76 gmc 350

[jeffery russell]

I'm finally getting to build an mild 350 cause now I have adult money but not alot of it.
I'm boring it .030 over with flat top pistons and a sum 1103 camshaft.
I'm taking the 991 heads and putting 1.94 intake valves in it and keeping the 1.5 exh valves and putting .550 max lift springs on the heads.
a sum-226012 intake with a 1406 edelbrock carb and a hei distributor and a hv oil pump.
also putting a set of long tube headers
I'm thinking of timing it a 2250rpms at 32 degrees. any advice would be taken in consideration.
no I'm not buying new heads right now i gave myself a budget and I'm trying to stick to it.
all parts have been order and im waiting on the machine shop to get my engine back.

 

[Bextreme04]

I'm doing a similar build right now.

Did you check the deck height and quench area for your piston/engine/head combo? I found mine to be really bad with the pistons( 1.55" compression height) giving the stock motor a .035-.038 deck height. I'm having the machine shop deck it .020" and am running sealed power H345DCP30 pistons with a 1.548" compression height. That should give me a .017" deck height and then I'm using a chevrolet performance head gasket that will have a .028" compressed thickness. The standard Fel-Pro gaskets have a .039" compressed thickness, which will give you a stupid big quench area, especially with a standard deck height and cheaper pistons with a lower compression height(most are 1.54").

That combo will give me around 9:1 Static compression and about 8.05:1 dynamic compression with the summit K1102 cam that I'm planning on using. I'm also reusing the stock intake manifold and quadrajet that I rebuilt a year or so ago. I got some refreshed 882 heads locally that I'm doing a mild pocket port and combustion chamber polish on and then sending it. I found that the cost of doing a deck, valve guides, and valve job on the original heads was almost as much as just buying summit iron heads(they are only $700 shipped for a complete set), so I decided to use a refreshed set that someone in a local squarebody group had sitting around from a previous build.

I'll be into it for about $1000-1200, all-in, for the machine work and parts when its done.... It's really just a filler motor for a few months until I'm ready to swap in the 454/4L80E and the complete fuel injection harness/computer

 

[jeffery russell]

The pistons I'm using are these

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