Another 308 post

[Castiron355]

[IMG]http://i1376.photobucket.com/albums/ah7/riellypethybridge1/Mobile%20Uploads/AD430649-4C1D-4149-9177-D296E9E91712_zps5u3o8uni.jpg[/IMG] This is my manifold can anyone tell me what it is thinking pro comp

Yeah mine seems okay. Put a 1 inch phenolic spacer on it though. They cook your carb. I also radiused all the top edges leading into the runners. The stock casting leaves a real sharp edge.

[rielly1978hzwagon]

Any photos of your set up mate ? Or of the manifold once you done the radiusing ?

[rielly1978hzwagon]

[IMG]http://i1376.photobucket.com/albums/ah7/riellypethybridge1/Mobile%20Uploads/816AEAE8-832B-4A89-A109-30CF56428D05_zpskj4mkkgy.jpg[/IMG] These are my heads all cleaned up and blasted never got around to porting them yesterday, beer got in the road haha so ill probly get a chance today

[Castiron355]

Any photos of your set up mate ? Or of the manifold once you done the radiusing ?

Nah I did a before photo, but not an after. Lol

[Castiron355]

[IMG]https://uploads.tapatalk-cdn.com/20190121/c40a702bcae6bcf25d88fefd803910a7.jpg[/IMG]

That was with a lynx square to spreadbore flipped upside down. Then fitted 1 inch phenolic on top of that.


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[GtoGeoff]

For those who may not know it, the 253-308 rocker arms are the same as the Pontiac V8. This broadens the choice to steel [ Comp Cams ] or Crower s/steel.

[Castiron355]

They are the same ratio. But 7/16 studs.no biggy really.


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[GtoGeoff]

I know the Crowers are made with 3/8" or 7/16" stud holes. Also good to see beehive springs being used.

[Castiron355]

I was looking at the Crow Stainless, which great for the money. Only 7/16 stud though. Luckily my heads came with 7/16. Happier with the Crane rockers though.
Yeah the springs were another “budget” work around. Valve stems, mainly seals are a little too big for dual spring. We’ll see how they go.


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[rielly1978hzwagon]

Nice set up mate looks the works , just gunna throw another spanner in the works, i could have access to a cheap 330 offset ground stroker crank what rods and pistons would i use with this combination ?

[Castiron355]

Don’t quote me on this. But if you haven’t decked the block. Stock height pistons might still be okay.


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[rielly1978hzwagon]

If you dont mind me asking what did it cost you to do your 355 bottom end ? If i get the 330 stroker crank ill still be up for balancing and new rods and pistons?

[rielly1978hzwagon]

And my block has been already decked suit zero deck

[GtoGeoff]

Crow may use the same rockers as PRW. I know of folks using the PRWs finding the roller tip wearing & going out of round.

[rielly1978hzwagon]

And just done a rpm at 60mph calculator online its saying around 3500rpm with 4:44s 😀 thinking i might snap up a set if that sounds right