for the higher c/r using 64cc chamber heads. I have most of the pieces so building this motor wont break the bank. The CNC 227 heads are very cool, but mucho $. How accurate is the Vol Eff #'s in Dyno 2000? Some of the cams come up with over 100% Eff. Don't you need a blower to get those numbers? Also, how important are the IMEP,FMEP,& BMEP pressures?
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Is this 350 streetable? (71coupe)
Yes, this is my current motor. I use crutches like 4.11 rearend and 3500 stall to help it go on the streets.
I tried to find a site defining the IMEP,FMEP,& BMEP pressures. You need to get a motor book they all deal with how efficently a motor is using the gas pouring through the motor.
Race motors with high compression with properly tuned intake/cam/headers can exceed over 100% cylinder filling over a very narrow rpm range.
I tried to find a site defining the IMEP,FMEP,& BMEP pressures. You need to get a motor book they all deal with how efficently a motor is using the gas pouring through the motor.
Race motors with high compression with properly tuned intake/cam/headers can exceed over 100% cylinder filling over a very narrow rpm range.
