[BigBlock1969]

All,

Im planning on putting a 496 in my 69 chevelle. It has a 2 bolt 289 block 454 in it now. Plans are to bore and stroke. My question is if i should hold out for a 4 bolt or just continue with the 2 bolt. I have ordered AFR 305 cnc heads as well as a custom cam from cstraub. Engine will be anywhere from 650-730hp and 600-690 lbs tourqe. Could put a 4 bolt cap conversion on the 2 bolt but is it worth it? Need some good advice. The 289 cast block should be a high nickle block if im not mistaken. Built in 74. Most likely a truck engine. Also came with 781's

 

[Malibu ss 64]

2 bolt will be fine, use ARP studs and have it linehoned.

Marcus

 

[the heckler]

long as you don't go to crazy with the right foot you should be ok. after my last block ('68 4-bolt 427 + .060) cracked I purchased a pre-machined block from wheeler racing in florida. it has just the middle caps converted to 4 bolts - billet using ARP studs (necessity imho). so far no issues....

 

[pauls72]

Not really cap related but I have a 4 bolt '74 289 block that the shop had to put a sleeve in one cylinder. Went .120 over on that one to put the sleeve in and he said it had a good amount of material left. I have heard that these blocks were hosses

 

[Indiansprings]

You should be OK

 

[71454Chevelle]

I have a 2 bolt main, ARP studs and '289 casting block for my 496 with no issues. :yes:
HP is in the 650-675 range and sees 6500+ rpm regularly.

 

[BigBlock1969]

Thats what i needed to hear guys. Thank you!