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355 sbc build... afr 210s?

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29K views 60 replies 32 participants last post by  desoto30  
#1 ·
My current setup is 355 withforged internals 6 inch rods.
Old school pro action iron 180s that have been ported.
I have never been real impressed with the heads.
A solid flat tappet cam with around .610 lift.
The heads have been shaved quite a bit and I'm not sure what the chamber is but I do run race gas.

My plan is to step up to a cnc head.
Looking at the afr 210s because they flow decent for the money.
Going to go with a solid roller cam.
The compression ratio will drop due to the chamber volume.
Probably allow for pump gas.

The old combo went a best of 11.96@114
3200 pounds
4500 stall, foot braked
4.11 gear, 28 inch tire.

My question is can I gain a second in et?

My goal is 10.9x on motor.
Or should I just wait and build a 383 or 406?
Any advice would be appreciated. Thanks

Streetability is not really an issue.
I'm not against high rpm either.
I only want to do this to the 355 because that's what I have.
I like the 210s because they would work on a bigger motor in the future.

Any thoughts?
 
#33 ·
Damn some of you gave gotten some good numbers out of these little 355s

Mine is a pump gas deal
40 over 350
Gmpp 1053 steel crank
Scat 5.7 h- beam rods
Je/srp pistons 2 valve relief flat tops
Edelbrock performer rpm head milled to 54cc ( 20 year old heads ).
Crane hyd roller 232/242@.050 .555/.558 lift 112 lsa
Pro products hurricane manifold
850 q series carb
Msd ignition
10.5:1 compression
Th350 with 3800 stall
Moser 9" with spool and 4.10s
255/60/15 mt drag radial ( 27x10.5x15 )
Car weighs 3200 pounds

My motor runs on pump gas , I've been a best of 11.50 @ 117 on motor and 10.90@125 on a 175 shot. Im hoping those numbers change as I had found some issues with the rear suspension on my car , which I'm currently taking care of. Also had the motor refreshed and found some issues with it as well that where totally my fault when I first assembled it.

Wonder if I could also improve in the head and cam department , but wanted to fix the rear suspension problem first , then see what kind of improvement I made.
 
#36 ·
Damn some of you gave gotten some good numbers out of these little 355s

Mine is a pump gas deal
40 over 350
Gmpp 1053 steel crank
Scat 5.7 h- beam rods
Je/srp pistons 2 valve relief flat tops
Edelbrock performer rpm head milled to 54cc ( 20 year old heads ).
Crane hyd roller 232/242@.050 .555/.558 lift 112 lsa
Pro products hurricane manifold
850 q series carb
Msd ignition
10.5:1 compression
Th350 with 3800 stall
Moser 9" with spool and 4.10s
255/60/15 mt drag radial ( 27x10.5x15 )
Car weighs 3200 pounds

My motor runs on pump gas , I've been a best of 11.50 @ 117 on motor and 10.90@125 on a 175 shot. Im hoping those numbers change as I had found some issues with the rear suspension on my car , which I'm currently taking care of. Also had the motor refreshed and found some issues with it as well that where totally my fault when I first assembled it.

Wonder if I could also improve in the head and cam department , but wanted to fix the rear suspension problem first , then see what kind of improvement I made.

How do you get a 350 to be 10.5:1 compression with 54cc chambered heads? Are you using dished pistons?
Flat tops would be about 11.5:1 w/54cc chambes.
 
#48 ·
My current setup is 355 withforged internals 6 inch rods.
Old school pro action iron 180s that have been ported.
I have never been real impressed with the heads.
A solid flat tappet cam with around .610 lift.
The heads have been shaved quite a bit and I'm not sure what the chamber is but I do run race gas.

My plan is to step up to a cnc head.
Looking at the afr 210s because they flow decent for the money.
Going to go with a solid roller cam.
The compression ratio will drop due to the chamber volume.
Probably allow for pump gas.

The old combo went a best of 11.96@114
3200 pounds
4500 stall, foot braked
4.11 gear, 28 inch tire.

My question is can I gain a second in et?

My goal is 10.9x on motor.
Or should I just wait and build a 383 or 406?
Any advice would be appreciated. Thanks

Streetability is not really an issue.
I'm not against high rpm either.
I only want to do this to the 355 because that's what I have.
I like the 210s because they would work on a bigger motor in the future.

Any thoughts?
My thoughts?, you really want MY THOUGHTS?

HIT THE PHUCKING NEWBIE THREAD! :smt097
 
#57 · (Edited)
I've got AFR 235s on my 370. Didn't change anything else in the engine,
But I did change to a glide from a th350. Same 8" converter stalls at 6500-6600. Truck picked up 2.5 Teths from my old Eldebrock Victor Jr heads. I've got LGM 1.65 shafts on it. Comprestion dropped slightly due to the larger chamber. About 1/2 point.
Cam is
292@.020
262@.050
185@.100
.690 lift on 108.
I know the cam is not optimal but it works for now.
Those heads are what Jermey at AFR suggested. I do plan on building a 414 or larger engine in the near future. I do not believe they are to big for my 370.

I've got off the shelf JE pistons no problems with valve clearance.