Cam question
#1
Senior Member
Thread Starter
iTrader: (7)
Join Date: Jan 2012
Location: Romney, WV
Posts: 586
Likes: 0
Received 2 Likes
on
1 Post
Car: 89 IROC Z/88 IROC Vert
Engine: 350c.i./305c.i.
Transmission: 700R4/T-56
Axle/Gears: 3.42/4.10
Cam question
Ok guys, here's what i have. I picked up a gm 350 short block for $150. It's a made in mexico 4 bolt main casting # 10066036. It was equipped with a hydraulic flat tappet cam. I also have my stock 89 tpi 305 with a bad wrist pin still installed in my iroc. I wanted to know if i wanted to run a roller cam in the 350 is a retrofit required? I want to run a hot cam but i'm not ready for the huge cost of the retrofit kit. Also, I would welcome some cam suggestions. Flat tappet or roller, depending on what i find out here. Car has mild port work on the tpi and stock iron heads which i'll be re-using. Thanks in advance.
#2
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 35 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I wouldn't bother with roller lifters in a flat tappet block. If you have killer heads and were spinning it to 7500 RPMs, then retrofit roller lifters would be justified. Your money is better spent on a good aftermarket flat tappet cam/lifter set.
Just be sure to use a high-ZDDP oil with flat tappets. http://www.amsoil.com/storefront/zrt.aspx
Just be sure to use a high-ZDDP oil with flat tappets. http://www.amsoil.com/storefront/zrt.aspx
Last edited by five7kid; 03-29-2012 at 02:07 PM. Reason: I missed the part about reusing the TPI heads
#3
Senior Member
Thread Starter
iTrader: (7)
Join Date: Jan 2012
Location: Romney, WV
Posts: 586
Likes: 0
Received 2 Likes
on
1 Post
Car: 89 IROC Z/88 IROC Vert
Engine: 350c.i./305c.i.
Transmission: 700R4/T-56
Axle/Gears: 3.42/4.10
Re: Cam question
I wouldn't bother with roller lifters in a flat tappet block. If you have killer heads and were spinning it to 7500 RPMs, then retrofit roller lifters would be justified. Your money is better spent on a good aftermarket flat tappet cam/lifter set.
Just be sure to use a high-ZDDP oil with flat tappets. http://www.amsoil.com/storefront/zrt.aspx
Just be sure to use a high-ZDDP oil with flat tappets. http://www.amsoil.com/storefront/zrt.aspx
#4
Senior Member
Thread Starter
iTrader: (7)
Join Date: Jan 2012
Location: Romney, WV
Posts: 586
Likes: 0
Received 2 Likes
on
1 Post
Car: 89 IROC Z/88 IROC Vert
Engine: 350c.i./305c.i.
Transmission: 700R4/T-56
Axle/Gears: 3.42/4.10
Re: Cam question
Also, does anyone know how much lift the stock springs are good for and is 114 degrees of lobe seperation to much for my application? I was looking at this.
http://www.summitracing.com/parts/CCA-CL12-268-4/
http://www.summitracing.com/parts/CCA-CL12-268-4/
#5
Senior Member
Thread Starter
iTrader: (7)
Join Date: Jan 2012
Location: Romney, WV
Posts: 586
Likes: 0
Received 2 Likes
on
1 Post
Car: 89 IROC Z/88 IROC Vert
Engine: 350c.i./305c.i.
Transmission: 700R4/T-56
Axle/Gears: 3.42/4.10
Re: Cam question
Also, does anyone know how much lift the stock springs are good for and is 114 degrees of lobe seperation to much for my application? I was looking at this.
http://www.summitracing.com/parts/CCA-CL12-268-4/
http://www.summitracing.com/parts/CCA-CL12-268-4/
Thread
Thread Starter
Forum
Replies
Last Post