Chevy Impala SS Forum banner

1 - 8 of 8 Posts

·
Registered
Joined
·
233 Posts
Discussion Starter · #1 ·
I have 10309 crane springs and retainers ,373 eaton posi,spintecs,cai and pcm4less tune and was wondering if this would be the best cam for me I'm looking for a good low to mid range cam and heard 227 is the best
Will I need new springs? A new tune?
It's my first cam swap so I'm new to it
 

·
Registered
Joined
·
7,024 Posts

·
Premium Member
Joined
·
20,353 Posts
I have 10309 crane springs.......and was wondering if this would be the best cam for me......and heard 227 is the best
Will I need new springs? A new tune?.......
The 10309 Springs are good enough.....but it may be time for a new set.

If you can find them.....great. If not, then you'll need a comparable set.

And I'd get a fresh tune for the cam, too.

KW
 

·
Registered
Joined
·
8,689 Posts
the 10309 spring kit iwill work very well with the 227 cam...assumeing you don't have 100k miles on the springs

you will need to reprogram the PCM to get optimum performance from it. Also may have some idle issues if you don't but you can certainly "drive" the car before the tune if you need to

I am doing a 227/10309 iron head 355.....more of a "retirement" motor if the 383 ever dies.
 

·
Registered
Joined
·
233 Posts
Discussion Starter · #5 ·
the 10309 spring kit iwill work very well with the 227 cam...assumeing you don't have 100k miles on the springs

you will need to reprogram the PCM to get optimum performance from it. Also may have some idle issues if you don't but you can certainly "drive" the car before the tune if you need to

I am doing a 227/10309 iron head 355.....more of a "retirement" motor if the 383 ever dies.


Thank you this is exactly the info I was looking for
 

·
Premium Member
Joined
·
8,454 Posts
Get rid of the 309 springs. No good with the 227 cam and 1.6 rockers.
They work great for the stock cam with 1.5 rockers, not the 227.

Also, if you're using them with iron heads, they will pull the push in
rocker studs out.

The intake or exhaust side (sorry, don't remember which one) will pound
the sh*t out of your rockers.

Go with the Patriot springs and screw in studs.
 

·
Registered
Joined
·
8,689 Posts
^^^

Lance brings up a good point

with 1:6 RR the exhaust lift with 'stock" iron head the studs "may" start to lift with the 227. With that said people have run the 227 with stock iron heads without issue with 1.5 RR.

My assumption was you were having your iron heads machined for screw in studs

the Crane spring kit will work fine as other springs like the Patriots. Note that "most" alternate spring selections require a installed height of 1.800" vs the stock 1.75" so machineing down the spring pockets is what you would want to do if going with a 1.800" installed spring.

Heads need to be removed to do the machine work on screw in studs and spring pockets.
 

·
Registered
Joined
·
3,271 Posts
The Pressed in Studs will work just fine.

However, recommend that
IF you have the Heads off
is to fortify with Screw in Studs
AND
Install new Valve Guides
(have not seen a set of Irons that do not need new Guides)
and
Machine for Dual Valve Springs and Retainer kit
(I am a advocate of Howards ElectroPolished Drop in Springs)
and
machine and install performance Valve Seals
and
add 2.02/1.6 valves
and
Clean up Bowl with some porting to match new valves.

You will not be disappointed and the Howard Springs will handle any Performance cam.



Dan
 
1 - 8 of 8 Posts
Top