SBC replacement main caps - Stock

[trmnatr]

Originally Posted by Mike Taylor 3601

Down here in Ky. our hillbilly air isn't real smart it thinks .040 quench is .040 it can't tell how you come up with the .040 quench area,since our hillbilly air isn't real smart I take a sharpie and draw a map on top of piston, so it knows where to go.LOL
Mike Taylor3601

That is a good one lol

I have seen gains, mostly on 400 blocks that are being pushed with standard rings. Just like gas ports are a more effective way of guiding the pressure to the back of the ring. I have seen gains on 400 engines with the piston out of the hole, while still remaining the same quench it did before (although less compression the second way as all the quench is the larger gasket bore)

I won't go have .050" decked off a block to do it, but for a 327 for example with a 6" stroke and 1.385" CH, it will put the piston out some at 9" deck, which is fine for me

Do you agree he shouldn't or should pay this close attention? I think he should....

PS: There is hillbilly air here LOL

[Robert Swartz]

Thanks guys. You answered my question, in spades. There's a lot of very good information there.

Yes, it is an 010 block with the 020 on the inside of the timing cover. It is a 4 bolt main block. I believe, I'm going to put this block back and save it for a bit. I'm now armed with some good information and have an idea of what it will take to make this an acceptable part.

[trmnatr]

Originally Posted by Robert Swartz

Thanks guys. You answered my question, in spades. There's a lot of very good information there.

Yes, it is an 010 block with the 020 on the inside of the timing cover. It is a 4 bolt main block. I believe, I'm going to put this block back and save it for a bit. I'm now armed with some good information and have an idea of what it will take to make this an acceptable part.

The 010/020 I have, is thick enough to go 4.100" safe, IIRC the thrust walls were at least .150" @ 4.1" bore, I'm only 4.061"-4.0615"

Not all of them are though, some were just very good and some were not.

IMO, all this work needs to be done to the blocks regardless which casting number

[trmnatr]

Originally Posted by Robert Swartz

Thanks guys. You answered my question, in spades. There's a lot of very good information there.

Yes, it is an 010 block with the 020 on the inside of the timing cover. It is a 4 bolt main block. I believe, I'm going to put this block back and save it for a bit. I'm now armed with some good information and have an idea of what it will take to make this an acceptable part.

I will give you an example of what an engine did on the track I did, it was our team engine (then he left the team, it was fair for him to leave with a running engine IMO)

1980 Camaro @ 2,850 pounds race weight
Powerglide with 5,200rpm stall
12 bolt with 4.88 gears and Mickey Thompson 32x14 Tires

Engine, GM 509 Block, 4 bolt main (weaker 400) with GM main bolts
- GM block, filled with Hardblok, all mods as suggested below
- GM Nodular Iron Crank
- King Bearings set @ our clearances
- Flat Top Forged Pistons @ .0075" Clearance
- 1/16" 1/16" 3/16" rings
- Our final gone finish we do
- GM 291 Camel Hump Heads, 2.02"/1.6" valves installed, bowl ported due to larger valves, exhaust runners ported to smooth out, chambers are not ported, intake runners are not ported
- Crane Solid Cam 292/300 @.020" 256/264 @.050" .545"/.563" 105° lobe center installed at 102°
- 1.46" Crane Springs 160 seat and 400 open
- Victor Jr.
- 1000 Annular Modified by us

In the Camaro it ran 10.teens @ 131-133mph every pass. Some videos below. When he decided to part out on his own, he took the engine and put it in the Dragster @ 1,750 pounds race weight for some 8.60/8.70 consistent ET's

Here are the videos,,,
Pass


Cold Start


Running Clean