1970-71 427 454 512 4 bolt Short Block
 

Selling a used 4 bolt main 512 short block that just came out of storage since the 80's. The casting number is 3963512 dated H2570. It is bored what looks fresh .030 over with 7-Manley #5600 pistons and 1-TRW L2300 piston. They appear to be 11-1 I think by the dome size. I took photos of the tops. Must of had issues at some time to switch the piston. There is no cam in it but has new cam bearings. The crank is a 6223 I have not pulled a cap to see if its turned. The lifter valley area has been smoother off. There is no stamping on the pad. Price is 2100 plus shipping. I'll put it inside a GM engine crate and deliver it to a terminal buyer pays shipping. Call or email Larry 520-349-2337

Also have a set of 840 heads that were for this.

Re: 1970-71 427 454 512 4 bolt Short Block
 

Looks like 11:1 slugs ...

Re: 1970-71 427 454 512 4 bolt Short Block
 

Thanks I modified the listing.

Re: 1970-71 427 454 512 4 bolt Short Block
 

TRW LF2300 is a 10.25:1 w/closed chamber heads. Can't verify the Manleys, but they look to be the same.
Two guys commented that with L2300 .030 & using 104 cc and 109.4 cc heads, their respective compression ratio was 9.60 & 9.40 (estimated).

Re: 1970-71 427 454 512 4 bolt Short Block
 

3/8"rod bolts? Dimple?

Re: 1970-71 427 454 512 4 bolt Short Block
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bbbentley</div><div class="ubbcode-body">TRW LF2300 is a 10.25:1 w/closed chamber heads. Can't verify the Manleys, but they look to be the same.
Two guys commented that with L2300 .030 &amp; using 104 cc and 109.4 cc heads, their respective compression ratio was 9.60 &amp; 9.40 (estimated).</div></div>

Agree -- I didn't look like there was enough dome for a 12.5:1 ... still a nice piece ... TAZ

Re: 1970-71 427 454 512 4 bolt Short Block
 

They are the 3/8 rods.

Re: 1970-71 427 454 512 4 bolt Short Block
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: lbnaz</div><div class="ubbcode-body">They are the 3/8 rods. </div></div>

should be dimple rods ?

Re: 1970-71 427 454 512 4 bolt Short Block
 

Got a call about the heads. They have a light port job, complete heads dated F188 and A128. Will sell short block and heads for 2500 plus shipping. Larry 520-349-2337

Re: 1970-71 427 454 512 4 bolt Short Block
 

Price dropped to 2250 obo plus shipping for short block and 840 heads. I'll crate up and deliver to terminal buyer pays shipping. Larry