350 Chevrolet Question

Dyno · 10-13-2010, 09:45 PM

Did GM make a Chev 350 block (4.00 bore) that had the roller lifters and a mechanical fuel pump boss? If they did, what was the block casting number and what did it come in? Thanks, Dyno

mr.breeze4069 · 10-13-2010, 11:30 PM

Check on 93 -95 truck blocks. Tearing one down now no roller but it does have the mount pads to secure the plate to hold down the lifter stands and has fuel pump boss and its drilled for the fuel pump pushrod.

Alan Roehrich · 10-14-2010, 10:11 AM

I think those are 238 and 880 blocks. You want to find one that has a fuel pump block off plate on it. It is probably true that they are as likely to be TBI truck engines as anything. You may have to trill and tap for the bolts to secure the bracket.

Robert Swartz · 10-14-2010, 07:52 PM

Just tore one down myself recently. It's still setting on the engine stand. Last 3 digits of the block are 638. It had a hydraulic roller cam and the block off plate for the mechanical fuel pump opening. It was a greaseball, but, the bores all checked consistant and the crankshaft was good and smooth. Those were the only two pieces I was concerned about.

Robert Swartz

Alan Roehrich · 10-14-2010, 07:53 PM

Yes, it is 638 and not 238, my mistake, that's what I get for trusting my memory.

Adger Smith · 10-15-2010, 12:19 AM

Not all of the blocks have FP blockoff plates. Some blocks are not drilled all the way into the cam area. I have drilled them to make the FP pushrod fit through to the cam. I have also taken blocks that have the standoffs in the lifter valley and milled them to the correct height and tapped them for the lifter hold down tray. All you have to do is find the correct block.

Dyno · 10-15-2010, 04:13 PM

Thanks for the help! Dyno

10-13-2010, 09:45 PM	#1
Dyno Senior Member Join Date: Dec 2002 Posts: 870 Likes: 922 Liked 605 Times in 177 Posts	350 Chevrolet Question Did GM make a Chev 350 block (4.00 bore) that had the roller lifters and a mechanical fuel pump boss? If they did, what was the block casting number and what did it come in? Thanks, Dyno Last edited by Dyno; 10-13-2010 at 10:32 PM.

10-13-2010, 11:30 PM	#2
mr.breeze4069 Junior Member Join Date: Sep 2009 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: 350 Chevrolet Question Check on 93 -95 truck blocks. Tearing one down now no roller but it does have the mount pads to secure the plate to hold down the lifter stands and has fuel pump boss and its drilled for the fuel pump pushrod.

10-14-2010, 10:11 AM	#3
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,926 Likes: 1,001 Liked 1,050 Times in 277 Posts	Re: 350 Chevrolet Question I think those are 238 and 880 blocks. You want to find one that has a fuel pump block off plate on it. It is probably true that they are as likely to be TBI truck engines as anything. You may have to trill and tap for the bolts to secure the bracket. __________________ Alan Roehrich 212A G/S

10-14-2010, 07:52 PM	#4
Robert Swartz Senior Member Join Date: Aug 2008 Location: Nineveh, Indiana Posts: 512 Likes: 0 Liked 3 Times in 3 Posts	Re: 350 Chevrolet Question Just tore one down myself recently. It's still setting on the engine stand. Last 3 digits of the block are 638. It had a hydraulic roller cam and the block off plate for the mechanical fuel pump opening. It was a greaseball, but, the bores all checked consistant and the crankshaft was good and smooth. Those were the only two pieces I was concerned about. Robert Swartz __________________ Robert Swartz - Swartz & Lane 66 Chevy II Pro 95 Achieva EF/SA, 78 Mustang II U/SA (work in progress) #354 stock

10-14-2010, 07:53 PM	#5
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,926 Likes: 1,001 Liked 1,050 Times in 277 Posts	Re: 350 Chevrolet Question Yes, it is 638 and not 238, my mistake, that's what I get for trusting my memory. __________________ Alan Roehrich 212A G/S

10-15-2010, 12:19 AM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,355 Likes: 437 Liked 680 Times in 264 Posts	Re: 350 Chevrolet Question Not all of the blocks have FP blockoff plates. Some blocks are not drilled all the way into the cam area. I have drilled them to make the FP pushrod fit through to the cam. I have also taken blocks that have the standoffs in the lifter valley and milled them to the correct height and tapped them for the lifter hold down tray. All you have to do is find the correct block. __________________ Adger Smith (Former SS)

10-15-2010, 04:13 PM	#7
Dyno Senior Member Join Date: Dec 2002 Posts: 870 Likes: 922 Liked 605 Times in 177 Posts	Re: 350 Chevrolet Question Thanks for the help! Dyno