69 427 rebuild

[Don W.]

Re: 69 427 rebuild

Is this correct the correct cam kit with lifters, or a different cam?

http://www.summitracing.com/parts/SLP-KC-1093M/

[Joe L.]

Re: 69 427 rebuild

For the KB 360 Pistons; this is the only web hit I can find. Is there another part number or description? Don
http://shop.enginekits.com/osb/itemdetails.cfm?ID=792

Don-----


Try this one:

http://kb-silvolite.com/kb_car/performance.php?action=details&P_id=107

[Don W.]

Re: 69 427 rebuild

Joe...thank you...Don

[Joe R.]

Re: 69 427 rebuild

Is this correct the correct cam kit with lifters, or a different cam?

http://www.summitracing.com/parts/SLP-KC-1093M/

Don,

That looks like the right one to me.

Joe

[Don W.]

Re: 69 427 rebuild

Are there any specific recommendations for the cast iron heads. I have from the post: port and polish; new valves with 3-angle cut, new design valve springs...Don

[John H.]

Re: 69 427 rebuild

Are there any specific recommendations for the cast iron heads. I have from the post: port and polish; new valves with 3-angle cut, new design valve springs...Don

Don -

The traditional full "port and polish" is tedious, expensive, and unnecessary. The most "bang for the buck" lies in cleaning up and blending the bowl below the valves to smooth the sharp transition from the valve seat to the port.

[Don W.]

Re: 69 427 rebuild

Here's a summary...Don

Corvette 427 Engine Rebuild Plan
Oil Pump
Melling M-10775
Summit Racing $120
Cast Iron Heads
Pocket port, port match, chamber relieve, mulitangle valve job. NO POLISHING!
a super 3 angle valve job and port and cc each chamber

Use OE equivalent valves, but open up the exhaust to 1.88" on L-72 heads". Stainless steel valves on the inlet side are total overkill and a waste of money
New head bolts
Pistons
Keith Black KB 360 pistons will produce a compression ratio of about 9.6:1 in your engine. These are what I would consider the ideal pistons for your application.
Summit Racing; set of 8 $320
You could also use KB 176 which would produce a compression ratio of about 10.5:1. I wouldn't use these but you can "roll the dice" and hope you don't end up with detonation problems.
Rods
The best PRODUCTION-type rod still available for big blocks is the GM #10198922. This is the successor to LS-6 rod. It uses 7/16" rod bolts but not the special boron steel variety. The 10198922 also has a somewhat thinner cross-section than the 3969804 but it's close to being as strong and is lighter. It can be improved by the addition of ARP-2000 rod bolts.
GM PART # 10198922 ROD ASMForged Connecting Rod This rugged LS-6/LS-7 connecting rod is forged from 4340 steel, Magnaflux inspected and shotpeened. It has heavy-duty 7/16" diameter rod bolts with knurled shanks (P/N 14096148). This rod is machined for pressed piston pins, and is color coded white.
GM Parts Direct $101/each
Rod bolts
can be improved by the addition of ARP-2000 rod bolts
Summit Racing $150.00
Cam
As far as the camshaft goes use the original camshaft that was installed in your engine. You won't find this part number in ANY GM Parts & Accessories Catalog you can get a very respectable copy as manufactured by Federal Mogul and that's what I recommend you use. This cam was probably the best STREET big block, flat tappet cam EVER devised.
The CS1093M is an exact duplicate of the OE cam. It is built to the GM print.
Sealed Power model CS1093M
Summit Racing: $166 as kit with lifters
Valve Springs
Make sure you replace the valve springs with the second design BB valve spring, which was a dual spring with integral retainer and umbrella seal.
GM part number 12368085
GM Parts Direct $75:
There are 16 of P/N 12368082 high performance hardened steel rocker arms in this kit and they have elongated slots to provide extra clearance with high lift (600") camshafts. These rocker arms can be used in all 454 and 502 crate engines and all performance cylinder heads. They have an H stamped on the rocker arm. For a single replacement rocker arm use P/N 12368082. Technical Notes: These adjustable rocker arms are used on the 502/502 crate engine. They can be used on any Mark IV design engine. They can also be used on any Gen V or VI design engine by using rocker stud kit P/N 12495518. Rocker arm P/N 12368082 includes one rocker arm P/N 3959182, one rocker ball P/N 12338047, and one rocker arm nut P/N 3896648.
Exhaust Manifolds
The OE manifolds are very efficient, but make sure the manifold openings match the head port openings with no overhang on the downstream (manifold) side.

Also, be sure the head pipe fits snugly in the manifold outlet with no overhang.

If there is any significant casting flash in the manifold interior, try to grind it off, but the interior can be difficult to reach with a grinding tool.
Block
I would NEVER align bore a block unless it absolutely positively needed to be align bored. If the engine shows decent bearing wear, it most likely does not need line boring. I can tell you horror stories about such a process as done by most typical machine shops.
Same for decking the block. If the engine did not experience head gasket failure, and the deck is reasonably straight without nicks/scratches, it does NOT need to be decked.
My advice is to rebuild the engine with OE equivalent replacement parts, which are readily available with a target CR not to exceed 10:1. You do this by managing your compression ratio, which starts with measuring deck clearance before the block is disassembled. (see the Summer 2009 Corvette Restorer for a detailed article on this issue.)

If the crank spins freely once the rods/pistons are removed align boring is not necessary. Once it's out, main bearing alignment can be checked with a machinists bar and .0015" feeler gage. Likewise for deck and head flatness.
Magnaflux the crank

Very few OE engines need any kind of align boring or block deck or head surfacing.!

Do not remove metal unless absolutely necessary!

[Joe R.]

Re: 69 427 rebuild

Here's a summary...Don

Corvette 427 Engine Rebuild Plan
Oil Pump
Melling M-10775
Summit Racing $120
Cast Iron Heads
Pocket port, port match, chamber relieve, mulitangle valve job. NO POLISHING!
a super 3 angle valve job and port and cc each chamber

Use OE equivalent valves, but open up the exhaust to 1.88" on L-72 heads". Stainless steel valves on the inlet side are total overkill and a waste of money
New head bolts
Pistons
Keith Black KB 360 pistons will produce a compression ratio of about 9.6:1 in your engine. These are what I would consider the ideal pistons for your application.
Summit Racing; set of 8 $320
You could also use KB 176 which would produce a compression ratio of about 10.5:1. I wouldn't use these but you can "roll the dice" and hope you don't end up with detonation problems.
Rods
The best PRODUCTION-type rod still available for big blocks is the GM #10198922. This is the successor to LS-6 rod. It uses 7/16" rod bolts but not the special boron steel variety. The 10198922 also has a somewhat thinner cross-section than the 3969804 but it's close to being as strong and is lighter. It can be improved by the addition of ARP-2000 rod bolts.
GM PART # 10198922 ROD ASMForged Connecting Rod This rugged LS-6/LS-7 connecting rod is forged from 4340 steel, Magnaflux inspected and shotpeened. It has heavy-duty 7/16" diameter rod bolts with knurled shanks (P/N 14096148). This rod is machined for pressed piston pins, and is color coded white.
GM Parts Direct $101/each
Rod bolts
can be improved by the addition of ARP-2000 rod bolts
Summit Racing $150.00
Cam
As far as the camshaft goes use the original camshaft that was installed in your engine. You won't find this part number in ANY GM Parts & Accessories Catalog you can get a very respectable copy as manufactured by Federal Mogul and that's what I recommend you use. This cam was probably the best STREET big block, flat tappet cam EVER devised.
The CS1093M is an exact duplicate of the OE cam. It is built to the GM print.
Sealed Power model CS1093M
Summit Racing: $166 as kit with lifters
Valve Springs
Make sure you replace the valve springs with the second design BB valve spring, which was a dual spring with integral retainer and umbrella seal.
GM part number 12368085
GM Parts Direct $75:
There are 16 of P/N 12368082 high performance hardened steel rocker arms in this kit and they have elongated slots to provide extra clearance with high lift (600") camshafts. These rocker arms can be used in all 454 and 502 crate engines and all performance cylinder heads. They have an H stamped on the rocker arm. For a single replacement rocker arm use P/N 12368082. Technical Notes: These adjustable rocker arms are used on the 502/502 crate engine. They can be used on any Mark IV design engine. They can also be used on any Gen V or VI design engine by using rocker stud kit P/N 12495518. Rocker arm P/N 12368082 includes one rocker arm P/N 3959182, one rocker ball P/N 12338047, and one rocker arm nut P/N 3896648.
Exhaust Manifolds
The OE manifolds are very efficient, but make sure the manifold openings match the head port openings with no overhang on the downstream (manifold) side.

Also, be sure the head pipe fits snugly in the manifold outlet with no overhang.

If there is any significant casting flash in the manifold interior, try to grind it off, but the interior can be difficult to reach with a grinding tool.
Block
I would NEVER align bore a block unless it absolutely positively needed to be align bored. If the engine shows decent bearing wear, it most likely does not need line boring. I can tell you horror stories about such a process as done by most typical machine shops.
Same for decking the block. If the engine did not experience head gasket failure, and the deck is reasonably straight without nicks/scratches, it does NOT need to be decked.
My advice is to rebuild the engine with OE equivalent replacement parts, which are readily available with a target CR not to exceed 10:1. You do this by managing your compression ratio, which starts with measuring deck clearance before the block is disassembled. (see the Summer 2009 Corvette Restorer for a detailed article on this issue.)

If the crank spins freely once the rods/pistons are removed align boring is not necessary. Once it's out, main bearing alignment can be checked with a machinists bar and .0015" feeler gage. Likewise for deck and head flatness.
Magnaflux the crank

Very few OE engines need any kind of align boring or block deck or head surfacing.!

Do not remove metal unless absolutely necessary!

Don,

I did a quick Google search on your proposed oil pump, without any luck. Anyhow, here's a Sealed Power part for 1/4 of the price for your consideration:

http://www.summitracing.com/parts/SLP-224-4154/

Joe

[Joe R.]

Re: 69 427 rebuild

Don,

What valve springs are you planning to run? I didn't see them in your list, but I might have missed it. I think the ones you want are GM #3970627 valve springs. They are available as a set under GM #12371061.

Joe

[Don W.]

Re: 69 427 rebuild

Joe...here you go for the valve springs...Don

Valve Springs
Make sure you replace the valve springs with the second design BB valve spring, which was a dual spring with integral retainer and umbrella seal.
GM part number 12368085
GM Parts Direct $75:
There are 16 of P/N 12368082 high performance hardened steel rocker arms in this kit and they have elongated slots to provide extra clearance with high lift (600") camshafts. These rocker arms can be used in all 454 and 502 crate engines and all performance cylinder heads. They have an H stamped on the rocker arm. For a single replacement rocker arm use P/N 12368082. Technical Notes: These adjustable rocker arms are used on the 502/502 crate engine. They can be used on any Mark IV design engine. They can also be used on any Gen V or VI design engine by using rocker stud kit P/N 12495518. Rocker arm P/N 12368082 includes one rocker arm P/N 3959182, one rocker ball P/N 12338047, and one rocker arm nut P/N 3896648.

[Joe R.]

Re: 69 427 rebuild

Joe...here you go for the valve springs...Don

Valve Springs
Make sure you replace the valve springs with the second design BB valve spring, which was a dual spring with integral retainer and umbrella seal.
GM part number 12368085
GM Parts Direct $75:
There are 16 of P/N 12368082 high performance hardened steel rocker arms in this kit and they have elongated slots to provide extra clearance with high lift (600") camshafts. These rocker arms can be used in all 454 and 502 crate engines and all performance cylinder heads. They have an H stamped on the rocker arm. For a single replacement rocker arm use P/N 12368082. Technical Notes: These adjustable rocker arms are used on the 502/502 crate engine. They can be used on any Mark IV design engine. They can also be used on any Gen V or VI design engine by using rocker stud kit P/N 12495518. Rocker arm P/N 12368082 includes one rocker arm P/N 3959182, one rocker ball P/N 12338047, and one rocker arm nut P/N 3896648.

Don,

On the GM performance parts web site, I punched in 12371061. Here's what I got:

http://www.karlperformanceparts.com/scripts/prodView.asp?idproduct=732

That's the valve spring I would recommend running.

Then I tried 12368085. Here's the results:

http://www.karlperformanceparts.com/scripts/prodList.asp

That's the rocker arm kit.

Joe

[Don W.]

Re: 69 427 rebuild

Joe...good catch...Don