Crank & Cam
Thread Starter
Heel & Toe
Joined: Jan 2007
Posts: 17
Likes: 0
Crank & Cam
Hi All -
I have a 1969 Corvette 350 w/4spd and 3:70 rears.
My crank got wiped out and now its time for a complete rebuild.
I was going with the Edelbrock 64 cc aluminum Performer RPM Cylinder Heads and full roller rockers with McJacks 1 ¾ block huggers.
My questions are: Which is better a forged steel crank or a cast steel crank and are there any preferences on manufacturers?
Does anybody have the specs for the 1970 LT-1 350 cam? Is there a comparable roller cam with the same specs? Part numbers would be great if that is possible.
Pistons are 10:5. RPM range I run is 1500 – 5000
Thank you for your opinions.
I have a 1969 Corvette 350 w/4spd and 3:70 rears.
My crank got wiped out and now its time for a complete rebuild.
I was going with the Edelbrock 64 cc aluminum Performer RPM Cylinder Heads and full roller rockers with McJacks 1 ¾ block huggers.
My questions are: Which is better a forged steel crank or a cast steel crank and are there any preferences on manufacturers?
Does anybody have the specs for the 1970 LT-1 350 cam? Is there a comparable roller cam with the same specs? Part numbers would be great if that is possible.
Pistons are 10:5. RPM range I run is 1500 – 5000
Thank you for your opinions.
Le Mans Master
Joined: Mar 2004
Posts: 7,477
Likes: 1,495
From: Little Rock AR
Hi All -
I have a 1969 Corvette 350 w/4spd and 3:70 rears.
My crank got wiped out and now its time for a complete rebuild.
I was going with the Edelbrock 64 cc aluminum Performer RPM Cylinder Heads and full roller rockers with McJacks 1 ¾ block huggers.
My questions are: Which is better a forged steel crank or a cast steel crank and are there any preferences on manufacturers?
Does anybody have the specs for the 1970 LT-1 350 cam? Is there a comparable roller cam with the same specs? Part numbers would be great if that is possible.
Pistons are 10:5. RPM range I run is 1500 – 5000
Thank you for your opinions.
I have a 1969 Corvette 350 w/4spd and 3:70 rears.
My crank got wiped out and now its time for a complete rebuild.
I was going with the Edelbrock 64 cc aluminum Performer RPM Cylinder Heads and full roller rockers with McJacks 1 ¾ block huggers.
My questions are: Which is better a forged steel crank or a cast steel crank and are there any preferences on manufacturers?
Does anybody have the specs for the 1970 LT-1 350 cam? Is there a comparable roller cam with the same specs? Part numbers would be great if that is possible.
Pistons are 10:5. RPM range I run is 1500 – 5000
Thank you for your opinions.
If you want to look at aftermarket cams the Comp 270H is good for your setup. I would still stick with the GM 350/350 cam personaly. Don't try to compare these cam specs to any other aftermarket cam. The numbers will look WAY off if you compare the aftermarket lift/duration/overlap to the GM grinds. The "numbers to numbers" comparisons are not valid.
-Mark.
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
I would also consider the "151" cam for a little more torque than the L-82 cam. It is ground on a 110 ICL as opposed to the 114 ICL of the L-82 cam, or install the L-82 4 degrees advanced for some more low end.
Instructor
Joined: Jun 2008
Posts: 132
Likes: 9
From: California
I'm curious about the won't run comment
If you are going to limit the RPM's to 5000 you don't need the LT-1 cam. The LT-1 is a great street solid lifter small block cam but it works best with a 6500 RPM redline. The 350/350 hydarulic cam (also used in the L-82) would work well and have less maintenance as it would not have the LT-1 solid lifters. It would work fine with that compression and combination. Jegs has it under part number 270-WG1170K. Even with that cam you have more RPM capability than you say you need but the next size stock cam down from the 350/350 is the "929" 350/300 HP and will not run with 10.5 compression ratio. If you want to look at aftermarket cams the Comp 270H is good for your setup. I would still stick with the GM 350/350 cam personaly.
Don't try to compare these cam specs to any other aftermarket cam. The numbers will look WAY off if you compare the aftermarket lift/duration/overlap to the GM grinds. The "numbers to numbers" comparisons are not valid.
-Mark.
If you want to look at aftermarket cams the Comp 270H is good for your setup. I would still stick with the GM 350/350 cam personaly. Don't try to compare these cam specs to any other aftermarket cam. The numbers will look WAY off if you compare the aftermarket lift/duration/overlap to the GM grinds. The "numbers to numbers" comparisons are not valid.
-Mark.
Isn't the stock compression on a 300hp 350 10.25 to 1? When you say won't run do you mean there isn't enough duration to lower the dynamic compression ratio with the poor quality gas? The heat dissipation of the aluminum heads he is running would allow more compression with the small cam. I'm just looking for some education here since I have a 300hp 350 that seems to run fine on todays crappy gas with stock iorn heads.
Le Mans Master
Joined: Mar 2004
Posts: 7,477
Likes: 1,495
From: Little Rock AR
Isn't the stock compression on a 300hp 350 10.25 to 1? When you say won't run do you mean there isn't enough duration to lower the dynamic compression ratio with the poor quality gas? The heat dissipation of the aluminum heads he is running would allow more compression with the small cam. I'm just looking for some education here since I have a 300hp 350 that seems to run fine on todays crappy gas with stock iorn heads.
-Mark.
Le Mans Master
Joined: May 2006
Posts: 7,708
Likes: 266
From: indy indiana
you dont need a forged crank for this application. It will offer a bit of insurance tho,just a bit. If you plan on boring the block, there are very good offering in the 383 line up. I agree with the "stay with hyd. lifters" post. you also dont need full roller rockers. Comp cams sell a 1/6 rocker,that is roller tipped.
Last edited by ghoastrider1; Aug 6, 2008 at 07:19 PM.
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
I don't believe the stock compression on a 350/300 is 10.25:1, more like 9.75:1 which is about the maximum a '929 cam will work with.
Since you are only turning 5K, why not look into a 383 rebuild, it costs the same.
Since you are only turning 5K, why not look into a 383 rebuild, it costs the same.
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